Wild bees play a crucial role in agriculture by providing pollination services in agricultural crops. However, configuration and composition of agricultural landscapes can affect wild bees in complex and sometimes conflicting ways, depending on species specific needs for foraging and nesting. This study explores how the composition and configuration of agricultural landscapes in two non-pollinator-dependent crops influence wild bee diversity and abundance in adjacent riparian areas. Twenty sites were selected, ten in olive grove landscapes and ten in irrigated cereal landscapes. Wild bees were sampled using pan traps placed along riparian field margins. Land use-land cover data were collected within a 400-meter buffer around each site. Using multivariate generalized linear models, the study assessed the influence of various landscape elements on wild bee communities. The results revealed that agricultural land use significantly affected bees in riparian margins, with olive grove landscapes supporting higher wild bee diversity and abundance than cereal landscapes. However, bee communities across both landscapes were dominated by similar genera, particularly Lasioglossum and Panurgus. More importantly, the impact of landscape features differed between the two crop types. In olive grove landscapes, landscape heterogeneity was the strongest predictor of bee abundance, while in cereal landscapes, tree cover was the most influential land use. The study also found that different bee species responded distinctively to landscape predictors. Landscape heterogeneity had a greater effect on below-ground nesting bees, whereas the proportion of crop cover had a stronger negative influence on above-ground nesting bees. These findings emphasize that the effects of agricultural landscapes on wild bee communities are shaped by both crop-specific characteristics and bee species’ ecological traits.
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