Pseudo‐nitzschia arctica sp. nov., a new cold‐water cryptic Pseudo‐nitzschia species within the P. pseudodelicatissima complex. Issue 2 (8th March 2016)
- Record Type:
- Journal Article
- Title:
- Pseudo‐nitzschia arctica sp. nov., a new cold‐water cryptic Pseudo‐nitzschia species within the P. pseudodelicatissima complex. Issue 2 (8th March 2016)
- Main Title:
- Pseudo‐nitzschia arctica sp. nov., a new cold‐water cryptic Pseudo‐nitzschia species within the P. pseudodelicatissima complex
- Authors:
- Percopo, Isabella
Ruggiero, Maria Valeria
Balzano, Sergio
Gourvil, Priscillia
Lundholm, Nina
Siano, Raffaele
Tammilehto, Anna
Vaulot, Daniel
Sarno, Diana - Editors:
- Mock, T.
- Abstract:
- Abstract : 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 rbc L. 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 endemicAbstract : 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 rbc L. 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. … (more)
- Is Part Of:
- Journal of phycology. Volume 52:Issue 2(2016:Apr.)
- Journal:
- Journal of phycology
- Issue:
- Volume 52:Issue 2(2016:Apr.)
- Issue Display:
- Volume 52, Issue 2 (2016)
- Year:
- 2016
- Volume:
- 52
- Issue:
- 2
- Issue Sort Value:
- 2016-0052-0002-0000
- Page Start:
- 184
- Page End:
- 199
- Publication Date:
- 2016-03-08
- Subjects:
- Arctic, cryptic, ITS -- ITS2 secondary structure -- LSU rRNA -- morphology -- P. arctica sp. nov. -- phylogeny -- Pseudo‐nitzschia -- rbcL
Algae -- Periodicals
579.8 - Journal URLs:
- http://onlinelibrary.wiley.com/journal/10.1111/(ISSN)1529-8817 ↗
http://onlinelibrary.wiley.com/ ↗ - DOI:
- 10.1111/jpy.12395 ↗
- Languages:
- English
- ISSNs:
- 0022-3646
- Deposit Type:
- Legaldeposit
- View Content:
- Available online (eLD content is only available in our Reading Rooms) ↗
- Physical Locations:
- British Library DSC - 5035.500000
British Library DSC - BLDSS-3PM
British Library STI - ELD Digital store - Ingest File:
- 2774.xml