How landscape, pollen intake and pollen quality affect colony growth in Bombus terrestris
How landscape, pollen intake and pollen quality affect colony growth in Bombus terrestris
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DOI：
10.1007/s10980-016-0395-5
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发表时间：
2016-12-01
影响因子：
5.2
通讯作者：
Leonhardt, Sara Diana
中科院分区：
文献类型：
--
作者：
Kaemper, Wiebke;Werner, Patrizia K.;Leonhardt, Sara Diana
在过去的几十年里，大黄蜂的数量和多样性一直在下降。为了成功地保护大黄蜂种群，我们需要了解景观特征如何影响蜂群收集的花卉资源的数量和质量，以及随后的蜂群性能。因此，我们研究了黄尾大黄蜂采集花粉的数量和组成如何受到周围景观（即森林、城市、半自然栖息地的比例）的影响，以及它们与群体生长的关系。在周围景观不同的草地上放置30个陆生b群落。在开花植物可利用性最高的春季建立群落，监测其增重1个月。此外，我们还记录了储存花粉的数量，并比较了花粉的植物分类组成和营养品质（即氨基酸组成）。大黄蜂群落采集的花粉谱变化不大，但周围景观组成存在差异。他们平均收集了80%的木本植物花粉，其中34%属于槭属。早期菌落生长与木质花粉和蛋白质收集总量呈正相关，随半自然生境比例和总氨基酸浓度的增加而降低。本研究结果表明，木本植物在季节早期对多食陆生小蠊来说是非常重要的花粉来源。我们进一步表明，地熊蜂的群体生长主要受饲料数量而非质量的影响，这表明在大黄蜂的觅食季节，有几种丰富的植物种类开花，可能满足了群体的营养需求。
Abundance and diversity of bumblebees have been declining over the past decades. To successfully conserve bumblebee populations, we need to understand how landscape characteristics affect the quantity and quality of floral resources collected by colonies and subsequently colony performance.We therefore investigated how amount and composition of pollen collected by buff-tailed bumblebee Bombus terrestris colonies was affected by the surrounding landscape (i.e. the proportion of forest, urban, semi-natural habitats) and how they were related to colony growth.Thirty B. terrestris colonies were placed at grassland sites differing in surrounding landscape. Colonies were established in spring when availability of flowering plants was highest, and their weight gain was monitored for 1 month. We additionally recorded the quantity and compared plant taxonomic composition and nutritional quality (i.e. amino acid composition) of pollen stored.Bumblebee colonies varied little in the pollen spectra collected despite differences in surrounding landscape composition. They collected on average 80 % of pollen from woody plants, with 34 % belonging to the genus Acer. Early colony growth positively correlated with total amount of woody pollen and protein collected and decreased with increasing proportions of semi-natural habitats and total amino acid concentrations.Our results suggest that woody plant species represent highly important pollen sources for the generalist forager B. terrestris early in the season. We further show that colony growth of B. terrestris is predominantly affected by the quantity, not quality, of forage, indicating that several abundant plant species flowering throughout the bumblebees' foraging season may cover the colonies' nutritional needs.