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Spurn | A Wisdom Archive on Spurn |  | Spurn A selection of articles related to Spurn |  |
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| ARTICLES RELATED TO Spurn | |
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 |  |  | Spurn: Encyclopedia II - Bird migration - Long-distance land bird migrationMany species of land birds migrate very long distances, the most common pattern being for birds to breed in the temperate or arctic northern hemisphere and winter in warmer regions, often in the tropics or the temperate zones of the southern hemisphere.
There is a strong genetic component to migration in terms of timing and route, but this may be modified by environmental influences. An interesting example where a change of migration route has occurred because of such a geographical barrier is the trend for some Blackcaps in central E ...
See also:Bird migration, Bird migration - Long-distance land bird migration, Bird migration - Broad-winged long distance migrants, Bird migration - Short-distance land bird migration, Bird migration - Wildfowl and waders, Bird migration - Seabirds, Bird migration - The tropics, Bird migration - Australasia, Bird migration - Study techniques Read more here: » Bird migration: Encyclopedia II - Bird migration - Long-distance land bird migration |
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 |  |  | Spurn: Encyclopedia II - Bird migration - AustralasiaBird migration is primarily, but not entirely, a Northern-Hemisphere phenomenon. In the Southern Hemisphere, seasonal migration tends to be much less marked. There are several reasons for this.
First, the largely uninterrupted expanses of land mass or ocean tend not to funnel migrations into narrow and obvious pathways, making them less obvious to the human observer. Second, at least for terrestrial birds, climatic regions tend to fade into one another over a long distance rather than be entirely separate: this means that rather than ...
See also:Bird migration, Bird migration - Long-distance land bird migration, Bird migration - Broad-winged long distance migrants, Bird migration - Short-distance land bird migration, Bird migration - Wildfowl and waders, Bird migration - Seabirds, Bird migration - The tropics, Bird migration - Australasia, Bird migration - Study techniques Read more here: » Bird migration: Encyclopedia II - Bird migration - Australasia |
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 |  |  | Spurn: Encyclopedia II - Bird migration - The tropicsIn the tropics there is little variation in the length of day throughout the year, and it is always warm enough for an adequate food supply. Apart from the seasonal movements of northern hemisphere wintering species, most species are in the broadest sense resident. However many species undergo movements of varying distances depending on the rainfall.
Many tropical regions have wet and dry seasons, the monsoons of India being perhaps the best known example. An example of a bird whose distribution is rain associa ...
See also:Bird migration, Bird migration - Long-distance land bird migration, Bird migration - Broad-winged long distance migrants, Bird migration - Short-distance land bird migration, Bird migration - Wildfowl and waders, Bird migration - Seabirds, Bird migration - The tropics, Bird migration - Australasia, Bird migration - Study techniques Read more here: » Bird migration: Encyclopedia II - Bird migration - The tropics |
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 |  |  | Spurn: Encyclopedia II - Bird migration - Broad-winged long distance migrantsSome large broad-winged birds rely on thermal columns of rising hot air to enable them to soar. These include many birds of prey such as vultures, eagles and buzzards, but also storks.
Migratory species in these groups have great difficulty crossing large bodies of water, since thermals can only form over land, and these birds cannot maintain active flight for long distances.
The Mediterranean and other seas therefore present a major obstacle to soaring birds, which are forced to cross at the narrowest points. This means that m ...
See also:Bird migration, Bird migration - Long-distance land bird migration, Bird migration - Broad-winged long distance migrants, Bird migration - Short-distance land bird migration, Bird migration - Wildfowl and waders, Bird migration - Seabirds, Bird migration - The tropics, Bird migration - Australasia, Bird migration - Study techniques Read more here: » Bird migration: Encyclopedia II - Bird migration - Broad-winged long distance migrants |
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 |  |  | Spurn: Encyclopedia II - Bird migration - Short-distance land bird migrationThe long-distance migrants in the previous section are effectively genetically programmed to respond to changing lengths of days. However many species move shorter distances, but may do so only in response to harsh weather conditions.
Thus mountain and moorland breeders, such as Wallcreeper and White-throated Dipper, may move only altitudinally to escape the cold higher ground. Other species such as Merlin and ...
See also:Bird migration, Bird migration - Long-distance land bird migration, Bird migration - Broad-winged long distance migrants, Bird migration - Short-distance land bird migration, Bird migration - Wildfowl and waders, Bird migration - Seabirds, Bird migration - The tropics, Bird migration - Australasia, Bird migration - Study techniques Read more here: » Bird migration: Encyclopedia II - Bird migration - Short-distance land bird migration |
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 |  |  | Spurn: Encyclopedia II - Bird migration - Wildfowl and wadersThe typical image of migration is of northern landbirds such as swallows and birds of prey making long flights to the tropics. Many northern-breeding ducks, geese and swans are also long-distance migrants, but need only to move from their arctic breeding grounds far enough south to escape frozen waters.
This means that most wildfowl remain in the Northern hemisphere, but in milder countries. For example, the Pink-footed Goose migrates from Iceland to Britain and neighbouring countries. Usually wintering grounds are traditional and lear ...
See also:Bird migration, Bird migration - Long-distance land bird migration, Bird migration - Broad-winged long distance migrants, Bird migration - Short-distance land bird migration, Bird migration - Wildfowl and waders, Bird migration - Seabirds, Bird migration - The tropics, Bird migration - Australasia, Bird migration - Study techniques Read more here: » Bird migration: Encyclopedia II - Bird migration - Wildfowl and waders |
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 |  |  | Spurn: Encyclopedia II - Bird migration - SeabirdsMuch of what has been said in the previous section applies to many seabirds. Some, such as the Black Guillemot and some gulls, are quite sedentary; others, such as most of the terns and auks breeding in the temperate northern hemisphere, move south varying distances in winter. The Arctic Tern has the longest-distance migration of any bird, and sees more daylight than any other, moving from its arctic breeding grounds to the antarctic wintering areas. One Arctic Tern, ringed (banded) as a chick on the Farne Islands off the British east coast, ...
See also:Bird migration, Bird migration - Long-distance land bird migration, Bird migration - Broad-winged long distance migrants, Bird migration - Short-distance land bird migration, Bird migration - Wildfowl and waders, Bird migration - Seabirds, Bird migration - The tropics, Bird migration - Australasia, Bird migration - Study techniques Read more here: » Bird migration: Encyclopedia II - Bird migration - Seabirds |
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