Impact of diet-index selection and the digestion of prey hard remains on determining the diet of the Steller sea lion (Eumetopias jubatus)

Canadian Journal of Zoology

Volumn 85, Issue 1, 2007, Pages 1-15

  Tollit, D J ^a   Heaslip, S G ^a,b   Barrick, R L ^a   Trites, A W ^a  

^a UNIVERSITY OF BRITISH COLUMBIA   (Canada)

^b UNIVERSITY OF ST ANDREWS   (United Kingdom)

Author keywords

[No Author keywords available]

Indexed keywords

ANALYSIS OF VARIANCE (ANOVA); BIODIVERSITY; DIGESTIVE SYSTEM; FOOD PRODUCTS; NUTRITION;

DIET INDEX SELECTION; DIGESTION; PREY HARD REMAINS; SEA LIONS;

MAMMALS;

BIOMASS; CAPTIVE POPULATION; DIGESTION; FEEDING BEHAVIOR; INDEX METHOD; INTERSPECIFIC VARIATION; OTOLITH; PINNIPED; SALMONID; VARIANCE ANALYSIS;

CEPHALOPODA; CLUPEA PALLASI; CLUPEIDAE; EUMETOPIAS JUBATUS; OTARIIDAE; SALMONIDAE;

EID: 34248547252     PISSN: 00084301     EISSN: None     Source Type: Journal    
DOI: 10.1139/Z06-174     Document Type: Article

References (52)

1. Bigg, M.A., and Fawcett, I. 1985. Two biases in diet determination of northern fur seals (Callorhinus ursinus). In Marine mammals and fisheries. Edited by J.R. Beddington, R.J.H. Beverton, and D.M. Lavigne. George Allen and Unwin Ltd., London. pp. 284-291.
2. Bowen, W.D. 2000. Reconstruction of pinniped diets: accounting for complete digestion of otoliths and cephalopod beaks. Can. J. Fish. Aquat. Sci. 57: 898-905. doi:10.1139/cjfas-57-5-898.
3. Bowen, W.D., Lawson, J.W., and Beck, B. 1993. Seasonal and geographic variation in the species composition and size of prey consumed by grey seals (Halichoerus grypus) on the Scotian shelf. Can. J. Fish. Aquat. Sci. 50: 1768-1778.
4. Bowen, W.D., Tully, D., Boness, D.J., Bulheier, B., and Marshall, G. 2002. Prey-dependent foraging tactics and prey profitability in a marine mammal. Mar. Ecol. Prog. Ser. 244: 235-245.
5. Browne, P., Laake, J.L., and DeLong, R.L. 2002. Improving pinniped diet analyses through identification of multiple skeletal structures in fecal samples. Fish. Bull. (Wash., D.C.), 100: 423-433.
6. Casper, R.M., Gales, N.J., Hindell, M.A., and Robinson, S.M. 2006. Diet estimation based on an integrated mixed prey feeding experiment using Arctocephalus seals. J. Exp. Mar. Biol. Ecol. 328: 228-239. doi:10.1016/j.jembe.2005.07.009.
7. Cottrell, P.E., and Trites, A.W. 2002. Classifying prey hard part structures recovered from fecal remains of captive Steller sea lions (Eumetopias jubatus). Mar. Mamm. Sci. 18: 525-539.
8. Cottrell, P.E., Trites, A.W., and Miller, E.H. 1996. Assessing the use of hard parts in faeces to identify harbour seal prey: results of captive-feeding trials. Can. J. Zool. 74: 875-880.
9. Deagle, B.E., and Tollit, D.J. 2007. Quantitative analysis of prey DNA in pinniped faeces: potential to estimate diet composition? Conserv. Genet. In press. doi:10.1007/s10592-006-9197-7.
10. Deagle, B.E., Tollit, D.J., Jarman, S.N., Hindell, M.A., Trites, A.W., and Gales, N.J. 2005. Molecular scatology as a tool to study diet: analysis of prey DNA in scats from captive Steller sea lions. Mol. Ecol. 14: 1831-1842. doi:10.1111/j.1365-294X. 2005.02531.x. PMID:15836654.
11. Dellinger, T., and Trillmich, F. 1988. Estimating diet composition from scat analysis in otariid seals (Otariidae): is it reliable? Can. J. Zool. 66: 1865-1870.
12. Fea, N.I., Harcourt, R., and Lalas, C. 1999. Seasonal variation in the diet of New Zealand fur seals (Arctocephalus forsteri) at Otago Peninsula, New Zealand. Wildl. Res. 26: 147-160. doi:10.1071/WR98024.
13. Frost, K.J., and Lowry, L.F. 1980. Feeding of ribbon seals (Phoca fasciata) in the Bering Sea in spring. Can. J. Zool. 58: 1601-1607.
14. Gales, N.J., and Cheal, A.J. 1992. Estimating diet composition of the Australian sea-lion (Neophoca cinerea) from scat analysis: an unreliable technique. Wildl. Res. 19: 447-451. doi:10.1071/ WR9920447.
15. Grellier, K. 2006. Grey seal diet in the North Sea. Ph.D. thesis, Sea Mammal Research Unit, University of St Andrews, Scotland, UK.
16. Gudmundson, C.J., Zeppelin, T.K., and Ream, R.R. 2006. Application of two methods for determining diet in northern fur seals (Callorhinus ursinus). Fish. Bull. (Wash., D.C.), 104: 445-455.
17. Hammond, P.S., and Rothery, P. 1996. Application of computer sampling in the estimation of seal diet. J. Appl. Stat. 23: 525-533.
18. Harvey, J.T. 1989. Assessment of errors associated with harbor seal (Phoca vitulina) fecal sampling. J. Zool. (Lond.), 219: 101-111.
19. Higgins, L.V., Costa, D.P., Huntlet, A.C., and LeBoeuf, B.J. 1988. Behavioural and physiological measurements of maternal investment in the Steller sea lion Eumetopias jubatus. Mar. Mamm. Sci. 4: 44-58.
20. Iverson, S.J., Field, C., Bowen, W.D., and Blanchard, W. 2004. Quantitative fatty acid signature analysis: a new method of estimating predator diets. Ecol. Monogr. 72: 211-235.
21. Jarman, S.N., Deagle, B.E., and Gales, N.J. 2004. Group-specific polymerase chain reaction for DNA-based analysis of species diversity and identity in dietary samples. Mol. Ecol. 13: 1313-1322. doi:10.1111/j.1365-294X.2004.02109.x. PMID:15078466.
22. Joy, R., Tollit, D.J., Laake, J.L., and Trites, A.W. 2006. Using feeding trials and computer simulations to reconstruct pinniped diet from scat. In Sea lions of the world. Edited by A.W. Trites, S., Atkinson, D.P., DeMaster, L.W., Fritz, T.S., Gelatt, L.D. Rea, and K. Wynne. Alaska Sea Grant College Program, University of Alaska, Fairbanks. pp. 205-222.
23. Kaneko, H., and Lawler, I.R. 2006. Can near infrared spectroscopy be used to improve assessment of marine mammal diets via fecal analysis? Mar. Mamm. Sci. 22: 261-275.
24. Kirkman, S.P., Wilson, W., Klages, N.T.W., Bester, M.N., and Isaksen, K. 2000. Diet and estimated food consumption of Antarctic fur seals at Bouvetøya during summer. Polar Biol. 23: 745-752. doi:10.1007/s003000000145.
25. Kiyota, M., Kawai, C., and Baba, N. 1999. Estimation of diet of male northern fur seals (Callorhinus ursinus) based on the analysis of fecal and regurgitated materials. Bull. Natl. Res. Inst. Far Seas Fish. 36: 1-7. [In Japanese with English title and abstract.]
26. Kvitrud, M.A., Reimer, S.D., Brown, R.F., Bellinger, M.R., and Banks, M.A. 2005. Pacific harbor seals (Phoca vitulina) and salmon: genetics presents hard numbers for elucidating predator-prey dynamics. Mar. Biol. (Berl.), 147: 1459-1466.
27. Laake, J.L., Browne, P., DeLong, R.L., and Huber, H.R. 2002. Pinniped diet composition: a comparison of estimation indices. Fish. Bull. (Wash., D.C.), 100: 434-477.
28. Loughlin, T.R., Perlov, A.S., and Vladimirov, V.A. 1992. Range-wide survey and estimation of total number of Steller sea lions in 1989. Mar. Mamm. Sci. 8: 220-239.
29. Marcus, J., Bowen, W.D., and Eddington, J.D. 1998. Effects of meal size on otolith recovery from fecal samples of gray and harbor seal pups. Mar. Mamm. Sci. 14: 789-802.
30. Merrick, R.L., Chumbley, M.K., and Byrd, G.V. 1997. Diet diversity of Steller sea lions (Eumetopias jubatus) and their population decline in Alaska: a potential relationship. Can. J. Fish. Aquat. Sci. 54: 1342-1348. doi:10.1139/cjfas-54-6-1342.
31. Olesiuk, P.F. 1993. An annual prey consumption by harbour seals (Phoca vitulina) in the Strait of Georgia, British Columbia. Fish. Bull. (Wash., D.C.), 91: 491-515.
32. Olesiuk, P.F., Bigg, M.A., Ellis, G.M., Crockford, S.J., and Wigen, R.J. 1990. An assessment of the feeding habits of harbour seals (Phoca vitulina) in the Strait of Georgia British Columbia based on scat analysis. Can. Tech. Rep. Fish. Aquat. Sci. No. 1730.
33. Orr, A.J., and Harvey, J.T. 2001. Quantifying errors associated with using fecal samples to determine the diet of the California sea lion (Zalophus californianus). Can. J. Zool. 79: 1080-1087. doi:10.1139/cjz-79-6-1080.
34. Pierce, G.J., and Boyle, P.R. 1991. A review of methods for diet analysis in piscivorous marine mammals. Oceanogr. Mar. Biol. Annu. Rev. 29: 409-486.
35. Prime, J.H., and Hammond, P.S. 1987. Quantitative assessment of gray seal diet from fecal analysis. In Approaches to marine mammal energetics. Edited by A.C. Huntley, D.P. Costa, G.A.J. Worthy, and M.A. Castellini. Spec. Publ. No. 1. Society for Marine Mammalogy, Allen Press, Lawrence, Kans. pp. 165-181.
36. Purcell, M., Mackey, G., LaHood, E., Park, L., and Huber, H.R. 2004. Molecular methods for the genetic identification of salmonid prey from Pacific harbour seal (Phoca vitulina richardsi) scat. Fish. Bull. (Wash., D.C.), 102: 213-220.
37. Ringrose, T.J. 1993. Bone counts and statistics: a critique. J. Archaeol. Sci. 20: 121-157. doi:10.1006/jasc.1993.1010.
38. Sinclair, E.H., and Zeppelin, T.K. 2002. Seasonal and spatial differences in diet in the western stock of Steller sea lions (Eumetopias jubatus). J. Mammal. 83: 973-990. doi:10.1644/1545-1542(2002)083〈0973: SASDID〉2.0.CO;2.
39. Staniland, I.J. 2002. Investigating the biases in the use of hard prey remains to identify diet composition using Antarctic fur seals (Arctocephalus gazella) in captive feeding trials. Mar. Mamm. Sci. 18: 223-243.
40. Tollit, D.J., and Thompson, P.M. 1996. Seasonal and between-year variations in the diet of harbour seals in the Moray Firth, Scotland. Can. J. Zool. 74: 1110-1121.
41. Tollit, D.J., Steward, M.J., Thompson, P.M., Pierce, G.J., Santos, M.B., and Hughes, S. 1997. Species and size differences in the digestion of otoliths and beaks: implications for estimates of pinniped diet composition. Can. J. Fish. Aquat. Sci. 54: 105-119. doi:10.1139/cjfas-54-1-105.
42. Tollit, D.J., Wong, M., Winship, A.J., Rosen, D.A.S., and Trites, A.W. 2003. Quantifying errors associated with using prey skeletal structures from fecal samples to determine the diet of the Steller sea lion (Eumetopias jubatus). Mar. Mamm. Sci. 19: 724-744.
43. Tollit, D.J., Heaslip, S.G., and Trites, A.W. 2004a. Sizes of walleye pollock (Theragra chalcogramma) consumed by the eastern stock of Steller sea lions (Eumetopias jubatus) in Southeast Alaska from 1994 to 1999. Fish. Bull. (Wash., D.C.), 102: 522-532.
44. Tollit, D.J., Heaslip, S.G., Zeppelin, T.K., Joy, R., Call, K.A., and Trites, A.W. 2004b. A method to improve size estimates of walleye pollock (Theragra chalcogramma) and Atka mackerel (Plurogrammus monopterygius) consumed by pinnipeds: digestion correction factors applied to bones and otoliths recovered in scats. Fish. Bull. (Wash., D.C.), 102: 498-508.
45. Tollit, D.J., Heaslip, S.G., Deagle, B.E., Iverson, S.J., Joy, R., Rosen, D.A.S., and Trites, A.W. 2006. Estimating diet composition in sea lions: which technique to choose? In Sea lions of the world. Edited by A.W. Trites, S. Atkinson, D.P., DeMaster, L.W. Fritz, T.S., Gelatt, L.D. Rea, and K. Wynne. Alaska Sea Grant College Program, University of Alaska, Fairbanks, pp. 293-307.
46. Trites, A.W., and Joy, R. 2005. Dietary analysis from fecal samples: how many scats are enough? J. Mammal. 86: 704-712. doi:10.1644/1545- 1542(2005)086[0704:DAFFSH]2.0.CO;2.
47. Trites, A.W., and Larkin, P.A. 1996. Changes in the abundance of Steller sea lions (Eumetopias jubatus) in Alaska from 1956 to 1992: how many were there? Aquat. Mamm. 22: 153-166.
48. Trites, A.W., Calkins, D.G., and Winship, A.J. 2007. Diet of Steller sea lions (Eumetopias jubatus) in Southeast Alaska from 1993-1999. Fish. Bull. (Wash., D.C.). In press.
49. Winship, A.J., and Trites, A.W. 2003. Prey consumption of Steller sea lions (Eumetopias jubatus) off Alaska: how much prey do they require? Fish. Bull. (Wash., D.C.), 101: 147-163.
50. Yonezaki, S., Kiyota, M., Baba, N., Koido, T., and Takemura, A. 2003. Size distribution of the hard remains of prey in the digestive tract of northern fur seal (Callorhinus ursinus) and related biases in diet estimation by scat analysis. Mamm. Study, 28: 97-102.
51. Zar, J.H. 1984. Biostatistical Analysis. 2nd ed. Prentice-Hall Inc., Englewood Cliffs, N.J.
52. Zeppelin, T.K., Tollit, D.J., Call, K.A., Orchard, T.J., and Gudmundson, C.J. 2004. Sizes of walleye pollock (Theragra chalcogramma) and Atka mackerel (Plurogrammus monopterygius) consumed by pinnipeds the western stock of Steller sea lions (Eumetopias jubatus) in Alaska from 1998 to 2000. Fish. Bull. (Wash., D.C.), 102: 509-521.