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Showing 1 to 20 of 34 for “"Grasshoppers"”.
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Justice for Grasshoppers
This dissertation engages with the question of how much access to free time citizens should enjoy in a just society. A sophisticated liberal egalitarian approach holds that social justice requires protecting at least the freedom to work no more than 8 hours per day. It is unclear whether this …
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The Humidity Reactions of Grasshoppers
Made available in DSpace on 2014-12-05T21:33:51Z (GMT). No. of bitstreams: 1 0009127.pdf: 3289476 bytes, checksum: 607f24578e786cb50914cc802a0694ce (MD5) Previous issue date: 1954
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Interactions between Bromus tectorum, grasshoppers, and native plants in sagebrush steppe communities
… exotic proliferation. In sagebrush shrubland, grasshoppers are often the dominant herbivores. Their feeding patterns have been shown to limit and structure plant distributions. The objective of this study was to elucidate whether grasshoppers may be promoting B. tectorum spread through …
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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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Developmental and reproductive ecology of Melanoplus femurrubrum (De Geer) and some other melanopline grasshoppers (Orthoptera, Acrididae)
… the number of instars, and developmental rate. Grasshoppers with fewer instars had the differential number of instars deleted from between the third and penultimate instars, thus, temperature must affect instar number early in the life cycle, i.e., before the third instar. The laboratory study …
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A Study of the Sculpture of the Chorion of the Eggs of Eighteen South Dakota Grasshoppers (Acridiidae)
<p>The most destructive grasshoppers that occur in South Dakota are those belonging to the genus Melanoplus. Of those, the common and harmful species are Melanoplus bivittatus (Say) and Melanoplus differentialis (Thomas). Other species that are of considerable economic importance, and, at times, …
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The impact of megaherbivore grazers on grasshopper communities via grassland conversion in a savannah ecosystem
Grasshoppers are sensitive indicators of the state of disturbance of grassland ecosystems. This study examined the grasshopper communities inside a game reserve, comparing those found on frequently grazed areas with communities inside plots that exclude megaherbivores. The vegetation inside the …
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Food Habits of the Sharp-Tailed Grouse (Pedioecetes Phasianellus Jamesi) and The Greater Prairie Chicken (Tymphanuchus Cupido Pinnauts) In Western South Dakota
… for 63 sharptai8ls during spring. Short-horned grasshoppers (Acrididas) were the most important insect item by volume for summer, fall, and winter. Preference indices for food items taken by 48 adult sharp-tailed grouse during summer indicated selectivity for rose (Rosa arkansana) hips, …
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Translocation site selection for the nationally endangered grasshopper species Brachaspis robustus : A thesis submitted in partial fulfilment of the requirements for the Degree of Master of Science at Lincoln University
… successful egg diapause, a necessary part of the grasshoppers’ development. These sites were evaluated for key threats to the species and how to mitigate them, as well as habitat suitability. A capture-mark-recapture study was done to determine the area individual grasshoppers occupy to inform us …
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Observations on the biology of Schistocerca venusta
… venusta Scudder,</em> is one of the most common grasshoppers to be found in the San Joaquin Valley and environs. Despite the fact that the insect is commonplace, very little work has been done on its biology. It was the purpose of this study, therefore, to learn by field and laboratory …
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Grasshopper species complexes of forage crops in the piedmont region of Virginia
Field collections of grasshoppers (Orthoptera: Acrididae, Tetrigidae, and Tettigoniidae) from twenty hayfield and pasture sites in twelve counties in Virginia were made in 1979 and 1980. Fifteen Acrididae, two Tetrigidae, and six Tettigoniidae species were found among the 20,793 grasshoppers …
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A Community's Natural Resistance to Invasion by Cheatgrass and the Effects of Associational Herbivory
… was a highly utilized food source for generalist grasshoppers, (2) among native plant species, the amount of herbivory corresponded with their total percent nitrogen and other plant traits, and (3) a native grass, Elymus elymoides, experienced higher herbivory in high- than in low-density …
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Evaluation of chitinous materials as a feed for ruminants
… vivo rumen fermentation. Samples of cockroaches, grasshoppers, shrimp shells, crabmeal, and purified chitin were placed in the rumen of fistulated steers. Average rumen solubility (weight loss from a nylon bag) of 66.5. 32.0, 17.4, 35.7, and 21.5%, respectively, were observed. Measurements of …
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Physical and biochemical properties of entomopathogenic fungal spores
… spores in higher densities. The infection of grasshoppers by spore ingestion was efficacious, and the palps and the mouthparts were found to be the primary infection sites, not the alimentary tract. Hydrophobicity was not found to be a major determinant of spore association with grasshoppers, …
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Biodiversity of urban brownfields: modelling species occurrence and persistence in dynamic habitats
… models for vascular plants, leafhoppers and grasshoppers revealed the importance of spatio as well as temporal factors driving species occurrence. Furthermore, optimal settings for urban planning were identified. A dynamic metapopulation model supported these results by demonstrating the …
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Seasonal dietary composition of the eastern coyote (Canis latrans) on the berry college campus in Northwestern Georgia
… fall, and arthropod consumption (predominantly grasshoppers) was constant throughout the year, except during winter months. Prey classes Artiodactyla and Lagomorpha were consumed year round, although fawns were an important prey item only in spring and summer months and eastern cottontails were …
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Effect of nestling sex ratio on the provisioning behavior of adult Eastern Bluebirds (Sialia sialis)
… items. Of prey items I was able to identify, grasshoppers (<em>Orthoptera</italic>) were the most common prey delivered to nestlings by both male and female bluebirds. Other common prey items included Lepidopteran larvae, beetles (<em>Coleoptera</italic>), crickets (<em>Orthoptera</italic>), …
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