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Climate change projections indicate increased precipitation in northern Europe, leading to increased inow of allochthonous organic matter to aquatic systems. The food web responses are poorly known, and may differ depending on the trophic structure. We performed an experimental mesocosm study where effects of labile dissolved organic carbon (DOC) on two different pelagic food webs were investigated, one having zooplankton as highest trophic level and the other with planktivorous sh as top consumer. In both food webs, DOC caused higher bacterial production and lower food web efciency, i.e., energy transfer efciency from the base to the top of the food web. However, the top-level response to DOC addition differed in the zooplankton and the sh systems. The zooplankton production increased due to efcient channeling of energy via both the bacteria land the phytoplankton pathway, while the sh production decreased due to channeling of energy mainly via the longer and less efcient bacterial pathway. We conclude that the added DOC either acted as a subsidy by increasing the production of the top trophic level (mesozooplankton), or as a sink causing decreased top consumer production (planktivorous sh).<p>Originally published in manuscript form with title<em> Food web interactions determine transfer efficiency and top consumer responses to increased allochthonous carbon input</em></p

Food web interactions determine energy transfer efficiency and top consumer responses to inputs of dissolved organic carbon