Spatial structure of an individual-based plant-pollinator network
Spatial structure of an individual-based plant-pollinator network
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DOI：
10.1111/oik.01426
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发表时间：
2014-11-01
期刊：
影响因子：
3.4
通讯作者：
Kissling, W. Daniel
中科院分区：
文献类型：
--
作者：
Dupont, Yoko L.;Trojelsgaard, Kristian;Kissling, W. Daniel
空间对复杂生态网络结构（如模块化）的影响在很大程度上仍然未知。在这里，我们采样了一个基于个人的植物传粉网络，通过以下的运动和花的访问标记的大黄蜂个人在蓟植物的身份和空间位置的茎绘制在一个50 × 50米的研究地块的人口。植物传粉网络由寄生雄性熊蜂主导，并具有显著的模块化结构，其中四个已识别的模块在空间上明显分开。这表明，个别花卉游客选择了精细规模的资源分配，即使在当地的网站。然而，空间映射的网络模块和移动的熊蜂个人也表现出重叠的密集中心的植物斑块。模型选择的基础上赤池信息标准与性状作为预测变量显示，蓟茎与大量的花头和许多近邻是特别重要的连接模块内的个人。相比之下，高大的植物和斑块中心附近的植物是连接不同模块的关键。这表明基于个体的植物-传粉者网络受到植物种群空间结构和个体特异性植物性状的影响。此外，观察时间长的大黄蜂个体对于模块之间和模块内部的连接都很重要。后者表明，大黄蜂个体仍然会表现出局部限制运动内的子补丁的植物种群，即使他们被观察了很长一段时间。我们以个体为基础和以动物为中心的生态网络采样方法开辟了新的途径，将觅食行为和种内性状变异纳入跨空间植物-动物相互作用的分析。
The influence of space on the structure (e.g. modularity) of complex ecological networks remains largely unknown. Here, we sampled an individual-based plant-pollinator network by following the movements and flower visits of marked bumblebee individuals within a population of thistle plants for which the identities and spatial locations of stems were mapped in a 50 x 50 m study plot. The plant-pollinator network was dominated by parasitic male bumblebees and had a significantly modular structure, with four identified modules being clearly separated in space. This indicated that individual flower visitors opted for the fine-scale division of resources, even within a local site. However, spatial mapping of network modules and movements of bumblebee individuals also showed an overlap in the dense center of the plant patch. Model selection based on Akaike information criterion with traits as predictor variables revealed that thistle stems with high numbers of flower heads and many close neighbours were particularly important for connecting individuals within the modules. In contrast, tall plants and those near the patch center were crucial for connecting the different modules to each other. This demonstrated that individual-based plant-pollinator networks are influenced by both the spatial structure of plant populations and individual-specific plant traits. Additionally, bumblebee individuals with long observation times were important for both the connectivity between and within modules. The latter suggests that bumblebee individuals will still show locally restricted movements within sub-patches of plant populations even if they are observed over a prolonged time period. Our individual-based and animal-centered approach of sampling ecological networks opens up new avenues for incorporating foraging behaviour and intra-specific trait variation into analyses of plant-animal interactions across space.