Conservation Evidence: Evidence Data

Collected Evidence: Collected Evidence: Convert to organic farmingEvidence on the impact of organic farming on wild bees is equivocal. Three replicated trials in Europe or Canada have shown that the abundance of wild bees is higher under organic arable farming than under conventional farming. One of these showed that bee diversity is higher in organically farmed wheat fields and in mown fallow strips adjacent to them. Three replicated trials in Europe or the USA have found no significant difference in the numbers of bumblebees (two trials), bumblebee species (one trial), or wild bees visiting flowering crops (one trial) between conventional and organic arable farms. Collected Evidencehttps%3A%2F%2Fconservationevidencejournal.com%2Factions%2F25https%3A%2F%2Fconservationevidencejournal.com%2Factions%2F25Thu, 20 May 2010 07:02:08 +0100Collected Evidence: Collected Evidence: Leave field margins unsprayed within the crop (conservation headlands)Two replicated controlled trials in England showed that conservation headlands do not attract more foraging bumblebees than conventional crop fields. One replicated trial found fewer bees on conservation headlands than in naturally regenerated, uncropped field margins in England. Collected Evidencehttps%3A%2F%2Fconservationevidencejournal.com%2Factions%2F29https%3A%2F%2Fconservationevidencejournal.com%2Factions%2F29Thu, 20 May 2010 13:15:26 +0100Collected Evidence: Collected Evidence: Restrict certain pesticidesOne site comparison study in Italy showed that a reduction in the number of solitary bee species in late summer associated with repeated applications of the insecticide fenitrothion can be avoided by not applying the insecticide. Collected Evidencehttps%3A%2F%2Fconservationevidencejournal.com%2Factions%2F26https%3A%2F%2Fconservationevidencejournal.com%2Factions%2F26Thu, 20 May 2010 17:07:09 +0100Collected Evidence: Collected Evidence: Reduce fertilizer run-off into marginsWe have captured no evidence on the effects of specific interventions to reduce fertilizer run off into field margins. 'No evidence' for an action means we have not yet found any studies that directly and quantitatively tested this action during our systematic journal and report searches. Therefore we have been unable to assess whether or not the action is effective or has any harmful impacts. Please get in touch if you know of such a study for this action. Collected Evidencehttps%3A%2F%2Fconservationevidencejournal.com%2Factions%2F28https%3A%2F%2Fconservationevidencejournal.com%2Factions%2F28Thu, 20 May 2010 17:48:38 +0100Collected Evidence: Collected Evidence: Reduce pesticide or herbicide use generallyOne replicated trial in the USA showed that numbers of foraging bees on squash farms are not affected by the responsible use of pesticides. Collected Evidencehttps%3A%2F%2Fconservationevidencejournal.com%2Factions%2F27https%3A%2F%2Fconservationevidencejournal.com%2Factions%2F27Thu, 20 May 2010 19:22:20 +0100