Linking agricultural practice to insect and bird populations: a historical study over three decades
Linking agricultural practice to insect and bird populations: a historical study over three decades
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DOI：
10.1046/j.1365-2664.2002.00745.x
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发表时间：
2002-08-01
影响因子：
5.7
通讯作者：
Crick, HQP
中科院分区：
文献类型：
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作者：
Benton, TG;Bryant, DM;Crick, HQP
1. 关于农业实践对农田野生动物的影响的争论一直在继续。特别是，有一种假设认为，与农业集约化有关的昆虫数量的普遍下降可能导致了农田鸟类的减少。虽然一些生态学研究支持这一假设，但还需要更大规模和长期的研究。安装在12.2米高的塔式（洛桑式）上的吸力捕集器在英国各地对空中昆虫进行了近40年的采样。它们的捕获量在大的空间尺度上是相关的。我们分析了在苏格兰农村地区运行27年的单个吸力捕集器捕获的昆虫数据，结果表明，昆虫数量随着时间的推移发生了显著变化，尽管是非线性的。多变量数据集（12个常见节肢动物类群的数量）采用主成分分析（PCA）进行汇总，提取出3个成分，解释62%的变异。我们还使用PCA来描述农业变化，使用已公布的农业数据来衡量苏格兰的八项农业措施。节肢动物丰度和主成分（PC）得分与农业PC得分以及综合气候措施显著相关。利用英国鸟类学信托基金会的苏格兰常见鸟类普查数据，我们提取了三个PC来描述苏格兰15种常见农田鸟类的平均密度随时间的变化。鸟类密度测量值与昆虫丰度和PC分数显著相关，并且与农业和气候测量值独立相关。这些来自大量物种的数据为苏格兰农田鸟类、无脊椎动物数量和农业实践之间的时间变化提供了支持。虽然完全相关，但结果与农业变化通过食物质量或数量的变化影响鸟类的观点是一致的。这项工作还显示了大规模无脊椎动物取样（在这种情况下使用吸力陷阱）对监测农田生物多样性是如何有用的。
1. There is continuing debate about the impact of agricultural practices on farmland wildlife. In particular, it has been postulated that a general decline in insect abundance linked with intensification of agriculture may have contributed to farmland bird decline. While some autecological studies have supported this hypothesis, larger-scale and long-term studies are needed.2. Suction traps mounted on 12.2-m towers (Rothamsted-type) have been sampling aerial insects for nearly 40 years throughout the UK. Their catches are correlated over large spatial scales. We analysed insect catch data from a single suction trap run for 27 years in a rural location in Scotland, and showed that insect numbers have changed significantly over time, although non-linearly. The multivariate data set (numbers from the 12 common arthropod groups) was summarized using principal components analysis (PCA) to extract three components explaining 62% of the variation.3. We also used PCA to describe agricultural change, using published agricultural data for eight measures of farming in Scotland. Arthropod abundance and principal component (PC) scores were significantly related to the agricultural PC scores as well to summary climatic measures.4. Using Scottish data from the British Trust for Ornithology Common Birds Census, we extracted three PC to describe the time-dependent average densities of 15 common farmland birds in Scotland. Measures of bird density were significantly related to insect abundance and PC scores and, independently, to measures of agriculture and climate.5. These data from a broad suite of species provide support for linked temporal change between farmland birds, invertebrate numbers and agricultural practice in Scotland. Although entirely correlative, the results are consistent with the view that agricultural change has influenced birds through changes in food quality or quantity. The work also shows how large-scale invertebrate sampling, in this case using suction traps, is useful for monitoring farmland biodiversity.