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North America's Bird Nursery
出版Canadian Boreal Initiative, 2005
ISBN09733409249780973340921
URLhttp://books.google.com.hk/books?id=468sAQAAMAAJ&hl=&source=gbs_api
註釋These ecosystems support some demonstrates that the Boreal Forest Region is vital to the of the greatest abundance of wildlife on the continent, abundance of bird life in the U. S. and Canada, and also including massive caribou herds, intact predator-prey contributes in a significant way to the abundance of birds in systems with healthy populations of top predators like Mexico, the Caribbean, and [...] In fact, the Boreal Forest Region represents 26% of the land area of the The study's findings demonstrate that the Boreal Forest U. S. and Canada - yet this report shows that it supports Region is critical to the well-being of many species of nearly 50% of North America's bird species. [...] Thirty-five of Approximately 30% of all shorebirds (7 million) and 30% of 44 waterfowl species (80%) in the U. S. or Canada breed all landbirds (1-3 billion) that breed in the U. S. and Canada in the Boreal Forest Region. [...] For waterfowl in particular, a more accurate estimate of the proportion of continental 1) The first is Digital Distribution Maps of the Birds populations that occur in the Boreal Forest Region should of the Western Hemisphere (Ridgely et al. [...] Data from the 1990s decade were analyzed to provide an alternative measure of the proportion of breeding birds of each species in combinations of jurisdiction and BCR within the United States, and within Canada south of the arctic.