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Showing 1 to 15 of 15 for “"gut content analysis"”.
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Gut content analysis of trapped mustelids and trend analysis for ship rats and stoats over six trapping seasons at Mount Taranaki : A thesis submitted in partial fulfilment of the requirements for the degree of Master of Natural Resource Management and Ecological Engineering at Lincoln University
… where they are most needed. In this study, the gut content of 31 stoats, nine weasels and five ferrets were examined from Mt Taranaki and 82 stoats, 25 weasels and 28 ferrets from the surrounding farmland (ring-plain). There was a significant difference in the gut contents of the mustelids …
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Arthropod Predation in Brassica Agroecosystems: Effects of Latitude, Community Composition, and Diet Breadth
… I first tested methods to improve molecular gut content analysis of arthropod predators by verifying broad metabarcoding results with species-specific melting curve analysis. This study documented common false positive and false negative taxonomic results and suggested that a species-specific …
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Diets of fishes among and within ecoregions of the US and Mongolian rivers
Gut content analysis is a low cost and straightforward tool that allows for the investigation of multiple relationships within and among fishes. This tool allows for the identification of specific diet items that can be used to identify key dietary components, predation habits of species of …
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Naturalization of Salt Marsh Restoration Sites in the Elizabeth River, Virginia, Assessed by Feeding Activity and Trophic Level of Mummichogs (<i>Fundulus Heteroclitus</i>)
… several salt marsh restorations. By examining gut contents and stable isotopes values (δ13C and δ15N) from mummichogs (Fundulus heteroclitus), the functional equivalency of restored salt marshes compared to natural marshes was measured. In July 2013 I collected mummichogs from three restored …
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Habitat, distribution, and diet of the Tennessee Bottlebrush Crayfish (Barbicambarus simmonsi)
… B. simmonsi and B. cornutus using stable isotope analysis and gut content analysis, and determine if there was correlation between carapace length and trophic position for each species. Crayfish for the analysis were collected during the fall of 2012 and the spring of 2013. My results indicate …
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Impacts of introduced crayfish on Ash Meadows aquatic communities: Ash Meadows National Wildlife Refuge, Nevada
… fish abundance and condition with stable isotope analysis and gut content analysis or crayfishes to better understand the interactions which the invasive P. clarkii has with the endemic system. Invertebrate communities, specifically snail populations, are less diverse in those springs with …
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Abiotic and biotic factors influencing the decline of native unionid mussels in the Clinch River, Virginia
… videotape, dye studies in a feeding chamber, and gut content analysis were used to determine mechanisms of feeding, the primary food source, and the origin of substances taken up by juveniles. Exposure to sediment came not only through direct contact, but also through filtration of interstitial …
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Influence of riparian forest and agricultural land use on community structure and ecosystem function in headwater streams
… on stream community structure. Stable isotope analysis (13C and 15N) was performed to examine food web structure and energy flow within each stream to determine how land use changes affect ecosystem function and identify potential mechanisms for observed differences in community structure. To …
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The impact of seasonally changing feeding habits on the secondary production and accumulation of mercury in a filter-feeding Caddisfly
… absent from late November through March. Gut content analysis revealed seasonal patterns in the consumption of various food items. From April through October, when feeding nets were widespread, detritus formed the bulk of the diet in terms of both numbers of particles and volume occupied. …
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Ecological implications of introducing Leucaspius delineatus (Heckel, 1843) and Pseudorasbora parva (Temminck and Schlegel, 1842) into inland waters in England
… invasion was evaluated by stomach flushing and gut content analysis of native piscivorous fishes.Inter-population variability in life histories and morphological characters were observed in both sunbleak and topmouth gudgeon. Populations of both species matured at small body sizes and between …
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Energy Reserves in Native Freshwater Mussels (Bivalvia:Unionidae) with and without Attached Zebra Mussels: Effects of Food Deprivation
… through glycogen analyses of mantle tissue and gut content analysis. Specimens of Amblema p. plicata (Say, 1817) and Quadrula p. pustulosa (I. Lea, 1831), collected from a heavily infested reach of the Ohio River in 1996, had significantly lower (p<0.05) glycogen levels than specimens collected …
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Detached macrophyte accumulations in surf zones: Significance of macrophyte type and volume in supporting secondary production
… through laboratory trials and field experiments. Gut content analysis was used to examine the importance of wrack-associated invertebrates as a food source for fish, while stable isotope analysis (carbon, nitrogen and sulfur) and lipid analysis (lipid class and fatty acid composition) were …
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Predation Vulnerability and Trophic Interactions of Pallid Sturgeon Scaphirhynchus albus
… tested in this study. We used stable isotope analysis (SIA) to explore size-dependent feeding patterns for pallid sturgeon and shovelnose sturgeon Scaphirhynchus platorynchus in the Missouri River. Pallid sturgeon δ15N values (12.8 to 17.0 ‰) were positively related to fork length (325 to 1187 …
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The movement behavior and reproductive ecology of western corn rootworm beetles (coleoptera: chrysomeliae) in Bt cornfields with structured and seed blend refuges
… 0% refuge from 2010 to 2012. By testing beetle gut contents for the presence of specific Cry proteins and comparing them to the Cry proteins expressed by plants at their collection site, recent movement could be detected. These findings are presented in Chapters 2 and 3 of this dissertation. In …