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首页> 外文期刊>Tropical Conservation Science >Evidence for an Edge Effect on Avian Nest Predation in Fragmented Afromontane Forests in the Bamenda-Banso Highlands, NW Cameroon
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Evidence for an Edge Effect on Avian Nest Predation in Fragmented Afromontane Forests in the Bamenda-Banso Highlands, NW Cameroon

机译：喀麦隆西北部Bamenda-Banso高地零散的Afromontane森林中鸟类巢捕食的边缘效应的证据

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Habitat loss and fragmentation in tropical areas have long been presumed to reduce avian nesting success due to increased predation rates. Nevertheless, this prediction remains largely untested in tropical areas, because empirical data on the impacts of forest fragmentation on nest predation at both the landscape and patch scales in the tropics are still scarce, especially in West Africa. In this study, we examined the edge effects on nest predation rates in a large montane forest block and small forest fragments. Artificial nests used for our experiments mimicked the real nests of passerines confined to montane forest undergrowth in the Bamenda-Banso Highlands, the Northwest region of Cameroon, an endemic bird area of high conservation priority. We found equal overall predation rates in the landscape dominated by the large forest block as well as in the landscape consisting of small forest fragments, implying that the probability of nest failure was not significantly affected by habitat fragmentation on a landscape scale. However, predation rates were higher close to forest edges in the small forest remnants. Since such remnants represent the majority of local montane forests, this result suggests that the edge effect on bird nest predation may reduce nest survival and the population viability of many range-restricted bird species confined to the remaining natural habitats of the Bamenda-Banso Highlands.
机译：长期以来，人们一直认为热带地区的生境丧失和破碎化会由于捕食率的提高而降低禽鸟筑巢的成功率。尽管如此，这一预测在热带地区仍未得到充分检验，因为关于热带破碎化对热带地区景观和斑块尺度上的巢穴捕食的影响的经验数据仍然很少，尤其是在西非。在这项研究中，我们研究了大型山地林区和小林区碎片对巢穴捕食率的边缘影响。用于我们的实验的人工巢模仿了在喀麦隆西北部的Bamenda-Banso高地（仅限于保护重点的地方性鸟类）的山地森林丛生的雀形目的真正巢。我们发现，在以大片森林为主的景观以及由小片森林组成的景观中，整体捕食率相等，这表明巢景破坏的可能性不受景观尺度上生境破碎化的显着影响。但是，在小片森林残留物中，靠近森林边缘的捕食率较高。由于这些残留物代表了大多数当地的山地森林，因此该结果表明，对燕窝捕食的边缘效应可能会降低燕窝的生存率，并限制许多只限于Bamenda-Banso高地其余自然栖息地的范围受限鸟类的生存能力。

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