Marine Biology

, Volume 157, Issue 8, pp 1693–1704 | Cite as

Phylogeography of the Antarctic planktotrophic brittle star Ophionotus victoriae reveals genetic structure inconsistent with early life history

Original Paper

Abstract

In the marine environment, connectivity is influenced by physical oceanography as well as life history and behavioral traits, which in combination with historical events such as geology, physical oceanography, and climate, determine population structure. The Antarctic brittle star Ophionotus victoriae develops via a feeding planktonic larval stage, and therefore has potential for long-distance dispersal throughout its Antarctic/subantarctic range. To evaluate this hypothesis, phylogeography of this ecologically dominant species was elucidated by sequence analysis of two mtDNA genes from individuals collected throughout the Antarctic Peninsula and from two subantarctic islands. Counter to expectations of genetic homogeneity, mtDNA data revealed substantial levels of genetic differentiation as well as diversity. Although there were some genetically homogeneous populations, such as those throughout Bransfield Strait, we found O. victoriae to have significant population structure throughout much of the Antarctic Peninsula, with evidence of potential cryptic speciation between the western and eastern Antarctic Peninsula. Furthermore, Antarctic Peninsula populations were genetically distinct from subantarctic island populations. The low levels of connectivity implied for O. victoriae contrast with those found for many other Antarctic benthic taxa, and suggest a complex interplay between oceanography, recent climate history, and larval ecology.

Supplementary material

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Supplementary material 1 (DOC 148 kb)

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© Springer-Verlag 2010

Authors and Affiliations

  1. 1.Department of Biological SciencesAuburn UniversityAuburnUSA
  2. 2.Department of BiologyAbilene Christian UniversityAbileneUSA

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