| genetic and morphological differentiation in tephritis bardanae (diptera: tephritidae): evidence for host-race formation. | the fruit fly tephritis bardanae infests flower heads of two burdock hosts, arctium tomentosum and a. minus. observations suggest host-associated mating and behavioural differences at oviposition indicating host-race status. previously, flies from each host plant were found to differ slightly in allozyme allele frequencies, but these differences could as well be explained by geographical separation of host plants. in the present study, we explicitly test whether genetic and morphological varianc ... | 2004 | 15000651 |
| resource limitation of tephritid flies on lesser burdock, arctium minus (hill) bernh. (compositae). | the intensity of resource exploitation by phytophagous insects is usually considered to reflect population size. for populations of two flowerhead-attacking tephritid flies, however, the resources utilised were not related to the numbers of searching adults. tephritis bardanae schrank attacked 11-13% of the total flowerheads each year, and cerajocera tussilaginis (fab) 17-65%, despite much wider and uncorrelated variation in adult numbers. analysis of field data showed that the proportion of flo ... | 1991 | 28313330 |
| evidence for an oviposition-deterring pheromone in tephritis bardanae (schrank) (diptera: tephritidae). | female tephritis bardanae (schrank) exhibit a characteristic ovipositor-dragging behaviour immediately after laying eggs into a flowerbud of arctium minus (hill) bernh. to establish whether this behaviour is associated with an oviposition-deterring pheromone (odp), female t. bardanae were presented with clean, unattacked flowerbuds and fly activity was monitored using video recording equipment. the distribution of oviposition and fly behaviour were analysed. avoidance of attacked buds was reveal ... | 1989 | 28311911 |