Agricultural conversion is one of the most prevalent anthropogenic uses on the terrestrial earth. Persistence of organisms in such landscapes is thought to be related to species-specific characteristics such as life history traits and dispersal distance. In an agricultural landscape in California, we examined local (farm-level) and landscape variables associated with nesting preferences of native ground-nesting bees. Compared to the known ground-nesting visitors to crops, bee community nesting on farms was depauperate. Further, more abundant and diverse communities of bees were found nesting at farms with patches of natural habitat near by than farms that were far away from natural habitat. Species responded differently to soil conditions created by farming practices, but the variability in nesting bee abundance was lower in farms near natural habitat than farms far from natural habitat. These findings suggest that most bee species are affected adversely but to varying degrees by agricultural intensification, and that natural habitats may buffer against the bee population variability in agricultural landscape. We present source/sink dynamics and resource limitations as possible explanations for the observed patterns.
You have requested a machine translation of selected content from our databases. This functionality is provided solely for your convenience and is in no way intended to replace human translation. Neither BioOne nor the owners and publishers of the content make, and they explicitly disclaim, any express or implied representations or warranties of any kind, including, without limitation, representations and warranties as to the functionality of the translation feature or the accuracy or completeness of the translations.
Translations are not retained in our system. Your use of this feature and the translations is subject to all use restrictions contained in the Terms and Conditions of Use of the BioOne website.
Vol. 79 • No. 4