Bumblebee nest density and the scale of available forage in arable landscapes
Bumblebee nest density and the scale of available forage in arable landscapes
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DOI：
10.1111/j.1752-4598.2009.00049.x
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发表时间：
2009-05-01
影响因子：
3.5
通讯作者：
Goulson, D.
中科院分区：
文献类型：
--
作者：
Knight, M. E.;Osborne, J. L.;Goulson, D.
将农业生产的需要与加强生物多样性结合起来需要一种生态规模的方法，因为大多数非养殖物种活动的地理规模不受农场边界的限制。熊蜂作为农作物和野生植物群的传粉者，是农田生物多样性的重要组成部分。然而，在这些景观中，决定其密度的因素仍然知之甚少。我们使用遥感景观数据和分子标记相结合，量化土地利用的影响（油菜、蚕豆和非作物区，所有这些都提供了合适的熊蜂饲料），在不同的空间尺度，以找到最好的预测群体密度熊蜂pascuorum Scopoli在耕地景观。估计群落密度与样地1000 m范围内所有生境类型的面积呈正相关。没有显着的关系，发现更大或更小的距离。这与早期对该物种觅食范围的估计一致。我们没有发现证据表明，巢大小增加饲料供应，虽然我们的数据不允许我们断然排除这种可能性。长期以来，人们一直怀疑饲料供应限制蜜蜂丰富的农业景观，但几乎没有直接的证据。在这里，我们报告了一个概念上固定的区域内的花卉丰富和熊蜂巢密度之间的直接关系。重要的是，我们建议，在此位置的这个物种在以前公布的估计觅食距离内的饲料供应是一个很好的预测的规模的影响，饲料供应筑巢密度。
Combining the needs of agricultural production with enhancing biodiversity requires a landscape-scale approach since the geographic scale at which most non-farmed species operate is unconstrained by farm boundaries. Bumblebees are a key component of farmland biodiversity as pollinators of both crops and wild flora. However, the factors determining their densities in such landscapes remain poorly understood.Using a combination of remote-sensed landscape data and molecular markers, we quantify the effects of land use (oilseed rape, field beans and non-cropped areas, all of which provide suitable bumblebee forage), at various spatial scales to find the best predictor of colony density for the bumblebee Bombus pascuorum Scopoli in an arable landscape.Estimated colony density was positively correlated with the area of all habitat categories within 1000 m of the sample site. No significant relationships were found for greater or lesser distances. This concurs with earlier estimates of the foraging range of this species. We found no evidence that nest sizes increased with forage availability, although our data do not allow us to categorically exclude this possibility.It has long been suspected that forage availability limits bee abundance in agricultural landscapes but there is little direct evidence for this. Here we report a direct relationship between floral abundance and bumblebee nest density within a notionally fixed area. Importantly, we suggest that the forage availability within the previously published estimated foraging distance for this species at this location is a good predictor of the scale of impact of forage provision on nesting density.