Landscape context not patch size determines bumble-bee density on flower mixtures sown for agri-environment schemes
Landscape context not patch size determines bumble-bee density on flower mixtures sown for agri-environment schemes
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DOI：
10.1098/rsbl.2007.0425
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发表时间：
2007-12-22
期刊：
影响因子：
3.3
通讯作者：
Bourke, A. F. G.
中科院分区：
文献类型：
--
作者：
Heard, M. S.;Carvell, C.;Bourke, A. F. G.
欧洲大黄蜂数量的减少与农业集约化导致的栖息地和饲料供应的减少有关。由于大黄蜂为一系列野花和农作物授粉，这种下降可能会造成严重的生态和商业后果。在英国，人们正在尝试通过农业环境计划重新引入牧草资源，然而，关于牧草的面积或提供牧草的景观环境如何影响其成功的数据很少。在不同景观特征的地点，研究了播种饲草斑块对大黄蜂的影响。大黄蜂密度在播种斑块上高于对照生境，但不随斑块大小而变化，即总觅食者数量与斑块面积成正比。重要的是，在不同的景观梯度中，对播种牧草的相对响应差异很大，因此在耕地比例最高的地方，它们对吸引觅食大黄蜂的影响最大。
Bumble-bee declines across Europe have been linked to loss of habitat and forage availability due to agricultural intensification. These declines may have severe ecological and commercial consequences since bumble-bees pollinate a range of wildflowers and crops. In England, attempts are being made to reintroduce forage resources through agri-environment schemes, yet there are few data on how the area of forage, or the landscape context in which it is provided, affects their success. We investigated the effects of sown forage patches on bumble-bees across sites varying in landscape characteristics. Bumble-bee densities were higher on sown patches compared with control habitats but did not vary with patch size, i.e. total forager numbers were proportional to patch area. Importantly, the relative response to sown forage patches varied widely across a landscape gradient such that their impact in terms of attracting foraging bumble-bees was greatest where the proportion of arable land was highest.