Showing papers in "Journal of Insect Physiology in 2003"

TL;DR: Total energy consumption was lower in starved flies than desiccated ones, and Cactophilic Drosophila did not have greater initial amounts of reserves than mesic species, but may have lower metabolic rates that contribute to stress resistance.

TL;DR: The data suggest that the anterior midgut is structurally reinforced to resist osmotic pressures and that the transglycosylating alpha-Glu, together with CP and APN are bound to MPM, thus being both distributed over a large surface and prevented from excretion with honeydew.

TL;DR: By using normal and high-speed video recordings, the present study revealed that pulvilli are positioned on the surface in a particular way, as evidenced by splaying of the claws.

TL;DR: The results suggest that the cross-protection effect is at least partly due to Hsp70 expression induced by cold exposure, which is lower in the lines selected for resistance to cold than in the controls.

TL;DR: It is found that in contrast to previous work on Diptera, mating is not costly in terms of reduced longevity for female dung beetles, and there is no evidence for differential longevity costs associated with alternative reproductive tactics.

TL;DR: Current, still limited, understanding of the comparative biology and evolution of polydnaviruses (PDVs) is reviewed, especially in the context of the possible origins of these parasitoid viruses and of their coevolution with carrier wasps.

TL;DR: The results suggest that proline can be used as an energy substrate for flight muscle of Ae.

TL;DR: It is suggested that a better understanding of polydnaviruses would result by viewing these not as viruses, but rather as a wasp organelle system that evolved to shuttle wasp genes and proteins into hosts to evade and suppress their immune response.

TL;DR: It is found that the fungus garden contained glucose at a higher concentration than that found in leaves or fungal mycelium, and that this glucose was consumed by the ant to the extent that it was probably responsible for up to 50% of the nutritional needs of the workers.

TL;DR: It is suggested that while females are facultatively polyandrous, copula duration, sperm transfer and male accessory gland secretions act in succession to inhibit female receptivity.

TL;DR: Evidence showed that post-ingestive responses of the specialist S. exempta were less flexible than those observed in the generalist S. littoralis, a pattern which is again in accordance with comparisons of acridids differing in their host-plant range.

TL;DR: The incorporation of radioactively marked glucose into lipids showed however that lipogenesis did not occur at a sufficient level to increase lipid reserves and to compensate for lipid use, which has important implications for understanding nutrients allocation strategy in this species.

TL;DR: Data suggest that the full range of thermal responses of Antarctic Collembola is yet to be elucidated and it is postulated that behavioural avoidance of low temperatures by vertical migration may be key in I. klovstadi's short-term survival of nighttime temperatures.

TL;DR: It is concluded that the injected venom increased the hemolymph content of lipid and protein to support the growth and development of the ectoparasitoid larva.

TL;DR: The similarities in the time course of zinc, manganese and calcium deposition in the cuticular "tools" of the ant and those of the scorpion contribute to the evidence suggesting that heavy metal-halogen fortification evolved before these groups diverged.

TL;DR: Western flower thrips, Frankliniella occidentalis (Pergande) causes damage to plants when they are feeding and transmits Tomato spotted wilt virus (TSWV) during stylet penetration by electrical penetration graph (EPG, DC-system) recording.

TL;DR: The results indicate that the circadian system modulates olfactory sensitivity in the antennae and that the rhythm is driven by a circadian pacemaker in the optic lobes that is entrained by photoreceptors in the compound eyes.

TL;DR: Compensatory feeding among low-water and low-protein larvae was correlated with significantly higher fat content in larvae, pupae and adults, whereas low-sucrose animals were substantially leaner than those on the control diet.

TL;DR: The survival rate in all tissues was notably higher than that of whole animals, indicating that larval death could not be explained by the mortality in any of the tissues the authors tested, and seasonal increases in larval cold tolerance were closely matched by changes in the cold tolerance of individual tissues.

TL;DR: The present method for dividing the cost of reproduction into costs of mating and egg production can be applied to a broad taxonomic range of insect species, and thus it will be a useful model system for inter-specific comparisons of costs of sexual harassment by males and copulation itself.

TL;DR: It is shown that nodule formation and activation of the prophenoloxidase in locust haemolymph can both be enhanced by Lom-AKH-I, but it is argued that these processes involve distinct mechanisms in which eicosanoid synthesis is important for nodules formation, but not for the increased phenoloxIDase activity.

TL;DR: Experimental evidence is provided, based on superparasitism and injection experiments, that the figitid species Leptopilina boulardi uses an active mechanism to suppress the Drosophila melanogaster host immune response, i.e. the encapsulation of the parasitoid eggs.

TL;DR: The distribution, fine structure and function of the sensilla present on the antennal club of Rhynchophorus palmarum were studied, suggesting an interaction at the sensory neuron level between pheromone and plant odors, triggering synergic behavioral responses.

TL;DR: Results showed that fluid intake rate depended, as expected and previously reported in the literature, on sugar concentration and the associated fluid viscosity, and also depended on both the species-specific feeding technique and the extent of specialization on foraging on liquid food.

TL;DR: The pattern of occurrence suggests that presence of storage protein may play a role in caste differentiation in paper wasps, and no storage protein was found in any adult Vespula maculifrons, a yellowjacket wasp, suggesting that caste differentiate in vespine wasps does not incorporate storage protein as a component.

TL;DR: Injected M. cingulum mature eggs excised from the lateral oviducts of the female wasps were not encapsulated, while immature eggs or driselase treated mature ones provoked an encapsulation response within 2 h after injection, indicating that surface fibrous layer may play a role in protecting eggs from host's immune attack.

TL;DR: Thermographic measurements of body temperature showed that with increasing activity, the bees invested more energy to regulate the thorax temperature at increasingly higher levels (38.8-41.2 degrees C in highly active bees) and were more accurate.

TL;DR: It is suggested that the unpredictable environment of Marion Island means that P. marioni must always be physiologically prepared to survive cold snaps, and that this year-round cold hardiness therefore supersedes a rapid cold hardening response.

TL;DR: Venom from the endoparasitic wasp, Pimpla hypochondriaca, is composed of a mixture of high and low molecular weight proteins, possesses phenoloxidase activity, has immunosuppressive properties, and induces paralysis in several insect species.

TL;DR: The hypothesis that the pheromone released by functional queens inhibits reproduction in virgin alates by suppressing corpora allata activity and the production of JH is supported.