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Connecting the morphological and molecular species concepts to facilitate species identification within the genus Fragilaria (Bacillariophyta)

Kahlert, Maria and Kellye, Marlyn G. and Mann, David G. and Rimet, Frederic and Sato, Shinya and Bouchez, Agnes and Keck, Francois (2019). Connecting the morphological and molecular species concepts to facilitate species identification within the genus Fragilaria (Bacillariophyta). Journal of Phycology. 55 , 948-970
[Journal article]

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Abstract

This paper explores the diversity and taxonomy of species within Fragilaria sensu stricto, an abundant and ecologically important diatom genus, taking advantage of cultured and DNA-barcoded material. The goal is to facilitate the identification of European taxa within this complex, providing a unified view on morphological and molecular diversity. There is a general agreement that the separation of species within the group of Fragilaria is difficult because morphological descriptions of species are not consistent between authorities, ongoing taxonomic revisions have resulted in species described with standards of the late 20th and 21st centuries alongside descriptions based on 19th century (light microscopical) criteria, and because not all diagnostic characters can be seen in all specimens encountered in routine analyses. Consequent confusion could blur potentially important ecological distinctions between species. Our study demonstrated that some species defined on morphological criteria could be confirmed using the rbcL chloroplast gene as a genetic marker, for example, Fragilaria gracilis, Fragilaria tenera, Fragilaria perminuta, and Fragilaria subconstricta. However, even for those species, preliminary identifications based on morphology often differed from identifications based on phylogenetic clustering combined with detailed morphological study. Clades were well-defined by rbcL, but based on morphology, the terminal taxa of these clades did not match the currently described Fragilaria species. To clarify recognition of these taxa, we describe three new species: Fragilaria agnesiae, Fragilaria heatherae, and Fragilaria joachimii.

Authors/Creators:Kahlert, Maria and Kellye, Marlyn G. and Mann, David G. and Rimet, Frederic and Sato, Shinya and Bouchez, Agnes and Keck, Francois
Title:Connecting the morphological and molecular species concepts to facilitate species identification within the genus Fragilaria (Bacillariophyta)
Year of publishing :2019
Volume:55
Page range:948-970
Number of Pages:23
Publisher:Wiley
ISSN:0022-3646
Language:English
Additional Information:Finally published as "Connecting the morphological and molecular species concepts to facilitate species identification within the genus Fragilaria (Bacillariophyta)"
Publication Type:Journal article
Refereed:Yes
Article category:Scientific peer reviewed
Version:Accepted version
Full Text Status:Public
Subjects:(A) Swedish standard research categories 2011 > 1 Natural sciences > 106 Biological Sciences (Medical to be 3 and Agricultural to be 4) > Botany
Keywords:cryptic taxa, DNA barcoding, Fragilaria, integrative taxonomy, rbcL, species delimitation, taxonomy
URN:NBN:urn:nbn:se:slu:epsilon-p-100191
Permanent URL:
http://urn.kb.se/resolve?urn=urn:nbn:se:slu:epsilon-p-100191
Additional ID:
Type of IDID
DOI10.1111/jpy.12886
Web of Science (WoS)000473699300001
ID Code:16336
Faculty:NJ - Fakulteten för naturresurser och jordbruksvetenskap
Department:(NL, NJ) > Dept. of Aquatic Sciences and Assessment
Deposited By: SLUpub Connector
Deposited On:30 Sep 2019 09:44
Metadata Last Modified:22 Aug 2020 22:52

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