Landscape heterogeneity correlates with bee and pollen diversity while size and specialization degree explain species-specific responses of wild bees to the environment

作者：María Alejandra Parreño, Sean F. Werle, Louella Buydens, Clémentine Leroy, Stuart P. M. Roberts, Sumeer Koirala, Michał Filipiak, Michael Kuhlmann, Jean‐Luc Brunet, Mickaël Henry, C. Alaux, Fabrice Réquier, Niels Piot, Ivan Meeus, A-M Klein, Alexander Keller, Sara D. Leonhardt · 发表于：The Science of The Total Environment · 年份：2024 · DOI：10.1016/j.scitotenv.2024.176595 · 被引用次数：21 · 研究领域：Plant and animal studies、Insect and Arachnid Ecology and Behavior、Insect and Pesticide Research

Access to adequate pollen sources in agricultural landscapes is critical for the nutrition and development of bees. The type and quantity of pollen available to bees and may be determined by local plant diversity, land-use intensity and landscape structure but different bee species likely respond differently to these parameters. Identifying community and specific responses is therefore imperative to understand pollinator population dynamics in agricultural landscapes. We sampled bees in 36 plots along a land-use gradient at 4 sites in Belgium and Germany over two years. We collected 1821 bees from 100 bee species and constructed a pollen foraging network with 36 common wild bee species based on pollen metabarcoding. We investigated differences in community responses and species-specific responses to environmental variables. Landscape heterogeneity positively correlated with bee species richness, diversity and functional richness, and significantly explained bee community composition per plot. Bee collected pollen diversity correlated with bee species diversity. Furthermore, landscape heterogeneity positively correlated with bee collected pollen diversity when pooling abundant bee species, while it did not correlate with pollen diversity of the most abundant generalists. Land-use intensity and local plant diversity had no significant effect on bee diversity. Larger bees showed negative responses to increasing land-use intensity and bees with more specialized diets showed posit...