Pseudo-nitzschia arctica sp. nov., a new cold-water cryptic Pseudo-nitzschia species within the P. pseudodelicatissima complex
A new nontoxic Pseudo-nitzschia species belonging to the P. pseudodelicatissima complex, P. arctica, was isolated from different areas of the Arctic. The erection of P. arctica is mainly supported by molecular data, since the species shares identical ultrastructure with another species in the comple...
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Online Access: | https://archimer.ifremer.fr/doc/00318/42875/88197.pdf https://doi.org/10.1111/jpy.12395 https://archimer.ifremer.fr/doc/00318/42875/ |
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ftarchimer:oai:archimer.ifremer.fr:42875 2023-05-15T14:51:58+02:00 Pseudo-nitzschia arctica sp. nov., a new cold-water cryptic Pseudo-nitzschia species within the P. pseudodelicatissima complex Percopo, Isabella Ruggiero, Maria Valeria Balzano, Sergio Gourvil, Priscillia Lundholm, Nina Siano, Raffaele Tammilehto, Anna Vaulot, Daniel Sarno, Diana 2016-04 application/pdf https://archimer.ifremer.fr/doc/00318/42875/88197.pdf https://doi.org/10.1111/jpy.12395 https://archimer.ifremer.fr/doc/00318/42875/ eng eng Wiley-blackwell https://archimer.ifremer.fr/doc/00318/42875/88197.pdf doi:10.1111/jpy.12395 https://archimer.ifremer.fr/doc/00318/42875/ 2016 Phycological Society of America info:eu-repo/semantics/openAccess restricted use Journal Of Phycology (0022-3646) (Wiley-blackwell), 2016-04 , Vol. 52 , N. 2 , P. 184-199 Arctic cryptic ITS ITS2 secondary structure LSU rRNA morphology P arctica sp nov phylogeny Pseudo-nitzschia rbcL text Publication info:eu-repo/semantics/article 2016 ftarchimer https://doi.org/10.1111/jpy.12395 2021-09-23T20:27:41Z A new nontoxic Pseudo-nitzschia species belonging to the P. pseudodelicatissima complex, P. arctica, was isolated from different areas of the Arctic. The erection of P. arctica is mainly supported by molecular data, since the species shares identical ultrastructure with another species in the complex, P. fryxelliana, and represents a new case of crypticity within the genus. Despite their morphological similarity, the two species are not closely related in phylogenies based on LSU, ITS and rbcL. Interestingly, P. arctica is phylogenetically most closely related to P. granii and P. subcurvata, from which the species is, however, morphologically different. P. granii and P. subcurvata lack the central larger interspace which is one of the defining features of the P. pseudodelicatissima complex. The close genetic relationship between P. arctica and the two species P. granii and P. subcurvata is demonstrated by analysis of the secondary structure of ITS2 which revealed no compensatory base changes, two hemi-compensatory base changes, and two deletions in P. arctica with respect to the other two species. These findings emphasize that rates of morphological differentiation, molecular evolution and speciation are often incongruent for Pseudo-nitzschia species, resulting in a restricted phylogenetic value for taxonomic characters used to discriminate species. The description of a new cryptic species, widely distributed in the Arctic and potentially representing an endemic component of the Arctic diatom flora, reinforces the idea of the existence of noncosmopolitan Pseudo-nitzschia species and highlights the need for combined morphological and molecular analyses to assess the distributional patterns of phytoplankton species. Article in Journal/Newspaper Arctic Phytoplankton Archimer (Archive Institutionnelle de l'Ifremer - Institut français de recherche pour l'exploitation de la mer) Arctic Journal of Phycology 52 2 184 199 |
institution |
Open Polar |
collection |
Archimer (Archive Institutionnelle de l'Ifremer - Institut français de recherche pour l'exploitation de la mer) |
op_collection_id |
ftarchimer |
language |
English |
topic |
Arctic cryptic ITS ITS2 secondary structure LSU rRNA morphology P arctica sp nov phylogeny Pseudo-nitzschia rbcL |
spellingShingle |
Arctic cryptic ITS ITS2 secondary structure LSU rRNA morphology P arctica sp nov phylogeny Pseudo-nitzschia rbcL Percopo, Isabella Ruggiero, Maria Valeria Balzano, Sergio Gourvil, Priscillia Lundholm, Nina Siano, Raffaele Tammilehto, Anna Vaulot, Daniel Sarno, Diana Pseudo-nitzschia arctica sp. nov., a new cold-water cryptic Pseudo-nitzschia species within the P. pseudodelicatissima complex |
topic_facet |
Arctic cryptic ITS ITS2 secondary structure LSU rRNA morphology P arctica sp nov phylogeny Pseudo-nitzschia rbcL |
description |
A new nontoxic Pseudo-nitzschia species belonging to the P. pseudodelicatissima complex, P. arctica, was isolated from different areas of the Arctic. The erection of P. arctica is mainly supported by molecular data, since the species shares identical ultrastructure with another species in the complex, P. fryxelliana, and represents a new case of crypticity within the genus. Despite their morphological similarity, the two species are not closely related in phylogenies based on LSU, ITS and rbcL. Interestingly, P. arctica is phylogenetically most closely related to P. granii and P. subcurvata, from which the species is, however, morphologically different. P. granii and P. subcurvata lack the central larger interspace which is one of the defining features of the P. pseudodelicatissima complex. The close genetic relationship between P. arctica and the two species P. granii and P. subcurvata is demonstrated by analysis of the secondary structure of ITS2 which revealed no compensatory base changes, two hemi-compensatory base changes, and two deletions in P. arctica with respect to the other two species. These findings emphasize that rates of morphological differentiation, molecular evolution and speciation are often incongruent for Pseudo-nitzschia species, resulting in a restricted phylogenetic value for taxonomic characters used to discriminate species. The description of a new cryptic species, widely distributed in the Arctic and potentially representing an endemic component of the Arctic diatom flora, reinforces the idea of the existence of noncosmopolitan Pseudo-nitzschia species and highlights the need for combined morphological and molecular analyses to assess the distributional patterns of phytoplankton species. |
format |
Article in Journal/Newspaper |
author |
Percopo, Isabella Ruggiero, Maria Valeria Balzano, Sergio Gourvil, Priscillia Lundholm, Nina Siano, Raffaele Tammilehto, Anna Vaulot, Daniel Sarno, Diana |
author_facet |
Percopo, Isabella Ruggiero, Maria Valeria Balzano, Sergio Gourvil, Priscillia Lundholm, Nina Siano, Raffaele Tammilehto, Anna Vaulot, Daniel Sarno, Diana |
author_sort |
Percopo, Isabella |
title |
Pseudo-nitzschia arctica sp. nov., a new cold-water cryptic Pseudo-nitzschia species within the P. pseudodelicatissima complex |
title_short |
Pseudo-nitzschia arctica sp. nov., a new cold-water cryptic Pseudo-nitzschia species within the P. pseudodelicatissima complex |
title_full |
Pseudo-nitzschia arctica sp. nov., a new cold-water cryptic Pseudo-nitzschia species within the P. pseudodelicatissima complex |
title_fullStr |
Pseudo-nitzschia arctica sp. nov., a new cold-water cryptic Pseudo-nitzschia species within the P. pseudodelicatissima complex |
title_full_unstemmed |
Pseudo-nitzschia arctica sp. nov., a new cold-water cryptic Pseudo-nitzschia species within the P. pseudodelicatissima complex |
title_sort |
pseudo-nitzschia arctica sp. nov., a new cold-water cryptic pseudo-nitzschia species within the p. pseudodelicatissima complex |
publisher |
Wiley-blackwell |
publishDate |
2016 |
url |
https://archimer.ifremer.fr/doc/00318/42875/88197.pdf https://doi.org/10.1111/jpy.12395 https://archimer.ifremer.fr/doc/00318/42875/ |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic Phytoplankton |
genre_facet |
Arctic Phytoplankton |
op_source |
Journal Of Phycology (0022-3646) (Wiley-blackwell), 2016-04 , Vol. 52 , N. 2 , P. 184-199 |
op_relation |
https://archimer.ifremer.fr/doc/00318/42875/88197.pdf doi:10.1111/jpy.12395 https://archimer.ifremer.fr/doc/00318/42875/ |
op_rights |
2016 Phycological Society of America info:eu-repo/semantics/openAccess restricted use |
op_doi |
https://doi.org/10.1111/jpy.12395 |
container_title |
Journal of Phycology |
container_volume |
52 |
container_issue |
2 |
container_start_page |
184 |
op_container_end_page |
199 |
_version_ |
1766323097582960640 |