Effect of habitat patch characteristics on abundance and diversity of insects in an agricultural landscape
Effect of habitat patch characteristics on abundance and diversity of insects in an agricultural landscape
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DOI：
10.1007/s100219900015
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发表时间：
1998-03-01
期刊：
影响因子：
3.7
通讯作者：
Jonsen, I
中科院分区：
文献类型：
--
作者：
Fahrig, L;Jonsen, I
本研究的目的是测试斑块大小、斑块隔离、干扰频率和斑块寿命对生物密度和多样性的一般影响。我们在31个不同大小、隔离度、刈割干扰频率和年龄（种植苜蓿的年数）的紫花苜蓿草地取样，以草食性昆虫为主。对昆虫相对密度和多样性的影响在三个分类水平上进行了研究：所有昆虫、8个单独的目和6种豆科专科象鼻虫。研究发现：(a)隔离程度越高的紫花苜蓿田昆虫总丰富度越高，(b)干扰频率越高的紫花苜蓿田昆虫总丰富度越低，(c)中龄紫花苜蓿田昆虫总丰富度最高。在某些情况下，这些模式反映在较低的分类水平上，但在许多情况下，它们没有。这些结果很重要，因为它们表明，尽管我们不能同时为数千种物种中的每一种量身定制景观，但我们可能能够在更普遍的水平上产生预期的效果。
The objective of this study was to test for general effects of patch size, patch isolation, disturbance frequency, and patch life span, on density and diversity of organisms. We sampled predominantly herbivorous insects in 31 alfalfa fields that varied in size, isolation, frequency of disturbance by cutting, and age (number of years planted in alfalfa). Effects on insect relative density and diversity were examined at three taxonomic levels: all insects, eight separate orders, and six legume-specialist weevil species. We found that (a) more isolated alfalfa fields had higher overall insect richness, (b) fields with higher disturbance frequency had lower overall insect richness, and (c) fields of intermediate age had highest insect richness. In some cases these patterns were reflected at lower taxonomic levels, but in many cases they were not. These results are important because they indicate that, although we cannot simultaneously tailor a landscape for each of thousands of species, we may be able to produce desired effects at a more general level.