Defining Corridor Functions for Endemic Birds in Fragmented South‐Temperate Rainforest
Defining Corridor Functions for Endemic Birds in Fragmented South‐Temperate Rainforest
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定义破碎的南温带雨林中特有鸟类的廊道功能
DOI：
10.1046/j.1523-1739.2000.98417.x
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发表时间：
2000
影响因子：
6.3
通讯作者：
T. D. De Santo
中科院分区：
文献类型：
--
作者：
K. Sieving;M. Willson;T. D. De Santo
摘要：对于栖息在智利中南部破碎温带雨林的五种特有林下鸟类（Rhinocryptidae、Furnariidae），我们区分了作为生存空间的植被廊道和仅适合短距离活动的植被廊道。在研究的第一阶段，我们使用被动和歌曲播放普查调查了 24 个宽度≤50 m 的森林走廊。走廊宽度决定物种的存在或不存在，而个体数量随着宽度和林下植被密度的增加而增加。在 ≤10 m 宽的走廊中很少遇到鸟类，但在 25-50 m 宽的走廊中总是出现鸟类。在被动普查期间，中等宽度（11-24 m）走廊中的鸟类被检测到的频率明显低于回放普查，这表明这些鸟类表现出明显领地展示的频率低于在较宽走廊中出现的鸟类，而在较宽走廊中，被动普查和回放普查产生了相似的检测率。因此，大约 10-25 m 宽的走廊可能是对于大多数常规用途来说太窄的走廊和对于鸟类建立领地足够宽的走廊之间的过渡。此外，随着走廊长宽比（ L / W）的增加，鸟类数量减少。 L / W ≥ 10 的廊道中几乎没有检测到鸟类，表明L / W 对廊道使用的影响存在阈值。在研究的第二阶段，在宽度≤10 m的走廊中进行的录音歌曲播放实验表明，所有五个物种都在其中进行了短距离旅行：52％的受访者从森林斑块移动到狭窄的走廊长达50 m。茂密的林下植被的可用性是鸟类对回放反应的主要预测因素，并且可能决定它们使用最小走廊进行短距离运动的意愿。我们建议，生活在智利南部农业景观中的特有雨林林下鸟类的走廊可以设计成实现不同的功能。
Abstract: For five species of endemic understory birds ( families Rhinocryptidae, Furnariidae) inhabiting fragmented temperate rainforest in southcentral Chile, we distinguished between vegetated corridors functioning as living space and those potentially suitable for short‐distance movements only. In the first phase of the study, we surveyed 24 forested corridors ≤50 m wide using passive and song‐playback censuses. Corridor width determined species presence or absence, whereas the number of individuals increased with width and understory vegetation density. Birds were infrequently encountered in corridors ≤10 m wide but were always present in corridors 25–50 m wide. Birds present in intermediate‐width (11–24 m) corridors were detected significantly less often during passive than playback census, suggesting that these birds exhibited conspicuous territorial display less frequently than those present in wider corridors, where passive and playback census yielded similar detection rates. Corridors approximately 10–25 m wide, therefore, may be transitional between corridors too narrow for most regular uses and those sufficiently wide for birds to establish territories. Also, bird abundance decreased as the ratio of corridor length to width ( L / W) increased. Almost no birds were detected in corridors with L / W ≥ 10, suggesting the existence of a threshold value for the influence of L / W on corridor use. In the second phase of the study, taped‐song playback experiments in corridors ≤10 m wide showed that all five species traveled in them for short distances: 52% of respondents moved up to 50 m from forest patches into narrow corridors. Availability of dense understory vegetation was the primary predictor of birds' responses to playback and may determine their willingness to use minimal corridors for short movements. We suggest that corridors for endemic rainforest‐understory birds living in agricultural landscapes of southern Chile can be designed to fulfill distinct functions.