School of Biological Sciences, The University of Western Australia, Crawley, Western Australia, 6009, Australia.
CSIRO Health & Biosecurity, Centre for Environment and Life Sciences, Floreat, Western Australia, 6014, Australia.
Proc Biol Sci. 2024 Jun;291(2024):20232771. doi: 10.1098/rspb.2023.2771. Epub 2024 Jun 12.
Land use change alters floral resource availability, thereby contributing to declines in important pollinators. However, the severity of land use impact varies by species, influenced by factors such as dispersal ability and resource specialization, both of which can correlate with body size. Here. we test whether floral resource availability in the surrounding landscape (the 'matrix') influences bee species' abundance in isolated remnant woodlands, and whether this effect varies with body size. We sampled quantitative flower-visitation networks within woodland remnants and quantified floral energy resources (nectar and pollen calories) available to each bee species both within the woodland and the matrix. Bee abundance in woodland increased with floral energy resources in the surrounding matrix, with strongest effects on larger-bodied species. Our findings suggest important but size-dependent effects of declining matrix floral resources on the persistence of bees in remnant woodlands, highlighting the need to incorporate landscape-level floral resources in conservation planning for pollinators in threatened natural habitats.
土地利用变化改变了花卉资源的可获得性，从而导致重要传粉媒介的数量减少。然而，土地利用影响的严重程度因物种而异，受扩散能力和资源专业化等因素的影响，这两者都与体型大小相关。在这里，我们测试了周围景观（“基质”）中的花卉资源可获得性是否会影响孤立林地中蜜蜂物种的丰度，以及这种影响是否随体型大小而变化。我们在林地残余物内采样定量的花朵访问网络，并量化了林地内和基质中每个蜜蜂物种可用的花卉能量资源（花蜜和花粉卡路里）。林地中蜜蜂的丰度随周围基质中花卉能量资源的增加而增加，对体型较大的物种影响最大。我们的研究结果表明，基质花卉资源减少对受威胁自然栖息地中传粉媒介的残余林地中蜜蜂生存的影响具有重要但依赖体型的作用，这凸显了在保护规划中需要纳入景观水平的花卉资源。
