Multi-scale effects of landscape complexity and crop management on pollen beetle parasitism rate |
| |
Authors: | Adrien Rusch Muriel Valantin-Morison Jean-Pierre Sarthou Jean Roger-Estrade |
| |
Institution: | (1) INRA (French National Institute for Agricultural Research), UMR211 Agronomie, INRA/AgroParisTech, 78850 Thiverval-Grignon, France;(2) University of Toulouse, INPT-ENSAT, UMR 1201 DYNAFOR, 31326 Castanet Tolosan, France;(3) AgroParisTech, UMR 211 Agronomie, INRA/AgroParisTech, 78850 Thiverval-Grignon, France |
| |
Abstract: | Improving our understanding about how natural enemies respond to semi-natural habitats and crop management scattered in the
landscape may contribute to the development of ecologically based pest management strategies maximising biological control
services. We investigated how soil tillage and semi-natural habitats influenced the parasitism rates of pollen beetle (Meligethes aeneus F.) larvae at 8 different spatial scales (from 250 to 2000 m radius circular sectors) in 42 oilseed rape (OSR) fields. We
used multimodel inference approaches to identify and rank the influence of soil tillage and semi-natural habitats on parasitism
rates, and to quantify the importance of each scale. Parasitism rates were due to three univoltine parasitoid species (Tersilochus heterocerus, Phradis morionellus and P. interstitialis) and varied from 0 to 98%. We found that both fine and large scales contributed to explain significantly parasitism rates,
indicating that biological control of pollen beetle is a multi-scale process. At the 250 m scale, parasitism rates of T. heterocerus were positively related to the proportion of semi-natural habitats and the proximity to previous year OSR fields. At large
scales (1500 to 2000 m), parasitism rates of T. heterocerus were positively related to semi-natural habitats and negatively related to the proportion of previous year OSR fields with
conventional soil tillage. Parasitism rates of Phradis spp. were only positively related to the proportion of semi-natural habitats at the 1250 and 1500 m scales. These multi-scale
effects are discussed in relation to the influence of semi-natural habitats and soil tillage on parasitoid populations and
their movement behaviours within the landscape. |
| |
Keywords: | |
本文献已被 SpringerLink 等数据库收录! |
|