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Barcoding of ancient lake ostracods (Crustacea) reveals cryptic speciation with extremely low distances
Citation
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]
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Copyright Statement
Copyright: © 2015 Ivana Karanovic. Licensed under Creative Commons Attribution 4.0 International (CC BY 4.0) http://creativecommons.org/licenses/by/4.0/
DOI: doi:10.1371/journal.pone.0121133
Abstract
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: | Environment |
| Objective Group: | Flora, Fauna and Biodiversity |
| Objective Field: | Documentation of Undescribed Flora and Fauna |
| Author: | Karanovic, I (Professor Ivana Karanovic) |
| ID Code: | 105952 |
| Year Published: | 2015 |
| Web of Science® Times Cited: | 8 |
| Deposited By: | IMAS Research and Education Centre |
| Deposited On: | 2016-01-21 |
| Last Modified: | 2016-04-27 |
| Downloads: | 146 View Download Statistics |
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