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首页> 外文期刊>Suid-Afrikaanse Tydskrif vir Natuurwetenskap en Tegnologie >Habitat preference, feeding distance and flight direction of cattle egrets (Bubulcus ibis) in the central Free State.
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Habitat preference, feeding distance and flight direction of cattle egrets (Bubulcus ibis) in the central Free State.

机译：自由中央中部白鹭（Bubulcus ibis）的栖息地偏好，觅食距离和飞行方向。

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摘要

In the Free State, two thirds of all actively feeding cattle egrets (Bubulcus ibis) were observed in open grassland habitats. If the birds that fed in association with hosts are considered separately, the dominance of grassland, especially short grass, is even higher. By contrast, cattle egrets that fed independently of hosts showed a clear preference for tall grass and edges of water body. Marked differences in habitat use between cattle egrets that fed in the presence or absence of hosts even occurred on a temporal basis during the course of the day. More than three quarters (78,6%) of all cattle egrets observed in the vicinity of the Soetdoring Nature Reserve fed within a radius of 15 km of the breeding colony. Depending on the time of the year, significant changes occurred in the general flight direction from and to the colony. Positive correlations were obtained between the outward and return flights, but not between the general flight direction and prevailing wind direction.
机译：在自由州，在开阔的草地栖息地中观察到所有主动喂养的牛背鹭（Bubulcus ibis）的三分之二。如果单独考虑与寄主一起喂养的鸟类，草原，尤其是短草的优势更大。相比之下，独立于宿主饲养的牛背鹭对高草和水体边缘表现出明显的偏爱。在有或没有宿主的情况下进食的白鹭之间的栖息地利用存在显着差异，甚至在一天中的时间上也会发生。在Soetdoring自然保护区附近观察到的所有牛背鹭中，有超过四分之三（78.6％）在繁殖地15公里半径范围内觅食。根据一年中的不同时间，往返殖民地的总体飞行方向发生了重大变化。正向相关性在向外飞行和回程飞行之间获得，但在总飞行方向与盛行风向之间未获得。

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