UCL logo

UCL Discovery

UCL home » Library Services » Electronic resources » UCL Discovery

Foraging constraints reverse the scaling of activity time in carnivores

Rizzuto, M; Carbone, C; Pawar, S; (2018) Foraging constraints reverse the scaling of activity time in carnivores. Nature Ecology & Evolution , 2 pp. 247-253. 10.1038/s41559-017-0386-1. Green open access

[img]
Preview
Text
Carbone_Rizzuto_etal_Activity_Final.pdf - ["content_typename_Accepted version" not defined]

Download (579kB) | Preview

Abstract

The proportion of time an animal spends actively foraging in a day determines its long-term fitness. Here, we derive a general mathematical model for the scaling of this activity time with body size in consumers. We show that this scaling can change from positive (increasing with size) to negative (decreasing with size) if the detectability and availability of preferred prey sizes is a limiting factor. These predictions are supported by a global dataset on 73 terrestrial carnivore species from 8 families spanning >3 orders of magnitude in size. Carnivores weighing ∼5 kg experience high foraging costs because their diets include significant proportions of relatively small (invertebrate) prey. As a result, they show an increase in activity time with size. This shifts to a negative scaling in larger carnivores as they shift to foraging on less costly vertebrate prey. Our model can be generalized to other classes of terrestrial and aquatic consumers and offers a general framework for mechanistically linking body size to population fitness and vulnerability in consumers.

Type: Article
Title: Foraging constraints reverse the scaling of activity time in carnivores
Open access status: An open access version is available from UCL Discovery
DOI: 10.1038/s41559-017-0386-1
Publisher version: https://doi.org/10.1038/s41559-017-0386-1
Language: English
Additional information: This version is the author accepted manuscript. For information on re-use, please refer to the publisher’s terms and conditions.
Keywords: Behavioural ecology, Biomechanics, Theoretical ecology
UCL classification: UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Life Sciences
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Life Sciences > Div of Biosciences
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Life Sciences > Div of Biosciences > Genetics, Evolution and Environment
URI: http://discovery.ucl.ac.uk/id/eprint/10065741
Downloads since deposit
38Downloads
Download activity - last month
Download activity - last 12 months
Downloads by country - last 12 months

Archive Staff Only

View Item View Item