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Parasitoids of the Bedeguar gall (Diplolepis rosae): effect of host scale on density and prevalence

Domenii publicaţii > Biologie + Tipuri publicaţii > Articol în revistã ştiinţificã

Autori: Zoltán László, Béla Tóthmérész

Editorial: ACTA ZOOLOGICA ACADEMIAE SCIENTIARUM HUNGARICAE, 57(3), p.219-232, 2011.

Rezumat:

Host plants have significant effects on parasitoid and herbivore distribution. There are just a few
reports on tritrophic interactions. We aimed to study the relationships between rose host shrub
and Bedeguar gall density with special attention to densities and prevalence of parasitoids at
two scales: host shrub and gall. We found that gall density was inversely density dependent of
shrub density. Parasitoid density was density dependent of both rose shrub and gall scales,
while prevalence of parasitoids was density dependent at the shrub scale, but density independent
at the gall scale. This pattern is likely to occur when parasitoids prefer those shrubs
which are infected with galls and avoid uninfected shrubs and support optimal foraging theory.

Cuvinte cheie: tritrophic interactions, gall wasp, Rosa spp., parasitism, optimal foraging theory