Understanding the ontogeny of foraging behaviour: insights from combining marine predator bio-logging with satellite-derived oceanography in hidden Markov models.

Autor:	Grecian WJ; School of Biology, Faculty of Biological Sciences, University of Leeds, Leeds LS2 9JT, UK wjg5@st-andrews.ac.uk.; Sea Mammal Research Unit, Scottish Oceans Institute, University of St Andrews, St Andrews KY16 8LB, UK., Lane JV; School of Biology, Faculty of Biological Sciences, University of Leeds, Leeds LS2 9JT, UK., Michelot T; School of Mathematics and Statistics, University of Sheffield, Sheffield S3 7RH, UK., Wade HM; Scottish Natural Heritage, Battleby, Redgorton, Perth PH1 3EW, UK., Hamer KC; School of Biology, Faculty of Biological Sciences, University of Leeds, Leeds LS2 9JT, UK.
Jazyk:	angličtina
Zdroj:	Journal of the Royal Society, Interface [J R Soc Interface] 2018 Jun; Vol. 15 (143).
DOI:	10.1098/rsif.2018.0084
Abstrakt:	The development of foraging strategies that enable juveniles to efficiently identify and exploit predictable habitat features is critical for survival and long-term fitness. In the marine environment, meso- and sub-mesoscale features such as oceanographic fronts offer a visible cue to enhanced foraging conditions, but how individuals learn to identify these features is a mystery. In this study, we investigate age-related differences in the fine-scale foraging behaviour of adult (aged ≥ 5 years) and immature (aged 2-4 years) northern gannets Morus bassanus Using high-resolution GPS-loggers, we reveal that adults have a much narrower foraging distribution than immature birds and much higher individual foraging site fidelity. By conditioning the transition probabilities of a hidden Markov model on satellite-derived measures of frontal activity, we then demonstrate that adults show a stronger response to frontal activity than immature birds, and are more likely to commence foraging behaviour as frontal intensity increases. Together, these results indicate that adult gannets are more proficient foragers than immatures, supporting the hypothesis that foraging specializations are learned during individual exploratory behaviour in early life. Such memory-based individual foraging strategies may also explain the extended period of immaturity observed in gannets and many other long-lived species. (© 2018 The Authors.)
Databáze:	MEDLINE
Externí odkaz:	Zobrazit plný text záznamu