Molecular taxonomy confirms morphological classification of deep-sea hydrothermal vent copepods (Dirivultidae) and suggests broad physiological tolerance of species and frequent dispersal along ridges |
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Authors: | Sabine Gollner Diego Fontaneto Pedro Martínez Arbizu |
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Institution: | 1.Deutsches Zentrum für Marine Biodiversit?tsforschung (DZMB), Forschungsinstitut Senckenberg,Wilhelmshaven,Germany;2.Department of Invertebrate Zoology,Swedish Museum of Natural History,Stockholm,Sweden;3.Division of Biology,Imperial College London,Ascot Berkshire,UK |
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Abstract: | Dirivultid copepods are among the most successful organisms at deep-sea hydrothermal vents, as this family includes 50 morphologically
described species. We studied COI diversity of some species in various geographical areas and vent fluid regimes, in order
to gain a better understanding of true species diversity, dispersal strategies, and evolution. DNA taxonomy revealed the same
entities as described with morphological characters. No cryptic species were detected. With the help of COI analyses, it was
possible to identify a new species and match the dimorphic sexes of another species. The geographical distance between vents,
as well as the extreme physico-chemical environment, are thought to affect the gene flow of fauna. We could not detect any
sequence differences within species among different geographical scales (up to 2,000 km) or different vent fluid regimes.
We suggest that Dirivultidae have relatively high gene flow between vents and are able to disperse relatively easy along ridges.
Further, they have a broad physiological tolerance and thus might not have undergone speciation in response to heterogeneity
caused by vent fluids. |
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