J. Mark Hipfner
Environment Canada
22 Papers
103 Citations
J. Mark Hipfner is an academic researcher from Environment Canada. The author has contributed to research in topics: Predation & Ptychoramphus aleuticus. The author has an hindex of 11, co-authored 22 publications. Previous affiliations of J. Mark Hipfner include Simon Fraser University & Canadian Wildlife Service.
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Papers
Size- and condition-dependent predation: a seabird disproportionately targets substandard individual juvenile salmon
TL;DR: This is the first study to provide direct evidence for both size- and condition-selective predation on marine fish in the wild and is expected to be a starting point in evaluating how selective predation may structure or influence marine fish populations and bridges a fundamental incongruity between ecological theory and application.
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Two forage fishes as potential conduits for the vertical transfer of microfibres in Northeastern Pacific Ocean food webs.
J. Mark Hipfner,Moira Galbraith,Strahan Tucker,Katharine R. Studholme,Alice D. Domalik,Scott F. Pearson,Thomas P. Good,Peter S. Ross,Peter J. Hodum +8 more
TL;DR: No evidence is found that sand lance and herring currently act as major food-web conduits for microfibres along British Columbia's outer coast, nor that the local at-sea density of plastic necessarily determines how much plastic enters marine food webs via zooplanktivores.
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Corticosterone and stable isotopes in feathers predict egg size in Atlantic Puffins Fratercula arctica
TL;DR: Egg mass increased with both CORT and δ15N values in feathers, suggesting that the ability of female Puffins to meet the nutritional costs of egg production is related to CORT promoting increased foraging effort during moult and to consumption of a higher trophic-level diet.
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Effects of Extreme Climate Events on Adult Survival of Three Pacific Auks
Kyle W. Morrison,Kyle W. Morrison,J. Mark Hipfner,J. Mark Hipfner,Gwylim S. Blackburn,Gwylim S. Blackburn,David J. Green +6 more
TL;DR: The results, combined with those of previous studies, suggest that the major ongoing decline in the Cassin's Auklet population on Triangle Island is driven by negative effects of climatic variation on both reproductive success and the survival of adult females.
Inter‐oceanic variation in patterns of host‐associated divergence in a seabird ectoparasite
Muriel Dietrich,Florent Kempf,Florent Kempf,Elena Gómez-Díaz,Elena Gómez-Díaz,Alexander S. Kitaysky,J. Mark Hipfner,Thierry Boulinier,Karen D. McCoy +8 more
TL;DR: The relative force of host and geography in shaping population structure of a widely distributed and common ectoparasite of colonial seabirds, the tick Ixodes uriae, is tested.