effect of migration birds and humans
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their subsequent breeding success to be recorded, as Geese travel in family parties on autumn migration … The effect of human activities on migrant shorebirds: successful adaptive management … Landscape approaches to studying the effects of disturbance on waterbirds.
Avian migration is a natural process, whereby different birds fly over distances of hundreds and thousands of kilometres in order to find the best ecological conditions and habitats for feeding, breeding and raising their young. When the conditions at breeding sites become unfavourable due to low temperatures, migratory birds fly to regions where conditions are better.
There are many different migration patterns. The majority of birds migrate from northern breeding areas in the summer, to southern wintering grounds. However, some birds breed in southern parts of Africa and migrate to northern wintering grounds, or horizontally, to enjoy the milder coastal climates in winter. Other birds migrate in terms of altitude, moving higher up a mountain in summer, and residing on lowlands during the winter months.
Migratory birds have the perfect morphology and physiology that enables them to fly fast and across long distances. However, their journey is often an exhausting one during which they go to their limits. The Red Knot for example, a 24 cm long wader weighing of around 220 g, breeds in Siberia and overwinters on the west coast of Africa, some even going down to South Africa. During its migration it loses nearly half of its body weight. Migratory birds therefore rarely fly to their destination non-stop but interrupt their journey frequently to rest and feed, or to sit out a spell of bad weather. Exactly how migrating birds find their flyways is not fully understood. Recent experiments indicate that they orientate along the Earth's magnetic field via special light receptors located in their eyes.
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Avian migration is a natural process, whereby different birds fly over distances of hundreds and thousands of kilometres in order to find the best ecological conditions and habitats for feeding, breeding and raising their young. When the conditions at breeding sites become unfavourable due to low temperatures, migratory birds fly to regions where conditions are better.
There are many different migration patterns. The majority of birds migrate from northern breeding areas in the summer, to southern wintering grounds. However, some birds breed in southern parts of Africa and migrate to northern wintering grounds, or horizontally, to enjoy the milder coastal climates in winter. Other birds migrate in terms of altitude, moving higher up a mountain in summer, and residing on lowlands during the winter months.
Migratory birds have the perfect morphology and physiology that enables them to fly fast and across long distances. However, their journey is often an exhausting one during which they go to their limits. The Red Knot for example, a 24 cm long wader weighing of around 220 g, breeds in Siberia and overwinters on the west coast of Africa, some even going down to South Africa. During its migration it loses nearly half of its body weight. Migratory birds therefore rarely fly to their destination non-stop but interrupt their journey frequently to rest and feed, or to sit out a spell of bad weather. Exactly how migrating birds find their flyways is not fully understood. Recent experiments indicate that they orientate along the Earth's magnetic field via special light receptors located in their eyes.
I HOPE IT WILL HELP YOU DEAR
THANKU
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