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Showing 1 to 20 of 43 for “"crickets"”.
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Rapid coordinate system creation and mapping using Crickets
In this thesis, I describe a system that lays the foundation for context-aware applications. This system allows a user to set up a reference coordinate system in a room, using three Cricket listeners attached to a wooden frame. The system then assigns coordinates to Cricket beacons, which are …
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Transgenerational Effects of Maternal Age on Offspring Fitness in Crickets
<p>Advanced parental age is an important aspect of parental condition that can have both positive and negative effects on offspring fitness, and thus, parental age can be considered a parental effect. As a parental effect, parental age may affect a variety of offspring traits and may cascade to …
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Motor control and directional accuracy of phonotaxis in female field crickets
… of the phonotactic behavior of female field crickets (Gryllus bimaculatus) as they orient towards singing males: the first one is how the auditory input is integrated into the motor activity underlying their walking responses, and the second one is how accurately they can localize a singing …
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Behavioural and neural studies of male singing and female phonotaxis behaviour in crickets
Acoustic communication in crickets is achieved by the production of calling, courtship, and rivalry songs in male crickets and the recognition of the songs by conspecifics. Male crickets sing by rhythmically opening and closing the forewings to generate sound pulses and song patterns. The central …
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Activity and Structure of Auditory Brain Neurons Underlying Phonotactic Behaviour in Female Crickets
A long-standing question in cricket neurobiology is what kind of neuronal mechanism the females use, to recognise the temporal pattern of the male calling song. A delay-line and coincidence detector circuit with five neurons underlying auditory pattern recognition in the bi-spotted cricket Gryllus …
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The survival of grasshoppers and bush crickets in habitats variable in space and time
Die zunehmende Nutzung von Landschaften führt zu einer steigenden Fragmentierung schützenswerter Flächen. Damit verbunden ist eine Zerschneidung von großen Populationen in Metapopulationen. In solchen Fällen bestimmt das Gleichgewicht zwischen Aussterben und Besiedlung von Habitaten die regionale …
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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
… 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 secretion of chitinase was affected by the moulting cycle of the insects reaching maximum activity at the day of moult. Therefore, chitinase …
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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)
… into lipid by the fat body from adult crickets in vitro. AKH inhibits palmitate incorporation into lipid to a small extent, however, it does not influence the incorporation of palmitate into different lipid classes. In the presence of AKH, glycerol incorporation into lipid by the adult …
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Systematics of Tridactyloidea (Orthoptera: Caelifera): Taxonomic revision of extinct taxa with comments on extant taxa
… of minute (0.5 mm) to medium-size (9 cm) crickets. Tridactylidae, pygmy mole crickets, are globally distributed, whereas mud crickets in Ripipterygidae and sandgropers in Cylindrachetidae have Neotropical and Austral distributions, respectively. The taxonomy of this superfamily was …
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Morphological Variation and Community Science in Orthoptera
… we compare phenotypic divergence among 4,221 crickets from 337 populations 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 …
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Machine learning methods for individual acoustic recognition in a species of field cricket
Crickets, like other insects, play a vital role in maintaining a balance in the ecosystem. Therefore, the ability to identify individual crickets is crucial as it enables ecologists to estimate important population metrics such as population densities, which in turn are used to investigate …
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Control of the release of digestive enzymes in the cricket Gryllus bimaculatus and the fall armyworm, Spodoptera frugiperda
… and amylase are secreted in the caecum of fed crickets than in unfed crickets, but basal levels of certain enzymes are released continuously even in unfed animals. A variable ratio of nutrients in ingested food leads to a different ratio of digestive enzyme release, but a high nutrient …
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An analysis of phonotactic behaviour in the cricket Gryllus bimaculatus
… of substrate texture on walking performance in crickets. Substrate texture is found to play an essential role in the phonotactic responses of G. bimaculatus. Smooth substrate texture has a detrimental effect due to slipping, whereas a rough texture results in optimal walking performance due to …
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Attractive silences in cricket courtship song : mate choice using a short-range signal /
… on the short-range acoustic courtship song of crickets. The results presented here suggest this signal is under selection by female choice. Females mated preferentially with males having shorter silences between the two types of ticks within the song. The length of these silences (Gap 1) 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
… the amount of food consumed was reduced. •When crickets were fed on artificial diets from penultimate larval stage, they displayed a lower increase in body mass and some reduction in flight muscle and ovary mass compared with crickets fed on artificial diet from the day of the adult moult only. …
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Isolation and characterization of the B-type allatostatin gene of Gryllus bimaculatus de Geer (Ensifera, Gryllidae)
… ecdysteroid 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. …
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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
… was seen with ecdysone titers. Mated female crickets experienced a JH III titer increase on day 4 which coincides with egg deposit on day 4. Ecdysone titers reach a maximum on day 3 and ovary weights on day 4. Besides JH III, JH I was found in 5 to 8-day old female adult crickets, and in 6 …
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Autonomous cricket biosensors for acoustic localization
… cerci. Whereas previous investigations explored crickets' neurological response to near field flows generated by single frequency steady-state sounds, we investigated the effects of transient waveforms, which better represent real world stimuli, and to which the cercal system appears to be most …
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An intelligent home using wireless location networks and real time messaging for patients with heart failure
… of the technologies used in this project include Crickets, an indoor positioning device, handheld computers, and location tracking and instant messaging software. The proposed design and architecture for the intelligent home and the metrics it obtains are evaluated from both a theoretical and …
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The role of the abdominal pump in tracheal tube collapse in the darkling beetle, Zophobas morio
… some insects (such as beetles, ants, and crickets) create convection in the respiratory system by compressing their tracheal tubes, yet the underlying physiological mechanisms of tracheal collapse are also unknown. This study aimed to investigate the relationship between abdominal pumping …
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