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Dynamics of rotifer and cladoceran resting stages during copper pollution and recovery in a subalpine lake

Published online by Cambridge University Press:  03 May 2012

Roberta Piscia*
Affiliation:
CNR ISE Largo Tonolli 50, 28922 Verbania, Italy
Piero Guilizzoni
Affiliation:
CNR ISE Largo Tonolli 50, 28922 Verbania, Italy
Diego Fontaneto
Affiliation:
Division of Biology, Imperial College London, Silwood Park Campus, Ascot Berkshire SL5 7PY, UK
Davide A.L. Vignati
Affiliation:
CNR IRSA, UOS Brugherio, Via del Mulino 19, 20047 Brugherio (MB), Italy
Peter G. Appleby
Affiliation:
Environmental Radioactivity Research Centre, Mathematical Sciences Building, University of Liverpool, Liverpool L69 7ZL, UK
Marina Manca
Affiliation:
CNR ISE Largo Tonolli 50, 28922 Verbania, Italy
*
*Corresponding author: [email protected]
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Abstract

Despite their ecological importance and ability to react to environmental changes, including pollution, monogonont rotifers have never been used in palaeolimnological studies because they do not leave subfossil remains. In this study, we tested the possibility of using rotifer resting eggs as a proxy for reconstruction of changes in biodiversity during chronic copper pollution and recovery of a deep sudalpine lake (Lake Orta, Italy). The lake was selected owing to a rich history of previous studies that explored species-specific responses to environmental stressors. Rotifer-based results were compared with those on ephippia and on previously investigated Cladocera subfossil remains. Responses of Rotifera resting eggs to environmental changes were clear and consistent with those previously observed on Cladocera. The abundance of resting eggs increased during pollution, and new morphotypes appeared in addition to those already present. However, overall diversity decreased sharply, as a few morphotypes became dominant. Resting eggs of Brachionus calyciflorus as old as ca. 100 years were still fully viable; viability was not affected by toxic conditions of the environment in which the eggs were produced. Over a period of ca. 80 years, all resting eggs of B. calyciflorus belonged to a single clone, the most widely distributed one in North America. Cladocera ephippia started to accumulate later and at a lower level of abundance than rotifer resting eggs. Overall, Cladocera ephippia were, however, less effective than rotifers in tracing lake historical changes. The results point out at the great potential of using rotifer resting eggs in palaeolimnological reconstructions.

Type
Research Article
Copyright
© EDP Sciences, 2012

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