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 15 of 15 for “"Fish predation"”.
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Aquatic insects versus fish: adaptations to fish predation
v češtině Tato bakalářská práce je rešerší dostupných zdrojů o adaptacích vodního hmyzu vůči rybí predaci během všech fází jejich vývoje. Vzhledem k tomu, že je vodní hmyz velká skupina často si nepodobných druhů, je vodní hmyz jako takový na úvod této práce představen, včetně prostředí, ve kterém …
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The structure of macrofaunal assemblages inhabiting an intertidal sandflat in Tomales Bay, California
… at assessing the effects of shorebird, crab and fish predation on certain infaunal and epifaunal invertebrates.
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Food Habits of Snakes in an East Texas State Fish Hatchery
… August 1969 to 1 August 1970 in the Jasper State Fish Hatchery near Jasper, Texas to determine the amount of predation by snakes on fish being propagated. The hatchery consisted of 63 earthen ponds. A total of 373 snakes were captured. Results of stomach contents analyses of the 206 snakes …
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Predation effects of benthivorous fish on stream food webs – a large scale and long term field experiment
It is a widely accepted assumption that fish predation controls structure and functioning of aquatic food webs. In the past, however, a large part of effort was concentrated on lakes and reservoirs. Thus, the knowledge about stream ecosystems is much more rudimentary than that for lakes in this …
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Trophic Interactions And The Efficacy Of Milfoil Weevils For Biocontrol Of Eurasian Watermilfoil In Wisconsin Lakes
… communities, serves as poor-quality habitat for fish and macroinvertebrates, impacts recreation, and can clog water supply infrastructure. The milfoil weevil (Euhrychiopsis lecontei Dietz) has been associated with EWM declines in several states, though natural weevil densities are generally too …
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Food Resource Utilization By Five Species Of Benthic Feeding Fish In Passamaquoddy Bay, New Brunswick
Feeding relationships of various fish species, and their relationship to the composition of the surrounding sediments, were observed for one year at two sites in the lower Bay of Fundy region. The fishes were the ocean pout (Macrozoarces americanus), winter flounder (Pseudopleuronectes americanus), …
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Benthic Population Distributions in Red Rock Reservoir, Iowa Summer 1972
… production and distribution. The influence of fish predation and sedimentation and the loss of production via reservoir flowthrough should be investigated.
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Interference in White Bass Reproduction by Two Introduced Predators in Barren River Lake, Kentucky
… bass. In the springs of 2012 and 2013 I sampled fish from within a five kilometer stretch of Barren River upstream of the lake. I collected 144 white bass, 111 yellow bass and 29 hybrid striped bass. Detection of species at spawning sites was staggered with yellow bass and hybrid striped bass …
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The role of aquatic macrophytes in the availability of food for young fish
… . Evidence from a second gravel-pit lake (lower fish stock) indicated that this was partly caused by fish predation pressure in the first lake (higher fish stock). No microcrustacea longer than 1mm occurred in the open water. The size range in the weedbeds was 0 .1 -2 .0mm. Diversity and …
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The Ecology of the Endangered Dusky Gopher Frog (Rana Sevosa) and a Common Congener, the Southern Leopard Frog (Rana Sphenocephala)
… sevosa has been extirpated. The introduction of fish to breeding ponds would also differentially affect the two species. R. sevosa did not display behavioral defenses to the threat of fish predation while R. sphenocephala did. R. sevosa displayed a preference for certain characteristics in its …
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The roles of predation, competition, and exploitation in the community dynamics of the New River in West Virginia
… trophic dynamics among key macroinvertebrate and fish populations in the New River, West Virginia, was developed to help define the roles of predation, competition, and fishery exploitation in the food web of this large, warmwater stream. The fates of production of the harvested crayfish …
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Impacts of the Invasive White Perch on the Fish Assemblage of Kerr Reservoir, Virginia
… with negative consequences to some resident fishes. White perch are ovivores and may prey upon as well as compete with juvenile sportfishes. Since 1988, an introduced population of white perch has proliferated in the 19,790-ha Kerr Reservoir, NC-VA, potentially threatening popular sport …
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Biodiversity and Biogeography of Amphipod Crustaceans
… This thesis also gives insight into the intense fish predation in the tropics that limiting amphipod abundance as one hypothesis for low amphipod species richness in the equator.
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A model of copepod population dynamics in the southern Benguela upwelling region
… feeding on patches of C. carinatus prey, and the fish's performance is quantified through temporal and spatial integration of periods and patches of prey abundance and shortage. Constant high fish densities dampen the spatial variability in copepod abundance, whereas a pulsed predation pressure …
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Ecosystem effects of a rock-lobster 'invasion': comparitive and modelling approaches
… on the benthic community and associated fisheries. To investigate these effects, I used both empirical and modelling approaches. Based on field studies, I first analysed temporal changes in rock lobsters and the benthic community at two lobster-invaded sites EOCH. Prior to 1990, rock …