?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Adc&rft.title=Natural+enemies+and+their+food+sources+in+an+organic+crop+rotation+with+undersown+crops+and+animal+manure&rft.creator=Axelsen%2C+J%C3%83%C2%B8rgen+Aagaard&rft.creator=Toft%2C+S%C3%83%C2%B8ren&rft.creator=L%C3%83%C2%B4vei%2C+Gabor&rft.subject=+Cereals%2C+pulses+and+oilseeds&rft.subject=+Biodiversity+and+ecosystem+services&rft.description=The+abundance+and+species+composition+of+natural+enemies+(spiders+and+carabid+beetles)+and+some+of+their+important+arthropod+food+sources+(microarthropods%2C+dipterans+and+hymenopterans)+were+sampled+by+soil+extraction%2C+pitfall+traps+and+sticky+traps+in+winter+wheat+placed+in+an+organic+crop+with+undersown+catch+crops+and+animal+manure+(slurry).+The+working+hypothesis+was+that+the+undersown+crops+and+animal+manure+would+stimulate+the+microarthropods+and+other+food+sources%2C+thereby+enhancing+the+abundance+of+natural+enemies.++%0D%0AThe+ANOVA+analyses+revealed+no+impact+of+manuring+and+undersown+catch+crops+on+the+microarthropods%2C+but+there+was+a+larger+abundance+of+most+predator+groups+in+the+manured+plots.+There+was+not+found+any+impact+of+undersown+crops+on+the+arthropod+fauna+elements.+In+stead+analyses+with+the+statistical+package+PRIMER+revealed+correlations+between+certain+species+of+the+Collembola+community+and+the+natural+enemies+(carabids+and+spiders)%2C+correlations+which+due+to+knowledge+on+food+quality+relationships+are+likely+to+be+cause+%C3%A2%C2%80%C2%93+effect+relationships.+%0D%0AThe+results+suggest+that+when+attempting+to+boost+abundance+of+natural+enemies+in+agricultural+fields+the+working+hypotheses+needs+a+higher+level+of+detail.+It+seems+not+to+be+enough+to+boost+the+microarthropod+fauna+in+general%2C+but+it+is+important+to+distinguish+between+species+that+are+beneficial+or+unfortunate+for+the+natural+enemies.%0D%0A&rft.date=2007-10&rft.type=Journal+paper&rft.type=NonPeerReviewed&rft.format=application%2Fpdf&rft.identifier=http%3A%2F%2Forgprints.org%2F12309%2F1%2F12309.pdf&rft.identifier=Axelsen%2C+J%C3%83%C2%B8rgen+Aagaard%3B+Toft%2C+S%C3%83%C2%B8ren+and+L%C3%83%C2%B4vei%2C+Gabor+(2007)+Natural+enemies+and+their+food+sources+in+an+organic+crop+rotation+with+undersown+crops+and+animal+manure.+[+Submitted+%2C+October+2007]&rft.relation=http%3A%2F%2Forgprints.org%2F12309%2F