Feeding ecology and behaviour of the last known surviving oriental Northern Bald Ibises, Geronticus eremita (Linnaeus, 1758), at their breeding quarters in Syria
2008
Abstract The last handful of individuals from the eastern population of the critically endangered Northern Bald Ibis (Geronticus eremita) have been closely observed and monitored during the breeding seasons 2002–2004 and 2006 in their breeding quarters in the Syrian desert. The home range used by the ibises was estimated to be up to about 450 km², which was already partly included in a specific protected area established by the Syrian authorities in 2004. Their main feeding habitat was a stony and sparsely vegetated open and gently undulating steppe. This feeding habitat is heavily overgrazed by the sheep flocks of the Bedouin nomads, and the native shrub coverage has almost completely disappeared due to uprooting for firewood. Another key feeding habitat are the man-made reservoirs, where ibises fed on larvae of Eastern Spadefoot Toads (Pelobates syriacus), perhaps the most profitable prey occurring at their breeding quarters. The bulk of the diet of Syrian breeding ibises is estimated to be a mixture of...
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