Landscape Composition and Crop Border Vegetation Diversity Effect on Pollinators, Auxiliary Fauna, and Phytophagous Arthropods of Leguminous Cropland in Araba (Basque Country)

Abstract

Many strategies and directives are starting to address the importance of an appropriate landscape for agricultural biodiversity, such as pollinators and auxiliary fauna. Therefore, it is necessary to identify which landscape features are more important for agricultural biodiversity conservation and the ecosystem services they offer, like pollination and pest control. Thus, the main objective of this study was to assess the effect of landscape composition, configuration, connectivity, and crop border vegetation on arthropod diversity. The arthropod community was sampled in eight legume crops located across a gradient of landscape complexity. Additionally, the border vegetation of each plot was characterized, and the surrounding landscape was analyzed at a small and a large scale. For the statistical analysis, Generalized Linear Mix Models and redundancy analyses were applied. Pollinators were positively affected mainly by landscape connectivity. Pest control agents were less influenced by the landscape and only before harvest were they positively affected by riparian forests. Finally, phytophagous arthropod richness increased with border vegetation diversity and cropland in the surroundings. In conclusion, in the leguminous crops of Araba landscape connectivity together with cropland extension in the surroundings should be considered to promote ES-offering fauna diversity.