Antarctic Science



Taxonomy, ecology and zoogeography of two East Antarctic freshwater calanoid copepod species: Boeckella poppei and Gladioferens antarcticus


I.A.E. BAYLY a1a2, J.A.E. GIBSON a3a4c1, B. WAGNER a5 and K.M. SWADLING a4
a1 School of Biological Sciences, Monash University, VIC 3800, Australia
a2 501 Killiecrankie Rd, Flinders Island, TAS 7255, Australia
a3 Institute of Antarctic and Southern Ocean Studies, University of Tasmania, Private Bag 77, Hobart, TAS 7001, Australia
a4 School of Zoology, University of Tasmania, Private Bag 5, Hobart, TAS 7001, Australia
a5 Institute for Geophysics and Geology, Faculty for Physics and Geoscience, University Leipzig, Talstrasse 35, D-04103 Leipzig, Germany

Article author query
bayly i   [PubMed][Google Scholar] 
gibson j   [PubMed][Google Scholar] 
wagner b   [PubMed][Google Scholar] 
swadling k   [PubMed][Google Scholar] 

Abstract

New populations of the two species of calanoid copepods known to inhabit freshwater lakes in East Antarctica, Boeckella poppei (Mrázek, 1901) and Gladioferens antarcticus Bayly, 1994, have recently been discovered. The morphology of the populations of B. poppei showed significant differences, notably a reduction in the armature of the male fifth leg, when compared with typical specimens from the Antarctic Peninsula and South America. Gladioferens antarcticus had previously been recorded from a single lake in the Bunger Hills, but has now been recorded from three further lakes in this region. A recent review of Antarctic terrestrial and limnetic zooplankton suggested that neither of these species can be considered an East Antarctic endemic, with B. poppei being listed as a recent anthropogenic introduction and G. antarcticus a ‘marine interloper’. We conclude differently: B. poppei has been present in isolated populations in East Antarctica for significant lengths of time, possibly predating the current interglacial, while G. antarcticus is a true Antarctic endemic species whose ancestors have been present in the region since before Australia separated from Antarctica.

(Received April 16 2003)
(Accepted September 15 2003)


Key Words: Amery Oasis; biogeography; Bunger Hills; ecology; epishelf lake; Gondwana; vicariance.

Correspondence:
c1 corresponding author: John.gibson@csiro.au


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