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Classifying grey seal behaviour in relation to environmental variability and commercial fishing activity - a multivariate hidden Markov model

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Author(s)

Floris M. van Beest, Sina Mews, Svenja Elkenkamp, Patrick Schuhmann, Dorian Tsolak, Till Wobbe, Valerio Bartolino, Francois Bastardie, Rune Dietz, Christian von Dorrien, Anders Galatius, Olle Karlsson, Bernie McConnell, Jacob Nabe-Nielsen, Morten Tange Olsen, Jonas Teilmann, Roland Langrock

School/Research organisations

Abstract

Classifying movement behaviour of marine predators in relation to anthropogenic activity and environmental conditions is important to guide marine conservation. We studied the relationship between grey seal (Halichoerus grypus) behaviour and environmental variability in the southwestern Baltic Sea where seal-fishery conflicts are increasing. We used multiple environmental covariates and proximity to active fishing nets within a multivariate hidden Markov model (HMM) to quantify changes in movement behaviour of grey seals while at sea. Dive depth, dive duration, surface duration, horizontal displacement, and turning angle were used to identify travelling, resting and foraging states. The likelihood of seals foraging increased in deeper, colder, more saline waters, which are sites with increased primary productivity and possibly prey densities. Proximity to active fishing net also had a pronounced effect on state occupancy. The probability of seals foraging was highest <5 km from active fishing nets (51%) and decreased as distance to nets increased. However, seals used sites <5 km from active fishing nets only 3% of their time at sea highlighting an important temporal dimension in seal-fishery interactions. By coupling high-resolution oceanographic, fisheries, and grey seal movement data, our study provides a scientific basis for designing management strategies that satisfy ecological and socioeconomic demands on marine ecosystems.
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Details

Original languageEnglish
Article number5642
Number of pages14
JournalScientific Reports
Volume9
DOIs
Publication statusPublished - 4 Apr 2019

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