| resource allocation to testes in walnut flies and implications for reproductive strategy. | testes size often predicts the winner during episodes of sperm competition. however, little is known about the source of nutrients allocated to testes development, or testes plasticity under varying nutrient availability. among many holometabolous insects, metabolic resources can derive from the larval or adult diet. distinguishing the source of nutrients allocated to testes can shed light on life history factors (such as maternal influences) that shape the evolution of male reproductive strateg ... | 2010 | 20451528 |
| big maggots dig deeper: size-dependent larval dispersal in flies. | the ability of individual animals to select habitats optimal for development and survival can be constrained by the costs of moving through the environment. animals that seek overwintering sites underground, for example, may be constrained by the energy required to burrow into the soil. we conducted field and laboratory studies to determine the relationship between individual size and overwintering site selection in the tephritid flies, rhagoletis juglandis and rhagoletis suavis. we also explore ... | 2015 | 25894095 |
| resource quality or competition: why increase resource acceptance in the presence of conspecifics? | some animal species increase resource acceptance rates in the presence of conspecifics. such responses may be adaptive if the presence of conspecifics is a reliable indicator of resource quality. similarly, these responses could represent an adaptive reduction in choosiness under high levels of scramble competition. although high resource quality and high levels of scramble competition should both favor increased resource acceptance, the contexts in which the increase occurs should differ. in th ... | 2011 | 22479135 |
| superparasitism of larval hosts by the walnut fly, rhagoletis juglandis, and its implications for female and offspring performance. | the oviposition-preference-offspring-performance hypothesis predicts that female insects should prefer to deposit clutches on or in hosts that maximize offspring performance. an important assumption behind this prediction is that female fitness is tightly correlated with the fitness of any one offspring. in this study, we evaluate offspring performance in the walnut fly, rhagoletis juglandis cresson (diptera: tephritidae), in relation to a previously described oviposition preference for previous ... | 2004 | 15300487 |
| resource presence and operational sex ratio as determinants of copulation duration in the fly rhagoletis juglandis. | the effects of the interaction between the operational sex ratio (osr) and a resource (i.e. oviposition site) on mating dynamics have rarely been considered. we examined the effect of the resource presence and its interaction, with the effect of osr on copulation duration in rhagoletis juglandis, a tephritid fly species characterized by a resource-defence mating system in which males defend territories on walnut fruit. in this species, copulation duration varies from 30 s to over 1 h and was sho ... | 1999 | 10328792 |