Title Evolutionary history of Southern Ocean Odontaster sea star species (Odontasteridae, Asteroidea)
Author Janosik, A.M.; Mahon, A.R.; Halanych, K.M.
Author Affil Janosik, A.M., Ashburn University, Department of Biological Sciences, Auburn, AL. Other: University of Notre Dame
Source Polar Biology, 34(4), p.575-586. Publisher: Springer-Verlag, Berlin, Germany. ISSN: 0722-4060
Publication Date Apr. 2011
Notes In English. Supplemental information/data is available in the online version of this article; NSF grants OPP- 0132032, OPP-013203, OPP-0126319, OPP- 9910164, OPP-0338087 and OPP-0338218. 67 refs. GeoRef Acc. No: 309628
Index Terms Southern Ocean; Antarctic Circumpolar Current; behavior; biogeography; biologic evolution; DNA; Echinodermata; ecology; genetics; habitat; Invertebrata; physiology; RNA; taxonomy
Abstract We investigated the recent evolutionary history of demersal sea stars in the genus Odontaster throughout the Western Antarctic waters and on the South American shelf. The mitochondrial 16S ribosomal and cytochrome c oxidase subunit I (COI) genes were sequenced from adult and larval specimens. TCS parsimony network analysis and Bayesian inference were used to examine evolutionary history. Hierarchical AMOVA and mitochondrial DNA diversity statistics were also computed. Additionally, morphological characters were used. In assessing O. validus, we discovered morphological and range descriptions of Odontaster species to be inaccurate and include other Odontaster species in the Southern Ocean. We found O. meridionalis on both sides of the Antarctic circumpolar current (ACC) and Antarctic polar front (APF), whereas O. validus and O. penicillatus do not appear to have permeated these oceanographic features. Additionally, we discovered previously unrecognized species of Odontaster. Subsequent examination revealed diagnostic morphological differences in the number of spinelets on the abactinal and actinal plates. Mitochondrial characterization of Odontaster species suggests their recent history has been influenced by the APF and ACC in different ways. With the exception of O. meridionalis, Odontaster species are restricted to either side of the Drake Passage. O. validus shows genetic connectivity throughout sampled Antarctic waters.
URL http://hdl.handle.net/10.1007/s00300-010-0916-7
Publication Type journal article
Record ID 91417