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Showing 1 to 20 of 24 for “"Gryllus"”.
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Sperm utilization patterns in Gryllus integer (orthoptera: gryllidae
… to study sperm competition in the field cricket, Gryllus integer. Four experiments were conducted: a radiation and sterilization experiment, a diapause experiment, and 2 competition experiments. It was found that 7,000 rad of gamma radiation sterilized adult ~ integer males. There was no diapause …
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An analysis of phonotactic behaviour in the cricket Gryllus bimaculatus
… (i.e. attraction to sound) of the female Gryllus bimaculatus under laboratory conditions. Chapter 2 is the first study to analyze the effect of substrate texture on walking performance in crickets. Substrate texture is found to play an essential role in the phonotactic responses of G. …
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Effect of age on female choice in the field cricket, Gryllus interger
… selectivity. The effect of age on mate choice in Gryllus integer was investigated by using a non-compensating treadmill, called the Kugel, to measure female phonotaxis. Artificially generated male calling songs of varying pulse rates were broadcast in either a singlestimulus or a three-stimulus …
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Isolation and characterization of the B-type allatostatin gene of Gryllus bimaculatus de Geer (Ensifera, Gryllidae)
… biosynthesis in the ovary of adult crickets (Gryllus bimaculatus). To understand the mechanisms of function of the pleiotropic cricket B type allatostatins, it is necessary to characterize their gene (preprohormone) and study the spatial and temporal expression patterns of the gene. 2. By PCR …
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Sexual selections in the northern fall field cricket, Gryllus pennsylvanicus: a manipulation of the adult sex ratio
… were investigated in a polygynous species, Gryllus pennsylvanicus, where the potential exists for spatial/temporal fluctuations in sex ratio of field populations. Four different sex ratios (males: females, 5:0, 5:2, 5:5, 5:10) were investigated. Observations were conducted in late summer …
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The effect of diet and parasite load on female phonotaxis in the Texas field cricket, Gryllus integer
… of female quality on mate choice was examined in Gryllus integer by comparing the phonotactic responses of females on different diets and with different parasite loads to various synthetic models of conspecific calling song. Test females were virgin, 11-14 days old, and had been maintained on one …
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Effects of Wolbachia Bacteria on Several Insect Species
With the exception of Gryllus firmus all other members of the genus Gryllus tested were found to be infected with Wolbachia. Gryllus rubens was found to be infected with a strain different from that found in G. integer and G. pennsylvanicus. However, specimens from the Davis, CA and Las Cruces, NM …
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Control of the release of digestive enzymes in the cricket Gryllus bimaculatus and the fall armyworm, Spodoptera frugiperda
… the release of digestive enzymes in the cricket Gryllus bimaculatus and the fall armyworm, Spodoptera frugiperda. 1. Control of enzyme release in the cricket G. bimaculatus. Using flat-sheet preparations of the caecum, digestive enzyme release was investigated. More trypsin, aminopeptidase and …
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The signal transduction of the adipokinetic hormone and regulation of energy metabolism in the cricket, Gryllus bimaculatus de Geer (Ensifera: Gryllidae)
The fat body from the cricket, Gryllus bimaculatus incorporates acetate, glycerol or palmitate into lipid in vitro. Adipokinetic hormone (AKH) inhibits acetate incorporation into lipid by the fat body from adult crickets in vitro. AKH inhibits palmitate incorporation into lipid to a small extent, …
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The effect of social condition and diet on the frequency of male-male agonistic displays in the field cricket, gryllus bimaculatus /
… a laboratory terrarium using the field cricket Gryllus bimaculatus. The effect of energy constraints on display frequency was also determined. Half the males were fed a diet high in protein and fet; the other males were fed a lower quality diet, for a 7-11 day period. The frequency of five …
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The regulation of digestive enzyme release in the two-spotted field cricket Gryllus bimaculatus (de Geer): effects of endogenous and environmental factors
… enzyme release in the omnivorous cricket, Gryllus bimaculatus. The age-dependent enzyme release of carbohydrases, proteases and lipase correlates with the daily feeding rate of the crickets and peaked between days 2 to 4 in last instar larvae as well as in adult crickets. In contrast, the …
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The effect of gregarine parasite infections, age, and diet on calling song structure and mating behaviour in the Texas field cricket, Gryllus integer
… behaviour of the male Texas field cricket, Gryllus integer. Male calling songs were recorded in the laboratory using a Digital Signal Processing Network. The song parameters measured were: pulse rate, pulse width, burst duration, pulses per burst, interburst interval, and percent missing …
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Measuring juvenile hormone and ecdysteroid titers in insect haemolymph simultaneously by LC-MS: The basis for determining the effectiveness of plant-derived alkaloids as insect growth regulators
… abundant ions formed in haemolymph extract of Gryllus bimaculatus was the sodium adduct for JHs, JH diols and JH acids. At higher JH concentrations, the potassium adduct was also observed. The sodium and the potassium adducts were present in ecdysteroid analysis. The same ionization pattern was …
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Studies on the influence of different diets and rearing conditions on the development and growth of the two-spotted cricket Gryllus bimaculatus de Geer
… on larvae and adults of the two-spotted cricket, Gryllus bimaculatus de Geer (Orthoptera: Gryllidae), was studied. •The percent increase in body and ovary mass of adult females reared under crowded conditions was higher than that of those reared under isolated conditions. •Higher population …
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Mechanisms Underlying Variation in Insect Chill Tolerance: The Role of Ion and Water Transport
… the mechanisms are poorly understood. Using Gryllus crickets, I generated and tested hypotheses about the mechanisms underlying this variation in transport function. I first related interspecific variation in cold tolerance to water and ion balance in early chill coma. A rapid influx of Na+ …
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Isolierung und Charakterisierung von Iridoviren
… virus from commercially produced colonies of Gryllus bimaculatus in Germany, which showed apparent mortality. Transmission electron microscopy studies on adult cricket specimens revealed the paracrystalline assembly of icosahedral virus particles in the cytoplasm of hypertrophied abdominal fat …
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The genetic basis of the trade-off between wing morph and fecundity in the sand cricket, Gryllus firmus (Orthoptera, Gryllidae) : correlated response in the proportion macropterous when selecting for a decrease in fecundity
… (Roff, 1994a) conducted on the sand cricket, Gryllus firmus, documented a negative correlated response in fecundity to selecting on the proportion macropterous. The present study demonstrates that direct selection for decreased fecundity in G. firmus produces a correlated increase in the …
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Morphological Variation and Community Science in Orthoptera
… of two related species of field cricket, Gryllus firmus and G. pennsylvanicus and their hybrids. We find that these species differ across their geographic range in key morphological traits, such as body size and ovipositor length, and we directly compare phenotype with genotype for a …
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Dinamica de arvenses y entomofauna, bajo diferentes enmiendas nutricionales en nopal (Opuntia ficus indica L.) en Carazo
… de 11 especies de insectos (fitófagos como Gryllus sp L. y entomófagos como Mantis sp).
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Neurogenese, Wachstum und Integration von lokalen Nervenzellen in einem multisensorischen Neuropil im zentralen Gehrin adulter Insekten.
… olfaktorischen Verhaltens unentbehrlich ist.In Gryllus bimaculatus studieren wir die wachsende KCs in den MB- neuropiles in Verhältnis zu unterschiedenen MB Neuronen mit Immunlicht und Konventionelle Elektronenmikroskopie. Ein Konischer Block von ungefähr 100 wachsendes KCs, der von mitotischen …
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