Heterogeneity from increasing crop types: effect on carabid beetles
2015
Do, Y., Pusan National University, Busan, Republic of Korea | Joo, G.J., Pusan National University, Busan, Republic of Korea
We investigated the effect of crop type heterogeneity on carabid beetles in inten- sively managed agricultural landscapes. We compared different crops and habitat type configurations and compositions. In addition we assessed the effect of artifi- cial fragmentation by paved roads and water channels in an agricultural landscape. Crop type heterogeneity negatively affected carabid assemblages. Spatial dissec- tion by artificial structures had an even more negative effect on carabid diversity. The nested structure of the carabid assemblages among crop types was caused by a negative response to heterogeneity in the agricultural landscape. Even though crop types in an intensive agricultural landscape increased, the landscape may tend to fragment habitat. Although artificially fragmented habitats had more unstable carabid assemblages, heterogeneity from different crop types has also been shown to be a characteristic of fragmented landscapes. To produce a positive relationship between biodiversity and heterogeneity in an agricultural landscape, farming inten- sity should be reduced to allow for the conversion of highly productive lands into more natural habitats.
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