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 ecology"”.
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Fish scales as ecological indicators: empirical approaches to improve their practical application to fish ecology
The collection of scales is common when fish communities are sampled within research and monitoring programmes in freshwater fisheries. Although used primarily to age individual fish, there is increasing evidence of their potential for application to other ecological methods, yet there is also …
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The Swift Water Place: Water Quality, Fish Ecology, and Hydropower in the Merrimack River since the Time of Thoreau
… in 1847 spelled the end of the anadromous fish runs that had populated the Merrimack for centuries. Salmon restoration proceeded for three decades after the Civil War until fish passage failed. Later, water filtration plants allowed communities to draw clean water from the Merrimack, …
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The influence of hydraulics, hydrology and temperature on the distribution, habitat use and recruitment of threatened cyprinids in a Western Cape river, South Africa
… explore the relationships between river flow and fish ecology in the context of the riverscape model of river ecosystems by examining the seasonal distribution of two endangered fish species, i.e. the Clanwilliam yellowfish and Clanwilliam sawfin, in relation to their physical (structural) and …
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Biotic Integrity and Northern Pike Ecology in Eastern South Dakota
… agricultural production. Understanding sport fish ecology in prairie streams, garners important public support for protecting stream biotic integrity. Thus, our objectives were to (1) develop a fish IBI and validate reference sites, and (2) quantify the age, growth, and diet of the important …
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Ecology, Growth, and Migration of Pseudoplatystoma fasciatum in the Amazon Basin
Freshwater fishes include diverse lineages collectively summing to over 18,000 species, representing ~51% of all fishes and ~25% of all vertebrates. About one-third of all freshwater species occur in the Neotropics, with an estimated 4,475 species within 71 families. Catfishes of the Order …
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Fish community response to reservoir habitat enhancement across multiple spatio-temporal scales
Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2023-04-12 without embargo terms
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Effects of habitat characteristics on cryptic fish assemblages
… structure is known to influence the abundance of fishes on temperate reefs. Biotic interactions play a major role in determining the distribution and abundance of species. The significance of these forces in affecting the abundance of fishes may hinge on the presence of organisms that either …
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A mechanistic framework for understanding prairie stream fish distributions
A fundamental goal of ecology is to understand environmental associations of species. These associations can provide a basis for predicting spatial distributions in contemporary habitats as well as how those distributions might change in response to anthropogenic environmental change. Developing …
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Factors influencing the nursery dynamics of juvenile bull sharks in two estuaries along the Texas coast
Nursery habitats provide refuge for juvenile organisms to grow and develop, and are utilized by several shark species, including bull sharks (Carcharhinus leucas). Bull sharks utilize estuaries adjoining the Gulf of Mexico as nursery habitat, and are the most abundant shark species found along the …
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Detection probabilities and local population demographics of fishes in urbanized and forested streams of the New River basin, Virginia
… in the detection probabilities of stream fishes, and used estimates of size/age-specific detection probabilities to reduce bias in estimates of the reproductive success of various fish species in urban and forested stream habitats. In Chapter 1, I examined differences in detection …
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Comparisons of habitat use and diet of herbivorous kyphosids (Genus Kyphosus) in tropical and temperate reefs
… a well-represented group of mainly herbivorous fishes distributed worldwide. Species within the genus Kyphosus are commonly found in both tropical and temperate areas, with Western Australia having especially high Kyphosus diversity and abundance compared to other regions. Despite being common …
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An Approach For Use of Dual Frequency Identification Sonar (DIDSON) to Quantify Behavioral Aspects of Piscivory at Ecologically Relevant Time and Space Scales
<p>Predator-prey interactions of large vagile fishes are difficult to study in the ocean due to limitations in the space and time requirements for observations. Small-scale direct underwater observations by divers (<10m >radius) and large-scale hydroacoustic surveys (10s - 100s km2) are traditional …
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The ecology of two estuarine-dependent tonguefishes, the blackcheek tonguefish (Symphurus plagiusa) and the offshore tonguefish (S. civitatium), in coastal Louisiana
… to influence the distribution and abundance of fishes and macroinvertebrates that utilize inshore estuarine habitat as nurseries during their early life histories. Current management plans designed to stabilize marsh elevations, such as freshwater diversions, may also influence the distribution …
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Effects of stream network topology on fish assemblage structure and bioassessment sensitivity in the mid-Atlantic highlands, USA
Stream fish assemblages exist within stream networks defined by the size and proximity of connected streams (i.e., stream network topology). The spatial position of sites within stream networks may therefore regulate opportunities for fish dispersal to access distant resources or colonize "new" …
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Dominanzverhältnisse, Interaktionen und räumliche Verteilung von Barsch, Plötze und Seeforelle in der mesotrophen Talsperre Saidenbach
Im Rahmen der vorliegenden Arbeit wurden die in der mesotrophen Talsperre Saidenbach bedeutendsten Fischarten (Plötze, Barsch, Seeforelle) bezüglich ihrer Populationsstruktur, der Nahrung und der Habitatnutzung untersucht. Ziel war einerseits, die Analyse der Ausgangssituation und der …