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 “"juvenile recruitment"”.
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Ecology and Genetics of Blanding's Turtles in an Urban Landscape
… in the GCMA are small and isolated and have juvenile recruitment problems, though do not appear to be suffering genetically. As expected, Blanding's turtles relied extensively on wetlands, but during dry periods turtles were often found on land and in permanent residential ponds located on …
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Relationships between climate, growth and fisheries production in a commercially exploited marine fish
… rate was measured using otolith chronologies for juveniles (years 0-2) and adult (years 3-10). Lastly, annual catch data from the commercial fishery was compared to each climate and environmental variable to examine relationships between climate and fisheries production. Results indicate that …
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The Growth and Bioenergetics of <i>Callinectes sapidus</i> Larvae and the Effects of Diet Quality on Larval Physiology
… may correlate with success in development and juvenile recruitment.</p> <p>Larvae were exposed to two diets differing quantitatively in ω3 PUFA and respiration, excretion, growth, and feeding rates were measured for each larval stage and the megalopal stage. The energy partitioned to molts and …
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Factors influencing brook trout (Salvelinus fontinalis ) abundance in forested headwater streams with emphasis on fine sediment
… fine sediment was a principal determinant of juvenile trout abundance relative to other physical and biological factors. Adult trout abundance was principally a function of stream discharge, and is potentially further influenced by fine sediment impacts on juvenile recruitment. Spatially …
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From nesting to emergence: Environmental drivers of hatchling success in Blanding’s turtles and implications for management in Southeast Michigan
… whose populations are highly sensitive to juvenile recruitment. We used intensive nest monitoring, microclimate logging, soil measurements, and local weather data at two Southeast Michigan sites to quantify how nest placement, incubation environments, and substrate conditions influence …
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Historical Responses Of Marine Turtles To Global Climate Change And Juvenile Loggerhead Recruitment In Florida
… previously undocumented. I identify a pattern of juvenile recruitment to foraging grounds proximal to their natal nesting beach. This pattern results in a predictable recruitment pattern from juvenile foraging ground aggregations to local rookeries. This research will provide crucial information …
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Community ecology and population dynamics of the European native oyster (Ostrea edulis) in Essex, UK: A baseline for the management of the Blackwater, Crouch, Roach and Colne Estuaries Marine Conservation Zone
… strategies to increase adult oyster survival and juvenile recruitment recommended.
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Are local range expansions in southerly populations of Aloidendron dichotomum early indicators of a future range shift?
… is substantiated by the observed high levels of juvenile recruitment in these populations relative to others, and in time, is likely to lead to range expansion in the region.
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Comparative breeding biology of the Northern Rockhopper penguin Eudyptes moseleyi on Gough and Nightingale Islands
… and 40-day old chick mass 47% less(implying poor juvenile recruitment)compared to on Gough Island. Poor foraging conditions for birds on Nightingale Island is the most probable explanation for these results, and future studies should focus on the foraging locations used by birds on both islands. …
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Characterizing the Microbiome of Scottish Freshwater Pearl Mussels (Margaritifera margaritifera): A Metabarcoding Analysis using Next-Generation Sequencing
… in low reproductive success and limited juvenile recruitment. Addressing research gaps, particularly the understudied microbiome, may be crucial for effective conservation. With their filter-feeding lifestyle exposing them to diverse microbial communities, these mussels serve as an …
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Etude des facteurs écologiques et écotoxicologiques impliqués dans la réussite d’incubation chez la tortue luth, Dermochelys coriacea, de Guyane Française
… low hatching success and corresponding low juvenile recruitment could also result in long term declines of leatherbacks. On the Yalimapo beach, in French Guiana, hatching success is lower for this species than on other nesting sites, emphasising the problem of recruitment for the population. …
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Spatial modelling of blue whiting population dynamics in the north-east Atlantic
… strategies. Observations suggest that changes in recruitment and/or population distributions might be explained by environmental factors and spatial processes. However, it is unclear how these drivers directly affect the population, and how they might be used to predict future changes. Here I …
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The importance of female phenotype in determining reproductive potential and recruitment in Atlantic coast striped bass (Morone saxatilis)
… numbers of mothers contributing to juvenile recruitment. Specifically, this study evaluated whether the variance in the distribution of half-sibling families was greater than expected by random reproductive success (i.e., Poisson process). If true, it was expected that the effective …
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The Influence of Habitat Structure and Environmental Variability on Habitat Use By Fish in the Vermillion River, South Dakota
… but season, temporal changes in stream flow, and juvenile recruitment affect habitat utilization patterns. Protection of complex habitats and tributary streams is essential for the wellbeing of Vermillion River fishery resource.
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The Influence of Habitat Structure and Environmental Variability on Habitat Use by Fish in the Vermillion River, South Dakota
… but season, temporal changes in stream flow, and juvenile recruitment affect habitat utilization patterns. Protection of complex habitats and tributary streams is essential for the wellbeing of Vermillion River fishery resource.
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The Effect Of Supplemental Food On The Life History Traits And Demography Of A Population Of Peromyscus Mexicanus
… weaned twice as many offspring as unfed females. Juvenile survival was not influenced by food addition. Overall, 40% of the females and 26% of the males born on the study grids, were present on grids as adults. Weight and parity had little influence on reproductive patterns.;Population density did …
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A Quantitative Survey of the Freshwater Mussel Fauna in the Powell River of Virginia and Tennessee, and Life History Study of Two Endangered Species, Quadrula sparsa and Quadrula intermedia
… and 0.00 to 2.24 mussels/m2. Recent recruitment (individuals < 40 mm, depending on the species) was observed for 15 species, including the endangered Epioblasma brevidens, Lemiox rimosus, and Quadrula intermedia. The greatest number of species (6) with evidence of recent recruitment …
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STUDIES ON THE ECOLOGY OF HYALE NILSSONI (RATHKE) 1843, AN ALGAL-INHABITING AMPHIPOD CRUSTACEAN
… only one brood per female resulted in juveniles for H. nilssoni, while H. plumulosa had up to four broods per female. Timing of juvenile recruitment corresponded with increased water temperature. Hyale nilssoni reproduced in April, while H. plumulosa began reproduction in May. Juveniles …
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An integrative approach to testing density effects in a migratory songbird, the Prothonotary Warbler (Protonotaria citrea)
… is operating on this population. Evaluating juvenile recruitment and adult survival in relation to conspecific density would also be helpful. Finally, integrative work is needed to better understand how stress physiology and immunosuppression may mediate density effects in systems where …
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Effects of native forest and pastoral land use on the population dynamics and trophic role of the New Zealand freshwater crayfish Paranephrops planifrons (Parastacidae)
… native forest streams due primarily to greater juvenile recruitment. Crayfish populations in pastoral streams exhibited much greater growth than in native forest streams, but their longevity was shorter. Reproductive maturity occurred after 1 year in pasture streams, as opposed to 2 years in the …
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