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 26 for “"prey selection"”.
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Breeding Biology and Prey Selection of Ferruginous Hawks in Northwestern South Dakota
A study of the breeding biology and prey selection of ferruginous hawks (Buteo regalis) was conducted in northwestern South Dakota during 1976 and 1977. Twenty four pairs were located in 1976 and 18 pairs attempted to nest; 17 pairs located in 1977 attempted to nest. The ecological density of …
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Daily ration, feeding periodicity and prey selection of sauger (Stizostedion canadense) in the Ohio River
… during June 1980 - August 1981. Abundance of prey items in the river was assessed from seine samples collected at similar sites during the same period. Gizzard shad were the most abundant prey in sauger stomachs, comprising 42% of all identified prey, followed by emerald shiners (28%), …
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Effects of the Exotic Cladoceran Daphnia Lumholtzi (Sars) on the Growth Rate and Prey Selection of Bluegill Sunfish (Lepomis Macrochirus Rafinesque)
… bluegill sunfish (15-25, 30-40, and 50-60 mm). Prey selectivity values also were determined for each of the zooplankton species from the exotic community type for each of the tree bluegill size classes. Results indicated that food level had strong effects on growth rates of all bluegill size …
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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
… habitats for lemon sharks that provide abundant prey and protection from predation. Other local shark species (Atlantic sharpnose, bull, and blacktip sharks) co-occur with lemon sharks in the same region, including the nearby Biloxi Marshes. To better assess how lemon sharks use these nursery …
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Feeding Selectivity and Habitat Usage of <i>Esox americanus</i>
<p>Patterns of piscine prey selection and habitat usage of <em>Esox americanus</em> were assessed through a series of field and experimental studies. Although few detailed studies exist on the foraging behavior and habitat usage of <em>E. americanus</em>, throughout its range it may be an important …
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The ecology of larval and juvenile fishes in lowland rivers, with particular emphasis on foraging
… and inter-specific influences affecting the prey availability, feeding ecology and condition of 0+ fishes were studied in experimental and wild conditions to improve the understanding of feeding ecology for 0+ fishes in rivers and the effect this has on the health of the individual fish.This …
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Modelling foraging behaviour in the insect predator Notonecta maculata using the individuals approach
… parameters that were considered influential in prey selection were quantified experimentally and subsequently led to the parameterization of an individuals model to be used for the prediction of predation rates. Testing the model against independent data revealed that prey selection in …
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Exploring physical, biological, and behavioral processes that affect larval fish distribution in the pelagic zone of Lake Michigan
… how two of these factors (light intensity and prey density) influence the foraging success of a fish species with a pelagic larval stage, yellow perch (Perca flavescens). To determine vertical distribution, the upper 27 meters of the water column was divided into six discrete depth bins where …
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Spatial, Seasonal, and Size-Dependent Variation in the Diet of Sacramento Pikeminnow in the Main Stem of Chorro Creek, Central Coast California
… mykiss) and their anadromous form (steelhead). Prey was identified in 88% of the samples collected in the early season and 84% of the samples collected in the late season. Fish and/or scales were identified in 12% of the samples collected. Sacramento pikeminnow consumed a wide variety of prey; …
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Late Pleistocene and Early Holocene Small Mammals in South West Britain: Environmental and Taphonomic Implications, and their role in Archaeological Research
… of the past environment unaffected by human selection of particular species, as might be the case in larger mammal assemblages. An examination of possible agents of accumulation is provided for each site to identify any bias introduced by prey selection. Reconstructions of the environment …
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Sensory exploitation and condition indication may explain red pelvic spines in the brook stickleback Culaea inconstans
… evolve in a nonsexual context such as prey selection. Indicator models predict that sexually selected traits indicate mate condition. I investigated the potential for sensory exploitation and condition indication models to explain the evolution of what appears to be a recently evolved …
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Ecology Of Coyotes (canis Latrans) In The Greater Detroit Area Of Southeastern Michigan
… rabbit, and small rodents were the most consumed prey in both urban and suburban areas. Coyote consumption of white-tailed deer biomass was 7.2% greater than expected in suburban areas and 10.0% less than expected in urban areas and the difference was significant (P < 0.004). More white-tailed …
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Determinants of Growth and Survival of Larval Pallid Sturgeon: A Combined Laboratory and Field Approach
… feeding in pallid sturgeon and quantified prey taxa-specific growth and survival for zooplankton and Chironomidae and Ephemeroptera larvae in discrete pallid sturgeon size classes (first feeding larvae, 20 to 30 mm, 30 to 40 mm). We quantified pallid sturgeon prey selection offering …
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Recruitment of Bluegill and Yellow Perch in Nebraska Sandhills Lakes: Integrating Multiple Life Stages
… a series of Nebraska Sandhills lakes, 2) larval prey selection and match- mismatch regulation of recruitment, 3) age-0 dynamics and the potential effect of abiotic and biotic variables on recruitment, and, 4) potential predation by yellow perch on age-0 bluegill. Results from this study …
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EPIBENTHIC INVERTEBRATES AND JUVENILE CHUM SALMON (ONCORHYNCHUS KETA) PREY AVAILABILITY ALONG AN ECO-ENGINEERED SHORELINE: A CASE STUDY AT THE SEAWALL IN SEATTLE, WASHINGTON
… Elliott Bay waterfront have shown that common prey of migrating juvenile salmon, small epibenthic crustaceans such as amphipods and harpacticoid copepods, are negatively impacted by pier shading, presumably due to the reduced light intensity necessary to support primary production, and that …
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Patterns of variation in the benthic macroinvertebrate community of the Upper Columbia River, WA
… potential suitability of the BMI community as a prey source in this crucial stage of development, I explored seasonal, annual and zonal differences in BMI density, biomass, diversity and community structure within the area of highest density for first-feeding sturgeon larvae. My results indicate …
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A System-Level Analysis of Migratory Shorebird Habitat Use, Diet, and the Influence of Climate-Driven Ecosystem Change in the Virginia Barrier Islands
… barrier island habitats and the invertebrate prey that sustain them during migration. I compared habitat use and prey availability across sand, peat, and mudflat substrates during spring migration (May 14 – June 2, 2023 – 2024) and used fecal DNA metabarcoding to examine diet and prey …
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TROPHIC ECOLOGY OF SAILFISH LARVAE IN THE GULF OF MEXICO: AN ANALYSIS OF DIET, PREY AVAILABILITY, PREY QUALITY, AND INFLUENCES ON LARVAL GROWTH
… was compared to environmental, spatial, diet, prey availability, and fatty acid metrics using data collected from near-surface waters in the northern Gulf of Mexico (2017 - 2019). Larvae exhibited a highly selective feeding strategy in early development and expanded their feeding niche to …
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Diet and Feeding Behavior of Juvenile Alligator Snapping Turtles (Macrochelys Temminckii) in Eastern Oklahoma
… River. Juvenile M. temminckii showed some innate prey preference and foraging capability. There were large declines in trapping rates of all species, composition of the aquatic turtle community changed dramatically, and changes in the M. temminckii population indicate that unknown factors have …
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Response of avian, arthropod, and vegetation communities to mid-contract management in Conservation Reserve Program tall fescue monocultures
… CRP, and 3) assess foraging rates and arthropod prey selection of bobwhite chicks relative to MCM. Spray and spray-seed treatments were more effective than disking at reducing tall fescue cover, increasing plant species diversity, and enhancing the structural characteristics of the plant …
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