Do alternative resources dampen functional responses of native but not alien gammarids?

Ross N Cuthbert, Syrmalenia G Kotronaki, Jasmin C Hütt, Elisabeth Renk, Niklas Warlo & Elizabeta Briski
While aquatic invasive predators are among the most impactful trophic groups, we lack understanding of whether alternative food resources mediate adverse predatory effects and stabilise native prey communities. Here, we use comparative functional responses to examine the influence of alternative food resources (Fucus sp.) on predator-prey interaction strengths from three gammarid crustaceans, with one native (Gammarus locusta) and two existing and emerging invasive (Gammarus tigrinus, Pontogammarus maeoticus, respectively) species, towards larval chironomid prey. All gammarids...
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