Evaluating the effects of floral resource specialisation and of nitrogen regulation on the vulnerability of social bees in agricultural landscapes
Evaluating the effects of floral resource specialisation and of nitrogen regulation on the vulnerability of social bees in agricultural landscapes
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DOI：
10.1007/s13592-016-0480-4
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发表时间：
2017-05-01
期刊：
影响因子：
2.4
通讯作者：
Bluethgen, Nico
中科院分区：
文献类型：
--
作者：
Kaemper, Wiebke;Weiner, Christiane;Bluethgen, Nico
在过去的几十年里，大黄蜂的数量和多样性一直在下降。虽然一些物种仍然丰富和广泛分布，但其他物种却经历了巨大的下降。我们测试，如果饮食的广度和排他性的花卉资源的使用影响丰富和土地利用的反应，熊蜂和蜜蜂在异质农业景观。基于生态位建模方法，我们发现，13个物种（12熊蜂属）中的3个。和A.意大利）对土地利用的反应是消极的，而没有任何物种对土地利用的反应是积极的。不同蜂种的总体丰度和土地利用响应与资源利用无关。多面手采集者B。lapidarius，稍微专业化一点的觅食者B。terrestris/lucorum物种复合体和专业觅食者B。wurflenii下降最多的土地利用。此外，我们发现，蜜蜂和两种熊蜂含有较高水平的氮比其他非捕食性Hyplitera和执行几乎完美的稳态，尽管变量的氮含量的花卉资源。我们的结论是，至少常见种类的社会蜜蜂具有良好的氮稳态能力。一般来说，我们的数据不支持这样的概念，即具有更专门的花卉资源使用的物种更有可能受到土地利用。
The abundance and the diversity of bumblebees have been declining for the past decades. While some species remain abundant and widespread, others have experienced vast declines. We tested if diet breadth and exclusiveness of floral resource use affected abundance and land-use response of bumblebees and honeybees in heterogeneous agricultural landscapes. Based on an ecological niche modelling approach, we discovered that three of 13 species (12 Bombus spp. and A. mellifera) responded negatively to land use, while no species responded positively. Overall abundance as well as land-use response of different bee species was unrelated to resource use. The generalist forager B. lapidarius, the slightly more specialised forager B. terrestris/lucorum species complex and the specialist forager B. wurflenii declined most with land use. Moreover, we found that honeybees and two bumblebee species contained higher levels of nitrogen than other non-predatory Hymenoptera and performed almost perfect homeostasis despite variable nitrogen contents of floral resources. We conclude that at least common species of social bees have good nitrogen homeostasis capacity. Generally, our data do not support the notion that species with more specialised floral resource use are more likely to suffer from land use.