Observations on some mangrove-associated algae from the western Pacific (Guam, Chuuk, Kosrae, and Pohnpei)
Observations on some mangrove-associated algae from the western Pacific (Guam, Chuuk, Kosrae, and Pohnpei)
ALGAE. 2013. Sep, 28(3): 241-266
Copyright ©2013, The Korean Society of Phycology
This is an Open Access article distributed under the terms of theCreative Commons Attribution Non-Commercial License ( which permits unrestrictednon-commercial use, distribution, and reproduction in any medium,provided the original work is properly cited.
  • Received : June 09, 2013
  • Accepted : August 09, 2013
  • Published : September 15, 2013
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About the Authors
John A., West
School of Botany, University of Melbourne, Parkville, VIC 3010, Australia
Mitsunobu, Kamiya
Department of Marine Bioscience, Faculty of Biotechnology, Fukui Prefectural University, 1-1 Gakuencho, Obama, Fukui 917-0003, Japan
Susan, Loiseaux de Goër
11 Rue des Moguerou, 29680 Roscoff, France
Ulf, Karsten
Institute of Biological Sciences, University of Rostock, Albert-Einstein-Strasse 3, D-18057 Rostock, Germany
Giuseppe C., Zuccarello
School of Biological Sciences, Victoria University of Wellington, P. O. Box 600, Wellington 6140, New Zealand

The mangrove algal flora of Guam and the Federated States of Micronesia has been poorly explored. We add to our knowledge of this region by observations of collections from these regions. This paper presents new and additional records of: Rhodophyta- Acrochaetium globosum , Colaconema sp., Caulacanthus indicus , Bostrychia moritziana / B. radicans , B. radicosa , B. simpliciuscula , B. kelanensis and B. tenella , Murrayella periclados , and Caloglossa ogasawaraensis ; Chlorophyta- Boodleopsis carolinensis ; and Phaeophyceae- Dictyota adnata , Dictyotopsis propagulifera , and Canistrocarpus cervicornis . Most specimens were cultured to investigate their reproductive biology and many specimens were further identified using molecular data. Low molecular weight carbohydrates (dulcitol, sorbitol, and digeneaside) were identified in samples of B. radicosa and B. simpliciuscula . We also present data on manganese-rich deposits found on B. simpliciuscula and B. tenella in culture, possibly formed by epiphytic bacteria.
The region comprising Guam and the Federated States of Micronesia (including the islands of Chuuk, Kosrae, and Pohnpei) has abundant mangroves. Reports on the marine algae of the region focus mostly on algae from coral reefs (Hodgson and McDermid 2000, McDermid et al. 2002, Lobban and Tsuda 2003, Lobban and N’Yeurt 2006, Tsuda 2006, Tsuda et al. 2012). Consequently, algae associated with mangroves are not well recorded.
The two most well-known red algal genera associated with mangroves are Bostrychia and Caloglossa (King and Puttock 1989, 1994). While the molecular phylogeny of these genera has been well studied, questions still remain into their taxonomy, especially in Bostrychia that contains several polyphyletic or cryptic species (Zuccarello and West 2003, 2006). Records of these algae are sparse in Guam and Micronesia. In Micronesia Tsuda (2006) listed no Bostrychia species, while Lobban and Tsuda (2003) reported B. radicans (based on Zuccarello et al. 1999 b ) and B. tenella . Stictosiphonia kelanensis (Grunow ex Post) R. J. King et C. Puttock (now B. kelanensis Grunow) was recorded by Lobban and Tsuda (2003) and Tsuda (2006) from Guam and Micronesia. This is in contrast with other island regions of the central and south Pacific. Bostrychia moritziana (Sonder ex Kützing) J. Agardh, B. simpliciuscula Harvey ex J. Agardh and B. tenella (J. V. Lamouroux) J. Agardh have been reported from Fiji (South and Skelton 2003), and B. moritziana and B. radicans (Montagne) Montagne from New Caledonia (Zuccarello et al. 2006). West et al. (2008) provided extensive information on B. moritziana , B. radicans , B. simpliciuscula , and B. tenella from Vanuatu. Bostrychia radicosa (Itono) J. A. West, G. C. Zuccarello et M. H. Hommersand, was reported from New Caledonia (West et al. 2006). Recently a new species, B. anomala (Itono) J. A. West, G. C. Zuccarello & M. H. Hommersand, was described from Guam and Kosrae (West et al. 2013). A few records of Caloglossa species have also been reported from the region: C. ogasawaraensis Okamura and C. vieillardii (Kützing) Setchell from Vanuatu (West et al. 2008), C. adnata (Zanardini) De Toni (synonymous with C. bengalensis (G. Martens) King et Puttock) and C. leprieurii (Montagne) G. Martens from Guam and Micronesia (Lobban and Tsuda 2003).
To better explore the biodiversity of these poorly explored algal habitats we investigated the mangrove-associated algae from Guam, Chuuk, Kosrae, and Pohnpei including the collection of live specimens. Most collections were placed in laboratory culture to investigate their reproductive biology (patterns of sexual and asexual reproduction) and molecular phylogeny.
In some of our algal cultures microscopic brown deposits formed on the algae and glass. The preliminary findings on the chemical constitution on these brown deposits are reported here. The low molecular weight carbohydrates (LMWCs) of B. radicosa and B. simpliciuscula from Guam and Micronesia were also analysed to compare with results for these species from other regions.
Methods for collection, isolation and maintenance have been presented previously (West and Zuccarello 1999, West 2005). Collection information on the specimens is given in Table 1 .
- Molecular analyses
DNA was extracted using a Chelex extraction method 242of Goff and Moon (1993). For Caloglossa ogasawaraensis polymerase chain reaction (PCR) conditions followed Kamiya et al. (2011). The sequence data of the three Micronesian strains of C. ogasawaraensis were deposited in the DNA Data Bank of Japan (AB728493-AB728495). For Bostrychia amplification of the RuBisCo spacer procedures and primers were from Zuccarello et al. (1999 a ). Sequences are deposited in Genbank (KF286619-KF286625). Phylogenetic methodologies followed Zuccarello et al. (2012). Maximum likelihood (ML) model for the Caloglossa data set was a TIM2 + I + G and for the Bostrychia data set was a GTR + I + G.
- LMWC chromatographic analyses
The LMWCs dulcitol, sorbitol and digeneaside were qualitatively and quantitatively analyzed in the Bostrychia samples using high-performance liquid chromatography (HPLC) according the extraction and separation methods of Karsten et al. (1991, 2005).
- Elemental scan analyses
In some cultures microscopic brown deposits were observed on the algae and glass surfaces. These specimens (air-dried algae with brown deposits and glass coverslips placed in culture dishes for 4-8 weeks also with brown deposits) were mounted on double sided carbon impregnated conducting tape prior to a conducting film of carbon (approx. 400Å in thickness) being applied to the surface of the samples in a vacuum evaporative coating unit to avoid charging effects. The JEOL JSM35 scanning electron microscope (Jeol Ltd., Tokyo, Japan) is equipped with an EDAX windowless energy dispersive lithium drifted silicon detector capable of semi-quantitative analysis of elements. The image capture system is the “Image Slave” designed specifically for scanning electron microscopy (SEM) operation. Spectra are collected using an accelerating voltage ranging from 15 to 25 kV. The higher kV enables reliable identification of elements present by exciting associated higher energy peaks (K α and K β ). Specimens were viewed in secondary and backscattered electrons and elemental X-ray data collected in specific areas of interest using an area scan mode for an average composition of a given area or spot mode that collects X-rays from approximately 1 μm 2 . A complete explanation for X-ray microanalysis is in Heinrich (1981).
Marine and Freshwater Algae of Micronesia (FSM, Chuuk, Kosrae, Pohnpei) and Guam (GUM) collected February 2006Further information can be obtained from the Master Culture List (
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Marine and Freshwater Algae of Micronesia (FSM, Chuuk, Kosrae, Pohnpei) and Guam (GUM) collected February 2006 Further information can be obtained from the Master Culture List (
In Guam, Chuuk, Kosrae, and Pohnpei we collected a total of 15 taxa. These are presented below taxonomically and in Table 1 .
- Rhodophyta
- Colaconematales, Colaconemataceae.
Colaconema sp.: Isolate 4651 developed a filamentous stoloniferous basal system wrapped around the branches of the host Bostrychia simpliciuscula (4629). Monospores were 10-12 μm in diameter and initially very amoeboid in motion, but later became spherical and showed active gliding. Spores germinated in a bipolar manner with a single erect shoot arising from one pole and from the other pole elongate basal filaments with cylindrical cells that were 5-6 μm wide and 17-18 μm long ( Fig. 1 A). This primary erect system had a fan-shaped appearance with dense multiple alternate branches in which the cells were 8-9 μm wide and 10-12 μm long appearing catenate (i.e., slight constrictions between the cells). The fully grown erect fan shaped shoots reached about 350 μm in length ( Fig. 1 A & E). Subglobose monosporangia about 10-12 μm wide were terminal on branch tips (arrows in Fig. 1 A & D, arrowhead in Fig. 1 B). Erect fan-shaped shoots also arose at variable intervals (5-10 cells apart) from the older elongate basal filaments ( Fig. 1 C & D). These had short clusters of monosporangia ( Fig. 1 D).
Preliminary molecular analysis showed this to be a Colaconema but species designation was not possible (Gary Saunders personal communication).
- Acrochaetiales, Acrochaetiaceae.
Acrochaetium globosum Børgesen: Erect filaments were 7-8 μm in diameter, and cells of main filaments were 17-20 μm long ( Fig. 2 A & B). The single peripheral chloroplast had a centrally projecting pyrenoid ( Fig. 2 B). Branching of erect shoots was usually unilateral ( Fig. 2 AC). Monosporangia were non-pedicellate, solitary and alternate along the filament or in lateral clusters ( Fig. 2 C). Sporangia were slightly elongate, 9-10 μm long and 7-9 μm wide. Free monospores were spherical and about 8 μm in diameter. Germinating monospores enlarged (10- 12 μm) and appeared as empty cells producing a narrow elongate filament before branching ( Fig. 1 D). After 6 days the primary filament was 3 cells long and 8 μm diameter ( Fig. 1 D). At 14 days the sporelings were 7-10 cells long with 1-2 one-celled lateral branches. Monosporangia were the only reproductive structures seen. In laboratory culture the basal system had branched filaments slightly narrower than the erect filaments. Individual plants grew well on glass becoming up to 1.5 mm overall ( Fig. 2 A).
Identification was based on the morphological description of the species in Børgesen (1915), but molecular evidence is clearly needed to verify its identification.
- Gigartinales, Caulacanthaceae.
Caulacanthus indicus Weber-van Bosse: Morphological evidence placed our culture isolate (4625) as C. indicus (Weber-van Bosse 1921). Tentative molecular data also support this determination (Frederic Mineur unpublished observations). Mature male plants were up to 2 cm overall ( Fig. 2 E) with typical main axes about 100 μm in diameter and bearing lateral branches at variable intervals (1-4 mm) ( Fig. 2 E). Laterals often bore continuous encircling spermatangial sori ( Fig. 2 F). Cortical cells were spherical to polygonal along the axes ( Fig. 2 G).
- Ceramiales, Rhodomelaceae.
Bostrychia: Zuccarello and West (2006) merged Stictosiphonia into Bostrychia based on molecular evidence. Tier cell formation (2 tier cells versus 3-5 tier cells per axial cell) was the morphological criterion previously used to distinguish the two genera (King and Puttock 1989). The attachment structures are usually peripherohaptera and cladohaptera. Peripherohaptera are composed of coalescent filaments arising from the tier cells often at branch nodes. These filaments may remain coalescent or diverge as they elongate. Cladohaptera are derived abaxially on lateral branches from the first or second axial cell and its tier cells.
Bostrychia kelanensis Grunow: Bostrychia kelanensis had three key characters: ecorticate, 3 tier cells per axial cell and cladohaptera (King and Puttock 1989, Zuccarello and West 2006). We obtained B. kelanensis from Pohnpei, Chuuk, and Guam ( Table 1 ), although it probably is present elsewhere in this region. One Chuuk isolate (4635) had a Polysiphonia -type sexual life history. One Guam isolate (4637) was a female in the field and laboratory. The Pohnpei isolate (3000) was a tetrasporophyte and all the tetraspores developed into females. Isolates 3075, 3076, and 4589 from Guam and 4632 from Chuuk were tetrasporophytes that produced either abortive sporangia or viable sporelings with tetrasporangial stichidia and were considered to have an asexual life cycle. Reproductive status of isolates in the field and culture are also shown in Table 1 .
Growth of all phases of isolates was good in culture with typical alternate or unilateral branching. All plants
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Colaconema sp. 4651. (A) Original spore (arrowhead) with basal system shoot and erect shoot bearing fan shaped branches and some terminal sporangia (arrows). (B) Terminal sporangial cluster. Mature sporangium (arrowhead). (C) Habit view of thallus showing elongate branched horizontal filaments with erect flabelliform shoots. (D) Young flabelliform branches with terminal sporangia (arrows) on short laterals. (E) Well-developed mature flabelliform erect shoot separated from horizontal filament. Scale bars represent: A-E, 10 μm
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Acrochaetium globosum 4626 (A-D) and Caulacanthus indicus 4625 (E-G). (A) Mature thallus with basal system and erect shoots usually bearing unilateral branches and sporangia. (B) Cells showing single parietal chloroplast with a centrally projecting pyrenoid. (C) Small clusters of sporangia (8 μm diam. × 12 μm long) borne on short unilateral branches. (D) Six-day-old sporelings, 3 cells long with empty spores at base. (E) Habit showing the horizontal stolons and short erect shoots. (F) Erect shoot apex with single apical cell, spermatangial sorus surrounding the branch. (G) Small polygonal cortical cells of mature branch. Scale bars represent: A, 80 μm; B & C, 40 μm; D, 10 μm; E, 1 mm; F & G, 50 μm.
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Bostrychia kelanensis 3075 (A-C), 4589 (D), and 4632 (E-G). (A) Habit of non-reproductive tetrasporophyte with alternate lateral branching and an attachment disc (arrow). (B) Multiple new shoots arising from cladohaptera attachment disc. (C) Microwave-treated branch showing 3-tier cells per pericentral cell. (D) Male gametophyte with continuous spermatangial sorus on upper branches. (E) Female gametophyte with short lateral branches bearing whorls of procarps. Spermatium attached to tip of carpogonium (arrow). (F) Tetrasporangial stichidia. (G) Tetraspore germlings with an initial single rhizoid developing into multiple branched rhizoids. Scale bars represent: A, 2 mm; B, 100 μm; C, 50 μm; D, 75 μm; E, 85 μm; F, 120 μm; G, 60 μm.
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Maximum-likelihood phylogeny of the RuBisCo spacer data of select Bostrychia moritziana / B. radicans isolates. Seven lineages marked (after Zuccarello and West 2003). Isolates from Micronesia (FSM) found in lineages 2, 6, and 7. * indicates PP values ≥0.95 and maximum likelihood bootstrap (ML BP) values ≥95%. Otherwise values presented as PP/ML BP.
grew to 2-3 cm overall and only occasionally producing cladohaptera ( Fig. 3 A & B). Three tier cells were produced per axial cell in all stages ( Fig. 3 C). Males of isolate 4589 produced compoundly branched spermatangial stichidia, 70-75 μm wide, along the upper shoots ( Fig. 3 D). The female shoots of 4632 were 85-100 μm diameter. Branching was usually alternate at 0.5-1 mm intervals ( Fig. 3 A). Procarps were borne in irregular whorls along upper shoots and laterals ( Fig. 3 E) with trichogynes up to 220 μm long and about 8 μm wide.
Tetrasporangial stichidia of 4632 were variable in length and had irregular numbers of tetrasporangia ( Fig. 3 F). Sporelings were about 60-70 μm wide reaching about 0.5-1.0 mm in length before branching ( Fig. 3 G). As sporelings grew their bases produced numerous coherent, branched, and uniseriate rhizoids ( Fig. 3 G).
Bostrychia moritziana / B. radicans species complex: This species complex is comprised of seven molecular lineages (Zuccarello and West 2003, 2006, Zuccarello et al. 2006). These genetic lineages are not reproductively inter-compatible (Zuccarello and West 1995, 1997, Zuccarello et al. 1999 b , 2011). Morphologically B. moritziana has been primarily distinguished by abundant compound monosiphonous lateral branches, whereas B. radicans had mostly polysiphonous laterals. Both ‘species’ produce cladohaptera from the basal cell of the lateral branches. In Micronesia isolates from three lineages (2, 6, 7) are present ( Fig. 4 ).
B. moritziana / B. radicans was especially common ( Table 1 ). A Kosrae isolate of lineage 2 (4607) and others formed typical polysiphonous shoots with some monosiphonous laterals in culture ( Fig. 5 A & B). A Polysiphonia -type sexual life history is evident in 4607 and other strains ( Table 1 ). Mature tetrasporophytes were up to 2-3 cm long with tetrasporangial stichidia variable in abundance ( Fig. 5 B).
Males had lateral branches with single spermatangial stichidia ( Fig. 5 C), or some had compound-branched lateral stichidia. Females bore procarps in series along the apices of polysiphonous lateral branches ( Fig. 5 D). Selffertilization was typical in culture with many spermatia attaching to trichogynes ( Fig. 5 D, arrow in center) and well developed cystocarps ( Fig. 5 D) releasing carpospores that germinated to form tetrasporophytes.
Cladohaptera were typical on most isolates in culture, although in 4607 the cladohaptera usually had free rhizoids and new shoot also arising from the tips of the cladohaptera ( Fig. 5 E). We do not know if this occurs only in culture.
Another isolate of lineage 2 (4619) also had typical polysiphonous shoots, monosiphonous secondary laterals and procarps with elongate trichogynes ( Fig. 6 A).
By contrast, isolate 3001, also from lineage 2, has produced for 24 years successive generations of asexual tetrasporophytes with monosiphonous filaments that begin to form short polysiphonous terminal tetrasporangial stichidia ( Fig. 6 B). These stichidia developing from monosiphonous shoots are similar to tetrasporangial stichidia of Bostrychia anomala J. A. West, de Goër and Zuccarello (West et al. 2013), but B. anomala is in a different subclade ( Fig. 4 ) and has a sexual life history.
Another lineage 2 isolate (4591) produced successive generations of branched monosiphonous filaments bearing terminal segments with asexual tetrasporangial stichidia ( Fig. 6 C) for seven years. Isolate 4596 from lineage 2 was also primarily monosiphonous, but when reproductive, developed terminal polysiphonous segments with procarps bearing elongate trichogynes (arrows in Fig. 6 D). Isolate 3003 from lineage 6 produced successive polysiphonous generations of asexual tetrasporophytes for 19 years.
Two isolates from lineage 7 were quite different from each other in morphology and reproduction. Isolate 4611 was a polysiphonous tetrasporophyte from which spores produced polysiphonous females, whereas 4631 was primarily monosiphonous, producing polysiphonous shoot tips with tetrasporangial stichidia and spores resulting in successive generations of tetrasporophytes. All these isolates are identical in RuBisCo spacer sequences.
Reproductive patterns of the remaining isolates are shown in Table 1 . Some isolates (e.g., 4597) lacked any form of sporic reproduction, producing new thalli by fragmentation.
Bostrychia radicosa: This species originally was described as Rhodolachne radicosa Itono from Fiji (Itono 1985). Based on morphological evidence, it belongs to the genus Bostrychia . Isolates 4614, 4621, 4627, and 4650 had Polysiphonia -type sexual life histories and 4663 had a tetrasporophyte recycling asexual life history. After one year all the isolates reverted to only vegetative growth. The general habit in culture was long horizontal shoots showing at variable intervals short (1-2 mm), erect branches having slightly recurved tips and sometimes branched once or twice ( Fig. 7 A). The attachment structures were different from peripherohaptera and cladohaptera seen in other Bostrychia species, being one or more individual multicellular uniseriate rhizoids arising from the tier cells at the branch nodes from which one or more erect shoots developed as well ( Fig. 7 B). Each rhizoidal cell was uninucleate and had multiple small plastids ( Fig. 7 C). Tetrasporangial stichidia arose at shoot tips, were up to 300 μm long and usually bear 1-2 tetrasporangia per segment ( Fig. 7 D). Male gametophytes had terminal spermatangial stichidia up to 500 μm long with a recurved tip ( Fig. 7 E). Female gametophytes had procarps with elongate trichogynes along the upper part of a shoot tip ( Fig. 7 F). Mature carposporophytes were approximately 150 μm wide and often arose terminally or subapically ( Fig. 7 F). Carpospore germlings had typical bipolar germination ( Fig. 7 G).
In all isolates the LMWC analyses showed sorbitol and digeneaside, but no dulcitol ( Table 2 ).
Bostrychia simpliciuscula: Based on molecular evidence, Zuccarello and West (2006) merged B. tenuissima R. King et Puttock with B. simpliciucscula . All the Micronesian isolates were from the H3 lineage as were those from northern Australia and Singapore (Zuccarello et al. 1999 a ).
Alternate lateral branches arose at variable intervals of 2-10 axial cells ( Fig. 8 A). Pericentral cells and tier cells arose at the 5th-6th axial cell ( Fig. 8 B). Plants were ecorticate with whorls of 4-7 pericentral cells each having 2 tier cells. Peripherohaptera usually developed at the nodes of branches or without opposite branches ( Fig. 8 C). The lateral branches were polysiphonous or partially monosiphonous in field specimens.
The H3 lineage of B. simpliciucscula was also characterized by the presence of the LMWC’s sorbitol, dulcitol
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Bostrychia moritziana / B. radicans, lineage 2, isolate 4607. (A) Habit of cultured specimen. (B) Tetrasporophyte with sporangial stichidia on a cultured specimen. (C) Male gametophyte with spermatangial stichidia, lower one releasing spermatia. (D) Female gametophytes. On the left are unfertilized procarps with trichogynes (arrows). Center branch has fertilized procarp with spermatia around the trichogyne, 2-week-old cystocarp (arrowhead) developing a pericarp. On the right is branch with two 5-week-old cystocarps showing the darkened carposporangial masses. (E) Cladohaptera often developed differently from most B. moritziana / B. radicans isolates. Individual pericentral cells at tip become dissociated instead of remaining firmly coalesced. The lateral branch tip has a new indeterminate compound branch (arrow). Scale bars represent: A, 5 mm; B, D & E, 80 μm; C, 70 μm.
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Bostrychia moritziana / B. radicans, lineage 2. (A) Isolate 4619. Female with typical polysiphonous branches and procarps (arrows show trichogynes). (B) Isolate 3001. Monosiphonous and polysiphonous branches of asexual tetrasporophyte. (C) Isolate 4591. Asexual tetrasporophyte, apical branching of monosiphonous shoots. Arrowhead indicates transition from mono- to poly-siphonous sector, arrow indicates apical meristem of branched monosiphonous shoot. (D) Isolate 4596. Monosiphonous branches and terminal polysiphonous sectors with procarps (arrows show trichogynes). Scale bars represent: A & B, 75 μm; C & D, 70 μm.
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Bostrychia radicosa. (A) Habit view of isolate 4663 with lax branching of long horizontal filaments. (B) Isolate 4614 node with 3 rhizoids and single erect shoot. (C) Isolate 4614. Rhizoid clearly showing central nucleus and peripheral plastids. (D) Isolate 4621 terminal tetrasporangial stichidium. (E) Isolate 4621 male with terminal spermatangial stichidium and discharged spermatia. (F) Isolate 4621 female with terminal cystocarp and released carpospores. Procarps with trichogynes (arrows) along a lateral branch. (G) Isolate 4621. Carpospore germlings with rhizoid and erect shoot. Scale bars represent: A, 3 mm; B, 42 μm; C, 24 μm; D, 50 μm; E, 40 μm; F & G, 45 μm.
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(A-D) Bostrychia simpliciuscula isolate 4636. (E-H) B. tenella Isolate 4622 (E & F), isolate 4662 (G & H). Isolate 4622 (E & F), isolate 4662 (G & H). (A) Habit showing alternate / bifurcate branching and nodal and intercalary peripherohaptera. (B) Branch apex and subapical branching. Pericentral and tier cells developing at the fifth-sixth axial cell. (C) Nodal and intercalary peripherohaptera both showing coalescent cells from several tier cells becoming free as individual rhizoids elongate. (D) Manganese deposits (arrows) on cell surfaces. (E) Field specimen, heavily corticated and branched, some monosiphonous laterals, large peripherohaptera (arrowhead). (F) Field specimen, narrow, reduced branching, light cortication, no peripherohaptera. (G) Grown on shaker with bright light, showing good cortication, monosiphonous laterals, peripherohaptera (arrows). (H) Small manganese deposits on branches. Scale bars represent: A, 1 mm; B & C, 60 μm; D, 20 μm; E & F, 100 μm; G, 24 μm; H, 18 μm.
and digeneaside (Zuccarello et al. 1999 a , Zuccarello and West 2011). Most isolates from Micronesia had the LMWC’s dulcitol, sorbitol and digeneaside except for isolate 4636 in which digeneaside was not detected ( Table 2 ).
B. simpliciuscula appeared to be one of the more common species in Micronesia. Most field-specimens were not reproductive, but three were tetrasporangiate ( Table 1 ). In culture all the isolates grew well and showed typical morphology ( Fig. 8 A-C) in moderate light (>5 μmol photons m -2 s -1 ) but in lower light (<2 μmol photons m -2 s -1 ) had reduced branching with more peripherohaptera that developed extensive branched rhizoids and new shoots. No isolates in culture showed monosiphonous laterals.
Most isolates remained vegetative in culture. Only two (4595 and 4603) developed tetrasporangial stichidia in which most sporangia were abortive. A few spores were released, and sporelings developed normally, but their final reproductive status was not determined.
SEM elemental analyses were done on microscopic dark brown deposits that frequently occurred on the alga and on glass surfaces in cultures of 4636 ( Fig. 8 D). These dark brown bodies contained manganese, sulphur, magnesium, aluminium, chlorine, potassium, and bromine ( Fig. 9 B). Branch surfaces of B. simpliciuscula 4636 free of brown deposits contained potassium, sulphur, chlorine, magnesium, manganese, and potassium with no detectable aluminium or bromine ( Fig. 9 A).
Bostrychia tenella: Plants usually robust with heavily
Low molecular weight carbohydrates in select species of Bostrychian.t., no trace.
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Low molecular weight carbohydrates in select species of Bostrychia n.t., no trace.
corticated main axes and partly monosiphonous laterals, 5-8 pericentral cells per axial cell, two tier cells per pericentral cell and conspicuous peripherohaptera at some branch nodes. Molecular evidence showed B. tenella is comprised of several well-defined clades (Zuccarello and West 2006).
Field specimens of 4622 showed two distinct morphologies: 1) wide, densely branched with some monosiphonous laterals, heavy cortication and frequent peripherohaptera ( Fig. 8 E), and 2) narrow, reduced branching, light cortication and absence of peripherohaptera ( Fig. 8 F). The more lax branching and reduced cortication may be due to lower light levels from self-shading and sediment cover, but this needs to be investigated further.
A similar pattern of variable morphology was visible in other specimens (e.g., 4662). Plants grown in stationary culture with low light (<3 μmol photons m -2 s -1 ) had reduced and somewhat irregular branching, light cortication and sparse small peripherophaptera. In shaker culture (50-60 rpm) and brighter light (6-8 μmol photons m -2 s -1 ) more frequent branching with heavier cortication, monosiphonous terminal segments, robust peripherohaptera ( Fig. 8 G) and occasional procarps were observed. No other reproduction was seen. The other four isolates were not reproductive in culture.
Microscopic brown deposits similar to those on B. simpliciuscula (4636) were frequent on the branches of B. tenella (4602, 4617, 4662) in stationary culture ( Fig. 8 H).
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Bostrychia simpliciuscula 4636. (A) Scanning electron microscopy (SEM) elemental analyses of algal cell surface. Sulphur and potassium levels very high, manganese is not evident. (B) SEM elemental analyses of dark brown deposit with highest peak of manganese and somewhat lower peaks of sulphur, aluminium, magnesium, potassium, chlorine, and bromine. Note the comparative levels of the different elements on the algal cell surface and the brown deposit. Kα and Kβ designate different energy states for each element.
Analyses showed results similar to those of B. simpliciuscula . Deposits were sparse on plants in shaker culture.
Murrayella periclados (C. Agardh) F. Schmitz: This species is frequently observed in mangroves and coral habitats. We obtained one tetrasporophyte (4606) in Pohnpei that grew well in culture but did not reproduce and this isolate is available as a culture from Kobe University Marine Algal Culture Collection ( ).
- Ceramiales, Delesseriaceae.
Caloglossa ogasawaraensis Okamura: This is the first record for this species in Chuuk, Kosrae, and Pohnpei ( Table 1 ), although it is widespread in the tropics (Zuccarello et al. 2012, Guiry and Guiry 2013).
The blades (0.9-3.0 mm long and 50-250 μm wide) of cultured specimens were usually not constricted at the nodes ( Fig. 10 A). Secondary adventitious branches frequently arose from the marginal cells in the thallus plane, and additional adventitious branches developed from these secondary branches in the same way ( Fig. 10 B). Endogenous branches were not observed. Single rhizoidal filaments, 20-30 μm in diameter and up to 800 μm long, were derived from the nodal pericentral cells or the adjacent pericentral cells immediately above and below the node. Although the number of internodal cell rows was up to six in the field-collected specimens, the cultured specimens tended to be more slender and usually had one or two internodal cell rows ( Fig. 10 B). The axial cells around the node produced one cell row to both sides ( Fig. 10 B).
Reproductive structures were observed in culture. Formation of tetrasporangia took place in acropetal succession and from the lateral pericentral cells toward the margins of the blade ( Fig. 10 C). Sporangial sori (150-800 μm long, 110-150 μm wide) were produced on
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Caloglossa ogasawaraensis. (A) Habit photograph of cultured specimen (4628). (B) Enlarged view of node (4628) showing secondary adventitious branches (arrows) derived from lateral pericentral cells. (C) Branches of tetrasporophyte (4604) bearing long rows of tetrasporangia along the central axis. (D) Branches of male gametophyte (4604) bearing spermatangial sorus. (E) Pseudocystocarp (arrow) on a female (4623). Many trichogynes are visible (arrowheads). (F) Mature cystocarp on a female (4604). Scale bars represent: A, 200 μm; B, C & F, 100 μm; D & E, 50 μm.
both sides of the midrib in the upper part of the blades. Mature tetrasporangia, 40 to 55 μm in diameter, were divided cruciate-decussately or tetrahedrally. Tetraspores germinated into male and female gametophytes, and several females developed carposporophytes. Spermatangial sori were 200-550 μm long and 140-220 μm wide and were found on both sides of the midrib at the upper and middle parts of the blades ( Fig. 10 D). Spermatangial mother cells (3.8-7.5 μm in diameter) cut off three to five spherical spermatangia (2.5-5.0 μm in diameter) toward the outer surface by anticlinal divisions. Many carpogonial branches with elongate trichogynes were produced in a line along a central axis ( Fig. 10 E). Cystocarps were oblate-ovate, 230-350 μm in height, 230- 390 μm in diameter with a narrow ostiole and contained many carposporangia, 50-110 μm in diameter ( Fig. 10 F). Sometimes pseudocystocarps with a pericarp but lacking a gonimoblast occurred in the absence of males ( Fig. 10 E).
In the large subunit (LSU) rRNA gene tree, the entities of C. ogasawaraensis including three FSM strains were resolved as monophyletic with other C. ogasawaraensis from around the world ( Fig. 11 ). The strains from Kosrae (4612) and Chuuk (4628) showed identical LSU sequences and were closely related to the Australian entities. However, there was a 13 bp difference between these two strains and the strain from Pohnpei (4604).
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Maximum-likelihood (ML) phylogeny of Caloglossa inferred from the partial large subunit rRNA gene sequences using Taenioma perpusillum as an outgroup. * ML bootstrap (BP) values ≥95% and posterior probabilities (PP) for Bayesian inference ≥0.95. Otherwise ML BP (>50%; left) and PP (≥0.80; right) are presented for each branch. Strain numbers and localities are shown with species epithets.
- Chlorophyta
- Ulvophyceae, Bryopsidales, Udoteaceae.
Boodleopsis carolinensis Trono: This species was described by Trono (1971) from Palau and was recorded in Micronesia by Lobban and Tsuda (2003) but the specific island is not mentioned. Our field samples formed turfs on various substrates around Pohnpei and Kosrae ( Table 1 ). Isolates 4601 and 4618 grew slowly with reduced branching but did not reproduce and gradually died after 8 months of culture, possibly related to the numerous microscopic brown deposits on the branches. Isolates 4605 and 4624 lacked microscopic brown deposits seen on 4601 and 4618, grew very well and formed long stolons bearing numerous erect dichotomous to polychotomous branches with slightly constricted basal nodes ( Fig. 12 A). Filaments varied from 20 to 32 μm in diameter and contained numerous small (5-7 μm long) elliptical chloroplasts without pyrenoids and colourless amyloplasts lining the large central vacuole ( Fig. 12 B). Sporangia were usually single along the filaments, ovoid (100-130 by 180-200 μm), each with a stalk up to 100 μm long densely packed with amyloplasts and chloroplasts ( Fig. 12 B). Spore discharge was never observed.
- Phaeophyceae
- Dictyotales, Dictyotaceae.
Numerous algal records for Micronesia by Hodgson and McDermid (2000), Lobban and Tsuda (2003), Lobban and N’Yeurt (2006), McDermid et al. (2002) and Tsuda (2006) include various Dictyota species. Specimens listed below were identified by De Clerck et al. (2006) using molecular and morphological evidence.
Canistrocarpus cervicornis (Kützing) De Paula et De Clerck (= Dictyota cervicornis): This species is recorded from Fiji (South and Skelton 2003) and in Micronesia (Lobban and Tsuda 2003) although the specific localities were not indicated. Our specimens were from Nett Point, Pohnpei ( Table 1 ).
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(A) Boodleopsis carolinensis isolate 4605. Habit photo showing dichotomous to polychotomous branching and scattered sporangia. (B) Boodleopsis carolinensis isolate 4624. Sporangium (130 × 200 μm) with partially collapsed stalk and some spores visible around the periphery. Colorless refractive starch containing amyloplasts (arrow) visible in filament. (C) Dictyotopsis propagulifera, Lehn Mesi River, Pohnpei. Habit photo showing typical branching. Scale bars represent: A & C, 1 mm; B, 25 μm.
Dictyota adnata Zanardini: This is the first record for D. adnata from Micronesia (Pohnpei) although it is recorded in Fiji (South and Skelton 2003) and American Samoa (Skelton and South 2004) ( Table 1 ).
Dictyotopsis propagulifera Troll: This is the first record of this monotypic genus from Micronesia ( Table 1 ). The branching of the cultured specimen from Pohnpei is shown ( Fig. 12 C). No reproduction was observed.
This report expands information on species diversity in the islands of Chuuk, Pohnpei, and Kosrae) in Micronesia and neighbouring Guam. While extensive field work has been done in these areas (e.g., Lobban and Tsuda 2003, Tsuda 2006), the small algae associated with mangroves are often overlooked. These algae are common in mangroves around the world and add to the diversity and ecology of these ecosystems. While some of these algae are probably opportunistic epiphytes ( Colaconema sp. and Acrochaetium globosum ) or typical tropical shallow water algae (e.g., Canistrocarpus cervicornis ), and are not specific to mangroves, some are frequently associated with mangroves ( Bostrychia and Caloglossa ).
The taxonomy and molecular phylogeny of Bostrychia , while well studied, is still not completely resolved. Within the morphological species corresponding to B. moritziana and B. radicans there are several evolutionary lineages (seven, plus other species) (Zuccarello and West 2006, West et al. 2013), of these, three lineages are found in this study (lineage 2, 6, 7). These lineage are widespread, with lineage 2 limited to the Indo-Pacific Ocean. Lineage 7 occurs in Florida-USA, Malaysia, Micronesia, New Caledonia, and Saudi Arabia whereas lineage 6 occurs in both the eastern and western Pacific (Zuccarello and West 2003, this paper). This indicates that, at least, historical dispersal is common in these algae, possibly travelling on dislodged mangrove wood or other substrates. It is interesting that one of the more common lineages in Australia and New Caledonia, lineage 1 (Zuccarello and West 2003, Zuccarello et al. 2006) was not found in these collections. Whether it is restricted to the more western Pacific Ocean will need further sampling.
- New Records / Geographic range extensions
Although other Acrochaetium species were recorded by Lobban and Tsuda (2003) this is the first report of A. globosum from Kosrae. Currently it is known only from the Americas (Guiry and Guiry 2013). The species designation is uncertain and awaits molecular definition.
This is the first report of a Colaconema species from Chuuk but definitive molecular data is needed to assign a species name. Colaconema gracile (Børgesen) Ateweberhan et Prud’homme van Reinea and C. hypneae (Børgesen) Santos et Moura are recorded in Micronesia (Guiry and Guiry 2013).
Caulacanthus indicus is not previously recorded in Micronesia but molecular analyses are required to resolve its relationship with Caulacanthus ustulatus , known from Pohnpei (McDermid et al. 2002) and Hawaii (Abbott 1999).
B. moritziana was previously recorded for Micronesia by Zuccarello and West (2006). B. radicans and B. tenella are reported around Micronesia by Lobban and Tsuda (2003). We have added new collections around Chuuk, Kosrae and Pohnpei for the B. moritziana / B. radicans complex.
B. radicosa is recorded in Australia, Fiji, Malaysia, New Caledonia, Thailand, and Madagascar (West et al. 2006) but it was not seen in Vanuatu (West et al. 2008). The new collections from Chuuk and Kosrae extend the range of distribution approximately 3,000 km from the closest previously recorded population in New Caledonia.
Surprisingly, B. simpliciuscula was not recorded previously even though it is quite common around Guam, Chuuk, Kosrae, and Pohnpei. Perhaps it can be confused with B. moritziana / B. radicans . The closest previous record is in Vanuatu (West et al. 2008) about 2,600 km from Kosrae.
Murrayella periclados has not been reported in Micronesia (Tsuda 2006) but Lobban and Tsuda (2003) reported it from Guam. Zuccarello et al. (2002) carried out extensive breeding and molecular analyses with an isolate from Guam and other tropical regions showing clearly that M. periclados is sexually compatible and genetically uniform throughout the tropics. We found one isolate (4606) in Pohnpei, the first record for Micronesia.
C. ogasawaraensis is a new record for Micronesia (Chuuk, Kosrae, Pohnpei) although the closest record is known in Fiji, about 3,500 km from Pohnpei and 4,200 km from Chuuk (South and Skelton 2003). Other Caloglossa species seem widespread in the western Pacific: Australia (King and Puttock 1994, Kamiya et al. 2003, 2004), Guam (Tsuda 2003), Japan (Yoshida 1998), Micronesia (Lobban and Tsuda 2003), New Caledonia (Garrigue and Tsuda 1988, Millar and Prud’homme van Reine 2005), New Zealand (Adams 1994), Papua New Guinea (King 1990), Philippines (Silva et al. 1987), Samoa (Skelton and South 2002, 2007), Solomon Islands (Womersley and Bailey 1970), Tonga (Kamiya et al. 2003), and Vanuatu (West et al. 2008). However, they appear to be absent in French Polynesia (Payri et al. 2000) and Hawaii (Abbott 1999). More extensive collections are necessary.
Dictyota adnata is new to Micronesia (Pohnpei), about 3,500 km from Fiji, the closest previous record (South and Skeleton 2003). Dictyotopsis propagulifera is recorded in Indonesia, Malaysia, Singapore, Australia and Fiji (Guiry and Guiry 2013). The closest known population to Pohnpei is on the Annan River, Queensland, Australia (isolate 4382, Master Culture List, ), a distance of about 2,900 km.
- Culturing
Culturing isolates from the field collections is necessary for most critical observations on growth and reproduction. Even though standard culture conditions are usually satisfactory and we have tested various levels of light, temperature, salinity, water motion and nutrients it is not possible to simulate the daily tidal and salinity patterns of typical mangrove habitats. It is quite possible that these ecological factors affect growth, reproduction and many biochemical patterns.
- Reproductive patterns in Bostrychia species and Caloglossa ogasawaraensis
Thirty-one isolates of B. kelanensis from Australia, Guam, India, Indonesia, Japan, Malaysia, Micronesia, Singapore and Thailand (see Master Culture List). Twenty-three were sexual and eight were asexual. Tetraspores in most sexual tetrasporophytes produced male and female gametophytes but in several tetrasporophytes the tetraspores only developed into females. The tetrasporophytes of asexual isolates recycled through many generations. B. kelanensis is the only species of the genus that exhibited the curious pattern of only females produced by the tetraspores. How do populations without males survive?
For the B. moritziana / B. radicans complex a total of 415 isolates from around the world have been cultured. Approximately 55% had sexual cycles, 28% had asexual recycling of tetrasporophytes, 11% showed only vegetative growth, and 9% were undefined (see Master Culture List). Asexual reproduction of B. moritziana / B. radicans is recorded mostly in northern latitudes (above 37° S) of Australia and along the west coast of New Caledonia whereas sexual reproduction is frequent along the southern coast of Australia, Brazil, El Salvador, Fiji, Guatemala, the east coast of New Caledonia, India, Indonesia, Madagascar, Malaysia, Mexico, New Zealand, Peru, Philippines, South Africa, USA, Vanuatu, and Venezuela (West et al. 1992, West and Zuccarello 1999, Zuccarello et al. 1999 b , 2006, Zuccarello and West 2003, 2011). Asexual and sexual reproduction are intermixed within Fiji, India, Indonesia, Malaysia Madagascar, South Africa, and Vanuatu. From Micronesia ten isolates were asexual, seven were sexual and one was vegetative.
In the six Bostrychia radicosa isolates from other regions reproduction was either of a typical sexual Polysiphonia - type pattern or asexual by recycling of tetrasporophytes although two only showed vegetative growth without reproduction (West et al. 2006). In the five Micronesia isolates four were sexual and one was asexual. The factors controlling these different reproductive patterns are not known.
B. simpliciuscula isolates from Singapore and Japan were investigated by West (1992) and Kamiya et al. (1994) and showed a Polysiphonia -type sexual life history with unisexual or bisexual gametophytes. Of the ninety B. simpliciuscula isolates we investigated forty-six did not reproduce, twenty-seven were sexual with a Polysiphonia -type life history and seventeen were tetrasporophytes with abortive sporangia (see Master Culture List). From Guam and Micronesia eight isolates were non-reproductive and two produced abortive tetrasporangia.
Of the seventy-eight B. tenella isolates obtained around the world, thirty-nine were sexual with a Polysiphonia -type life history, eighteen were tetrasporophytes with abortive sporangia or produced asexual sporelings and 21 only had vegetative growth in culture. Four Micronesia isolates were vegetative and one was a female (see Master Culture List), generally growth was not satisfactory possibly because of the numerous brown deposits.
We have thirty-eight C. ogasawaraensis isolates from around the world. Twenty-one have Polysiphonia -type sexual life history, five have an asexual life history with tetrasporophyte recycling, five are vegetative and seven undefined (see Master Culture List). One isolate from Chuuk is vegetative, one is male and one is female from Kosrae and one from Pohnpei is a tetrasporophyte that produces tetraspores and sporelings that are non-reproductive.
- Low molecular weight carbohydrates
We obtained seven isolates of Bostrychia kelanensis in Guam, Chuuk and Pohnpei but no analyses were done. Other specimens from Australia contained only sorbitol and digeneaside (Karsten et al. 1992, 1995).
B. moritziana / B. radicans specimens from Australia, Brazil, Georgia and Florida (USA), Mexico, Micronesia, Peru, and Venezuela have sorbitol and dulcitol but populations from the North Carolina to Connecticut (USA) have sorbitol and lack dulcitol (Karsten et al. 1992, 1993, 1994, 1995, Pedroche et al. 1995). No analyses were done with the nineteen Micronesian isolates.
B. radicosa isolates from Micronesia have sorbitol and digeneaside but dulcitol was absent ( Table 2 ) whereas isolates from other regions (Australia, Madagascar, Malaysia, New Caledonia, and Thailand) had high levels of digeneaside and low levels of sorbitol and dulcitol (West et al. 2006). At present there are no other characters we recognize that suggest a taxonomic difference between the two groups.
B. simpliciuscula is geographically very widespread and has 3 distinct molecular lineages, H1, H2, and H3 that have different polyol patterns (Karsten et al. 1992, 1995, Zuccarello et al. 1999 a ). All those populations (H2 and H3) north of 34° S have sorbitol, dulcitol and digeneaside and those (H1) south of 34° S have sorbitol and digeneaside. The ten isolates from Guam, Chuuk, Kosrae and Pohnpei all are H3 and contain sorbitol, dulcitiol and digeneaside except 4636 that lacks digeneaside ( Table 2 ).
B. tenella is also very widespread geographically and occupies varied intertidal habitats (mangroves, coral reefs, rocks) even some freshwater and low salinity habitats (e.g., Marbo Caves with freshwater seepage and adjacent to the intertidal zone, Guam). All specimens previously analysed from Australia, Belize, Brazil, Fiji, Indonesia, Madagascar, Panama, Philippines, Puerto Rico, South Africa, Samoa, Thailand, USA, Vanuatua, and Venezuela have both sorbitol and dulcitol (Kremer 1976, Karsten et al. 1992, 1995). The five isolates from Guam and Micronesia were not analysed.
- Manganese deposits
Microscopic dark brown deposits are seen in some cultures from their initial establishment and could not be removed with bacterial antibiotics (Penicillin G, Ciprofloxacin, Rifampin, and Rocephin). These brown deposits are found in greater abundance in cultures that are slow growing. Occasionally they appear to impair the growth of the alga but usually do not. We used electron-scatter SEM microscopy to determine the elemental composition of these brown deposits that have high levels of manganese as well as sulphur, magnesium, aluminium, chlorine, potassium, and bromine in lesser amounts, whereas branch surfaces of B. simpliciuscula 4636 and B. tenella 4662 have high levels of potassium sulphur with low levels of chlorine and magnesium. The levels are clearly much different in the brown deposits than on the algal surfaces. Similar brown structures were evident on isolates of many other red, green, and brown marine algae (West et al. 2010, in this paper see the results on Boodleopsis ). Considering the very low level of manganese as a trace element in seawater these brown deposits are surprising. It is possible that the deposits are associated with manganese-depositing bacteria (Spiro et al. 2010, Geszvain et al. 2012). Manganese deposits have not been previously recorded on marine algae. While this is a preliminary study the high accumulation of manganese (and other metals) warrants further investigation into the causative agent of these deposits.
Manganese deposits were reported on the basal stalks of the freshwater Eustigmatophycean alga Pseudocharaciopsis (Wujek 2012), on loricas of freshwater chrysophyceans (Dunlap et al. 1987), on the lorica of the euglenoid Trachelomonas (Moss and Gibbs 1979).
This research is partially supported by Australian Research Council grants SG0935526 (1994), S19812824 (1998), S19917056 (1999-2001), S0005005 (2000), a grant from the Australian Biological Resources Study (2002-2005) and a grant from the Hermon Slade Foundation (2005-2007). Bill Rainey and Kim O’Connor collected several samples on Pohnpei, Kosrae and Guam. Olivier De Clerck provided much help on the identification of the Dictyotales we collected. Frederic Mineur gave us current information about the status ofCaulacanthus indicus. Gary Saunders provided the molecular evidence for identification of ourColaconemaculture isolate. Pat Kelly, GeoTrack International, did the elemental scan analyses.
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