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Improved estimates of digestion correction factors and passage rates for harbor seal (Phoca vitulina) prey in the northeast Atlantic

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Improved estimates of digestion correction factors and passage rates for harbor seal (Phoca vitulina) prey in the northeast Atlantic. / Wilson, Lindsay J.; Grellier, Kate; Hammond, Philip S.

In: Marine Mammal Science, Vol. 33, No. 4, 10.2017, p. 1149-1169.

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Wilson, LJ, Grellier, K & Hammond, PS 2017, 'Improved estimates of digestion correction factors and passage rates for harbor seal (Phoca vitulina) prey in the northeast Atlantic' Marine Mammal Science, vol. 33, no. 4, pp. 1149-1169. https://doi.org/10.1111/mms.12436

APA

Wilson, L. J., Grellier, K., & Hammond, P. S. (2017). Improved estimates of digestion correction factors and passage rates for harbor seal (Phoca vitulina) prey in the northeast Atlantic. Marine Mammal Science, 33(4), 1149-1169. https://doi.org/10.1111/mms.12436

Vancouver

Wilson LJ, Grellier K, Hammond PS. Improved estimates of digestion correction factors and passage rates for harbor seal (Phoca vitulina) prey in the northeast Atlantic. Marine Mammal Science. 2017 Oct;33(4):1149-1169. https://doi.org/10.1111/mms.12436

Author

Wilson, Lindsay J. ; Grellier, Kate ; Hammond, Philip S. / Improved estimates of digestion correction factors and passage rates for harbor seal (Phoca vitulina) prey in the northeast Atlantic. In: Marine Mammal Science. 2017 ; Vol. 33, No. 4. pp. 1149-1169.

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@article{1a482069de9a49ed81793f81e22d5129,
title = "Improved estimates of digestion correction factors and passage rates for harbor seal (Phoca vitulina) prey in the northeast Atlantic",
abstract = "Diet composition in pinnipeds is widely estimated using hard prey remains recovered from feces. To estimate the size and number of prey represented in fecal samples accurately, digestion correction factors (DCFs) must be applied to measurements and counts of fish otoliths and cephalopod beaks. In this study, 101 whole prey feeding trials were conducted with six harbor seals (Phoca vitulina) and 18 prey species. We derived species- and grade-specific estimates of digestion coefficients (DCs) and species-specific recovery rates (RRs) to account for partial and complete digestion, respectively. Greater than 98{\%} of otoliths were passed within three days of consumption. RRs were smallest for Atlantic salmon smolts (RR = 0.306, SE = 0.031) and increasingly larger for sandeels (RR = 0.494, SE = 0.017), flatfish (RR = 0.789, SE = 0.033), and large gadoids (RR = 0.944, SE = 0.034). Species-specific otolith width DCs were smallest for Trisopterus species (DC = 1.14, SE = 0.015) and increasingly larger for flatfish (DC = 1.27, SE = 0.045), large gadoids (DC = 1.32, SE = 0.067) and sandeels (DC = 1.57, SE = 0.035). RRs were similar to those from gray seals (Halichoerus grypus), but harbor seal species- and grade-specific DCs were generally smaller. Differences in partial and complete digestion rates among prey species and between seal species highlight the importance of applying DCFs when reconstructing diet.",
keywords = "Digestion, Digestion correction factor, Digestion coefficient, Recovery rate, Passage rate, Harbor seal, Diet, Prey, Otolith, Beak",
author = "Wilson, {Lindsay J.} and Kate Grellier and Hammond, {Philip S.}",
year = "2017",
month = "10",
doi = "10.1111/mms.12436",
language = "English",
volume = "33",
pages = "1149--1169",
journal = "Marine Mammal Science",
issn = "0824-0469",
publisher = "John Wiley & Sons, Ltd (10.1111)",
number = "4",

}

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TY - JOUR

T1 - Improved estimates of digestion correction factors and passage rates for harbor seal (Phoca vitulina) prey in the northeast Atlantic

AU - Wilson, Lindsay J.

AU - Grellier, Kate

AU - Hammond, Philip S.

PY - 2017/10

Y1 - 2017/10

N2 - Diet composition in pinnipeds is widely estimated using hard prey remains recovered from feces. To estimate the size and number of prey represented in fecal samples accurately, digestion correction factors (DCFs) must be applied to measurements and counts of fish otoliths and cephalopod beaks. In this study, 101 whole prey feeding trials were conducted with six harbor seals (Phoca vitulina) and 18 prey species. We derived species- and grade-specific estimates of digestion coefficients (DCs) and species-specific recovery rates (RRs) to account for partial and complete digestion, respectively. Greater than 98% of otoliths were passed within three days of consumption. RRs were smallest for Atlantic salmon smolts (RR = 0.306, SE = 0.031) and increasingly larger for sandeels (RR = 0.494, SE = 0.017), flatfish (RR = 0.789, SE = 0.033), and large gadoids (RR = 0.944, SE = 0.034). Species-specific otolith width DCs were smallest for Trisopterus species (DC = 1.14, SE = 0.015) and increasingly larger for flatfish (DC = 1.27, SE = 0.045), large gadoids (DC = 1.32, SE = 0.067) and sandeels (DC = 1.57, SE = 0.035). RRs were similar to those from gray seals (Halichoerus grypus), but harbor seal species- and grade-specific DCs were generally smaller. Differences in partial and complete digestion rates among prey species and between seal species highlight the importance of applying DCFs when reconstructing diet.

AB - Diet composition in pinnipeds is widely estimated using hard prey remains recovered from feces. To estimate the size and number of prey represented in fecal samples accurately, digestion correction factors (DCFs) must be applied to measurements and counts of fish otoliths and cephalopod beaks. In this study, 101 whole prey feeding trials were conducted with six harbor seals (Phoca vitulina) and 18 prey species. We derived species- and grade-specific estimates of digestion coefficients (DCs) and species-specific recovery rates (RRs) to account for partial and complete digestion, respectively. Greater than 98% of otoliths were passed within three days of consumption. RRs were smallest for Atlantic salmon smolts (RR = 0.306, SE = 0.031) and increasingly larger for sandeels (RR = 0.494, SE = 0.017), flatfish (RR = 0.789, SE = 0.033), and large gadoids (RR = 0.944, SE = 0.034). Species-specific otolith width DCs were smallest for Trisopterus species (DC = 1.14, SE = 0.015) and increasingly larger for flatfish (DC = 1.27, SE = 0.045), large gadoids (DC = 1.32, SE = 0.067) and sandeels (DC = 1.57, SE = 0.035). RRs were similar to those from gray seals (Halichoerus grypus), but harbor seal species- and grade-specific DCs were generally smaller. Differences in partial and complete digestion rates among prey species and between seal species highlight the importance of applying DCFs when reconstructing diet.

KW - Digestion

KW - Digestion correction factor

KW - Digestion coefficient

KW - Recovery rate

KW - Passage rate

KW - Harbor seal

KW - Diet

KW - Prey

KW - Otolith

KW - Beak

UR - http://onlinelibrary.wiley.com/doi/10.1111/mms.12436/full#footer-support-info

U2 - 10.1111/mms.12436

DO - 10.1111/mms.12436

M3 - Article

VL - 33

SP - 1149

EP - 1169

JO - Marine Mammal Science

T2 - Marine Mammal Science

JF - Marine Mammal Science

SN - 0824-0469

IS - 4

ER -

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ID: 250475053