Endemic pollinator response to organic vs. conventional farming and landscape context in the Cape Floristic Region biodiversity hotspot

The effects of organic management and landscape context on two highly endemic and important pollinator taxa (bees and monkey beetles) were studied in the Cape Floristic Region (CFR) biodiversity hotspot, where a quarter of the land is intensively managed mostly for grape production. This functional group was chosen as there is concern worldwide over pollinator decline, particularly in regions of high levels of endemism of both flora and fauna such as the CFR. Species richness and abundance of bees and monkey beetles were sampled and compared between organic and conventional vineyards, with natural vegetation as reference habitat. Species richness of monkey beetles, but not the species richness of bees, benefited from organic compared to conventional vineyard management. Our findings support the hypothesis that the effects of landscape context and management may be taxon dependent. Monkey beetles have been suggested as strong indicators of disturbance. These beetles are among the most important pollinator guilds in the CFR, as they help to sustain the endemic vegetation of this region. Protection of the remaining natural habitat in close proximity to farmland is an imperative conservation strategy in this region.

► Management and landscape effect were tested for bees and monkey beetles in the Cape Floristic Region. ► Taxon specific response to management and landscape variables were found. ► Organic farming promoted monkey beetle but not bee species richness. ► Conservation efforts should involve both natural vegetation protection and organic farming.