Spatiotemporal dynamics of the agricultural landscape mosaic drives distribution and abundance of dominant carabid beetles |
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Authors: | Ronan Marrec Gaël Caro Paul Miguet Isabelle Badenhausser Manuel Plantegenest Aude Vialatte Vincent Bretagnolle Bertrand Gauffre |
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Affiliation: | 1.Centre d’Etudes Biologiques de Chizé, UMR 7372,CNRS & Université de La Rochelle,Villiers en Bois,France;2.Department of Ecology and Evolutionary Biology,University of Toronto,Mississauga,Canada;3.Laboratoire Agronomie et Environnement, UMR 1121,Université de Lorraine,Vandoeuvre,France;4.INRA, USC 1339 CEBC,Villiers en Bois,France;5.Agrocampus Ouest, UMR IGEPP 1349,Le Rheu,France;6.Université de Toulouse, INPT ENSAT, UMR DYNAFOR 1201,Castanet Tolosan,France;7.LTER???ZA Plaine & Val de Sèvre???, CNRS-CEBC,Villiers en Bois,France |
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Abstract: | ContextAgroecosystems are dynamic, with yearly changing proportions of crops. Explicit consideration of this temporal heterogeneity is required to decipher population and community patterns but remains poorly studied.ObjectivesWe evaluated the impact on the activity-density of two dominant carabid species (Poecilus cupreus and Anchomenus dorsalis) of (1) local crop, current year landscape composition, and their interaction, and (2) inter-annual changes in landscape composition due to crop rotations.MethodsCarabids were sampled using pitfall-traps in 188 fields of winter cereals and oilseed rape in three agricultural areas of western France contrasting in their spatial heterogeneity. We summarized landscape composition in the current and previous years in a multi-scale perspective, using buffers of increasing size around sampling locations.ResultsBoth species were more abundant in oilseed rape, and in landscapes with a higher proportion of oilseed rape in the previous year. P. cupreus abundance was negatively influenced by oilseed rape proportion in the current year landscape in winter cereals and positively by winter cereal proportion in oilseed rape. A. dorsalis was globally impacted at finer scales than P. cupreus.ConclusionsResource concentration and dilution-concentration processes jointly appear to cause transient dynamics of population abundance and distribution among habitat patches. Inter-patch movements across years appear to be key drivers of carabids’ survival and distribution, in response to crop rotation. Therefore, the explicit consideration of the spatiotemporal dynamics of landscape composition can allow future studies to better evidence ecological processes behind observed species patterns and help developing new management strategies. |
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