Divergent clades or cryptic species? Mito-nuclear discordance in a Daphnia species complex

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11310%2F17%3A10370022" target="_blank" >RIV/00216208:11310/17:10370022 - isvavai.cz</a>

Result on the web

<a href="http://dx.doi.org/10.1186/s12862-017-1070-4" target="_blank" >http://dx.doi.org/10.1186/s12862-017-1070-4</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1186/s12862-017-1070-4" target="_blank" >10.1186/s12862-017-1070-4</a>

Result language

angličtina

Original language name

Divergent clades or cryptic species? Mito-nuclear discordance in a Daphnia species complex

Original language description

Genetically divergent cryptic species are frequently detected by molecular methods. These discoveries are often a byproduct of molecular barcoding studies in which fragments of a selected marker are used for species identification. Highly divergent mitochondrial lineages and putative cryptic species are even detected in intensively studied animal taxa, such as the crustacean genus Daphnia. Recently, eleven such lineages, exhibiting genetic distances comparable to levels observed among well-defined species, were recorded in the D. longispina species complex, a group that contains several key taxa of freshwater ecosystems. We tested if three of those lineages represent indeed distinct species, by analyzing patterns of variation often nuclear microsatellite markers in six populations. We observed a discordant pattern between mitochondrial and nuclear DNA, as all individuals carrying one of the divergent mitochondrial lineages grouped at the nuclear level with widespread, well-recognized species coexisting at the same localities (Daphnia galeata, D. longispina, and D. cucullata). A likely explanation for this pattern is the introgression of the mitochondrial genome of undescribed taxa into the common species, either in the distant past or after long-distance dispersal. The occurrence of highly divergent but rare mtDNA lineages in the gene pool of widespread species would suggest that hybridization and introgression in the D. longispina species complex is frequent even across large phylogenetic distances, and that discoveries of such distinct clades must be interpreted with caution. However, maintenance of ancient polymorphisms through selection is another plausible alternative that may cause the observed discordance and cannot be entirely excluded.

Czech name

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Czech description

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Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

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OECD FORD branch

10602 - Biology (theoretical, mathematical, thermal, cryobiology, biological rhythm), Evolutionary biology

Project

<a href="/en/project/GPP506%2F10%2FP167" target="_blank" >GPP506/10/P167: Diversity of Old World Daphnia: analysis of cryptic species complexes</a><br>

Continuities

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year

2017

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Name of the periodical

BMC Evolutionary Biology

ISSN

1471-2148

e-ISSN

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Volume of the periodical

17

Issue of the periodical within the volume

November

Country of publishing house

GB - UNITED KINGDOM

Number of pages

9

Pages from-to

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UT code for WoS article

000416061700001

EID of the result in the Scopus database

2-s2.0-85034962339