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Optimal clutch size of the gall wasp Diplolepis rosae (Hymenoptera: Cynipidae)

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

Autori: Zoltán László, Béla Tóthmérész

Editorial: ENTOMOLOGICA FENNICA, 19(3), p.168-175, 2008.


Clutch size of the gall wasp Diplolepis rosae was studied in galls on Rosa spp. in
Eastern Hungary and Romania, Transylvania on four dry pastures.We hypothesised
that there was an optimal clutch size, and it was controlled by the emerging
rate of the gall inducer and the escaping failure of hatched adults. The most frequent
clutch size was 25–30 chambers, and there was a second peak around 60
chambers in each frequency distribution. The most common clutch size did not
produce the highest proportion of larval emergence to adulthood. Parasitism rate
decreased with increasing clutch size,while the proportion of emerged gall wasps
increased and the proportion of dead individuals remained constant. The frequency
distribution of clutch sizes was independent of parasitism, emerging failure
or survival rate of the gall inducer. The escaping failure rate was also independent
from the clutch size.

Cuvinte cheie: Diplolepis rosae, gall size, emergence rate