Action: Increase the diversity of nectar and pollen plants in the landscape for bees
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One large replicated controlled trial showed that the average abundance of long-tongued bumblebees on field margins was positively correlated with the number of pollen and nectar agri-environment agreements in a 10 km grid square.
We have captured no direct evidence on the effects of managing elements of landscape such as areas of natural or semi-natural habitat, or crop diversity, to enhance nectar and pollen resources. One piece of evidence demonstrates that enhancing the quantity of planted nectar and pollen resources at the landscape (10 km²) scale benefits bees.
Supporting evidence from individual studies
In a replicated controlled trial in thirty-two 10 km grid squares across England (Pywell et al. 2006), the abundance of long-tongued bumblebees, mostly common carder bee B. pascuorum and garden bumblebee B. hortorum, recorded on trial field margins (various planting treatments) was positively correlated with the total number of pollen and nectar-mix agri-environment agreements in each 10 km square. There is no record of the numbers of long-tongued bumblebees in these grid squares before the agreements were implemented.