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Showing 1 to 20 of 30 for “"gut content"”.
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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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The Food Habits of the Amphipod Gammarus Pseudolimnaeus (Holsinger) in the Upper Region of Lake Taneycomo as Related to the Benthic Diatom (Bacillariophyceae) Microflora
Diatoms are found to be present in the gut contents of G. pseudolimnaeus collected from selected sites on Lake Taneycomo, Taney County, Missouri. Data presented are representative of collections made during the summer of 1987. Gut content analyses indicate that with respect to diatoms G. …
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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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Development of an Algal Diet for Rearing Juvenile Freshwater Mussels (Unionidae)
… At the conclusion of the feeding trials, the gut contents of mussels were analyzed for preferential ingestion. The mussels selected for N. oculata and S. capricornutum over S. quadricauda (p < 0.05). This may be an indication of particle size-dependent selection. Feeding trials also suggest …
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Influence of riparian forest and agricultural land use on community structure and ecosystem function in headwater streams
… in food web structure, stable isotope and gut content analyses were combined to better quantify fish diets and explain variation in trophic position among species and land use groups. Gut content analysis revealed that fish in forested streams had a more diverse diet that included greater …
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Distribuição, alimentação e período reprodutivo de duas espécies de Tetragonopterinae (Osteichthyes) sintópicas no rio Ubatiba (Maricá, RJ)
… mature females through the year. The analysis of gut content defined both species as being generalist, but with a predominance of items of allochthonous origin in the diet of A. janeiroensis. Despite the great niche overlap, competitiva interactions is perhaps being minimized by food abundance and …
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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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Stable carbon and nitrogen isotope ratios in the shallow-water cape hake, merluccius capensis (castelnau) as indicators of trophic position and diet on the west and south coasts of South Africa
… South Africa, and five sites on the south coast. Gut content analyses show only the very recent diet of hake, therefore stable carbon and nitrogen isotope ratios were used to show the longer-term diet, integrated over the turnover time of the muscle tissue and bone collagen analysed. 13C/12C is …
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Biotic and abiotic interactions of deep-sea hydrothermal vent-endemic fish on the East Pacific Rise
… Thermichthys hollisi. Stable isotope and gut content analyses were used to elucidate prey choice and trophic relationships. Otolith chemical signatures were investigated to determine whether this technique could be utilized to examine life history strategy and habitat use. Chemical …
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Habitat, distribution, and diet of the Tennessee Bottlebrush Crayfish (Barbicambarus simmonsi)
… 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 both species …
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Development of a suitable diet for endangered juvenile oyster mussels, Epioblasma capsaeformis (Bivalvia:Unionidae), reared in a captive environment
… sites on the Clinch River and sacrificed for gut content and biochemical composition analyses in summer. Feces and pseudofeces from live river-collected juveniles were examined seasonally for algae, detritus, and bacteria to qualitatively determine diet of specimens. Two feeding trials also …
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Aspectos da biologia e ecologia de Callibaetis guttatus Navás, 1915 (Insecta: Ephemeroptera: Baetidae) em alagados temporários da Restinga de Maricá, Estado do Rio de Janeiro, com considerações taxonômicas
Aspects on the biology and ecology of Callibaetis guttatus Navás, 1915 (Insecta: Ephemeroptera: Baetidae) in temporary water bodies of Restinga de Maricá, Rio de Janeiro State, with taxonomical notes. Some aspects on the biology and ecology of C. guttatus were studied since 1986 , in Brejo-canal de …
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Impacts of introduced crayfish on Ash Meadows aquatic communities: Ash Meadows National Wildlife Refuge, Nevada
… 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 crayfish. Fish …
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Biotic and abiotic interactions of deep-sea hydrothermal vent-endemic fish on the East Pacific Rise
… Thermichthys hollisi. Stable isotope and gut content analyses were used to elucidate prey choice and trophic relationships. Otolith chemical signatures were investigated to determine whether this technique could be utilized to examine life history strategy and habitat use. Chemical …
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Diet of the Tristan rock lobster Jasus tristani following the 2011 soya spill at Nightingale Island
… across the three islands, and a combination of gut content and stable isotope (SI) analysis was conducted to assess the dietary components of the lobsters. Gut fullness was significantly less at Nightingale Island suggesting there may be less food available on the reef. Statistical analyses …
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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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Trophic transfer of nearshore basal resources: interpreting fatty acid and stable isotope biomarkers
… such as surveys of macrophyte biomass or gut content analyses. Biochemical markers such as fatty acids (FA) and multiple stable isotopes (MSI; collectively FAMSI) can help resolve which sources are actually important in consumers, but several key uncertainties in the assumptions of the …
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Reef fish demographics on Louisiana artificial reefs : the effects of reef size on biomass distribution and foraging dynamics
… ecology was assessed with a combination of gut content and stable isotope analyses to examine both prey and sources of basal resources to the reef habitats. Results indicate that red snapper are opportunistic feeders, and that artificial reef structures do not provide a unique set of prey …
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