Bromaghin ei al Diets of Phoca vitulina in the Salish Sea revealed by analysis of fatty acid signatures 
25 
E. Sala, T. W. Schmidt, G. R. Sedberry, H. Weeks, and S. G. 
Wright. 
2001. Marine, estuarine, and diadromous fish stocks at 
risk of extinction in North America (exclusive of Pacific 
salmonids). Fisheries 25:6-30. 
Nordstrom, C. A., L. J. Wilson, S. J. Iverson, and D. J. Tollit. 
2008 Evaluating quantitative fatty acid signature anal- 
ysis (QFASA) using harbour seals Phoca vitulina rich- 
ardsi in captive feeding studies. Mar. Ecol. Prog. Ser. 
360:245-263. 
Olesiuk, P. F. 
1993. Annual prey consumption by harbor seals (Ph- 
oca vitulina) in the Strait of Georgia, British Colum- 
bia. Fish. Bull. 91:491-515. 
Orr, A. J., A. S. Banks, S. Mellman, H. R. Huber, R. L. DeLong, 
and R. F. Brown. 
2004. Examination of the foraging habits of Pacific har- 
bor seal (Phoca vitulina richardsi ) to describe their use 
of the Umpqua River, Oregon, and their predation on 
salmonids. Fish. Bull. 102:108-117. 
Peterson, S. H., M. M. Lance, S. J. Jeffries, and A. 
Acevedo-Gutierrez. 
2012. Long distance movements and disjunct spa- 
tial use of harbor seals (Phoca vitulina) in the in- 
land waters of the Pacific Northwest. PLoS ONE 
7(6):e39046. doi:l 0.137 1/journal, pone. 0039046 
Phillips, D. L. 
2001. Mixing models in analyses of diet using multiple 
stable isotopes: A critique. Oecologia 127:166-170. 
Phillips, E. M., and J. T. Harvey. 
2009. A captive feeding study with the Pacific harbor 
seal (Phoca vitulina richardsii ): Implications for scat 
analysis. Mar. Mamm. Sci. 25:373-391. 
Quinn, T. P. 
2005. The behavior and ecology of Pacific salmon and 
trout. Univ. Washington Press, Seattle, WA. 
R Development Core Team. 
2009. R: A language and environment for statistical 
computing. R Foundation for Statistical Computing, Vi- 
enna, Austria. [Available from http://www.R-project.org/, 
accessed August 2011.] 
Roper, C. F. E., M. J. Sweeney, and C. E. Nauen. 
1984. FAO species catalogue. Vol. 3. Cephalopods of the 
world: an annotated and illustrated catalogue of species 
of interest to fisheries. FAO Fish. Synop. 125, vol. 3, 
277 p. 
Scheffer, V. B„ and J. W. Slipp. 
1944. The harbor seal in Washington State. Am. Midi. 
Nat. 32:373-416. 
Schmitz, O. J., D. Hawlena, and G. C. Trussed. 
2010. Predator control of ecosystem nutrient dynam- 
ics. Ecol. Lett. 13:1199-1209. 
Sergio, F., I. Newton, L. Marchesi, and P. Pedrini. 
2006. Ecologically justified charisma: Preservation of top 
predators delivers biodiversity conservation. J. Appl. 
Ecol. 43:1049-1055. 
Stasko, A.B., R. M. Horrel, and A. D. Hasler. 
1976. Coastal movements of adult Fraser River salmon 
(Oncorhynchus nerka) observed by ultrasonic track- 
ing. Trans. Am. Fish. Soc. 105:64-74. 
Suryan, R. M., and J. T. Harvey. 
1998. Tracking harbor seals ( Phoca vitulina richardsi) to 
determine dive behavior, foraging activity, and haul-out 
site use. Mar. Mamm. Sci. 14:361-372. 
Therriault, T.W., D. E. Hay, and J. F. Schweigert. 
2009. Biological overview and trends in pelagic forage 
fish abundance in the Salish Sea (Strait of Georgia, 
British Columbia). Mar. Ornithol. 37: 3-8. 
Thiemann, G. W., S. J. Iverson, and I. Stirling. 
2008. Polar bear diets and arctic marine food webs: 
insights from fatty acid analysis. Ecol. Monogr. 
78:591-613. 
Thomas, A. C., M. M. Lance, S. J. Jeffries, B. G. Miner, and A. 
Acevedo-Gutierrez. 
2011. Harbor seal foraging response to a seasonal re- 
source pulse, spawning Pacific herring. Mar. Ecol. 
Prog. Ser. 441:225-239. 
Tollit, D. J., A. D. Black, P. M. Thompson, A. Mackay, H. 
M. Corpe, B. Wilson, S. M. Van Parijs, K. Grellier, and S. 
Parlane. 
1998. Variations in harbour seal ( Phoca vitulina ) diet 
and dive-depths in relation to foraging habitat. J. Zool. 
244:209-222. 
Tollit, D. J., S. G. Heaslip, R. Joy, K. A. Call, and A. W. Trites. 
2004. A method to improve size estimates of Walleye 
pollock ( Theragra chalcogramma) and Atka mackerel 
(Pleurogrammus monopterygius) consumed by pinni- 
peds: digestion correction factors applied to bones and 
otoliths recovered in scats. Fish. Bull. 102:498-508. 
Tollit, D. J., M. J. Steward, P. M. Thompson, G. J. Pierce, M. B. 
Santos, and S. Hughes. 
1997. Species and size differences in the digestion of oto- 
liths and beaks: implications for estimates of pinniped 
diet composition. Can. J. Fish. Aquat. Sci. 54:105-119. 
Trites, A. W., and R. Joy. 
2005. Dietary analysis from fecal samples: How many 
scats are enough? J. Mammal. 86:704-712. 
Tucker, S., W. D. Bowen, and S. J. Iverson. 
2008. Convergence of diet estimates derived from fat- 
ty acids and stable isotopes within individual grey 
seals. Mar. Ecol. Prog. Ser. 354:267-276. 
Venables, W. N., and B. D. Ripley. 
2002. Modern applied statistics with S, 4 th ed., 512 p. 
Springer, New York. 
Walton, M. J., R. J. Henderson, and P. P. Pomeroy. 
2000. Use of blubber fatty acid profiles to distinguish di- 
etary differences between grey seals Halichoerus grypus 
from two LTK breeding colonies. Mar. Ecol. Prog. Ser. 
193:201-208. 
Walton, M., and P. Pomeroy. 
2003. Use of blubber fatty acid profiles to detect inter- 
annual variations in the diet of gray seals Halichoerus 
grypus. Mar. Ecol. Prog. Ser. 248:257-266. 
Williams, C. T., S. J. Iverson, and C. L. Buck. 
2009. The effects of diet and caloric restriction on 
adipose tissue fatty acid signatures of tufted puffin 
(Fratercula cirrhata) nestlings. J. Comp. Physiol., B 
179:711-720. 
Williams, T. M., J. A. Estes, D. F. Doak, and A. M. Springer. 
2004. Killer appetites: Assessing the role of predators in 
ecological communities. Ecology 85:3373-3384. 
Williams, G. D., P. S. Levin, and W. A. Palsson. 
2010. Rockfish in Puget Sound: an ecological history of 
exploitation. Marine Policy 34:1010-1020. 
Willson, M. F., and J. N. Womble. 
2006. Vertebrate exploitation of pulsed marine prey: a 
review and the example of spawning herring. Rev. Fish 
Biol. Fish. 16:183-200. 
