Water geochemistry and sedimentary pigments in northern Victoria Land lakes,Antarctica |
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Authors: | F Borghini A Colacevich R Bargagli |
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Institution: | (1) Dipartimento di Scienze Ambientali, Università di Siena, Via P.A. Mattioli, 4, 53100 Siena, Italy |
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Abstract: | Total concentrations of algal pigments, organic C, C, N, P and S were determined in surface sediments from the littoral zone
of 21 lakes in ice-free areas of northern Victoria Land (Antarctica) with different climatic and environmental conditions.
Concentrations of major ions and nutrients were also determined in water samples from the same lakes. The latter samples had
extremely variable chemical compositions; however, all the lakes resulted oligotrophic. Pigment concentrations in surface
sediments were comparable to those reported for other Antarctic lakes and lower than those in oligotrophic lakes at lower
latitudes. Cyanophyta, Chlorophyta and Bacillariophyta were the main taxa identified. These taxa correspond to those reported
in previous microscopy-based studies on Antarctic phytoplankton and phytobenthos. Discriminant Function Analysis and Canonical
Correspondence Analysis of data indicate that the distribution of pigments in these Victoria Land lakes depends mainly on
their geographical location (particularly the distance from the sea) and nutrient status. |
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Keywords: | Antarctic lakes Water geochemistry Superficial sediments Photosynthetic pigments |
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