Global ETD Search
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Showing 1 to 20 of 41 for “"juvenile survival"”.
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A Study of factors influencing a non-cyclic, island population of snowshoe hares
… densities, predation rates, reproduction and juvenile survival were all monitored on both Jacquot Island and mainland study areas. Habitat on the study sites was also examined for cover and browse availability. Jacquot Island juveniles had survival rates 3-15 fold higher than mainland …
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Tales of an 'invisible' life stage : survival and physiology among terrestrial juvenile Ambystomatid salamanders
The vital rates (e.g., survival, growth, and reproduction) of distinct life stages within a species are known to influence the growth and persistence of populations. As such, studies describing stage-specific vital rates, and the factors that shape variation in these rates across species and …
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Social Organization, Natal Dispersal, Survival, and Cause -Specific Mortality of Red Foxes in Agricultural and Urban Areas of East-Central Illinois
Survival was influenced the most by environmental and body condition. Adult foxes with low (0--20%) and high (80--100%) row-crop percentages, and higher capture weights experienced higher survival. Juveniles from larger litters, low capture body fat, and fewer dispersal days had higher survival. …
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Population Dynamics of Piping Plovers (Charadrius melodus) on the Missouri River
… to investigate the factors affecting adult and juvenile survival. We used a logistic-exposure model to calculate nest survival. Adult and juvenile survival was calculated using Cormack-Jolly-Seber based models in Program MARK. We used the estimates from these studies to create a matrix …
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Natal dispersal and first-year survival in a neotropical migratory songbird
Juvenile survival is among the most important demographic parameters driving population dynamics in birds. However, because first-year (i.e. 1-year-old) migratory passerines are thought to return to breed at great distances from their natal location, the factors that influence first-year survival …
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Effects of enhanced winter nutrition and climatic variation on population performance of a large herbivore
… involve prioritizing energy allocation to adult survival over any single reproductive event, therefore maximizing future reproductive potential. Therefore, a commonly observed energetic tradeoff in large mammals is between current and future reproduction rather than between reproduction and …
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Spatiotemporal Modeling for Wildlife Demographic Analysis: Bridging Analysis to Waterfowl Conservation
… demographic processes (e.g. reproduction, survival, growth, and dispersal) that govern populations and manage them in an increasingly altered world. Population dynamics often respond to environmental alterations, such as habitat fragmentation, climate variability, and resource changes, as …
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Habitat selection and survival of juvenile black-capped vireos during the post-fledging period
… has been overlooked. During this period, juvenile birds independent of parental care must find food to build up fat reserves for migration and simultaneously avoid predators. Many studies have reported low survival rates for juveniles as well as a shift in habitat selection during this …
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Population Dynamics of the Endangered Black-capped Vireo (Vireo atricapilla)
… tradeoffs between reproductive success and survival. Varying demography across the landscape can result in a metapopulation structure and the recognition of source-sink dynamics could have far-reaching implications for wildlife management, particularly of endangered species. The black-capped …
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Avian population and community dynamics in response to vegetation restoration on reclaimed mine lands in southwest Virginia
… however, empirical estimates of adult and juvenile survival are needed to provide better estimates of population status. For field sparrows, models of avian nest success support the hypothesis that a tradeoff exists between nest concealment and a view of the surroundings for field sparrows. …
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Population demography of lark buntings: post-fledging survival, fecundity, and breeding decisions
… influencing reproductive productivity and juvenile survival on the breeding grounds are among the possibilities. To assess population declines, direct and reliable estimates of survival, fecundity, and dispersal are required. Consequently, I estimated demographic parameters (i.e., …
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Life history traits and population processes in marine bivalve molluscs
… species. By incorporating information on growth, survival, and reproduction into matrix population models I could evaluate the relative contributions of these factors to fitness. For broadcast-spawners, long life is an important factor enabling them to gamble on rare, large recruitment events. …
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The breeding ecology of the Northern Wheatear (<i>Oenanthe oenanthe</i>) on Skokholm Island
… size, age structure, site fidelity and survival rates) can help determine drivers of species’ population change. The Northern Wheatear (Oenanthe oenanthe) is an insectivorous migrant songbird. Its breeding range is nearly circumpolar in the Northern Hemisphere extending across Eurasia, …
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Comparative Ecology of Juvenile Striped Bass and Juvenile Hybrid Striped Bass in Claytor Lake, Virginia
… physiological indices of health, overwinter survival, and post-stocking predation. Both fishes preferred habitat types characterized by structure-free sand or gravel substrates, but striped bass and hybrid striped bass did not exhibit significant diet overlap during the growing season. At a …
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Predicting Northern Goshawk Dynamics Using an Individual-based Spatial Model
… adults, proportion of the population made up of juveniles, and age structure of the adult population. Raster maps from 100 simulations were used to create probability surfaces predicting nest site, post-fledging area, and territory occurrences, although 10,000 or more simulations would produce …
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Predicting Northern Goshawk Dynamics Using an Individual-based Spatial Model
… adults, proportion of the population made up of juveniles, and age structure of the adult population. Raster maps from 100 simulations were used to create probability surfaces predicting nest site, post-fledging area, and territory occurrences, although 10,000 or more simulations would produce …
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The use of ringing data in the study of climatic influences on common passerines
… the influence of climatic variation on survival of 10 common passerines in southern Africa. Through sheer numbers common species are fundamental to ecosystem functioning. Migratory species are subject to climatic stochasticity in breeding and wintering grounds, and during migration. In a …
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Demography and ecology of a declining endemic: The Olympic marmot
… birth or death rates. Likewise, 100% overwinter survival of adults and normal reproductive and juvenile survival rates provide no support for the hypothesis that changes in forage quality or thermal conditions within hibernacula associated with low snowpack were causing the decline. In fact, …
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Demography and ecology of a declining endemic: The Olympic marmot
… birth or death rates. Likewise, 100% overwinter survival of adults and normal reproductive and juvenile survival rates provide no support for the hypothesis that changes in forage quality or thermal conditions within hibernacula associated with low snowpack were causing the decline. In fact, …
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Analyses of Greater Sage-Grouse (Centrocercus urophasianus) Translocation Release Methods and Chick Survival in Strawberry Valley, Utah
… research has indicated that low nest success and juvenile survival of Greater Sage-Grouse may be responsible for population declines. Recent technological advances in micro-transmitters have made radio-telemetry studies on Sage-Grouse chicks more common. Radio-telemetry enables monitoring of …
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