P. Catry et al., Habitat selection by terrestrial birds on Pemba Island (Tanzania), with particular reference to six endemic taxa, BIOL CONSER, 95(3), 2000, pp. 259-267
An important proportion of the world's biodiversity is found on oceanic isl
ands. Island endemics frequently have small populations and are known to be
sensitive to habitat and community changes, making them prone to extinctio
n. In this paper, we assess the habitat distribution of the terrestrial bir
ds of Pemba, an oceanic island that has been classified has an "Endemic Bir
d Area". Most of Pemba has been profoundly altered by human activities and
only small patches of natural vegetation remain. However, we found that the
six endemic birds (four species and two sub-species) have colonised severa
l of the man-made habitats, including clove plantations and farmland, and r
emain widespread. Species richness was not reduced in these heavily managed
areas when compared to the remnants of tropical forest. Nonetheless, the m
ain strongholds of some endemic species are in habitats which have substant
ially declined in recent years, and which are likely to be further reduced
in area in the medium and long term. For these endemics, particularly the P
emba scops owl (Otus pembaensis), the conversion of areas that were formerl
y clove plantations to open farmland should be considered a serious threat.
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