On the genus Crossaster (Echinodermata: Asteroidea) and its distribution.
Several starfish (Echinodermata, Asteroidea) are keystone species of marine ecosystems, but some of the species are difficult to identify using morphological criteria only. The common sunstar, Crossaster papposus (Linnaeus, 1767), is a conspicuous species with a wide circumboreal distribution. In 19...
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ftdoajarticles:oai:doaj.org/article:5c02980c153b44488716aaf9ba86e9e4 2023-05-15T16:29:34+02:00 On the genus Crossaster (Echinodermata: Asteroidea) and its distribution. Halldis Ringvold Truls Moum 2020-01-01T00:00:00Z https://doi.org/10.1371/journal.pone.0227223 https://doaj.org/article/5c02980c153b44488716aaf9ba86e9e4 EN eng Public Library of Science (PLoS) https://doi.org/10.1371/journal.pone.0227223 https://doaj.org/toc/1932-6203 1932-6203 doi:10.1371/journal.pone.0227223 https://doaj.org/article/5c02980c153b44488716aaf9ba86e9e4 PLoS ONE, Vol 15, Iss 1, p e0227223 (2020) Medicine R Science Q article 2020 ftdoajarticles https://doi.org/10.1371/journal.pone.0227223 2022-12-31T10:23:46Z Several starfish (Echinodermata, Asteroidea) are keystone species of marine ecosystems, but some of the species are difficult to identify using morphological criteria only. The common sunstar, Crossaster papposus (Linnaeus, 1767), is a conspicuous species with a wide circumboreal distribution. In 1900, a closely similar species, C. squamatus (Döderlein, 1900) was described from the NE Atlantic Ocean, but subsequent authors have differed in their views on whether this is a valid taxon or rather an ecotype associated with temperature variations. We assessed the differentiating morphological characters of specimens from Norwegian and Greenland waters identified as C. papposus and C. squamatus and compared their distributions in the NE Atlantic as inferred from research cruises. The field data show that C. papposus is found mainly in temperate and shallow waters, whereas C. squamatus resides on the shelf-break in colder, mixed water masses. Intraspecific diversity and interspecific genetic differentiation of the two putative species, and their phylogenetic relationships to several Crossaster congeners worldwide, were explored using mitochondrial and nuclear DNA sequences. The molecular evidence suggests that C. papposus is the more diverse and geographically structured taxon, in line with its wide distribution. C. papposus and C. squamatus are closely related, yet clearly distinct taxa, while C. papposus and C. multispinus H.L. Clark, 1916, the latter from the South Pacific Ocean, are closely related, possibly sister taxa. Article in Journal/Newspaper Greenland Directory of Open Access Journals: DOAJ Articles Greenland Pacific PLOS ONE 15 1 e0227223 |
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English |
topic |
Medicine R Science Q |
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Medicine R Science Q Halldis Ringvold Truls Moum On the genus Crossaster (Echinodermata: Asteroidea) and its distribution. |
topic_facet |
Medicine R Science Q |
description |
Several starfish (Echinodermata, Asteroidea) are keystone species of marine ecosystems, but some of the species are difficult to identify using morphological criteria only. The common sunstar, Crossaster papposus (Linnaeus, 1767), is a conspicuous species with a wide circumboreal distribution. In 1900, a closely similar species, C. squamatus (Döderlein, 1900) was described from the NE Atlantic Ocean, but subsequent authors have differed in their views on whether this is a valid taxon or rather an ecotype associated with temperature variations. We assessed the differentiating morphological characters of specimens from Norwegian and Greenland waters identified as C. papposus and C. squamatus and compared their distributions in the NE Atlantic as inferred from research cruises. The field data show that C. papposus is found mainly in temperate and shallow waters, whereas C. squamatus resides on the shelf-break in colder, mixed water masses. Intraspecific diversity and interspecific genetic differentiation of the two putative species, and their phylogenetic relationships to several Crossaster congeners worldwide, were explored using mitochondrial and nuclear DNA sequences. The molecular evidence suggests that C. papposus is the more diverse and geographically structured taxon, in line with its wide distribution. C. papposus and C. squamatus are closely related, yet clearly distinct taxa, while C. papposus and C. multispinus H.L. Clark, 1916, the latter from the South Pacific Ocean, are closely related, possibly sister taxa. |
format |
Article in Journal/Newspaper |
author |
Halldis Ringvold Truls Moum |
author_facet |
Halldis Ringvold Truls Moum |
author_sort |
Halldis Ringvold |
title |
On the genus Crossaster (Echinodermata: Asteroidea) and its distribution. |
title_short |
On the genus Crossaster (Echinodermata: Asteroidea) and its distribution. |
title_full |
On the genus Crossaster (Echinodermata: Asteroidea) and its distribution. |
title_fullStr |
On the genus Crossaster (Echinodermata: Asteroidea) and its distribution. |
title_full_unstemmed |
On the genus Crossaster (Echinodermata: Asteroidea) and its distribution. |
title_sort |
on the genus crossaster (echinodermata: asteroidea) and its distribution. |
publisher |
Public Library of Science (PLoS) |
publishDate |
2020 |
url |
https://doi.org/10.1371/journal.pone.0227223 https://doaj.org/article/5c02980c153b44488716aaf9ba86e9e4 |
geographic |
Greenland Pacific |
geographic_facet |
Greenland Pacific |
genre |
Greenland |
genre_facet |
Greenland |
op_source |
PLoS ONE, Vol 15, Iss 1, p e0227223 (2020) |
op_relation |
https://doi.org/10.1371/journal.pone.0227223 https://doaj.org/toc/1932-6203 1932-6203 doi:10.1371/journal.pone.0227223 https://doaj.org/article/5c02980c153b44488716aaf9ba86e9e4 |
op_doi |
https://doi.org/10.1371/journal.pone.0227223 |
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PLOS ONE |
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15 |
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1 |
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e0227223 |
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