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.
Results
Showing 1 to 20 of 27 for “"declining populations"”.
-
Spatial and temporal genetic variation in small and declining populations of Atlantic salmon
… under national and European legislation but most populations are declining. The research investigated population size, habitat quality, population structure and stability over time using Atlantic salmon parr in the River Frome (a chalk stream in Dorset, England) surveyed at 15 sites, in summer and …
-
SAGE-GROUSE AND THE HUMAN FOOTPRINT: IMPLICATIONS FOR CONSERVATION OF SMALL AND DECLINING POPULATIONS
… of processes and scales that limit wildlife populations. We assessed landscape-level processes influencing sage-grouse (Centrocercus urophasianus), to a migratory population in the Milk River Basin (MRB), northeast Montana, USA, and south-central Saskatchewan, Canada. A regional analysis of …
-
SAGE-GROUSE AND THE HUMAN FOOTPRINT: IMPLICATIONS FOR CONSERVATION OF SMALL AND DECLINING POPULATIONS
… of processes and scales that limit wildlife populations. We assessed landscape-level processes influencing sage-grouse (Centrocercus urophasianus), to a migratory population in the Milk River Basin (MRB), northeast Montana, USA, and south-central Saskatchewan, Canada. A regional analysis of …
-
From Servitude to Freedom: Gender, Labor, and Domestic Relations
… enslaved people endured high mortality rates and declining populations at the height of the harsh slave regime in the mid-twentieth century. This resulted from regional disease, brutal working conditions, and a skewed sex ratio where enslaved men consistently outnumbered enslaved women. Following …
-
A population study and management suggestions for the Denslow's Sparrow (Ammodramus henslowii) at Fort, Drum, NY
… at the Ft. Drum military installation. The declining populations in the Northeast are likely due to breeding and wintering habitat loss, primarily resulting from changing agricultural practices and land use over time. Henslow' s Sparrow breeding behaviors and narrow habitat preferences make …
-
Breeding Biology of Wilson's Plovers (Charadrius Wilsonia): Reproductive Success, Habitat Use, and Sex Roles
… is vital information needed for management of declining populations. Wilson’s Plover, a species of concern in most of the southeastern United States, has low hatching success on Cumberland Island National Seashore, a largely undeveloped island. However fledging success is high and an estimate …
-
Status and breeding ecology of the loggerhead shrike in Virginia
… habitat use should be conducted in stable and declining populations.
-
Sub-lethal and lethal effects of a neonicotinoid pesticide on the development of Northern leopard frog tadpoles.
<p>Well-known global declines in amphibian populations have sparked decades of studies into potential causes (Stuart et al. 2004). Pesticides are a suspected contributor to declining populations (Bruhl et al. 2013). Imidacloprid is the most widely used insecticide in the world, but few studies have …
-
Relationships Between Winter Energetic Condition and Reproductive Investment in a Wild Bird
… at the mechanistic level. Using wild populations of black-capped chickadees (Poecile atricapillus), we evaluated whether traits relating to energetic condition (i.e., circulating corticosterone concentrations, oxidative balance, haemolytic complement activity, and body condition) …
-
Examining the impact of residential segregation on rapid transit development in Chicago's South Side
… Nearby Woodlawn and Englewood have experienced declining populations, lower densities, lower property values, and increased vacancies that border Hyde Park, creating clear spatial lines of uneven development. Englewood and Woodlawn have one asset that Hyde Park does not: two public transit rail …
-
Habitat Selection by Yellow -Headed Blackbirds
… This research was conducted in two declining populations in northeastern Illinois. I found that at the largest spatial scale, immigrants appear not to settle in the Illinois populations, probably because of their location on the periphery of the species' range. However, once in the …
-
A mathematical analysis of evolutionary rescue and niche construction
… experiments and field studies have shown that declining populations can avoid extinction by undergoing adaptation. This process, evolutionary rescue, entails a population approaching extinction until an adaptive mutation appears and subsequently establishes by escaping stochastic loss. While …
-
Effects of the aquatic to terrestrial habitat ratio on an amphibian predator and its prey
… sites of varying qualities. Studies of declining populations of amphibians typically focus on aquatic habitat and factors that affect larval survivorship and growth therein. However, this dissertation highlights the importance of both the aquatic and terrestrial habitats, and the ratio …
-
The platypus : historical, ecological, and behavioural advances to improve the conservation of an elusive species
… 3 I examined population dynamics, finding populations downstream of dams with significantly altered flow regimes had lower abundances and densities of platypuses than above dams, while the opposite was true for rivers where flow regimes had been improved. In Chapter 4, movement tracking …
-
Influences of social and habitat features on selection and use of breeding habitat and pup survival in South American fur seals
… for understanding the prospects for recovery of declining populations like those of South American fur seals (Arctocephalus australis) in Peru. In this study I examined the influences of habitat features and human disturbance on selection of breeding habitat by female fur seals in Peru; and I …
-
Propagation and monitoring of freshwater mussels released into the Clinch and Powell rivers, Virginia and Tennessee
… mussels for release to natal rivers to augment declining populations. In this study, I conducted laboratory experiments, assessed site suitability for mussel restoration, and evaluated survival and growth rates of released mussels to meet the requirements of recovery plan. I conducted multiple …
-
Determining Hydraulic Characteristics in Close Proximity of Hymenocallis coronaria within the Flint River Basin, Georgia
… macrophyte found in fragmented and limited populations in Southern rivers. Populations are located along the fall line of the southern states of Alabama, Georgia, and South Carolina. In these states, the geomorphology of riverbeds provides a shallow and swift-moving environment. …
-
Preserving Biodiversity for a Climate Change Future: A Resilience Assessment of Three Bay Area Species--Adenostoma fasciculatum (Chamise), Arctostaphylos canescens (Hoary Manzanita), and Arctostaphylos virgata (Marin Manzanita)
… –<em></em>A rare, endemic shrub species with declining populations </p> <p>3. Hoary Manzanita (<em>Arctostaphylos canescens)</em> – A species with paleo-ecological records traced to northern, cooler regions</p> <p>Of these chosen species <em>Adenostoma fasciculatum </em>was determined to be …
-
Cycad forensics: tracing the origin of poached cycads using stable isotapes, trace element concentrations and radiocarbon dating techniques
In South Africa, the greatest threat to cycad populations is the illegal removal of wild plants for landscaping purposes and collector's gardens, resulting in declining populations that are already threatened with extinction. Radiocarbon dating in conjunction with stable isotopes and trace element …
-
An environmental history of the Cederberg : changing climate, land use and vegetation patterns
… are most clearly observed, and best explain the declining populations of the endemic Clanwilliam cedar tree (Widdringfonia cedarbergensis). Evidence from 15 repeat photographs shows that there has been a rapid decline (average of 2.5% per annum) over the last 70 years, and if current rates of …
Page 1 of 2