Abstract
Although grey seals (Halichoerus grypus) are the focus of considerable research effort throughout much of their North Atlantic breeding range, little is known about grey seal movement ecology in Iceland. This is surprising given the long history of grey seal exploitation in Iceland and because grey seals are common bycatch in commercial fisheries. Here, for the first time, we deployed satellite tags on five grey seals in Iceland to quantify the at-sea spatial usage of recently weaned pups during their first year of life. Maximum foraging trip distance ranged from 20 to 160 km for individual pups, while maximum duration ranged from 4.3 to 20.8 days. Individual differences in foraging trip metrics indicated two broad strategies. Specifically, pups either remained near the deployment location or dispersed to the east of Iceland, reaching a total distance of > 300 km from the deployment location. Foraging trips were, however, typically restricted to the continental shelf, which presumably reflects a preference for benthic foraging, as is reported for grey seals at other breeding locations. Our preliminary findings highlight the importance of near-shore waters to recently weaned grey seal pups in Iceland and suggests that coastal fisheries are a prevalent threat. However, additional research is required to quantify interactions between grey seals and commercial fisheries, which in turn, would improve the efficacy of conservation and management efforts.
References
Austin D, Bowen W, Mcmillan J, Boness D (2006) Stomach temperature telemetry reveals temporal patterns of foraging success in a free-ranging marine mammal. J Anim Ecol 75:408–420. https://doi.org/10.1111/j.1365-2656.2006.01057.x
Baylis AMM, Page B, Peters K et al (2005) The ontogeny of diving behaviour in New Zealand fur seal pups (Arctocephalus forsteri). Can J Zool 83:1149–1161. https://doi.org/10.1139/z05-097
Bennett KA, Speakman JR, Moss SEW et al (2007) Effects of mass and body composition on fasting fuel utilisation in grey seal pups (Halichoerus grypus: Fabricius): an experimental study using supplementary feeding. J Exp Biol 210:3043–3053. https://doi.org/10.1242/jeb.009381
Bennett KA, McConnell BJ, Moss S, Speakman J (2010) Effects of age and body mass on development of diving capabilities of gray seal pups: costs and benefits of the postweaning fast. Physiol Biochem Zool 83:911–923. https://doi.org/10.1086/656925
Bjorge A, Oien N, Hartvedt S, Bothun G (2002) Dispersal and bycatch mortality in gray, Halichoerus grypus, and harbor Phoca vitulina, seals tagged at the Norwegian coast. Mar Mammal Sci 18:963–976
Blanchet M-A, Lydersen C, Ims RA, Kovacs KM (2016) Making it through the first year: Ontogeny of movement and diving behavior in harbor seals from Svalbard, Norway. Mar Mammal Sci 32:1340–1369. https://doi.org/10.1111/mms.12341
Breed GA, Bowen WD, Leonard ML (2011) Development of foraging strategies with age in a long-lived marine predator. Mar Ecol Prog Ser 431:267–279. https://doi.org/10.3354/meps09134
Calenge C, Dray S, Royer-Carenzi M (2009) The concept of animals’ trajectories from a data analysis perspective. Ecol Inform 4:34–41. https://doi.org/10.1016/j.ecoinf.2008.10.002
Carter MID, Russell DJF, Embling CB et al (2017) Intrinsic and extrinsic factors drive ontogeny of early-life at-sea behaviour in a marine top predator. Sci Rep 7:1–14. https://doi.org/10.1038/s41598-017-15859-8
Costa DP, Robinson PW, Arnould J et al (2010) Accuracy of ARGOS locations of pinnipeds at-sea estimated using Fastloc GPS. PLoS ONE 5:e8677. https://doi.org/10.1371/journal.pone.0008677
Cotté C, Park Y-H, Guinet C, Bost C-A (2007) Movements of foraging king penguins through marine mesoscale eddies. Proc Biol Sci 274:2385–2391. https://doi.org/10.1098/rspb.2007.0775
Fowler SL, Costa DP, Arnould JPY et al (2006) Ontogeny of diving behaviour in the Australian sea lion: trials of adolescence in a late bloomer. J Anim Ecol 75:358–367. https://doi.org/10.1111/j.1365-2656.2006.01055.x
Freitas C, Lydersen C, Fedak MA, Kovacs KM (2008) A simple new algorithm to filter marine mammal Argos locations. Mar Mammal Sci 24:315–325. https://doi.org/10.1111/j.1748-7692.2007.00180.x
Gascoigne J, Daníelsson Á, Jagielo T (2017) Icelandic Gillnet Lumpfish Third Annual Surveillance Report
Granquist SM, Hauksson E (2019) Aerial census of the Icelandic grey seal (Halichoerus grypus) population in 2017: Pup production, population estimate, trends and current status. Marine and Freshwater Research Institute, Iceland HV 2019‐02
Hall AJ, McConnell BJ, Barker RJ (2001) Factors affecting first-year survival in grey seals and their implications for life history strategy. J Anim Ecol 70:138–149. https://doi.org/10.1046/j.1365-2656.2001.00468.x
Harwood J, Prime J (1978) Some factors affecting the size of British grey seal populations. J Appl Ecol 15:401–411
Hauksson E (2007) Abundance of grey seals in Icelandic waters, based on trends of pup-counts from aerial surveys. NAMMCO Sci Publ 6:85–97
Hauksson E, Bogason V (1997) Comparative feeding of grey (Halichoerus grypus) and common seals (Phoca vitulina) in coastal waters of Iceland, with a note on the diet of hooded (Cystophora cristata) and harp seals (Phoca groenlandica). J N Atl Fish Sci 22:125–135. https://doi.org/10.2960/J.v22.a11
Houston AI, Stephens PA, Boyd IL et al (2007) Capital or income breeding? A theoretical model of female reproductive strategies. Behav Ecol 18:241–250. https://doi.org/10.1093/beheco/arl080
Hunegnaw A, Siegismund F, Hipkin R, Mork KA (2009) Absolute flow field estimation for the nordic seas from combined gravimetric, altimetric, and in situ data. J Geophys Res Ocean 114:1–15. https://doi.org/10.1029/2008JC004797
Jenssen BM, Åsmul JI, Ekker M, Vongraven D (2010) To go for a swim or not? Consequences of neonatal aquatic dispersal behaviour for growth in grey seal pups. Anim Behav 80:667–673. https://doi.org/10.1016/j.anbehav.2010.06.028
Johnson D, London J, Lea M-A, Durban J (2008) Continuous-time correlated random walk model for animal telemetry data. Ecology 89:1208–1215
Linnebjerg JF, Frederiksen M, Kolbeinsson Y et al (2018) Non-breeding areas of three sympatric auk species breeding in three Icelandic colonies. Polar Biol 41:1951–1961. https://doi.org/10.1007/s00300-018-2334-1
Marine and Freshwater Research Institute (2018) Bycatch of seabirds and marine mammals in lumpsucker gillnets 2014–2017. Tech-report, p 16
McConnell B, Fedak M, Burton HR et al (2002) Movements and foraging areas of naïve, recently weaned southern elephant seal pups. J Anim Ecol 71:65–78
Noren SR, Boness DJ, Iverson SJ et al (2008) Body condition at weaning affects the duration of the postweaning fast in gray seal pups (Halichoerus grypus). Physiol Biochem Zool 81:269–277. https://doi.org/10.1086/528777
Oftedal OT, Boness DJ, Commission MM (1987) Current mammalogy Curr Mammal 1:175–245. https://doi.org/10.1007/978-1-4757-9909-5
Pálsson ÓK, Gunnlaugsson Þ, Ólafsdóttir D (2015) By-catch of seabirds and marine mammals in Icelandic Fisheries. Marine Research no 178. https://www.hafogvatn.is/static/research/files/fjolrit-178pdf
Raum-Suryan K, Rehberg M, Pendleton G et al (2004) Development of dispersal, movement patterns, and haul-out use by pup and juvenile Steller sea lions (Eumetopias jubatus) in Alaska. Mar Mammal Sci 20:823–850. https://doi.org/10.1111/j.1748-7692.2004.tb01195.x
Riotte-Lambert L, Weimerskirch H (2013) Do naive juvenile seabirds forage differently from adults? Proc R Soc B Biol Sci 280:20131434
Russell DJF, McClintock BT, Matthiopoulos J et al (2015) Intrinsic and extrinsic drivers of activity budgets in sympatric grey and harbour seals. Oikos 124:1462–1472. https://doi.org/10.1111/oik.01810
Sjöberg M, Ball JP (2000) Grey seal, Halichoerus grypus, habitat selection around haulout sites in the Baltic Sea: bathymetry or central-place foraging? Can J Zool 78:1661–1667. https://doi.org/10.1139/z00-108
Víkingsson GA, Pike DG, Valdimarsson H et al (2015) Distribution, abundance, and feeding ecology of baleen whales in Icelandic waters: have recent environmental changes had an effect ? Front Ecol Evol 3:1–18. https://doi.org/10.3389/fevo.2015.00006
Acknowledgements
We are grateful to Sigurður Líndal Þórisson (Icelandic Seal Center) for project support and logistics, Rachael Orben (Oregon State University) who assisted with field work, Erlingur Hauksson for discussions about grey seals in Iceland, and land owners at Drangar farm for site access and Guðlaugur A. Ágústsson for boat charter and logistical support. This research was partially funded by a Grant from the National Marine Aquarium UK to AMMB, and supported by 66° North, who generously supported the project with field equipment.
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Research was approved by the Icelandic Food and Veterinary Authority Animal Welfare Council, and conducted under permit MAST1608242 issued by the Icelandic Food and Veterinary Authority to AMMB.
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Baylis, A.M.M., Þorbjörnsson, J.G., dos Santos, E. et al. At-sea spatial usage of recently weaned grey seal pups in Iceland. Polar Biol 42, 2165–2170 (2019). https://doi.org/10.1007/s00300-019-02574-5
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DOI: https://doi.org/10.1007/s00300-019-02574-5