Abstract
Specific composition and species clonal traits were characterized along combined flooding and grazing gradients to answer two questions. i) To what extent does the interaction of flooding and grazing influence the clonal characteristics of the vegetation? ii) Are the effects of both environmental factors independent or interactive? This study was carried out in a wet meadow along the Atlantic coast (France). Three plant communities (hygrophilous, meso-hygrophilous and mesophilous) were distinguished along a flooding gradient and five levels of grazing pressure were controlled through an experimental design (from no grazing to heavy grazing). We monitored species composition and retrieved, for each species, the type of clonal growth organs (CGOs) and clonal traits from the CLO-PLA3 database. We identified two syndromes of clonal traits: “above-ground splitters” and “below-ground integrators”. Clonal traits played a key role in plant assembly in the studied meadows. The interaction of both environmental factors selected for particular syndromes of clonal traits; however, flooding had a stronger filtering effect than grazing. The hygrophilous community was dominated by above-ground splitters, whereas the meso-hygrophilous vegetation was dominated by below-ground integrators. In the mesophilous community, clonal composition was the most diverse and shared clonal traits with the vegetation of both the hygrophilous and meso-hygrophilous communities. Grazing impact on CGOs and clonal traits differed between plant communities, i.e., the effect of grazing was modulated by the flooding regime. This study confirmed that vegetation responses to grazing might depend on the pool of traits, primarily filtered by environmental factors such as flooding.
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Acknowledgements
The authors would like to thank the persons who provided technical support for this study, in particular Stéphane Barbier for his contribution toward data collection. We are grateful to Jitka Klimešová and Tomáš Herben for their proposition to contribute to this special issue of Folia Geobotanica. We also would like to thank the anonymous reviewers for their comments on earlier versions of this manuscript, which proved very helpful for its improvement. The English content has been corrected by Sarah Mullin. This work is a publication from the DIVHERB Project (French national program ECOGER funded by the Institut National de la Recherche Agronomique) and a contribution to GDR 2574 “TRAITS”.
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Benot, ML., Mony, C., Merlin, A. et al. Clonal Growth Strategies Along Flooding and Grazing Gradients in Atlantic Coastal Meadows. Folia Geobot 46, 219–235 (2011). https://doi.org/10.1007/s12224-010-9082-5
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DOI: https://doi.org/10.1007/s12224-010-9082-5