| Abstrakt: |
AbstractGall wasps in the cynipid genus DiplolepisGeoffroy (Hymenoptera: Cynipidae) attack various species of native and introduced roses in Canada. Although gall forms are diverse, gall wasps are parasitised by highly concordant complexes of parasitoids and inquilines. Many species of gall wasps attack the same host plants and develop over the same periods in the season, suggesting that opportunistic parasitoids may be exploiting a range of hosts rather than specialising. We sampled larvae of EurytomaIlliger (Hymenoptera: Cynipidae) from galls of D. variabilis(Bassett) and D. rosaefolii(Cockerell), gall inducers that develop fairly synchronously late in the growing season on leaves of Rosa woodsiiLindl. (Rosaceae) in the Okanagan Valley of central British Columbia, Canada. Galls were sampled at five different sites along a gradient from the north end of the valley to the Canada–United States border, a distance of 100 km. We extracted DNA, then amplified and sequenced the cytochrome b segment for each Eurytomalarva. We identified two well-supported clades that were differentiated by neither sampling location nor host. Instead, at least two species of Eurytoma, E. imminutaBugbee and E. longavenaBugbee, exist at these localities, and both exploit at least two of the Diplolepishosts found at these sites. |
