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Consumer trait responses track change in resource supply along replicated thermal gradients.
Moffett, E R; Fryxell, D C; Lee, F; Palkovacs, E P; Simon, K S.
Afiliação
  • Moffett ER; School of Environment, The University of Auckland, Private Bag 92019, Auckland, New Zealand.
  • Fryxell DC; Department of Ecology and Evolutionary Biology, University of California, Santa Cruz, CA 95060, USA.
  • Lee F; School of Environment, The University of Auckland, Private Bag 92019, Auckland, New Zealand.
  • Palkovacs EP; Department of Ecology and Evolutionary Biology, University of California, Santa Cruz, CA 95060, USA.
  • Simon KS; School of Environment, The University of Auckland, Private Bag 92019, Auckland, New Zealand.
Proc Biol Sci ; 288(1964): 20212144, 2021 12 08.
Article em En | MEDLINE | ID: mdl-34847762
Rising temperatures may alter consumer diets through increased metabolic demand and altered resource availability. However, current theories assessing dietary shifts with warming do not account for a change in resource availability. It is unknown whether consumers will increase consumption rates or consume different resources to meet increased energy requirements and whether the dietary change will lead to associated variation in morphology and nutrient utilization. Here, we used populations of Gambusia affinis across parallel thermal gradients in New Zealand (NZ) and California (CA) to understand the influence of temperature on diets, morphology and stoichiometric phenotypes. Our results show that with increasing temperature in NZ, mosquitofish consumed more plant material, whereas in CA mosquitofish shifted towards increased consumption of invertebrate prey. In both regions, populations with plant-based diets had fuller guts, longer relative gut lengths, better-orientated mouths and reduced body elemental %C and N/P. Together, our results show multiple pathways by which consumers may alter their feeding patterns with rising temperatures, and they suggest that warming-induced changes to resource availability may be the principal determinant of which pathway is taken.
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Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Assunto principal: Ciprinodontiformes / Invertebrados Limite: Animals Idioma: En Ano de publicação: 2021 Tipo de documento: Article

Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Assunto principal: Ciprinodontiformes / Invertebrados Limite: Animals Idioma: En Ano de publicação: 2021 Tipo de documento: Article