Conspecificity of two morphologically distinct calcified red algae from the northwest Pacific Ocean: Galaxaura pacifica and G. filamentosa (Galaxauraceae, Rhodophyta)

Shao Lun Liu, Lawrence M. Liao, Wei Lung Wang

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

Background: Members of the calcified red algal genus, Galaxaura, are distributed predominantly in warm temperate, subtropical, and tropical regions worldwide. The capacity of these algae to form calcified thalli could play a critical role in the carbon cycle of these ecosystems. Previous studies have suggested that the reported species diversity of Galaxaura may be exaggerated due to a lack of knowledge regarding external morphological differences between gametophytic and tetrasporophytic plants (or among different life stages) of a single species. Results: To examine this issue, this study collected specimens of two morphologically distinct Galaxaura from Taiwan and the Philippines. These specimens were initially identified as two species (G. pacifica Tanaka and G. filamentosa Chou ex Taylor) based on their morphological features. Our molecular analyses, however, unexpectedly showed that these two specimens shared 100% identical rbcL sequences, indicating that they represented a single species comprising two distinct external morphologies. Furthermore, our extensive observations and molecular analyses on several specimens from different locations in southern Taiwan has revealed that these morphological differences could be due to seasonal variation. Conclusions: This study proposes that G. "filamentosa" from the Philippines could represent the remnants of the lower villous part of older gametophytic plants of G. pacifica after senescence of the upper smooth part of the thallus. As such we propose that these two previously distinct algal species from the northwest Pacific Ocean as a single species, G. pacifica. This study shows that the biodiversity of the calcified red algae Galaxaura could be overestimated without the assistance of molecular tools. Additionally, this study provides insights into the biodiversity and unique biology of the calcified red algae Galaxaura.

Original languageEnglish
Article number1
Pages (from-to)1-19
Number of pages19
JournalBotanical Studies
Volume54
Issue number1
DOIs
Publication statusPublished - 2013 Jul 18

Fingerprint

Galaxaura
Pacific Ocean
Rhodophyta
thallus
algae
Philippines
Taiwan
biodiversity
subtropics
tropics
seasonal variation
Galaxauraceae
species diversity
Biological Sciences
ecosystems

All Science Journal Classification (ASJC) codes

  • Plant Science

Cite this

@article{cf0b835968134548afdefe7076f83fbd,
title = "Conspecificity of two morphologically distinct calcified red algae from the northwest Pacific Ocean: Galaxaura pacifica and G. filamentosa (Galaxauraceae, Rhodophyta)",
abstract = "Background: Members of the calcified red algal genus, Galaxaura, are distributed predominantly in warm temperate, subtropical, and tropical regions worldwide. The capacity of these algae to form calcified thalli could play a critical role in the carbon cycle of these ecosystems. Previous studies have suggested that the reported species diversity of Galaxaura may be exaggerated due to a lack of knowledge regarding external morphological differences between gametophytic and tetrasporophytic plants (or among different life stages) of a single species. Results: To examine this issue, this study collected specimens of two morphologically distinct Galaxaura from Taiwan and the Philippines. These specimens were initially identified as two species (G. pacifica Tanaka and G. filamentosa Chou ex Taylor) based on their morphological features. Our molecular analyses, however, unexpectedly showed that these two specimens shared 100{\%} identical rbcL sequences, indicating that they represented a single species comprising two distinct external morphologies. Furthermore, our extensive observations and molecular analyses on several specimens from different locations in southern Taiwan has revealed that these morphological differences could be due to seasonal variation. Conclusions: This study proposes that G. {"}filamentosa{"} from the Philippines could represent the remnants of the lower villous part of older gametophytic plants of G. pacifica after senescence of the upper smooth part of the thallus. As such we propose that these two previously distinct algal species from the northwest Pacific Ocean as a single species, G. pacifica. This study shows that the biodiversity of the calcified red algae Galaxaura could be overestimated without the assistance of molecular tools. Additionally, this study provides insights into the biodiversity and unique biology of the calcified red algae Galaxaura.",
author = "Liu, {Shao Lun} and Liao, {Lawrence M.} and Wang, {Wei Lung}",
year = "2013",
month = "7",
day = "18",
doi = "10.1186/1999-3110-54-1",
language = "English",
volume = "54",
pages = "1--19",
journal = "Botanical Studies",
issn = "1817-406X",
publisher = "Academia Sinica",
number = "1",

}

Conspecificity of two morphologically distinct calcified red algae from the northwest Pacific Ocean : Galaxaura pacifica and G. filamentosa (Galaxauraceae, Rhodophyta). / Liu, Shao Lun; Liao, Lawrence M.; Wang, Wei Lung.

In: Botanical Studies, Vol. 54, No. 1, 1, 18.07.2013, p. 1-19.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Conspecificity of two morphologically distinct calcified red algae from the northwest Pacific Ocean

T2 - Galaxaura pacifica and G. filamentosa (Galaxauraceae, Rhodophyta)

AU - Liu, Shao Lun

AU - Liao, Lawrence M.

AU - Wang, Wei Lung

PY - 2013/7/18

Y1 - 2013/7/18

N2 - Background: Members of the calcified red algal genus, Galaxaura, are distributed predominantly in warm temperate, subtropical, and tropical regions worldwide. The capacity of these algae to form calcified thalli could play a critical role in the carbon cycle of these ecosystems. Previous studies have suggested that the reported species diversity of Galaxaura may be exaggerated due to a lack of knowledge regarding external morphological differences between gametophytic and tetrasporophytic plants (or among different life stages) of a single species. Results: To examine this issue, this study collected specimens of two morphologically distinct Galaxaura from Taiwan and the Philippines. These specimens were initially identified as two species (G. pacifica Tanaka and G. filamentosa Chou ex Taylor) based on their morphological features. Our molecular analyses, however, unexpectedly showed that these two specimens shared 100% identical rbcL sequences, indicating that they represented a single species comprising two distinct external morphologies. Furthermore, our extensive observations and molecular analyses on several specimens from different locations in southern Taiwan has revealed that these morphological differences could be due to seasonal variation. Conclusions: This study proposes that G. "filamentosa" from the Philippines could represent the remnants of the lower villous part of older gametophytic plants of G. pacifica after senescence of the upper smooth part of the thallus. As such we propose that these two previously distinct algal species from the northwest Pacific Ocean as a single species, G. pacifica. This study shows that the biodiversity of the calcified red algae Galaxaura could be overestimated without the assistance of molecular tools. Additionally, this study provides insights into the biodiversity and unique biology of the calcified red algae Galaxaura.

AB - Background: Members of the calcified red algal genus, Galaxaura, are distributed predominantly in warm temperate, subtropical, and tropical regions worldwide. The capacity of these algae to form calcified thalli could play a critical role in the carbon cycle of these ecosystems. Previous studies have suggested that the reported species diversity of Galaxaura may be exaggerated due to a lack of knowledge regarding external morphological differences between gametophytic and tetrasporophytic plants (or among different life stages) of a single species. Results: To examine this issue, this study collected specimens of two morphologically distinct Galaxaura from Taiwan and the Philippines. These specimens were initially identified as two species (G. pacifica Tanaka and G. filamentosa Chou ex Taylor) based on their morphological features. Our molecular analyses, however, unexpectedly showed that these two specimens shared 100% identical rbcL sequences, indicating that they represented a single species comprising two distinct external morphologies. Furthermore, our extensive observations and molecular analyses on several specimens from different locations in southern Taiwan has revealed that these morphological differences could be due to seasonal variation. Conclusions: This study proposes that G. "filamentosa" from the Philippines could represent the remnants of the lower villous part of older gametophytic plants of G. pacifica after senescence of the upper smooth part of the thallus. As such we propose that these two previously distinct algal species from the northwest Pacific Ocean as a single species, G. pacifica. This study shows that the biodiversity of the calcified red algae Galaxaura could be overestimated without the assistance of molecular tools. Additionally, this study provides insights into the biodiversity and unique biology of the calcified red algae Galaxaura.

UR - http://www.scopus.com/inward/record.url?scp=84886301835&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84886301835&partnerID=8YFLogxK

U2 - 10.1186/1999-3110-54-1

DO - 10.1186/1999-3110-54-1

M3 - Article

AN - SCOPUS:84886301835

VL - 54

SP - 1

EP - 19

JO - Botanical Studies

JF - Botanical Studies

SN - 1817-406X

IS - 1

M1 - 1

ER -