caa a22 4500 445383992 CHVBK 20180317143026.0 cr unu---uuuuu 170323e20111201xx s 000 0 eng 10.1007/s10021-011-9484-0 doi (NATIONALLICENCE)springer-10.1007/s10021-011-9484-0 Surface Water Linkages Regulate Trophic Interactions in a Groundwater Food Web [Elektronische Daten] [Arnaud Foulquier, Florian Malard, Florian Mermillod-Blondin, Bernard Montuelle, Sylvain Dolédec, Bernadette Volat, Janine Gibert] Groundwaters are increasingly viewed as resource-limited ecosystems in which fluxes of dissolved organic carbon (DOC) from surface water are efficiently mineralized by a consortium of microorganisms which are grazed by invertebrates. We tested for the effect of groundwater recharge on resource supply and trophic interactions by measuring physico-chemistry, microbial activity and biomass, structure of bacterial communities and invertebrate density at three sites intensively recharged with surface water. Comparison of measurements made in recharge and control well clusters at each site showed that groundwater recharge significantly increased fluxes of DOC and phosphate, elevated groundwater temperature, and diminished dissolved oxygen (DO). Microbial biomass and activity were significantly higher in recharge well clusters but stimulation of autochthonous microorganisms was not associated with a major shift in bacterial community structure. Invertebrate assemblages were not significantly more abundant in recharge well clusters and did not show any relationship with microbial biomass and activity. Microbial communities were bottom-up regulated by DOC and nutrient fluxes but trophic interactions between microorganisms and invertebrates were apparently limited by environmental stresses, particularly DO depletion and groundwater warming. Hydrological connectivity is a key factor regulating the function of DOC-based groundwater food webs as it influences both resource availability for microorganisms and environmental stresses which affect energy transfer to invertebrates and top-down control on microorganisms. Springer Science+Business Media, LLC, 2011 bacterial community structure nationallicence crustaceans nationallicence denaturing gradient gel electrophoresis nationallicence dissolved organic carbon nationallicence environmental stress nationallicence groundwater recharge nationallicence microbial activity nationallicence microbial biomass nationallicence sediment biofilm nationallicence trophic relationships nationallicence Foulquier Arnaud Université de Lyon, 69000, Lyon, France aut Malard Florian Université de Lyon, 69000, Lyon, France aut Mermillod-Blondin Florian Université de Lyon, 69000, Lyon, France aut Montuelle Bernard Cemagref, Groupement de Lyon, UR Milieux Aquatiques, Écologie et Pollutions, Laboratoire d'Écologie Microbienne des Hydrosystèmes Anthropisés, 3 bis Quai Chauveau, CP 220, 69336, Lyon Cedex 09, France aut Dolédec Sylvain Université de Lyon, 69000, Lyon, France aut Volat Bernadette Cemagref, Groupement de Lyon, UR Milieux Aquatiques, Écologie et Pollutions, Laboratoire d'Écologie Microbienne des Hydrosystèmes Anthropisés, 3 bis Quai Chauveau, CP 220, 69336, Lyon Cedex 09, France aut Gibert Janine Université de Lyon, 69000, Lyon, France aut Ecosystems Springer-Verlag 14/8(2011-12-01), 1339-1353 1432-9840 14:8<1339 2011 14 10021 https://doi.org/10.1007/s10021-011-9484-0 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s10021-011-9484-0 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Foulquier Arnaud Université de Lyon, 69000, Lyon, France aut NATIONALLICENCE 700 1- Malard Florian Université de Lyon, 69000, Lyon, France aut NATIONALLICENCE 700 1- Mermillod-Blondin Florian Université de Lyon, 69000, Lyon, France aut NATIONALLICENCE 700 1- Montuelle Bernard Cemagref, Groupement de Lyon, UR Milieux Aquatiques, Écologie et Pollutions, Laboratoire d'Écologie Microbienne des Hydrosystèmes Anthropisés, 3 bis Quai Chauveau, CP 220, 69336, Lyon Cedex 09, France aut NATIONALLICENCE 700 1- Dolédec Sylvain Université de Lyon, 69000, Lyon, France aut NATIONALLICENCE 700 1- Volat Bernadette Cemagref, Groupement de Lyon, UR Milieux Aquatiques, Écologie et Pollutions, Laboratoire d'Écologie Microbienne des Hydrosystèmes Anthropisés, 3 bis Quai Chauveau, CP 220, 69336, Lyon Cedex 09, France aut NATIONALLICENCE 700 1- Gibert Janine Université de Lyon, 69000, Lyon, France aut NATIONALLICENCE 773 0- Ecosystems Springer-Verlag 14/8(2011-12-01), 1339-1353 1432-9840 14:8<1339 2011 14 10021 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer