Individual differences in searching behaviour and spatial foraging consistency in a central place marine predator
By Samantha C. Patrick, S. Bearhop, D. Grémillet, A. Lescroël, W. J. Grecian, T. Bodey, Keith C. Hamer, Ewan D. Wakefield, Mélanie Le Nuz, S. Votier. 2014
161 citations recorded by the source corpus.
Consistent intra-population variability in foraging behaviour is found among a wide range of taxa. Such foraging specialisations are common among marine vertebrates, yet it is not clear how individuals repeatedly locate prey or foraging sites at ocean-wide scales. Using GPS and time-depth loggers we studied the fine-scale foraging behaviour of central-place northern gannets Morus bassanus at two large colonies. First, we estimated the degree of consistency in individual foraging routes and sites across repeated trips. Second, we tested for individual differences in searching behaviour in response to environmental covariates using reaction norms, estimated from mixed effect models. Adult gannets tracked over multiple foraging trips showed repeatable between-individual differences in terminal points and departure angles of foraging trips, but low repeatability in trip duration and trip length. Importantly, individual birds showed highly repeatable dive locations, with consistently different environmental conditions (such as copepod abundance), suggesting a high degree of foraging site specialisation. Gannets also showed between-individual differences in searching behaviour along environmental gradients, such that individuals intensified searching under different conditions. Together these results suggest that widespread individual foraging consistency may represent specialisation and be linked with individual responses to environmental conditions. Such divergent searching behaviour could provide a mechanism by which consistent foraging behaviour arises and is maintained among animals that forage across large spatial scales.
Subfields: Ecology, Ecology, Evolution, Behavior and Systematics
View Paper: https://www.semanticscholar.org/paper/6b772c36647d86121307cc757485e62de254bd65
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Citations in the corpus
- Spatial scales of marine conservation management for breeding seabirds (2018, background): “This pattern is potentially because the largest gannet in our dataset, the Northern Gannet (Morus bassanus), which forages in temperate and productive waters, has mostly been tracked while feeding chicks [87-89], whereas the available data”
- Basking sharks and oceanographic fronts: quantifying associations in the north‐east Atlantic (2015, background): “…or interannual timescales (e.g. seals, Bradshaw et al. 2004; sharks, Pade et al. 2009; Queiroz et al. 2012; whales, Irvine et al. 2014; seabirds, Patrick et al. 2014), indicating that spatio-temporal predictability of prey encounter rates influences habitat selection across taxa (e.g. seabirds,…”
- Causes and consequences of individual variability and specialization in foraging and migration strategies of seabirds (2017, unknown): “X Grecian et al. (2016) √ ST- √, LT - √ ST - √, LT- √ Hamer et al. (2001, 2007), Wakefield et al. (2015) Hamer et al. (2001) √ ST - √ ST - √ Votier et al. (2010), Patrick et al. (2014) Soanes et al. (2013) Dur - √, Ret - √ Fifield et al. (2014) Pettex et al. (2012) (table continued on next 2…”