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  • 1.
    Carreira, Bruno M.
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Ecology and Genetics, Animal ecology. Univ Lisbon, cE3c, Fac Ciencias, Bloco C2, P-1749016 Lisbon, Portugal;Univ South Bohemia, Fac Sci, Dept Ecosyst Biol & Soil & Water Res Infrastruct, Branisovska 1760, Ceske Budejovice 37005, Czech Republic.
    Segurado, Pedro
    Univ Lisbon, Ctr Estudos Florestais, Inst Super Agron, P-1349017 Lisbon, Portugal.
    Laurila, Anssi
    Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Ecology and Genetics, Animal ecology.
    Rebelo, Rui
    Univ Lisbon, cE3c, Fac Ciencias, Bloco C2, P-1749016 Lisbon, Portugal.
    Heat waves trigger swift changes in the diet and life-history of a freshwater snail2020In: Hydrobiologia, ISSN 0018-8158, E-ISSN 1573-5117, Vol. 847, no 4, p. 999-1011Article in journal (Refereed)
    Abstract [en]

    Extreme climatic events, such as heat waves, may induce changes in nutrient acquisition by omnivorous ectotherms. Likely modulated by the intensity, frequency and duration of these events, dietary shifts during heat waves may threaten the stability of freshwaters. We investigated the effects of heat wave duration on diet assimilation and life-history traits of the freshwater gastropod Radix balthica. We compared the magnitude of the effects of a short (1 week) and a long heat wave (7 weeks) on the assimilation of animal- and plant-based diets, measuring performance in terms of growth rate and reproduction. We hypothesized that heat waves should increase the proportion of plant material assimilated on the mixed diet and change the performance of snails on the animal and plant-based diets. Both heat waves increased the assimilation of plant material on the mixed diet and growth rate, with minor negative effects on reproduction. However, responses were disproportional to heat wave duration, as the short heat wave elicited swift and relatively stronger responses. Our findings showcase the role of phenotypic plasticity in aiding ectotherms to cope with increased thermal stress and acclimate. Temporarily changing the strength of trophic interactions, heat waves may alter community dynamics in freshwater habitats.

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