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Quantitative relationships between benthic diatom assemblages and water chemistry in Macquarie Island lakes and their potential for reconstructing past environmental changes

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Saunders, KM and Hodgson, DA and McMinn, A (2009) Quantitative relationships between benthic diatom assemblages and water chemistry in Macquarie Island lakes and their potential for reconstructing past environmental changes. Antarctic Science, 21 (1). pp. 35-49. ISSN 0954-1020

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Abstract

This study is the first published survey of diatom-environment relationships on sub-Antarctic Macquarie Island. Fifty-eight sites in 50 coastal and inland lakes were sampled for benthic diatoms and water chemistry. 208 diatom species from 34 genera were identified. Multivariate analyses indicated that the lakes were distributed along nutrient and conductivity gradients. Conductivity, pH, phosphate (SRP), silicate and temperature all explained independent portions of the variance in the diatom data. Transfer functions provide a quantitative basis for palaeolimnological studies of past climate change and human impacts, and can be used to establish baseline conditions for assessing the impacts of recent climate change and the introduction of non-native plants and animals. Statistically robust diatom transfer functions for conductivity, phosphate and silicate were developed, while pH and temperature transfer functions performed less well. The lower predictive abilities of the pH and temperature transfer functions probably reflect the broad pH tolerance range of diatoms on Macquarie Island and uneven distribution of lakes along the temperature gradient. This study contributes to understanding the current ecological distribution of Macquarie Island diatoms and provides transfer functions that will be applied in studies of diatoms in lake sediment cores to quantitatively reconstruct past environmental changes.

Item Type: Article
Keywords: climate change, limnology, management, palaeolimnology, sub-Antarctic, transfer function
Journal or Publication Title: Antarctic Science
Page Range: pp. 35-49
ISSN: 0954-1020
Identification Number - DOI: 10.1017/S0954102008001442
Additional Information: Copyright © 2009 Cambridge University Press
Date Deposited: 21 Nov 2011 02:58
Last Modified: 18 Nov 2014 04:24
URI: http://eprints.utas.edu.au/id/eprint/12242
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