Antarctic Science

IX SCAR International Biology Symposium

New insights into the origins of crustaceans of Antarctic lakes

John A.E. Gibsona1a2 c1 and Ian A.E. Baylya3a4

a1 Institute for Antarctic and Southern Ocean Studies, University of Tasmania, Private Bag 77, Hobart, Tasmania 7001, Australia

a2 School of Zoology, University of Tasmania, Private Bag 5, Hobart, Tasmania 7001, Australia

a3 School of Biological Sciences, Monash University, Victoria 3800, Australia

a4 501 Killiecrankie Road, Flinders Island, Tasmania 7255, Australia

Abstract

New evidence regarding the origins of the Crustacea of Antarctic lakes is reviewed. Palaeolimnological data indicates that the cladoceran Daphniopsis studeri has been present in Lake Reid, Larsemann Hills, for over 120 000 yr. This is the first direct evidence of a continental lacustrine refugium during the last glacial maximum. There are strong indications that the calanoid copepod Boeckella poppei maintained populations over the same period in lakes of the Amery Oasis, and the rapid post-glacial colonization by this species of newly formed lakes on the Antarctic Peninsula and Signy Island argues for a local rather than an extra-continental source. Evidence for the entry of marine-derived species into the longer term fauna of the continent is also presented. It is concluded that many of the Crustacea in Antarctic lakes are likely to have had a long association with the continent.

(Received March 29 2006)

(Accepted May 15 2006)

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