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Appears in Collections:Biological and Environmental Sciences Journal Articles
Peer Review Status: Refereed
Title: Invertebrate grazing during the regenerative phase affects the ultimate structure of macrophyte communities
Authors: Elger, Arnaud
Willby, Nigel
Cabello-Martinez, Monica
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Keywords: clonality
macrophyte assemblages
propagule bank
Issue Date: Jun-2009
Publisher: Wiley-Blackwell
Citation: Elger A, Willby N & Cabello-Martinez M (2009) Invertebrate grazing during the regenerative phase affects the ultimate structure of macrophyte communities, Freshwater Biology, 54 (6), pp. 1246-1255.
Abstract: 1. Although the biomass of freshwater macrophytes consumed by invertebrate herbivores (excluding crayfish) is usually low, there is growing evidence that invertebrates do exert a structuring effect on macrophyte communities. To explain this, we postulated that the effect of invertebrates may be concentrated on macrophytes during their regenerative phase.2. We tested this hypothesis by means of a mesocosm-based experiment, in which we investigated the effects of different densities of pond snails [Lymnaea stagnalis (L.)] on macrophytes regenerating from the natural sediment propagule bank.3. After 2 months, a diverse macrophyte community had established in the absence of snails, mainly from sexual propagules. Under moderate snail grazing (4 individuals m-2), the ultimate biomass of macrophytes was similar, but its species composition differed dramatically. Only a few unpalatable taxa, such as Ceratophyllum demersum and Nymphaeaceae, persisted. Moreover, the relative success of macrophytes regenerating from vegetative rather than sexual propagules improved. Under higher snail grazing (20 m-2), all macrophytes disappeared before the end of the experiment.4. These results confirm that snails at natural densities can have a strong effect on the ultimate structure of macrophyte communities by selectively consuming some species at a juvenile stage. Therefore, the regenerative phase can be seen as a window of opportunity for invertebrate grazers, which can have a qualitative effect on communities that is disproportionate to the biomass consumed.
Type: Journal Article
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Rights: The publisher does not allow this work to be made publicly available in this Repository. Please use the Request a Copy feature at the foot of the Repository record to request a copy directly from the author. You can only request a copy if you wish to use this work for your own research or private study.
Affiliation: Laboratoire d'Ecologie Fonctionnelle
Biological and Environmental Sciences
Netherlands Institute of Ecology (NIOO)

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