期刊
MOLECULAR PHYLOGENETICS AND EVOLUTION
卷 140, 期 -, 页码 -出版社
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.ympev.2019.106578
关键词
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资金
- American Museum of Natural History [Theodore Roosevelt Memorial Fund]
- Phi Kappa Phi Honor Society
- Yale Institute for Biospheric Studies
- National Science Foundation Dimensions of Biodiversity [DEB-1136657]
- Frost Professorship Fund at Wellesley College
Epischura (Calanoida: Temoridae) is a Holarctic group of copepods serving important ecological roles, but it is difficult to study because of small range sizes of individual species and widespread distribution of the genus. This genus includes Tertiary relicts, some endemic to single, isolated lakes and can play major roles in unique ecosystems like Lakes Baikal and Tahoe. We present the first molecular and morphological analysis of Epischura that reveals their spatio-temporal evolutionary history. Morphological measurements of mandibles and genetics estimated phylogenetic relationships among all species represented in Epischura, including E. massachusettsensis, whose extinction status is of concern. Analyses used three gene regions for six previously unsequenced species to infer highly-resolved and well-supported phylogenies confirming a split between Siberian and North American species. Previously published age estimates and sequence data from broad taxonomic sampling of calanoid copepods estimated divergence times between the two Epischura groups. Divergence time estimates for Epischura were consistent with earlier molecular clock estimates and late-Miocene cooling events. Additionally, we provide the first taxonomically broad estimates of divergence times within Calanoida. The paraphyletic nature of the genus Epischura (and the family Temoridae) is apparent and requires the resurrection of the genus Epischurella (Smirnov, 1936) to describe the Siberian species.
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