Aquatic plant shows flexible avoidance by escape from tuber predation by swans

Hidding, Bert, Klaassen, Marcel, de Boer, Thijs, de Vries, Peter P. and Nolet, Bart A. 2012, Aquatic plant shows flexible avoidance by escape from tuber predation by swans, Basic and applied ecology, vol. 13, no. 1, pp. 50-58.

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Title Aquatic plant shows flexible avoidance by escape from tuber predation by swans
Author(s) Hidding, Bert
Klaassen, MarcelORCID iD for Klaassen, Marcel
de Boer, Thijs
de Vries, Peter P.
Nolet, Bart A.
Journal name Basic and applied ecology
Volume number 13
Issue number 1
Start page 50
End page 58
Total pages 9
Publisher Urban und Fischer Verlag
Place of publication Jena, Germany
Publication date 2012-02
ISSN 1439-1791
Keyword(s) aquatic macrophytes
below-ground herbivory
Bewick's swan
clonal plant
genotype sorting
induced defence
maternal carry-over effects
phenotypic plasticity
Summary Deeper burial of bulbs and tubers has been suggested as an escape against below-ground herbivory by vertebrates, but experimental evidence is lacking. As deep propagule burial can incur high costs of emergence after dormancy, burial depth may represent a trade-off between sprouting survival and herbivore avoidance. We tested whether burial depth of subterraneous tubers is a flexible trait in fennel pondweed (Potamogeton pectinatus), facing tuber predation by Bewick's swans (Cygnus columbianus bewickii) in shallow lakes in winter. In a four-year experiment involving eight exclosures, winter herbivory by swans and all vertebrate summer herbivory were excluded in a full-factorial design; we hence controlled for aboveground vertebrate herbivory in summer, possibly influencing tuber depth. Tuber depth was measured each September before swan arrival and each March before tuber sprouting. In accordance with our hypothesis, tuber depth in September decreased after excluding Bewick's swans in comparison to control plots. The summer exclosure showed an increase in tuber biomass and the number of shallow tubers, but not a significant effect on the mean burial depth of tuber mass. Our results suggest that a clonal plant like P. pectinatus can tune the tuber burial depth to predation pressure, either by phenotypic plasticity or genotype sorting, hence exhibiting flexible avoidance by escape. We suggest that a flexible propagule burial depth can be an effective herbivore avoidance strategy, which might be more widespread among tuber forming plant species than previously thought.
Language eng
Field of Research 069999 Biological Sciences not elsewhere classified
Socio Economic Objective 970106 Expanding Knowledge in the Biological Sciences
HERDC Research category C1 Refereed article in a scholarly journal
Copyright notice ©2011, Gesellschaft für Ökologie
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