Justine Sears
University of Alaska Fairbanks
EcologyStable isotope ratioIsotope fractionationCerorhinca monocerataBiology
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Publications 3
#1Justine Sears (UAF: University of Alaska Fairbanks)H-Index: 3
#2Scott A. HatchH-Index: 29
Last. Diane M. O'Brien (UAF: University of Alaska Fairbanks)H-Index: 28
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A growing number of studies suggest that an individual’s physiology affects its carbon and nitrogen stable isotope signatures, obscuring a signal often assumed to be only a reflection of diet and foraging location. We examined effects of growth and moderate food restriction on red blood cell (RBC) and feather δ15N and δ13C in rhinoceros auklet chicks (Cerorhinca monocerata), a piscivorous seabird. Chicks were reared in captivity and fed either control (75 g/day; n = 7) or ~40% restricted (40 g/d...
78 CitationsSource
#1Justine Sears (UAF: University of Alaska Fairbanks)H-Index: 3
#2Scott A. Hatch (USGS: United States Geological Survey)H-Index: 29
Abstract Seabirds may be particularly vulnerable to neonatal food restriction because their nestling periods tend to be long and parents may not increase foraging effort during times of prey shortage. We performed a captive study of Rhinoceros Auklet (Cerorhinca monocerata) nestlings to identify adaptations for coping with food shortages, as well as possible consequences of early diet restriction on subadult morphology. We tested effects of a ~50% caloric restriction on Rhinoceros Auklet morphol...
26 CitationsSource
#1Cory T. Williams (UAF: University of Alaska Fairbanks)H-Index: 17
#2C. Loren Buck (UAA: University of Alaska Anchorage)H-Index: 22
Last. Alexander S. Kitaysky (UAF: University of Alaska Fairbanks)H-Index: 33
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When using stable isotopes as dietary tracers it is essential to consider effects of nutritional state on isotopic fractionation. While starvation is known to induce enrichment of 15N in body tissues, effects of moderate food restriction on isotope signatures have rarely been tested. We conducted two experiments to investigate effects of a 50–55% reduction in food intake on δ15N and δ13C values in blood cells and whole blood of tufted puffin chicks, a species that exhibits a variety of adaptive ...
94 CitationsSource