The influence of scale on salmon habitat restoration priorities
The influence of scale on salmon habitat restoration priorities
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DOI：
10.1017/s1367943003003330
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发表时间：
2003-08-01
影响因子：
3.4
通讯作者：
Bilby, RE
中科院分区：
文献类型：
--
作者：
Feist, BE;Steel, EA;Bilby, RE
生境的丧失和改变是世界范围内物种数量减少的主要原因，因此生境的恢复和保护是一项重要的保护策略。尽管栖息地与受威胁或濒危物种之间存在明显的联系，但自然资源保护主义者一直难以明确地将丰度或种群健康与栖息地属性联系起来。鉴于栖息地与物种的关系通常以空间尺度来表征，而不考虑栖息地与种群之间的功能关系，因此栖息地-种群难题持续存在也就不足为奇了。为了探讨空间尺度对生境与种群表观关系的影响，本文以美国爱达荷州鲑鱼河流域为研究对象，研究了基于gis的生境数据与春夏大鳞鲑鱼（Oncorhynchus tshawytscha） redd（雌性产卵巢）密度之间的关系。Redd密度与气候、地质、湿地和地形密切相关。然而，与流域尺度模型相比，我们的河段尺度模型的预测能力较差。根据这些结果，我们得出结论。对栖息地属性的重要性的感知显然取决于我们的观察规模，并且当试图进行局部或达到规模的恢复项目时，恢复工作应该关注流域或景观规模的条件。
Habitat loss and alteration is the leading cause of species' declines world-wide, therefore habitat restoration and protection is a prominent conservation strategy. Despite obvious connections between habitat and threatened or endangered species, conservationists have been hard pressed explicitly to link abundance or Population health with habitat attributes. Given that habitat relationships with species are often characterized at a spatial scale that does not account for the functional relationships between habitat and populations, it is not surprising that the habitat-population conundrum persists. In order to explore the influence of spatial scale on the apparent relationship between habitat and populations, we examined the relationship between GIS-based habitat data and spring/summer chinook salmon (Oncorhynchus tshawytscha) redd (spawning nests built by females) densities in the Salmon River basin, Idaho, at two very different spatial scales: stream reach and watershed. Redd density was strongly correlated with climate, geology, wetlands and terrain. However, our stream-reach scale models provided poor predictive power compared with the watershed scale models. Based on these results, we conclude that out. perception of which habitat attributes were important was clearly a function of our scale of observation, and that restoration efforts should focus on conditions at the watershed or landscape scale when attempting to do local or reach scale restoration projects.