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5/22/2018 | 2:15 PM - 2:30 PM | TEMPORAL VARIATION IN SPATIAL STRUCTURING DURING MACROINVERTEBRATE COMMUNITY ASSEMBLY IN FLOODPLAIN PONDS: A FIELD EXPERIMENT | 420 A
TEMPORAL VARIATION IN SPATIAL STRUCTURING DURING MACROINVERTEBRATE COMMUNITY ASSEMBLY IN FLOODPLAIN PONDS: A FIELD EXPERIMENT
It is well established that both spatial dynamics and environmental filtering can affect the structure of ecological communities, but the temporal shifts in the relative importance of these processes remain largely unexplored. However, temporal dynamics are central to the functioning of many ecosystems, for instance in highly dynamic alluvial floodplains, where habitat patches undergo frequent cycles of disturbance-recovery. In order to examine the temporal shifts between environmental filtering and spatial structuring, we excavated 24 ponds out of a gravel bar in the Maggia River floodplain (Switzerland) and monitored the assembly of the macroinvertebrate communities during the summer of 2016. At the outset of community assembly, environmental differences linked to different hydrological settings resulted in the community being structured by a combination of mass effects and species sorting. As the assembly progressed, the effect of the environment on community structure decreased and communities converged. This structural convergence was strongly affected by the distance to source habitats. Overall, spatial location with regard to source habitats exerted a strong influence on community composition and functional diversity, and this effect was strongly dependent on the level of productivity in the receiving habitat patches.
- Community
- Invertebrate
- Floodplain
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Presenters/Authors
Pierre Chanut
(), EAWAG (Swiss Federal Institute of Aquatic Science and Technology), pierre.chanut@eawag.ch;
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Francis Burdon
(), Swedish University of Agricultural Sciences, Uppsala, Sweden, francis.burdon@slu.se;
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Thibault Datry
(), INRAE, France, Thibault.datry@inrae.fr;
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Christopher Robinson
(), Swiss Federal Institute of Aquatic Science and Technology, EAWAG ; Aquatic Ecology dpt., Christopher.robinson@eawag.ch;
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