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Barcoding of ancient lake ostracods (Crustacea) reveals cryptic speciation with extremely low distances


Karanovic, I, Barcoding of ancient lake ostracods (Crustacea) reveals cryptic speciation with extremely low distances, PLoS ONE, 10, (3) Article e0121133. ISSN 1932-6203 (2015) [Refereed Article]


Copyright Statement

Copyright: 2015 Ivana Karanovic. Licensed under Creative Commons Attribution 4.0 International (CC BY 4.0)

DOI: doi:10.1371/journal.pone.0121133


Ostracods are drastically reduced crustaceans, with never more than eight appendages enclosed between two valves, leaving only a limited number of morphological characters for species delineation. Conservative morphology of characters used to define genera, along with high variability of characters used to define species are creating problems in applying a morphospecies concept. A high intraspecific variability in a Lake Biwa (Japan) endemic, Physocypria biwaensis (Okubo, 1990), has been observed previously but was never studied in detail. Two sympatric forms, differing in pigmentation and size, suggest a presence of reproductive isolation. The aim of this study is to employ molecular and morphometric tools to aid in species delineation within P. biwaensis complex and reconstruct their phylogenetic relationships. A fragment of the mtCOI gene was amplified from 30 specimens, and an additional 37 specimens were studied for morphological characters. Resulting phylogenies showed that each morphologically distinct form is associated with a distinct phylogenetic group based on mtDNA. The average pairwise distance is very low (5%), indicating a recent divergence time. I speculate that there is a possibility that one of them originated in the lake, while the other probably colonized it afterwards. This seems to be supported with an apparent niche partitioning at different depths. In spite of the fact that traditionally used sexual characters are highly variable in these two species, the morphometric analysis of shell and soft part related characters clearly delineates them and suggests that such characters may be useful for future detection of seemingly cryptic ostracod species.

Item Details

Item Type:Refereed Article
Keywords:COI, Lake Biwa, morphometry, Ostracoda, Physocypria biwaensis
Research Division:Biological Sciences
Research Group:Evolutionary biology
Research Field:Animal systematics and taxonomy
Objective Division:Environmental Management
Objective Group:Other environmental management
Objective Field:Other environmental management not elsewhere classified
UTAS Author:Karanovic, I (Professor Ivana Karanovic)
ID Code:105952
Year Published:2015
Web of Science® Times Cited:14
Deposited By:IMAS Research and Education Centre
Deposited On:2016-01-21
Last Modified:2018-03-19
Downloads:241 View Download Statistics

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