Foraging distribution of breeding northern fulmars is predicted by commercial fisheries
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Published Version
Date
2021
Authors
Darby, J. H.
De Grissac, S.
Arneill, G. E.
Pirotta, E.
Waggitt, J. J.
Börger, L.
Shepard, E.
Cabot, David
Owen, E.
Bolton, M.
Journal Title
Journal ISSN
Volume Title
Publisher
Inter-Research
Published Version
Abstract
Habitat-use and distribution models are essential tools of conservation biology. For wide-ranging species, such models may be challenged by the expanse, remoteness and variability of their habitat, these challenges often being compounded by the species' mobility. In marine environments, direct observations and sampling are usually impractical over broad regions, and instead remotely sensed proxies of prey availability are often used to link species abundance or foraging behaviour to areas that are expected to provide food consistently. One source of food consumed by many marine top predators is fisheries waste, but habitat-use models rarely account for this interaction. We assessed the utility of commercial fishing effort as a covariate in foraging habitat models for northern fulmars Fulmarus glacialis, a species known to exploit fisheries waste, during their summer breeding season. First, we investigated the prevalence of fulmar-vessel interactions using concurrently tracked fulmars and fishing vessels. We infer that over half of our study individuals associate with fishing vessels while foraging, mostly with trawl-type vessels. We then used hidden Markov models to explain the spatio-temporal distribution of putative foraging be - haviour as a function of a range of covariates. Persistent commercial fishing effort was a significant predictor of foraging behaviour, and was more important than commonly used environmental covariates retained in the model. This study demonstrates the effect of commercial fisheries on the foraging distribution and behaviour of a marine top predator, and supports the idea that, in some systems, incorporating human activities into distribution studies can improve model fit substantially © 2021 Inter-Research. All rights reserved.
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Keywords
Anthropogenic food source , Discards , Fisheries , Foraging behavior , Habitat use , Marine conservation
Citation
Darby, J.H., de Grissac, S., Arneill, G.E., Pirotta, E., Waggitt, J.J., Börger, L., Shepard, E., Cabot, D., Owen, E., Bolton, M. and Edwards, E.W. (2021) 'Foraging distribution of breeding northern fulmars is predicted by commercial fisheries', Marine Ecology Progress Series, 679, pp.181-194. https://doi.org/10.3354/meps13887