Showing papers in "Journal of Insect Physiology in 1987"

TL;DR: F Females continuously exposed to males lived less long than intermittently exposed females, and this longevety difference could not be explained in terms of differences in either rate of egg-production or egg-hatchability.

TL;DR: In their contribution Baust and Rojas considered the factors which may influence the classification of a species as freezing tolerant or intolerant (supercooling point, optimal cooling/ warming rates, state of adaptation and methods of determining survival) and summarized the observations which challenge the consensus view which identifies the gut as the probable prime site for ice nucleation in freezing-intolerant species.

TL;DR: The abnormalities induced in H. virescens plasmatocytes by C. sonorensis virus contribute to the suppression of encapsulation, and the onset of haemocytic abnormalities occurred more rapidly after natural parasitism of 3rd-instar host larvae.

TL;DR: Age-dependent distributions of enzymatic activities in the endo- and ecto-peritrophic space indicate that the peritrophic membrane establishes compartments within the midgut lumen.

TL;DR: Results indicate that seasonal diphenism in A. levana is controlled only by the timing of ecdysteroid release, which initiates adult development, and there is no direct influence of the brain on wing coloration.

TL;DR: Fanning behaviour inside the nest of honey bees is an effective mechanism of ventilation and bees show negative phototaxis, and the colonial respiratory activity decreases at night following a pronounced day-night cycle.

TL;DR: Cold-hardiness adaptations of an outdoor population of the goldenrod gall moth were profiled over the 1984–1985 winter and supercooling-point depression and glycerol systhesis both appeared to be initiated after the first overnight exposures to subzero temperatures.

TL;DR: Developmental patterns of low-temperature tolerance and glycerol production were determined for larval, pupal and adult stages of the flesh fly Sarcophaga crassipalpis Macquart (Diptera:Sarcophagidae).

TL;DR: Eggs laid by females of Apanteles kariyai were encapsulated, which suggests that the fluid is necessary to enable the parasitoid eggs to escape the cellular defence reaction of the host.

TL;DR: Phagocytosis as an immune response remained essentially intact, and was capable of completely clearing both yeast and Escherichia coli cells injected into the haemocoele, which is assumed that prohaemocytes may represent a target cell population.

TL;DR: It is suggested that mycetocyte loss may represent an important means by which the symbiont population is regulated and can be interpreted as evidence for substantial variation in the characteristics of nutritional interactions between the aphid and its symbionts with age and morph of the aphids.

TL;DR: The levels of PTTH in pre-diapause and day-35 post-pupariation diapause brains of Sarcophaga were shown to be similar to those of non-diAPause destined prepupal brains, suggesting the involvement of a cyclic nucleotide-mediated secondary messenger system.

TL;DR: Fifth-instar Heliothis virescens larvae did not pupate after injections of Campoletis sonorensis calyx fluid in or before the burrow-digging stage of development and ecdysteroid production ceased for up to 10 days, indicating that C. sonoracic glands of 5th- instar H. vires censored may be affected by calyx-fluid injection.

TL;DR: Larvae of Ceratitis capitata were tested for preference for different diets based on the ingredients of the standard diet used to rear flies in the laboratory, and showed that larvae are able to recognize the diets that are best from a nutritional viewpoint.

TL;DR: Results indicate that the hormonal substance is proteinaceous and may have a blocked NH2-terminus, and occurrence of pheromonotropic activity in brain + sub-oesophageal ganglion homogenates from other moth species and a species of cockroach indicates the wide distribution of hormones with similar activity.

TL;DR: Results obtained from females held under continuous darkness following their first night of calling confirmed that the periodicity of pheromone titre, like that of calling behaviour, is circadian.

TL;DR: The supply of male secretions constitutes an important trophic contribution that increases females' fecundity and vitellogenesis and the extent of its importance are analyzed in Caryedon serratus.

TL;DR: The location of blockage factors appears to be situated in the central nervous system and the effect is dependent on the balance of developmental hormones at the time of treatment.

TL;DR: Neural input from the brain or other higher centres of the nervous system, however, appeared critical since females which received ventral nerve cord transection anterior to the terminal abdominal ganglion between 0 and 24 h after pupation showed significant reductions in both gland-extractable pheromone and phersomone emission rate.

TL;DR: When examined by task specialization, foragers produced higher levels of benzyl acetate, benzyl alcohol, and 2-nonanol than guards, fanners, or comb bees respectively.

TL;DR: The results suggest that azadirachtin affects H. virescens in a manner similar to other tested species of insects, especially regarding hormonal events in the insects.

TL;DR: The carbohydrate metabolism in Manduca sexta underwent significant changes during late larval development and it appears that fat body glycogen might be broken down during the last larval moult and the wandering period to provide substrates for chitin synthesis.

TL;DR: The ovaries of female burying beetles undergo rapid maturation after locating a small vertebrate carcass necessary for reproduction, and the proximate cue which triggers this development is the behaviour of the female herself.

TL;DR: Hydrocarbons were an important constituent of the cuticular lipids of all three species; smaller quantities of wax and cholesterol esters, triacylglycerols, free fatty acids, alcohols, and cholesterol were also detected.

TL;DR: It is demonstrated that photoperiodic induction of the silkworm can be programmed in in vivo and in vitro culture systems, and that components of the photoperperiodic clock (photoreceptor, clock, and counter system) are located in the brain-suboesophageal ganglion complex, possibly in the head itself.

TL;DR: A 20:80 diet may be nutritionally unsuitable because it does not match closely enough the varying needs of the insect throughout the stadium.

TL;DR: The abdominal cuticles of the adult female ticks Argas (Persicargas) robertsi and Boophilus microplus, sp der Badumna insignis, tsetse fly Glossina morsitans mors Titans, sheep ked Melophagus ovinus and locust Locusta migratoria migratorioides and of the fifth-instar larva of the bug Rhodnius prolixus stretch greatly.

TL;DR: Male mating behaviour was studied by treating a pseudofly, newly emerged female or male fly, with all possible combinations of ( Z )-9-tricosene, the non-hydrocarbon fraction and the methylalkane fraction, indicating that theNon-Hydro carbon fraction contains sex recognition factors.