EMLEN, Douglas/J; University of Montana: Endocrine regulation of beetle horn expression: insights for horn evolution Males of many beetle species develop elaborate weapons called horns. In dung beetles (Onthophagus; Coleoptera: Scarabaeidae), expression of horns is regulated by a threshold: males growing larger than a critical body size produce a pair of full-length horns, and males […]

KNAPP, R.; Univ. Oklahoma: Endocrine mediation of vertebrate alternative male reproductive phenotypes: the next generation of studies In many species of animals, males may obtain reproductive success via one of several alternative reproductive tactics. In some of these species, behavioral variation is tightly correlated with morphological variation. Over the past decade or so, a concerted […]

GAUTHIER, G.*; GIROUX, J.-F.; BETY, J.; ROCHEFORT, L.; Universite Laval, Quebec, Qc, Canada; Universit� du Quebec a Montreal, Qc, Canada; Universite Laval, Quebec, Qc, Canada; Universite Laval, Quebec, Qc, Canada: Trophic Interactions in a High Arctic Snow Goose Colony Overabundance of goose populations caused by the food subsidy that they benefit in the south while […]

HIK, D.S.; Biological Sciences, University of Alberta, Edmonton: The future of biology in the Canadian Arctic: the view from the St. Elias Mountains, Yukon. For the past decade it has been apparent that ecosystems in northern Canada are changing in response to a variety of disturbances, including climate warming, bioaccumulation of pollutants, and increased industrial […]

BOONSTRA, R.; University of Toronto at Scarborough: Stress responses of mammals and birds to severe environments. Making babies and raising them successfully is difficult even in the best environments. When birds and mammals are confronted by this imperative in the arctic, the difficulties are magnified enormously. The summer days are long, but the growing season […]

KUTZ, S.J.; HOBERG, E.P.; Univ. Saskatchewan, Saskatoon; US National Parasite Collection, Beltsville: Stress in the Arctic- “Emerging” Parasitic Infections of Arctic Ungulates In northern ecosystems, patterns of association for hosts and parasites and the potential for emergence of diseases in wildlife are increasingly a focus of concern during a period of accelerated global change. Helminth […]

MUIR, Derek C.G.; Environment Canada, NWRI, Burlington ON: Spatial and Temporal Trends of Contaminants in Arctic Marine Environments Although Arctic marine biota were first demonstrated in the 1970s to have accumulated elevated levels of persistent organic pollutants (POPs) and mercury (Hg), there was limited knowledge until recently of the sources, pathways, levels, spatial and temporal […]

DANKS, H.V.; Canadian Museum of Nature, Ottawa, ON: Seasonal adaptations in arctic insects Many insect species with a wide range of adaptations to seasonality live in the arctic. Long, cold winters are met, for example, by cold hardiness including widespread tolerance to freezing and by the choice of protected overwintering sites. Adaptations to short, cool […]

DEROCHER, A.E.*; LUNN, N.J.; STIRLING, I.; University of Alberta, Edmonton; Canadian Wildlife Service, Edmonton; Canadian Wildlife Service, Edmonton: Polar bears in a changing climate Polar bears (Ursus maritimus) live throughout the Arctic circumpolar ice-covered waters, particularly in nearshore annual ice with high biological productivity. However, under scenarios predicted by climate change models, their habitat may […]

HEBERT, P. D. N.; University of Guelph: Life in Polar Waters Despite its status as a precipitation desert, Canada’s north is awash in freshwater. Like other arctic life, the organisms in these environments have been regarded as recent immigrants from glacial refugia in the south or west. Following a brief examination of the biogeographic patterning […]