References
Abrams, P. A., & Matsuda, H. (2004). Consequences of behavioral
dynamics for the population dynamics of predator-prey systems with
switching. Population Ecology , 46 (1), 13–25. doi:
10.1007/s10144-003-0168-2
Anderson, D. R. (2008). Model based inference in the life
sciences . New York, NY: Spring Science+Business Media.
Araújo, M. S., Bolnick, D. I., & Layman, C. A. (2011). The ecological
causes of individual specialisation. Ecology Letters, 14 ,
948–958. doi: 10.1111/j.1461-0248.2011.01662.x
Arthur, B., Hindell, M., Bester, M. N., Oosthuizen, W. C., Wege, M., &
Lea, M. A. (2016). South for the winter? Within-dive foraging effort
reveals the trade-offs between divergent foraging strategies in a
free-ranging predator. Functional Ecology , 30 (10),
1623–1637. doi: 10.1111/1365-2435.12636
Bates, D., Mächler, M., Bolker, B., & Walker, S. (2015). Fitting linear
mixed-effects models using lme4. Journal of Statistical Software,
67 , 1-48. doi:
10.18637/jss.v067.i01
Beamish, R. J., Sweeting, R. M., Lange, K. L., Noakes, D. J., Preikshot,
D., & Neville, C. M. (2010). Early marine survival of coho salmon in
the Strait of Georgia declines to very low levels. Marine and
Coastal Fisheries, 2 , 424-439. doi:
10.1577/C09-040.1
Bjorkland, R., Pearson, S., Jeffries, S., Lance, M., Acevedo-Gutiérrez,
A., & Ward, E. (2015). Stable isotope mixing models elucidate sex and
size effects on the diet of a generalist marine predator. Marine
Ecology Progress Series, 526 , 213–225. doi: 10.3354/meps11230
Bolnick, D. I., Amarasekare, P., Araújo, M. S., Bürger, R., Levine, J.
M., Novak, M., … Vasseur, D. A. (2011). Why intraspecific trait
variation matters in community ecology. Trends in Ecology and
Evolution, 26 , 183–192. doi:
10.1016/j.tree.2011.01.009
Bolnick, D. I., Svanbäck, R., Fordyce, J. A., Yang, L. H., Davis, J. M.,
Hulsey, C. D., & Forister, M. L. (2003). The ecology of individuals:
incidence and implications of individual specialization. The American
Naturalist, 161, 1–28. doi:
10.1086/343878
Bolnick, D. I., Yang, L. H., Fordyce, J. A., Davis, J. M., & Svanbäck,
R. (2002). Measuring individual-level resource specialization.Ecology, 83 , 2936–2941. doi:
10.1890/0012-9658(2002)083[2936:MILRS]2.0.CO;2
Boness, D. J., Bowen, W. D., & Oftedal, O. T. (1994). Evidence of a
maternal foraging cycle resembling that of otariid seals in a small
phocid, the harbor seal. Behavioral Ecology and Sociobiology, 34 ,
95–104. doi: 10.1007/BF00164180
Bowen, W. D., & Iverson, S. J. (2012). Methods of estimating marine
mammal diets: a review of validation experiments and sources of bias and
uncertainty. Marine Mammal Science, 29 , 719–754. doi:
10.1111/j.1748-7692.2012.00604.x
Bowen, W. D., Tully, D., Boness, D. J., Bulheier, B. M., & Marshall, G.
J. (2002). Prey-dependent foraging tactics and prey profitability in a
marine mammal. Marine Ecology Progress Series, 244 , 235–245.
doi: 10.3354/meps244235
Bromaghin, J. F., Lance, M. M., Elliott, E. W., Jeffries, S. J.,
Acevedo-Gutiérrez, A., & Kennish J. M. (2013). New insights into the
diets of harbor seals (Phoca vitulina ) in the Salish Sea revealed
by analysis of fatty acid signatures. Fishery Bulletin, 111 ,
13–26. doi: 10.7755/FB.111.1.2
Burnham, K. P., & Anderson, D. R. (2010). Model selection and
multimodel inference (2nd ed.). New York, NY: Springer-Verlag.
Chasco, B. E., Kaplan, I. C., Thomas, A. C., Acevedo-Gutiérrez, A.,
Noren, D. P., Ford, M. J., … Ward, E. J. (2017). Competing
tradeoffs between increasing marine mammal predation and fisheries
harvest of Chinook salmon. Scientific Reports, 7 , 15439. doi:
10.1038/s41598-017-14984-8
D’Agnese, E. R. (2015). The effect of maternal traits on rearing success
in pacific harbor seals (Phoca vitulina richardsii ). (Unpublished
Masters thesis). Western Washington University.
Dall, S. R. X., Bell, A. M., Bolnick, D. I., & Ratnieks, F. L. W.
(2012). An evolutionary ecology of individual differences. Ecology
Letters, 15 , 1189–1198. doi:
10.1111/j.1461-0248.2012.01846.x
Deagle, B. E., Chiaradia, A., McInnes, J., & Jarman, S. N. (2010).
Pyrosequencing faecal DNA to determine diet of little penguins: is what
goes in what comes out? Conservation Genetics, 11 , 2039–2048.
doi: 10.1007/s10592-010-0096-6
Deagle, B. E., Thomas, A. C., Mcinnes, J. C., Clarke, L. J., Vesterinen,
E. J., Clare, E. L., … Eveson, J. P. (2019). Counting with DNA in
metabarcoding studies: how should we convert sequence reads to dietary
data? Molecular Ecology, 28 , 391-406. doi: 10.1111/mec.14734
Deagle, B. E., Tollit, D. J., Jarman, S. N., Hindell, M. A., Trites, A.
W., & Gales, N. J. (2005). Molecular scatology as a tool to study diet:
analysis of prey DNA in scats from captive Steller sea lions.Molecular Ecology, 14 , 1831–1842. doi:
10.1111/j.1365-294X.2005.02531.x
Hanski, I., Hansson, L., & Henttonen, H. (1991). Specialist Predators,
Generalist Predators, and the Microtine Rodent Cycle. Journal of
Animal Ecology , 60 , 353-367. doi: 10.2307/5465
Harmon, L. J., Matthews, B., Des Roches, S., Chase, J. M., Shurin, J.
B., & Schluter, D. (2009). Evolutionary diversification in stickleback
affects ecosystem functioning. Nature , 458 (7242),
1167–1170. doi: 10.1038/nature07974
Howard, S. M. S., Lance, M. M., Jeffries, S. J., & Acevedo-Gutiérrez,
A. (2013). Fish consumption by harbor seals (Phoca vitulina ) in
the San Juan Islands, Washington. Fishery Bulletin, 111 , 27–41.
doi: 10.7755/FB.111.1.3
Jeffries, S., Huber, H., Calambokidis, J., & Laake, J. (2003). Trends
and status of harbor seals in Washington State: 1978-1999. Journal
of Wildlife Management, 67 , 208-219. doi: 10.2307/3803076
Kendall, N. W., Marston, G. W., & Klungle, M. M. (2017). Declining
patterns of Pacific Northwest steelhead trout (Oncorhynchus
mykiss ) adult abundance and smolt survival in the ocean. Canadian
Journal of Fisheries and Aquatic Sciences, 74 , 1275-1290. doi:
10.1139/cjfas-2016-0486
Lalli, M. C, & Parsons, R. T. (1997). Biological oceanography: An
introduction . (2nd ed.). Burlington, VT: Butterworth-Heinemann.
Lance, M., Chang, W., Jeffries, S., Pearson, S., & Acevedo-Gutiérrez,
A. (2012). Harbor seal diet in northern Puget Sound: implications for
the recovery of depressed fish stocks. Marine Ecology Progress
Series, 464 , 257–271. doi: 10.3354/meps09880
Luxa, K., & Acevedo-Gutiérrez, A. (2013). Food habits of harbor seals
(Phoca vitulina ) in two estuaries in the central Salish Sea.Aquatic Mammals, 39 , 10–22. doi; 10.1578/AM.39.1.2013.10
Matejusová, I., Bland, F., Hall, A. J., Harris, R. N., Snow, M.,
Douglas, A., & Middlemas, S. J. (2013). Real-time PCR assays for the
identification of harbor and gray seal species and sex: a molecular tool
for ecology and management. Marine Mammal Science, 29 , 186–194.
doi:
10.1111/j.1748-7692.2011.00543.x
Neville, C. M., Beamish, R. J., & Chittenden, C. M. (2015). Poor
survival of acoustically-tagged juvenile Chinook salmon in the Strait of
Georgia, British Columbia, Canada. Transactions of the American
Fisheries Society, 144 , 25-33. doi:
10.1080/00028487.2014.954053
Novak, M., & Tinker, M. T. (2015). Timescales alter the inferred
strength and temporal consistency of intraspecific diet specialization.Oecologia , 178 (1), 61–74. doi: 10.1007/s00442-014-3213-2
Olesiuk, P. F. (2009). An assessment of population trends and
abundance of harbour seals (Phoca vitulina) in British
Columbia .(Pacific Biological Station Research Document 99/33). Nanaimo,
Canada: Department of Fisheries and Oceans.
Olesiuk, P. F., Bigg, M. A., Ellis, G. M., Crockford, S. J., & 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 . (Pacific Biological Station Report 1488-5379No. 1730).
Nanaimo, Canada: Department of Fisheries and Oceans.
Oksanen, J., Blanchet, F. G., Friendly, M., Kindt, R., Legendre, P.,
Mcglinn, D., … Wagner, H. (2018). Package “vegan.”Retrieved from https://github.com/vegandevs/vegan/issues
Peterson, S. H., Lance, M. M., Jeffries, S. J., & Acevedo-Gutiérrez, A.
(2012). Long distance movements and disjunct spatial use of harbor seals
(Phoca vitulina ) in the inland waters of the Pacific Northwest.
PLoS One, 7, e39046. doi: 10.1371/journal.pone.0039046
Pompanon, F., Deagle, B. E., Symondson. W. O. C., Brown, D. S., Jarman,
S. N., & Taberlet, P. (2012). Who is eating what: diet assessment using
next generation sequencing. Molecular Ecology, 21 , 1931–1950.
doi: 10.1111/j.1365-294X.2011.05403.x
Quinn, T. (2005). The behavior and ecology of Pacific salmon &
trout. Seattle: University of Washington Press.
Rothstein, A. P. (2015). Non-invasive genetic tracking of harbor
seals (Phoca vitulina) . (Unpublished Masters thesis). Western
Washington University.
Rothstein, A. P., McLaughlin, R., Acevedo-Gutiérrez, A., & Schwarz, D.
(2017). Wisepair: A computer program for individual matching in genetic
tracking studies. Molecular Ecology Resources, 17 , 267–277. doi:
10.1111/1755-0998.12590
Rudolf, V. H. W., & Rasmussen, N. L. (2013). Population structure
determines functional differences among species and ecosystem processes.Nature Communications , 4 . doi: 10.1038/ncomms3318
Schwarz, D., Spitzer, S., Austen, T., Kohnert, C., Keates, T., &
Acevedo-Gutiérrez, A. (2018). Large-scale molecular diet analysis in a
generalist marine mammal reveals male preference for prey of
conservation concern. Ecology & Evolution, 8 , 9889-9905. doi:
10.1002/ece3.4474
Sokal, R. R., & Rohlf, F. J. (2012). Biometry. (4th ended.). New York,
NY: W.H. Freeman and Company.
Teilmann, J., & Galatius, A. (2018). Harbor seal. In B. Würsig, J. G.
M. Thewissen, & K. K. Kovacs (Eds.) Encyclopedia of marine
mammals. (3rd ended.). (pp. 451-454). San Diego, CA: Academic Press.
Ternte, J. L., Bigg, M. A., & Wigg, O. (1991). Clines revisited: the
timing of pupping in the harbour seal (Phoca vitulina ). Journal
of Zoology, 224, 617–629. doi: 10.1111/j.1469-7998.1991.tb03790.x
Thomas, A. C., Jarman, S. N., Haman, K. H., Trites, A. W., & Deagle, B.
E. (2014). Improving accuracy of DNA diet estimates using food tissue
control materials and an evaluation of proxies for digestion bias.Molecular Ecology, 23 , 3706–3718. doi: 10.1111/mec.12523
Thomas, A. C., Deagle, B. E., Eveson, J. P., Harsch, C. H., & Trites,
A. W. (2016). Quantitative DNA metabarcoding: Improved estimates of
species proportional biomass using correction factors derived from
control material. Molecular Ecology Resources, 16 , 714–726. doi:
10.1111/1755-0998.12490
Thomas, A. C., Nelson, B. W., Lance, M. M., Deagle, B. E., & Trites, A
.W. (2017). Harbour seals target juvenile salmon of conservation
concern. Canadian Journal of Fisheries and Aquatic Sciences, 74 ,
907–921. doi:
10.1139/cjfas-2015-0558
Thompson, P. M., Mackay, A., Tollit, D. J., Enderby, S., & Hammond, P.
S. (1998). The influence of body size and sex on the characteristics of
harbour seal foraging trips. Canadian Journal of Zoology, 76 ,
1044–1053. doi: 10.1139/z98-035
Tollit, D. J., Greenstreet, S. P. R., & Thompson, P. M. (1997). Prey
selection by harbour seals, Phoca vitulina, in relation to variations in
prey abundance. Canadian Journal of Zoology , 75 ,
1508–1518.
Tollit, D. J., Schulze, A. D., Trites, A. W., Olesiuk, P. F., Crockford,
S. J., Gelatt, T. S., … Miller, K. M. (2009). Development and
application of DNA techniques for validating and improving pinniped diet
estimates. Ecological Applications, 19 , 889–905. doi:
10.1890/07-1701.1
Van Valen, L. (1965). Morphological variation and width of ecological
niche. The American Naturalist, 99 , 377–390. doi: 10.1086/282379
[dataset] Voelker, M., Schwarz, D., Thomas, A., Nelson, B., Kohnert,
C., Spitzer, S., Keates, T., Acevedo-Gutiérrez, A. (2018). Prey
proportions determined by metabarcoding and hard part analysis forPhoca Vitulina scat samples. Dryas . Persistent Identifier
(will be included once repositry is created)
Warton, D. I., & Hui, F. K. C. (2011). The arcsine is asinine: the
analysis of proportions in ecology. Ecology, 92 , 3–10. doi:
10.1890/10-0340.1
Werner, E. E., Mittelbach, G. G., & Hall, D. J. (1981). The role of
foraging profitability and experience in habitat use by the bluegill
sunfish. Ecology, 62 , 116–125. doi: 10.2307/1936675
West, B. T., Welch, K. B., & Gałecki, A. T. (2015). Linear mixed
models: a practical guide using statistical software. (2nd ed.). Boca
Raton, FL: Taylor and Francis Group.
Wilson, D. S., & Yoshimura, J. (1994). On the Coexistence of
Specialists and Generalists. The American Naturalist ,144 (4), 692-707. doi: 10.1086/285702
Wilson, K., Lance, M., Jeffries, S., & Acevedo-Gutiérrez, A. (2014).
Fine-scale variability in harbor seal foraging behavior. PLoS One,
9 , e92838. doi:
10.1371/journal.pone.0092838