Should I stay or should I go? The diurnal behaviour of plant-attached zooplankton in lakes with different water transparency

Abstract

The role of transparency on the diurnal distribution of plant-attached cladocerans was studied in two similar-sized lakes with contrasting water colour. The diurnal attachment behaviour of Sida crystallina (O.F. Müller, 1776) was more pronounced in the less humic lake where the animals remained fixed on plants, indicating that staying attached was a more profitable option. In the highly humic lake, the pattern was opposite, and regardless of time the highest density observed was in the free-swimming individuals, with only few animals attached to the floating-leaves for refuge, indicating that low transparency provided sufficient protection against predation. The attached S. crystallina were larger compared to free-swimming individuals in the more transparent lake, suggesting greater vulnerability of large-sized individuals to predation. The results indicate that increasing concentrations of humic substances affecting the light environment may alter the diurnal behaviour and habitat use of plant-attached zooplankton. 

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Author Biographies

Satu Estlander, University of Helsinki
Department of Environmental Sciences
Jukka Horppila, University of Helsinki
Department of Environmental Sciences
Mikko Olin, University of Helsinki
Department of Environmental Sciences
Leena Nurminen, University of Helsinki
Department of Environmental Sciences
Published
2017-01-18
Info
Issue
Section
Original Articles
Supporting Agencies
University of Helsinki, Bergsrådet Bror Serlachius Foundation
Keywords:
Cladocera, humic lakes, littoral, Sida crystallina (O.F. Müller).
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How to Cite
1.
Estlander S, Horppila J, Olin M, Nurminen L. Should I stay or should I go? The diurnal behaviour of plant-attached zooplankton in lakes with different water transparency. J Limnol [Internet]. 2017Jan.18 [cited 2021May6];76(2). Available from: https://jlimnol.it/index.php/jlimnol/article/view/jlimnol.2017.1564