Title
Inland diatoms from the McMurdo Dry Valleys and James Ross Island, Antarctica Inland diatoms from the McMurdo Dry Valleys and James Ross Island, Antarctica
Author
Faculty/Department
Faculty of Sciences. Biology
Publication type
article
Publication
Ottawa, Ont. ,
Subject
Biology
Source (journal)
Botany : an international journal for plant biology. - Ottawa, Ont., 2008, currens
Volume/pages
86(2008) :12 , p. 1378-1392
ISSN
1916-2790
1916-2804
Carrier
E
Target language
English (eng)
Affiliation
University of Antwerp
Abstract
Diatom taxa present in the inland streams and lakes of the McMurdo Dry Valleys and James Ross Island, Antarctica, are presented in this paper. A total of nine taxa are illustrated, with descriptions of four new species (Luticola austroatlantica sp. nov., Luticola dolia sp. nov., Luticola laeta sp. nov., Muelleria supra sp. nov.). In the perennially ice-covered lakes of the McMurdo Dry Valleys, diatoms are confined to benthic mats within the photic zone. In streams, diatoms are attached to benthic surfaces and within the microbial mat matrix. One species, L. austroatlantica, is found on James Ross Island, of the southern Atlantic archipelago, and the McMurdo Dry Valleys. The McMurdo Dry Valley populations are at the lower range of the size spectrum for the species. Streams flow for 610 weeks during the austral summer, when temperatures and solar radiation allow glacial ice to melt. The diatom flora of the region is characterized by species assemblages favored under harsh conditions, with naviculoid taxa as the dominant group and several major diatom groups conspicuously absent.
Handle