Nutritional and physiological ecology of large mammals, with a focus on extrinsic and intrinsic factors affecting population performance.
My research has concentrated on examining nutrition as a mechanistic thread between environmental variation (e.g., winter severity, habitat composition) and population variation of large ungulates, as well as of wolves. In an effort to expand the biologist's and manager's understanding of habitat requirements and enhance conservation efforts, I have employed experimental and natural comparison designs, often in long-term studies, to examine the effects of seasonal weather conditions, habitat alteration, nutritional restriction and recovery on physiological indices, body condition, food habits, movements, habitat use, age-specific survival and reproduction. Specifically, my collaborative research has involved white-tailed deer and wolves in northern Minnesota; elk and bison in Yellowstone National Park, before and after the historic fires of 1988; moose on Isle Royale and in northern Minnesota; and elk and mule deer in Arizona.
DelGiudice, G. D., and W. J. Severud. 2016. Blood profiles and associated birth characteristics of free-ranging moose (Alces americanus) neonates in a declining population in northeastern Minnesota. Alces 52:85-99.
Severud, W. J., G. D. DelGiudice, and T. R. Obermoller. 2016. Minimizing mortality of moose neonates from capture-induced abandonment. Alces 52:73-83.
Severud, W. J., and G. D. DelGiudice. 2015. Potential vertical transmission of winter ticks (Dermacentor albipictus) from moose (Alces americanus) dams to neonates. Journal of Wildlife Diseases 52:186-188.
DelGiudice, G. D., W. J. Severud, T. R. Obermoller, R. G. Wright, T. A. Enright, and V. St-Louis. 2015. Monitoring movement behavior enhances recognition and understanding of capture-induced abandonment of moose neonates. Journal of Mammalogy 96:1005-1016.
Severud, W. J., G. D. DelGiudice, T. R. Obermoller, T. A. Enright, R. G. Wright, and J. D. Forester. 2015. Using GPS collars to determine parturition and cause-specific mortality of moose calves. Wildlife Society Bulletin 39:616-625.
DelGiudice, G. D., J. R. Fieberg, and B. A. Sampson. 2013. A long-term assessment of the variability in winter use of dense conifer cover by female white-tailed deer. PLoS ONE 8(6): e65368. Doi: 10.1371/journal.pone.0065368
DelGiudice, G. D., B. A. Sampson, and J. H. Giudice. 2013. A long-term assessment of the effect of winter severity on the food habits of white-tailed deer. Journal of Wildlife Management. 77:1664-1675.
DelGiudice, G. D., B. A. Sampson, M. S. Lenarz, M. W. Schrage, and A. J. Edwards. 2011. Winter body condition of moose (Alces alces) in a declining population in northeastern Minnesota. Journal of Wildlife Diseases 47: 30-40.
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