Cryptic mitochondrial lineages in the widespread pycnogonid Colossendeis megalonyx Hoek, 1881 from Antarctic and Subantarctic waters |
| |
Authors: | Kathrin Krabbe Florian Leese Christoph Mayer Ralph Tollrian Christoph Held |
| |
Institution: | 1. Lehrstuhl für Evolutions?kologie und Biodiversit?t der Tiere, Ruhr-University Bochum, Bochum, 44801, Germany 2. Alfred-Wegener-Institut für Polar- und Meeresforschung, Postfach 12 0161, 27515, Bremerhaven, Germany
|
| |
Abstract: | Colossendeis megalonyx Hoek, 1881 is a widespread and abundant pycnogonid in the Southern Ocean which has also been reported from the South Atlantic
and South Pacific Oceans. Its strictly benthic lifestyle is expected to promote genetic differentiation among populations
and ultimately facilitate speciation. On the other hand, the reported eurybathy and unknown larval stages of this species
may allow Colossendeis megalonyx to maintain genetic continuity between isolated shallow-water habitats by active dispersal through the deep sea or by passive
rafting on floating substrates. Thus, it remains unknown whether and to which extent geographically separated populations
of Colossendeis megalonyx maintain gene flow in the Southern Ocean. We sampled 96 specimens of Colossendeis megalonyx from three stations in the Atlantic Sector of the Southern Ocean and one station from the South American continental shelf
(Burdwood Bank). The genetic structure of nominal Colossendeis megalonyx as well as its phylogenetic position within the genus Colossendeis were assessed using a fragment of the cytochrome c oxidase subunit 1 gene. Our data strongly support that nominal Colossendeis megalonyx consists of at least five cryptic and one pseudocryptic mitochondrial lineages, four of which appear to be geographically
restricted. Two lineages occurred at locations separated by more than 1,000 km in the Antarctic, thus indicating high levels
of gene flow or recent colonization. No haplotype sharing across the Polar Frontal Zone was observed. Our results strongly
suggest that cryptic speciation occurred within the genus Colossendeis. The wide biogeographic distribution range of Colossendeis megalonyx and perhaps that of other Antarctic pycnogonids should therefore be regarded with caution. |
| |
Keywords: | |
本文献已被 SpringerLink 等数据库收录! |
|