Landscape effects on the complex of <Emphasis Type="Italic">Bactrocera oleae</Emphasis> parasitoids and implications for conservation biological control |
| |
Authors: | Luigi Boccaccio Ruggero Petacchi |
| |
Institution: | (1) Landscape Entomology Laboratory, BioLabs, Scuola Superiore Sant’Anna, Pisa, Italy |
| |
Abstract: | We studied the parasitoid complex of Bactrocera oleae Rossi (Diptera: Tephritidae) in order to analyse the parasitism response to landscape structure at different spatial extents.
Olive fruits were sampled and incubated in the laboratory for insect emergence, thus allowing the calculation of parasitoid
emergence rates. A landscape analysis was performed in five concentric buffers, ranging from 0.5 to 2 km diameter around the
sampling points. Woodland was chosen as focal class. The percentage of landscape and the splitting index, a measure of fragmentation,
were used to quantify landscape composition and configuration, respectively. Significant effects of landscape on parasitism
rates were detected. In particular, the percent parasitoid emergence was negatively affected by the splitting index of woodland
at a spatial extent ranging from 1 to 2 km. These findings suggest that landscape characteristics are likely to affect parasitoids
in well-structured agroecosystems as well. In particular, connectivity at a large scale may favour B. oleae parasitoids more than the abundance of woodland. Potential implications for conservation biological control are discussed. |
| |
Keywords: | |
本文献已被 SpringerLink 等数据库收录! |
|