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PLOS ONE  2012 

Long-Term Species, Sexual and Individual Variations in Foraging Strategies of Fur Seals Revealed by Stable Isotopes in Whiskers

DOI: 10.1371/journal.pone.0032916

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Abstract:

Background Individual variations in the use of the species niche are an important component of diversity in trophic interactions. A challenge in testing consistency of individual foraging strategy is the repeated collection of information on the same individuals. Methodology/Principal Findings The foraging strategies of sympatric fur seals (Arctocephalus gazella and A. tropicalis) were examined using the stable isotope signature of serially sampled whiskers. Most whiskers exhibited synchronous δ13C and δ15N oscillations that correspond to the seal annual movements over the long term (up to 8 years). δ13C and δ15N values were spread over large ranges, with differences between species, sexes and individuals. The main segregating mechanism operates at the spatial scale. Most seals favored foraging in subantarctic waters (where the Crozet Islands are located) where they fed on myctophids. However, A. gazella dispersed in the Antarctic Zone and A. tropicalis more in the subtropics. Gender differences in annual time budget shape the seal movements. Males that do not perform any parental care exhibited large isotopic oscillations reflecting broad annual migrations, while isotopic values of females confined to a limited foraging range during lactation exhibited smaller changes. Limited inter-individual isotopic variations occurred in female seals and in male A. tropicalis. In contrast, male A. gazella showed large inter-individual variations, with some males migrating repeatedly to high-Antarctic waters where they fed on krill, thus meaning that individual specialization occurred over years. Conclusions/Significance Whisker isotopic signature yields unique long-term information on individual behaviour that integrates the spatial, trophic and temporal dimensions of the ecological niche. The method allows depicting the entire realized niche of the species, including some of its less well-known components such as age-, sex-, individual- and migration-related changes. It highlights intrapopulation heterogeneity in foraging strategies that could have important implications for likely demographic responses to environmental variability.

References

[1]  Hutchinson GE (1957) Concluding remarks. Cold Spring Harbor Symp Quantit Biol 22: 415–427.
[2]  Bearhop S, Adams CE, Waldron S, Fuller RA, MacLeod H (2004) Determining trophic niche width: a novel approach using stable isotope analysis. J Anim Ecol 73: 1007–1012.
[3]  Pianka ER (1969) Sympatry of desert lizards (Ctenotus) in western Australia. Ecology 50: 1012–30.
[4]  Schoener TW (1974) Resource partitioning in ecological communities. Science 185: 27–38.
[5]  Begon M, Townsend CR, Harper JL (2006) Ecology: From individuals to ecosystems. Blackwell Publishing, Malden.
[6]  Polis G (1984) Age structure component of niche width and intraspecific resource partitioning: can age groups function as ecological species? Am Nat 123: 541–564.
[7]  Shine R (1989) Ecological causes for the evolution of sexual dimorphism: a review of the evidence. Quart Rev Biol 64: 419–461.
[8]  Smith TB, Skulason S (1996) Evolutionary significance of resource polymorphisms in fishes, amphibians, and birds. Ann Rev Ecol Syst 27: 111–133.
[9]  Bolnick D, Svanback R, Fordyce J, Yang L, Davis J, et al. (2003) The ecology of individuals: incidence and implications of individual specialization. Am Nat 161: 1–28.
[10]  Newsome SD, Tinker MT, Monson DH, Oftedal OT, Ralls K, et al. (2009) Using stable isotopes to investigate individual diet specialization in California sea otters (Enhydra lutris nereis). Ecology 90: 961–974.
[11]  Newsome SD, Martinez del Rio C, Bearhop S, Phillips DL (2007) A niche for isotopic ecology. Front Ecol Environ 5: 429–436.
[12]  McCutchan JH, Lewis WM, Kendall C, McGrath CC (2003) Variation in trophic shift for stable isotope ratios of carbon, nitrogen, and sulfur. Oikos 102: 378–390.
[13]  Hobson KA, Piatt JF, Pitocchelli J (1994) Using stable isotopes to determine seabird trophic relationships. J Anim Ecol 63: 786–798.
[14]  Cherel Y, Hobson KA (2007) Geographical variation in carbon stable isotope signatures of marine predators: a tool to investigate their foraging areas in the Southern Ocean. Mar Ecol Prog Ser 329: 281–287.
[15]  Rubenstein DR, Hobson KA (2004) From birds to butterflies: animal movement patterns and stable isotopes. Trends Ecol Evol 19: 256–263.
[16]  Newsome SD, Clementz MT, Koch PL (2010) Using stable isotope biogeochemistry to study marine mammal ecology. Mar Mammal Sci 26: 509–572.
[17]  Bailleul F, Luque S, Dubroca L, Arnould JPY, Guinet C (2005) Differences in foraging strategy and maternal behaviour between two sympatric fur seal species at the Crozet islands. Mar Ecol Prog Ser 293: 273–282.
[18]  Staniland I (2005) Sexual segregation in seals. In: Ruckstuhl KE, Neuhaus P, editors. Sexual segregation in vertebrates: ecology of the two sexes. Cambridge University Press, Cambridge. pp. 53–73.
[19]  Page B, McKenzie J, Goldsworthy SD (2005) Inter-sexual differences in New Zealand fur seal diving behaviour. Mar Ecol Prog Ser 304: 249–264.
[20]  Staniland I, Robinson SL (2008) Segregation between the sexes: Antarctic fur seals, Arctocephalus gazella, foraging at South Georgia. Anim Behav 75: 1581: 1590.
[21]  Boyd IL, McCafferty DJ, Reid K, Taylor R, Walker TR (1998) Dispersal of male and female Antarctic fur seals (Arctocephalus gazella). Can J Aquat Sci 55: 845–852.
[22]  Boyd IL, Staniland IJ, Martin AR (2002) Distribution of foraging by female Antarctic fur seals. Mar Ecol Prog Ser 242: 285–284.
[23]  Cherel Y, Hobson KA, Guinet C, Vanpé C (2007) Stable isotopes document seasonal changes in trophic niches and winter foraging individual specialization in diving predators from the Southern Ocean. J Anim Ecol 76: 826–836.
[24]  Arnould JPY, Cherel Y, Gibbens J, White JG, Littnan CL (2011) Stable isotopes reveal inter-annual and inter-individual variation in the diet of female Australian fur seals. Mar Ecol Prog Ser 422: 291–302.
[25]  Hirons AC, Schell DM, St Aubin DJ (2001) Growth rates of vibrissae of harbor seals (Phoca vitulina) and Steller sea lions (Eumetobias jubatus). Can J Zool 79: 1053–1061.
[26]  Cherel Y, Kernaléguen L, Richard P, Guinet C (2009) Whisker isotopic signature depicts migration patterns and multi-year intra- and inter-individual foraging strategies in fur seals. Biol Lett 5: 830–832.
[27]  Kingston JJ, Gwilliam J (2007) Hybridization between two sympatrically breeding species of fur seal at Iles Crozet revealed by genetic analysis. Conserv Genet 8: 1133–1145.
[28]  Arnould JPY, Boyd IL, Speakman JR (1996) Measuring the body composition of Antarctic fur seals (Arctocephalus gazella): validation of hydrogen isotope dilution. Physiol Zool 69: 93–116.
[29]  Hobson KA, Schell DM, Renouf D, Noseworthy E (1996) Stable carbon and nitrogen isotopic fractionation between diet and tissues of captive seals: implications for dietary reconstructions involving marine mammals. Can J Fish Aquat Sci 53: 528–533.
[30]  Jaeger A, Lecomte VJ, Weimerskirch H, Richard P, Cherel Y (2010) Seabird satellite tracking validates the use of latitudinal isoscapes to depict predators' foraging areas in the Southern Ocean. Rapid Comm Mass Spectr 24: 3456–3460.
[31]  Pinheiro JC, Bates DM (2000) Mixed-effects models in S and S-PLUS. Springer, New York.
[32]  Torrence C, Compo GP (1998) A practical guide to wavelet analysis. Bull Am Meteor Soc 79: 61–78.
[33]  Cazelles B, Chavez M, Berteaux D, Ménard F, Vik JO, et al. (2008) Wavelet analysis of ecological time series. Oecologia 156: 287–304.
[34]  Cazelles B, Stone L (2003) Detection of imperfect population synchrony in an uncertain world. J Anim Ecol 72: 953–968.
[35]  Vander Zanden HB, Bjorndal KA, Reich KJ, Bolten AB (2010) Individual specialists in a generalist population: results from a long-term stable isotope series. Biol Lett 6: 711–714.
[36]  Iacumin P, Davanzo S, Nikolaev V (2005) Short-term climatic changes recorded by mammoth hair in the Arctic environment. Paleogeogr, Paleoclimat, Paleoecol 218: 317–324.
[37]  Cerling TE, Wittemyer G, Ehleringer JR, Remien CH, Douglas-Hamilton I (2009) History of animals using isotope records (HAIR): a 6-year dietary history of one family of African elephants. Proc Nat Acad Sci 106: 8093–8100.
[38]  Tiunov AV, Kirillova IV (2010) Stable isotope (13C/12C and 15N/14N) composition of the woolly rhinoceros Coelodonta antiquitatis horn suggests seasonal changes in the diet. Rapid Comm Mass Spectr 24: 3146–3150.
[39]  Best PB, Schell DM (1996) Stable isotopes in southern right whale (Eubalaena australis) baleen as indicators of seasonal movements, feeding and growth. Mar Biol 124: 483–494.
[40]  Zhao L, Schell DM (2004) Stable isotope ratios in harbour seal Phoca vitulina vibrissae: effects of growth patterns on ecological records. Mar Ecol Prog Ser 281: 267–273.
[41]  Cherel Y, Hobson KA, Bailleul F, Groscolas R (2005) Nutrition, physiology, and stable isotopes: new information from fasting and molting penguins. Ecology 86: 2881–2888.
[42]  Fuller BT, Fuller JL, Sage NE, Harris DA, O'Connell TC, et al. (2005) Nitrogen balance and δ15N: why you're not what you eat during nutritional stress. Rapid Comm Mass Spectr 19: 2497–2506.
[43]  Fuller BT, Fuller JL, Sage NE, Harris DA, O'Connell TC, et al. (2004) Nitrogen balance and δ15N: why you're not what you eat during pregnancy. Rapid Comm Mass Spectr 18: 2889–2896.
[44]  Wickens P, York AE (1997) Comparative population dynamics of fur seals. Mar Mammal Sci 13: 241–292.
[45]  Cherel Y, Weimerskirch H, Trouvé C (2002) Dietary evidence for spatial foraging segregation in sympatric albatrosses (Diomedea spp.) rearing chicks at Iles Nuageuses, Kerguelen. Mar Biol 141: 1117–1129.
[46]  Gonzalez-Solis J, Croxall JP, Afanasyev V (2008) Offshore spatial segregation in giant petrels Macronectes spp.: differences between species, sexes and seasons. Aquat Conserv: Mar Freshwater Ecosyst 17: S22–S36.
[47]  Jaeger A, Connan M, Richard P, Cherel Y (2010) Use of stable isotopes to quantify seasonal changes of trophic niche and levels of population and individual specialisation in seabirds. Mar Ecol Prog Ser 401: 269–277.
[48]  Green K (1997) Diving behaviour of Antarctic fur seals Arctocephalus gazella Peters around Heard Island. Mar Mammal Res Southern Hemisphere 1: 97–104.
[49]  Green K, Williams R, Burton HR (1997) Foraging ecology of Antarctic fur seals Arctocephalus gazella Peters around Heard Island. Mar Mammal Res Southern Hemisphere 1: 105–113.
[50]  Higdon JW, Bininda-Emonds ORP, Beck RMD, Ferguson SH (2007) Phylogeny and divergence of the pinnipeds (Carnivora: Mammalia) assessed using a multigene dataset. BMC Evol Biol 7: 216.
[51]  Cherel Y, Phillips RA, Hobson KA, McGill R (2006) Stable isotope evidence of diverse species-specific and individual wintering strategies in seabirds. Biol Lett 2: 301–303.
[52]  Bearhop S, Phillips RA, Thompson DR, Waldron S, Furness RW (2000) Variability in mercury concentrations of great skuas Catharacta skua: the influence of colony, diet and trophic status inferred from stable isotope signatures. Mar Ecol Prog Ser 195: 261–268.
[53]  Bradshaw CJA, Hindell MA, Sumner MD, Michael KJ (2004) Loyalty pays: potential life history consequences of fidelity to marine foraging regions by southern elephant seals. Anim Behav 68: 1349–1360.
[54]  Phillips RA, Silk JRD, Croxall JP, Afanasyev V, Bennett VJ (2005) Summer distribution and migration of nonbreeding albatrosses: individual consistencies and implications for conservation. Ecology 86: 2386–2396.
[55]  Quillfeldt P, Voigt CC, Masello JF (2010) Plasticity versus repeatability in seabird migratory behaviour. Behav Ecol Sociobiol 64: 1157–1164.
[56]  Lowther AD, Harcourt RG, Hamer DJ, Goldsworthy SD (2011) Creatures of habit: foraging habitat fidelity of adult female Australian sea lions. Mar Ecol Prog Ser 443: 249–263.

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