constituted only of the biomass in the area. The most common fish in their diet was polar cod Boreogadus saida, which had a vintage dadpool deadpool fathers day shirt Manly’s prey preference index of . for ringed seals and . for harp seals. Pianka’s niche overlap index for the seal species in this area was , indicating an almost complete niche overlap. However, harp seals prey on significantly

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coots have not changed significantly over the last years Torti & Dunn . Local weather has been, and undoubtedly always will be, an important factor in determining when eggs are laid. Most north temperate birds start to lay eggs earlier in a warm spring than in a cold spring, independent of any global climate change Dunn ; Torti & Dunn ; Weatherhead . Storms and snowpack strongly influence reproductive schedule of birds breeding at high latitudes or altitudes. In , a year in which the snowpack was light and no late spring storms occurred on their breeding ground near m, mountain white-crowned sparrows began laying on June. In years of heavy snowpack andor late spring snowstorms, egg laying is delayed. In , a year in which the snowpack was the greatest in years, the first egg was laid on June. Over a -year period, the disappearance of snow cover varied by days, but clutch starts varied only by days. The date of first eggs varied less than the disappearance of snowpack because the birds laid eggs in nests in trees and willows in heavy snow years rather than on the ground . Late springearly summer snowstorms cause nest failures and decreases in insect and seed abundance Ehrlich ; Morton ; Morton but birds renested quickly after the snow melted . Changes in geographical distribution have occurred frequently for reasons other than climate change, such as emergence of new habitats or release of vintage dadpool deadpool fathers day shirt captive animals into new environments Aldrich & Weske . The degree of climate change occurring to date has already been implicated in significant range changes in some birds

Future changes in climates seem certain to alter distributions of many species. Changes in distribution are potentially problematic for many species. Individual species migrate, not entire communities, and therefore shifts in distributions and variation in the rate of migration among species are likely to lead to changes in interactions among species that might prove equally or even more disruptive for the survival of a species than variations in temperature or precipitation . Attempts by species to alter their distribution in response to current climate changes may prove more difficult now than in the past because man-made habitat fragmentation might impede migration andor gene flow Keller ; Davis & Shaw . In the future, as species extinctions and changes in various species’ distributions occur, disruptions among species associations, such as those between predators and prey, pollinators and their floral hosts, etc. are likely to occur. While considerable attention is currently directed at the degree of global warming and climate change in the past century, climate change is not a new, unique feature of the global climate. The combined results of instrument recordings and paleoclimatic proxy data climatic data derived from growth of tree rings, and stalagmites, cores through glaciers and coral reefs, sediment samples from oceans and lakes, etc. indicate that some degree of climate change has apparently been the rule rather than the exception throughout the evolution of life Jones . Periods of relative climatic stability have alternated with dramatic, and sometimes quite abrupt, change Alley ; Lang ; Severinghaus & Brooke ; Taylor ; Birks & Ammann . and . m in all regions. Mean thicknesses over m and thick, deformed ice were observed over some multiyear ice regimes shown to originate from the Arctic Ocean. Thick ice features more than m wide and thicker than m occurred frequently. Results indicate that even in today’s climate ice conditions must still be considered severe. These results have important implications for the prediction of ice break-up and summer ice conditions, and the assessment of sea ice hazards during the summer shipping season. Ringed seals Phoca hispida and harp seals P. groenlandica were collected for diet analysis along the ice edge in the Barents Sea to investigate possible niche overlap between these seal species. The diet analysis is based on contents from stomachs and intestines. A resource availability survey was conducted concurrently based on an echo survey combined with demersal and pelagic trawling. This survey showed that the potential prey biomass was dominated by pelagic crustaceans of total biomass – principally Themisto libellula and Thyssanoessa spp. Despite the prevalence of these crustaceans both seal species showed a strong preference for fish of various species, which

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