Limnological characteristics of the freshwater ecosystems of Byers Peninsula, Livingston Island, in maritime Antarctica |
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Authors: | M Toro A Camacho C Rochera E Rico M Bañón E Fernández-Valiente E Marco A Justel M C Avendaño Y Ariosa W F Vincent A Quesada |
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Institution: | (1) Centro Estudios Hidrográficos, Cedex, Paseo Bajo Virgen del Puerto, 3, 28005 Madrid, Spain;(2) Departamento de Microbiología y Ecología, Instituto Cavanilles de Biodiversidad y Biología Evolutiva, Edificio de Investigación, Campus de Burjassot, Universitat de Valencia, 46100 Burjassot, Spain;(3) Departamento de Ecología, Universidad Autónoma de Madrid, Madrid, Spain;(4) Instituto Nacional de Meteorología, Guadalupe-Murcia, Spain;(5) Departamento de Matemáticas, Universidad Autónoma de Madrid, Madrid, Spain;(6) Département de Biologie, Centre d’études Nordiques, Université Laval, Sainte-Foy, QC, Canada, G1K 7P4;(7) Departamento Biología, Universidad Autónoma de Madrid, Madrid, Spain |
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Abstract: | A limnological survey of 15 lakes and 6 streams was carried out on Byers Peninsula (Livingston Island, South Shetland Islands,
Antarctica) during austral summer 2001–2002. Most of the surface waters had low conductivities (20–105 μS cm−1) and nutrients (total phosphorus 0.01–0.24 μM), but some coastal lakes were enriched by nutrient inputs from seal colonies
and marine inputs. Plankton communities in the lakes contained picocyanobacteria (102–104 cells ml−1), diatoms, chrysophytes and chlorophytes, and a large fraction of the total biomass was bacterioplankton. Zooplankton communities
were dominated by Boeckella poppei and Branchinecta gainii; the benthic cladoceran Macrothrix ciliata was also recorded, for the first time in Antarctica. The chironomids Belgica antarctica and Parochlus steinenii, and the oligochaete Lumbricillus sp., occurred in stream and lake benthos. The phytobenthos included cyanobacterial mats, epilithic diatoms and the aquatic
moss Drepanocladus longifolius. These observations underscore the limnological richness of this seasonally ice-free region in maritime Antarctica and its
value as a long-term reference site for monitoring environmental change. |
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Keywords: | Antarctica Limnology Plankton Benthos Biodiversity Lakes |
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