Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 22 for “"dietary overlap"”.
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Are Cape Cormorants (Phalacrocorax capensis) losing the competition? Dietary overlap with commercial fisheries
… interactions. Therefore, long term studies on dietary changes provide insights into the nature of competition and overlap between seabirds and fisheries. The Cape Cormorant Phalacrocorax capensis breeds in the Benguela upwelling region of southern Africa. Its population has decreased by over …
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Dietary Shifts, Niche Relationships and Interspecific Competition in Sympatric Grey Langur (Semnopithecus entellus) and Purple-faced Langur (Trachypithecus vetulus) in Sri Lanka
… dissertation, I present data and analyses on the dietary ecology, ranging behavior, and interspecific interaction in Trachypithecus vetulus and Semnopithcus entellus. I use this work to assess the possible role of interspecific competition on the behavior and ecology of these species. I …
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A multi-indicator approach to dietary assessments within Lake Michigan's nearshore area
… and their spatial heterogeneity. Traditional dietary assessment methods of examining individual’s stomach contents provide valuable data quantifying relationships, however what is incorporated into organisms is not always proportional to what is consumed. Biochemical compounds have recently …
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Nutritional Condition of White-Tailed Deer in the Central Black Hills, South Dakota: Influence of Habitat and Elk Competition
… CBH. Also, elk diet composition and quality, and dietary overlap between elk and deer was determined. Habitat variables were measured at 1,241 random locations on each study area and on seasonal ranges. Deer and elk fecal pellet groups were collected at two-week intervals during June-August of …
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Structure of an Ensemble of Insectivorous Bats
… allow for spatial, temporal, behavioural and dietary partitioning including wing morphology, echolocation characteristics, flight behaviour, habitat use, and diet. Using acoustic arrays I compared activity patterns at different sites to determine temporal and spatial partitioning and generated …
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Prey Selection by Young Lemon Sharks (Negaprion brevirostris) at Chandeleur Island Nursery Habitats with a Comparison to Three Other Co-Occurring Shark Species
… feeding by young lemon sharks suggests minimal dietary overlap with other local shark species, resulting in minimal competition for resources.
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Potential for resource competition between the boodie (Bettongia lesueur) and mala (Lagorchestes hirsutus) in the fenced Matuwa reserve, central Western Australia
… of central Western Australia. Resource overlap between coexisting populations of these two species has not been studied previously, but the literature suggests the potential for considerable dietary overlap. I investigated the degree of dietary overlap using scat DNA from non-invasively …
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The ecology of the two-spined blackfish Gadopsis Bispinosus (Pisces: Gadopsidae)
… importance to immature fish, but were a major dietary item of adults. Terrestrial items were most abundant in the diet of both immature and adult fish in summer and autumn. The diet of Rainbow Trout 0. mykiss was also examined, with significant dietary overlap apparent between 0. mykiss and G. …
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The ecology of the two-spined blackfish Gadopsis Bispinosus (Pisces: Gadopsidae)
… importance to immature fish, but were a major dietary item of adults. Terrestrial items were most abundant in the diet of both immature and adult fish in summer and autumn. The diet of Rainbow Trout 0. mykiss was also examined, with significant dietary overlap apparent between 0. mykiss and G. …
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Effects of Fire on the Nutritional Ecology of Selected Ungulates in the Southern Black Hills, South Dakota
… in fall than summer. Burned habitat reduced dietary overlap of elk and white-tailed deer but increased dietary overlap of white-tailed deer and mule deer, and mule deer and elk, in winter. In summer, burned habitat reduced competition between cattle and deer but increased competition for all …
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Exotic Armored Catfishes in Texas: Reproductive Biology, and Effects of Foraging on Egg Survival of Native Fishes (Etheostoma fonticola, Endangered and Dionda diaboli, Threatened)
… exotics could affect native species through dietary overlap, egg predation, and other factors. This study focused on two related topics: 1. the reproductive biology of Hypostomus in the San Marcos River, Texas; and 2. the potential effect of the foraging activities of the exotic on the egg …
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Interference in White Bass Reproduction by Two Introduced Predators in Barren River Lake, Kentucky
… index values revealed a significant degree of dietary overlap between white bass and yellow bass in larval fish, post larval fish, and arthropods (Cxy = 0.992,0.994, and 0.804, respectively), and between white bass and hybrid striped bass in arthropods (Cxy = 0.851). Information from this study …
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Biology and ecology of bigheaded carp in an invaded ecosystem
… isotope analysis indicated that there was little dietary overlap between bigheaded carps and native planktivores. Additionally, there was seasonal variation in resource use that may function to minimize this overlap. Overall, many of the variables examined in these studies may be influential in …
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Investigations of the Trophic Relationships, Feeding Ecology and Feeding Behavior of Larval Spot, <i>Leiostomus Xanthurus</i> Lacepede, and Atlantic Croaker, <i>Micropogonias Undulatus</i> (Linnaeus) (Pisces:Sciaenidae)
… two species converged with age and interspecific dietary overlap was relatively high for both flexion stages. Inter- and intraspecific competition were probably not important determinants of diet composition because of the apparent absence of starvation. In contradistinction, the degree of food …
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Life History Variation of Common Terns in the Gulf of Maine
… terns. Competition was determined by overlap of carbon and nitrogen stable isotopes in juvenile feathers and Morisita's index of dietary overlap for observed prey deliveries by adults to juveniles. Competition could exist between arctic and common terns on Matinicus Rock, an offshore …
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Examining the feeding ecology of two mesopelagic fishes (Lampanyctodes hectoris & Maurolicus walvisensis) off the west coast of South Africa using stable isotope and stomach content analyses
… occurrence (%F), numerical abundance (%N), and dietary carbon (%C). Both mesopelagic species occupied different isotopic niches that were separated by their δ15N values across a similar δ13C range. Furthermore, the relationship found between trophic position and standard length emphasizes the …
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Diet of the Tropicalised Herbivore Siganus fuscescens Across a Broad Latitudinal Gradient and Comparisons With Temperate Seagrass-associated Omnivorous Fishes
… In all regions, red algae were the primary dietary component. Leathery macrophytes were also consumed in the temperate region, while filamentous Sphacelaria was grazed in subtropical Shark Bay and corticated foliose Dictyota in the tropical Kimberley. Seagrass was consumed in all regions, …
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Ecology of feral cats Felis catus and their prey in relation to shrubland fire regimes
… need for more rigorous field studies. I examined overlap in resource use between cats and dingoes using remote camera surveys and dietary analysis of scats. Both carnivores were recorded in all four major habitat types: recently burnt shrublands (10 to 14 years since last fire), long unburnt …
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Raptor Use of the Idaho National Engineering Laboratory
… the Big Lost River. Food habits comparisons show dietary overlap between Swainson’s hawks, red-tailed hawks, and great horned owls. Ferruginous hawks and long-eared owls had little overlap with other species. Continued monitoring of raptors on the INEL through prey fluctuations would provide …
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Assessment and prediction of the potential threats of temperature change and invasive species to the sustainability of Northern Irish sea fisheries
… assess the abundance, prey selection, degree of dietary overlap, in a commercial predator, cod (Gadhus morhua; Linnaeus, 1758) and a non-commercial predator, dogfish (Sycliorhinus canicula; Linnaeus, 1758) with regards to substrate type. While there were no significant conclusions to be made …
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