| Summary: | Flexibility in activity timing may enable organisms to quickly adapt to environmental changes. Under global warming, diurnally adapted endotherms may achieve a better energy balance by shifting their activity towards cooler nocturnal hours. However, this shift may expose animals to new or increased environmental challenges (e.g., increased predation risk, reduced foraging efficiency). We analysed a large dataset of activity data from 47 ibex ( Capra ibex ) in two protected areas, characterized by varying levels of predation risk (presence vs absence of the wolf – Canis lupus ). We found that ibex increased nocturnal activity following warmer days and during brighter nights. Despite the considerable sexual dimorphism typical of this species and the consequent different predation-risk perception, males and females demonstrated consistent responses to heat in both predator-present and predator-absent areas. This supports the hypothesis that shifting activity towards nighttime may be a common strategy adopted by diurnal endotherms in response to global warming. As nowadays different pressures are pushing mammals towards nocturnality, our findings emphasize the urgent need to integrate knowledge of temporal behavioural modifications into management and conservation planning. Funding provided by: European Union Crossref Funder Registry ID: https://ror.org/019w4f821 Award Number: PON DM1062 Funding provided by: Ministry of Education, Universities and Research Crossref Funder Registry ID: https://ror.org/0166hxq48 Award Number: PRIN 20108TZKHC Activity data logging: The activity data of individual ibex (18 males and 9 females in PNGP, 12 males and 8 females in SNP, more details in the Supporting Information Table S1 and Table S2) were recorded by means of a dual-axis motion sensor (i.e., accelerometer) fitted on the collars. The accelerometer simultaneously measures along two orthogonal directions the changes in acceleration associated with the actual motion experienced by the collar. On the X-axis, the ...
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