Heterogeneous landscapes promote population stability
Heterogeneous landscapes promote population stability
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DOI：
10.1111/j.1461-0248.2010.01441.x
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发表时间：
2010-04-01
期刊：
影响因子：
8.8
通讯作者：
Thomas, Chris D.
中科院分区：
文献类型：
--
作者：
Oliver, Tom;Roy, David B.;Thomas, Chris D.
生境异质性常被认为对种群的稳定性很重要，并被提倡作为一种有助于物种保护的手段，但这种假设的证据很差。在这里，我们表明，异质景观，包含各种合适的栖息地类型与更稳定的人口动态为35个英国蝴蝶物种从166个网站。此外，地形异质性也可能促进稳定性。我们的研究结果是强大的不同措施的人口变异，网站之间的平均丰度的差异，并在景观分析的空间尺度（半径1-5公里的中心的网站）。景观异质性的物种之间的反应不同，更多的移动的“更广泛的农村”的物种，在较大的景观尺度上的栖息地异质性对种群动态的影响最大。我们认为，异质景观提供了更大范围的资源和小气候，这可以缓冲人口对气候变化，并产生更稳定的人口动态。
P>Habitat heterogeneity is often suggested as being important for the stability of populations, and promoted as a means to aid the conservation of species, but the evidence for such an assumption is poor. Here we show that heterogeneous landscapes that contain a variety of suitable habitat types are associated with more stable population dynamics for 35 British butterfly species from 166 sites. In addition, topographic heterogeneity may also promote stability. Our results were robust to different measures of population variability, differences in mean abundance among sites, and to the spatial scale (radius 1-5 km around the centres of sites) at which landscapes were analysed. Responses to landscape heterogeneity differed among species; for more mobile 'wider-countryside' species, habitat heterogeneity at larger landscape scales had the strongest effect on population dynamics. We suggest that heterogeneous landscapes offer a greater range of resources and microclimates, which can buffer populations against climatic variation and generate more stable population dynamics.