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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 manmade habitat fragmentation might impede migration andor gene flow Keller 1994; Davis & Shaw 2001. 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 2001.
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