The influence of patch area and connectivity on avian communities in urban revegetation
The influence of patch area and connectivity on avian communities in urban revegetation
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DOI：
10.1016/j.biocon.2010.10.014
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发表时间：
2011-02-01
影响因子：
5.9
通讯作者：
Fuller, Richard A.
中科院分区：
文献类型：
--
作者：
Shanahan, Danielle F.;Miller, Craig;Fuller, Richard A.
通过植被恢复景观越来越多地被用于退化景观的保护管理。为了有效地规划恢复计划，需要了解植被恢复的景观背景如何影响生物多样性的增加。本文研究了澳大利亚布里斯班城市植被斑块面积和连通性对鸟类物种丰富度和丰度的相对影响。通过对20个植被恢复点进行鸟类调查，采用分层划分和模型选择的方法，对斑块面积（包括所有直接连通的剩余植被的植被面积）和景观连通性（被小于10 m、20 m、30 m、40 m和50 m的植被间隙连接的植被面积）的相对重要性进行了测试。我们在分层划分过程中控制了许多可能的混杂变量。层次划分和模型选择均表明，连通性对鸟类物种丰富度有重要影响。斑块面积与连通性是影响鸟类总体丰度的重要因素。我们还对一系列饲养行会内的鸟类丰度数据进行了分层划分，得出了特定物种组的结果。总体而言，我们的数据表明，更大的连通性增加了殖民者可以到达的栖息地面积（导致更大的物种丰富度），而增加的斑块面积通过扩大已有物种的栖息地来增加丰富度。为了实现长期的保护目标，可能需要采取一种综合的方法，在整个景观中加强连通性和整体栖息地面积。(C) 2010 Elsevier Ltd.版权所有。
Landscape restoration through revegetation is being increasingly used in the conservation management of degraded landscapes. To effectively plan restoration programs information is required on how the landscape context of revegetation influences biodiversity gains. Here, we investigate the relative influence of patch area and connectivity on bird species richness and abundance within urban revegetation patches in Brisbane, Australia. We carried out bird surveys at 20 revegetation sites, and used hierarchical partitioning and model selection to test the relative importance of patch area (the area of revegetation including all directly connected remnant vegetation) and landscape connectivity (the vegetated area connected by less than 10 m, 20 m, 30 m, 40 m and 50 m cleared gaps). We controlled for a number of possible confounding variables within the hierarchical partitioning procedure. Both the hierarchical partitioning and model selection procedures indicated that connectivity had an important influence on bird species richness. Patch area in combination with connectivity were important influencing factors on overall bird abundance. We also carried out the hierarchical partitioning procedure for bird abundance data within a range of feeding guilds, yielding results specific to species groups. Overall our data suggest that greater connectivity enhances the habitat area that colonists can arrive from (resulting in greater species richness), whereas increased patch area allows for increased abundance by expanding the habitat available to species already present in a patch. A combined approach where connectivity and overall habitat area is enhanced across the landscape is likely to be necessary to meet long-term conservation objectives. (C) 2010 Elsevier Ltd. All rights reserved.