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Strong population genetic structure in a broadcast-spawning Antarctic marine invertebrate

Hoffman, Joseph I.; Peck, Lloyd S.; Linse, Katrin; Clarke, Andrew. 2011 Strong population genetic structure in a broadcast-spawning Antarctic marine invertebrate. Journal of Heredity, 102 (1). 55-66. 10.1093/jhered/esq094

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Abstract/Summary

Although studies of population genetic structure are commonplace, a strong bias exists toward species from low latitudes and with relatively poor dispersal capabilities. Consequently, we used 280 amplified fragment length polymorphism bands to explore patterns of genetic differentiation among 8 populations of a high latitude broadcast-spawning marine mollusc, the Antarctic limpet Nacella concinna. Over 300 individuals were sampled along a latitudinal gradient spanning the Antarctic Peninsula from Adelaide Island to King George Island (67 degrees-62 degrees S), then to Signy Island (60 degrees S) and South Georgia (54 degrees S). Populations from the Antarctic Peninsula exhibited little genetic structure but were themselves strongly differentiated from both Signy and South Georgia. This finding was analytically highly robust and implies the presence of significant oceanographic barriers to gene flow in a species long regarded as a classic example of a widely dispersing broadcast spawner.

Item Type: Publication - Article
Digital Object Identifier (DOI): 10.1093/jhered/esq094
Programmes: BAS Programmes > Polar Science for Planet Earth (2009 - ) > Ecosystems
ISSN: 0022-1503
Additional Keywords: amplified fragment length polymorphisms; Antarctic limpet; Antarctic Peninsula; climate change; larval dispersal; mollusc; Nacella concinna; phylogeography
NORA Subject Terms: Marine Sciences
Zoology
Biology and Microbiology
Ecology and Environment
Date made live: 27 May 2011 07:38
URI: http://nora.nerc.ac.uk/id/eprint/13284

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