Bumble bee pollen use and preference across spatial scales in human-altered landscapes
Bumble bee pollen use and preference across spatial scales in human-altered landscapes
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DOI：
10.1111/een.12056
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发表时间：
2013-12-01
影响因子：
2.2
通讯作者：
Kremen, Claire
中科院分区：
文献类型：
--
作者：
Jha, Shalene;Stefanovich, Lev;Kremen, Claire
虽然关于本地传粉者减少的讨论在全球范围内急剧增加，但关于本地传粉者如何利用自然和人为改变景观中的花卉资源的信息仍然相对有限。具体而言，很少有人知道花粉的收集，幼虫和成年蜜蜂食物的重要组成部分，以及花粉收集模式是否会改变栖息地，空间尺度，和/或本地和非本地花卉资源分布。在这项研究中，花粉收集模式和偏好的黄脸熊蜂，熊蜂vosnesenskii，在自然和人为改变的网站梯度进行了检查。三个假设进行了调查：（i）在景观尺度（2km），而不是本地规模（250 m）的植物和栖息地组成因素是最具预测性的蜜蜂收集花粉组成：（ii）收集本地花粉的网站，在景观尺度的自然栖息地的比例更大;蜜蜂对本地花粉的偏好高于非本地花粉，熊蜂在大尺度河岸森林覆盖率较低时采集的花粉种类较多，但在局部-群落尺度植物种类丰富度较高。此外，B.vosnesenskii收集花粉从广泛的植物科，并没有表现出显着的偏好本地与非本地物种。最后，偏好性分析表明，在研究期间，B.vosnesenskii表现出的唯一显着偏好是对本地灌木Heteromeles arbutifolia。总的来说，这项研究的结果揭示了物种丰富的花卉斑块（本地和非本地）的重要性，在自然和人为改变的景观传粉供应。
While the discussion of native pollinator decline has grown dramatically worldwide, information on how native pollinators utilise floral resources in natural and human-altered landscapes remains relatively limited. Specifically, little is known about the collection of pollen, an essential component of larval and adult bee food, and whether pollen collection patterns change across habitats, spatial scales, and/or native and non-native floral resource distributions. In this study, the pollen collection patterns and preferences of the yellow-faced bumble bee, Bombus vosnesenskii, were examined across a gradient of natural and human-altered sites. Three hypotheses were investigated: (i) landscape-scale (2km) but not local-scale (250m) floral and habitat composition factors are most predictive of bee-collected pollen composition; (ii) collection of native pollen is greater in sites with greater proportions of natural habitat at landscape scales; and (iii) bees exhibit greater preference' for native versus non-native pollen.Bombus vosnesenskii collected more species of pollen when landscape-scale riparian forest cover was low but local- and landscape-scale floral species richness was high. Also, B.vosnesenskii collected pollen from a wide range of plant families and did not exhibit a significant preference for native versus non-native species. Finally, preference analysis indicated that the only significant preference exhibited by B.vosnesenskii during the study period was for Heteromeles arbutifolia, a native shrub. Overall, results from this study reveal the importance of species-rich floral patches (native and non-native) for pollinator provisioning across natural and human-altered landscapes.