Biebach H, Friedrich W, Heine G
Max-Planck-Institut für Verhaltensphysiologie, Vogelwarte, D-8138, Andechs, Germany.
Oecologia. 1986 Jun;69(3):370-379. doi: 10.1007/BF00377059.
The effect of body mass and fat reserves on the choice of the stopover place and on the stopover period was investigated in 3 species of passerine birds migrating through the Sahara in Egypt. Birds grounded in an oasis with food and water were more than 10% lighter than those from a desert stopover place which offered shade only. Stopover period was in general one day except for the light portion of oasis birds which stopped for up to three weeks during which they regained fat. A calculation of the maximum range which can be covered with the available fat depots revealed that nearly all birds from the desert stopover place should be able to cross the desert whereas about 60% of the oasis birds should not. An intermittant migratory strategy for the desert crossing is proposed with flight during the night and stopover during the day, even without drinking and feeding.
研究了三种穿越埃及撒哈拉沙漠的雀形目鸟类的体重和脂肪储备对中途停留地点选择和停留时间的影响。在有食物和水的绿洲停歇的鸟类比只提供阴凉的沙漠中途停留地的鸟类轻10%以上。除了绿洲鸟类中体重较轻的部分停留长达三周以恢复脂肪外，中途停留时间一般为一天。对可用脂肪储备所能覆盖的最大范围的计算表明，几乎所有来自沙漠中途停留地的鸟类都应该能够穿越沙漠，而约60%的绿洲鸟类则不能。提出了一种穿越沙漠的间歇性迁徙策略，即在夜间飞行，白天中途停留，即使不饮水和进食。
