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by Henk Van Den Brink
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The most common pattern among the migratory birds of Europe and North America involves flying north to breed in the temperate or.1 Bird species have diverse modes of migration. 2 Migratory birds follow established routes. 3 Patterns of migration.
The most common pattern among the migratory birds of Europe and North America involves flying north to breed in the temperate or arctic summer and returning to wintering grounds in warmer regions to the south. However, other patterns of migration have been observed: In tropical regions, for example, some species migrate in response to the cycle of wet and dry seasons. In mountainous areas, like the Himalayas, vertical movements may occur from higher breeding grounds to lower altitudes with less exposure to harsh winter weather.
Many species of bird migrate
Many species of bird migrate. Often, the migration route of a long-distance migratory bird doesn't follow a straight line between breeding and wintering grounds. Rather, it could follow a hooked or arched line, with detours around geographical barriers or towards suitable stopover habitat Short-distance passerine migrants have two evolutionary origins.
Examples of long distance bird migration routes. Many populations of migratory birds are in serious decline. Anthropogenic reasons for this include deforestation and habitat loss, hunting, pesticide uses, urbanization and climate change
December 15, 2009 History.
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van den Brink, . Bijlsma, . amp; van der Have, . European swallows Hirundo rustica in Botswana during three non-breeding seasons: the effects of rainfall on moult. Ostrich: 71 (1): 198–204. The rate of moult of European Swallows spending the non-breeding season in Botswana was studied during December-January of 1992/93,1993/94 and 1994/95 to investigate the effects of variability in rainfall and roosting habitat availability. Outside of the breeding period, migratory swallows primarily roost in large numbers in low vegetation such as tall grasses and reed beds (van den Brink, Bijlsma & van der Have, 2004;Bijlsma & van den Brink, 2005).
Are these migratory behaviors written into the genes, steering birds like automatons to their destinations? Or do young birds learn from adults where to migrate and how?
These migration routes have emerged over thousands of years of adaptation. Driven by competition for resources and nesting areas, some species are likely to have ventured farther and farther from their original habitats. Are these migratory behaviors written into the genes, steering birds like automatons to their destinations? Or do young birds learn from adults where to migrate and how?