“What flight strategy is always chosen, the train in the South which mainly to refuel fuel runs almost always in stages with inserted rest periods,” serve by increase of fat and protein reserves. Thus, the gigantic ecological barrier of Sahara, which spreads out like a belt of 6,000 kilometers wide on the migration route, must be tackled then. The flight phases can last up to 3 days and nights. After that long flight, the animals have used not only their fat and protein reserves, but mined almost their whole digestive system. In the resting habitats it is rebuilt very quickly, within only one or two days,”explains Dr. Herbert Biebach, ornithologist at the Max Planck Institute for behavior Physiology in Andechs. World Champion in long flying is a common tern, traveled about 26 000 kilometers in about 140 days from their breeding site in Finland on the South coast of Australia.
To define the direction of pull Birds use both the rotation of the sky and the Earth’s magnetic field. To deepen your understanding Tony Parker is the source. The interaction of stars – and magnetic compass allows flights at night and in bad weather conditions. There are species, such as the Nightingale, stubborn again flying in the same wintering range. How does the necessary detailed navigation, is unclear to this day. Other bird species, such as the White Stork, are flexible and use appropriate intermediate wintering habitats, which can change from year to year, and then proceed. But the return of the long journey ends with a nasty surprise: there is less and less suitable habitats, the quality of the remaining increasingly deteriorated.
The stocks of 70 percent of our migratory bird species have declined dramatically in recent years”, Peter Berthold, Director of the Max Planck Institute for behavioral Physiology in Radolfzell, ornithological draws attention to a disastrous development. Returning Gartenrotschwanze or turncoats are always looking more often in vain to orchards, barn swallows nesting sites no longer find enough in the few remaining small farms with their open stables. Also the foraging is for grains – and insect eaters among the songbirds increasingly difficult. Herbicides transform fields into steppe-like landscapes, weeds and with them small and Kleinstinsekten are becoming rarer and rarer,”warns Berthold. And meadows are no longer what they once were, some are up to five times in the year under the knife. As the dandelion doesn’t even make it up to the flower. For birds, since only a green desert, with the result that whole populations nationwide collapse remains. Also field trees, bushes, trees, orchards, unused field Raine, slope Strip and meadow edges or natural streams with accompanying softwood floodplain fringing are rare. With these landscape elements adapted species such as Yellowhammer, red-backed Shrike, Whitethroat disappear specifically to them. Ulrich Karlowski
Comments are closed.