A common temperature dependence of nutritional demands in invertebrates

CECILIA LASPOUMADERES; CEDRIC MEUNIER; AMARU MAGNIN; BERLINGHOF, JOHANNA; ELSER, JAMES J.; BALSEIRO, ESTEBAN; TORRES, GABRIELA; MODENUTTI, BEATRIZ; TREMBLAY, NELLY; BOERSMA, MAARTEN

Palma de Mallorca

Congreso; ASLO Aquatic Sciences Meeting 2023: Resilience and Recovery in Aquatic Systems; 2023

In light of ongoing climate change, it is increasingly important to know how nutritional requirementsof ectotherms are affected by changing temperatures. Here, we analyse the wide thermal responseof phosphorus (P) requirements via elemental gross growth efficiencies of Carbon (C) and P, and theThreshold Elemental Ratios in different aquatic invertebrate ectotherms: the freshwater modelspecies Daphnia magna, the marine copepod Acartia tonsa, the marine heterotrophicdinoflagellate Oxyrrhis marina, and larvae of two populations of the marine crab Carcinus maenas.We show that they all share a non-linear cubic thermal response of nutrient requirements.Phosphorus requirements decrease from low to intermediate temperatures, increase at highertemperatures and decrease again when temperature is excessive. This common thermalresponse of nutrient requirements is of great importance if we aim to understand or even predict howectotherm communities will react to global warming and nutrient-driven eutrophication.