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Showing 1 to 20 of 28 for “"breeding ecology"”.
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Breeding Ecology of the Field Sparrow (Spizella Pusilla)
Made available in DSpace on 2014-12-12T01:27:47Z (GMT). No. of bitstreams: 1 7511866.pdf: 5050699 bytes, checksum: acaebe29eebc3c7cd7cc4f6e31259864 (MD5) Previous issue date: 1974
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Observations on the breeding ecology of burrowing Owls in Saskatchewan
Observations regarding breeding biology of burrowing owls (Athene cunicularia) were collected on 98 breeding pairs during 1982 and 1983. Pairs of owls were first observed on the study area in late April with clutch initiation beginning in mid-May. Overall nest success averaged 59 percent with 2.6 …
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Status and breeding ecology of the loggerhead shrike in Virginia
… are still relatively widespread, Breeding Bird Survey results indicate that breeding population have declined substantially in Virginia and other parts of the species' range. Loggerhead shrikes should be considered for federal threatened status. I studied breeding chronology, …
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Heavy metal pollution and blackheaded gull (larus ridibundus L.) breeding ecology
Heavy metals in air, soil and water are a global problem and present a growing threat to the environment. These metals may have profound consequences for birds and can cause a number of sub-lethal effects, such as decreased reproductive success. The concentrations of selected heavy metals (As, Cd. …
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Spring Dispersal and Breeding Ecology of Northern Bobwhite in Southwest Ohio
… gap in knowledge of spring dispersal, breeding ecology and behavior, and breeding vital rates of Midwestern bobwhites near the northern limit of their range. It is unclear if recovery of Midwestern bobwhite populations is limited by spring dispersal capabilities and/or breeding vital …
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Avian breeding ecology in soybean fields: does no-till provide any benefits?
Approximately 71% of land cover in the Midwest is in agriculture production, with row crops being the most prevalent. Most row crops have replaced grasslands, resulting in declines of their constituent bird communities. Previous research has shown that tillage regimes can affect the suitability of …
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The breeding ecology of the Northern Wheatear (<i>Oenanthe oenanthe</i>) on Skokholm Island
… is an insectivorous migrant songbird. Its breeding range is nearly circumpolar in the Northern Hemisphere extending across Eurasia, the Middle East, through Siberia to Alaska and the Yukon, and west to Iceland, Greenland and eastern Canada. It covers a wide range of habitats, mountains, …
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Breeding Ecology and Productivity of Red-Necked Grebes in Turtle Mountain Provincial Park, Manitoba
<p>The breeding biology and productivity of the Red-necked Grebe (Podiceps grisegena) were studied in Turtle Mountain Provincial Park, Manitoba, during 1980 and 1981. Arrival dates ranged from mid-April to early June. Pre-nesting intervals ranged from 11 o 42 days and averaged about 20 days. …
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Breeding Ecology and Productivity of Mallards and Mallard-grey Duck Hybrids in New Zealand
… and Waikato) to answer essential questions about breeding season vital rates and habitat requirements, and to determine factors important in affecting population growth rates. Breeding incidence averaged 0.91 (SE = 0.03), renesting propensity following failure of nests or broods was 0.50 (SE = …
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Red-headed Woodpecker Habitat Selection and Breeding Ecology on Fort Drum Military Installation, New York
… red-headed woodpecker habitat selection and breeding ecology in the northeastern United States, I conducted a field study on Fort Drum Military Installation, New York where a small but regionally important population of 10--15 adult red-headed woodpecker pairs regularly breeds. From May to …
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The Breeding Ecology of Least Bitterns (Ixobrychus exilis) at Agassiz and Mingo National Wildlife Refuges
… The main objective was to study variation in the breeding ecology of least bitterns across a broad geographic area. Information gathered from nests included: nest success, egg and clutch measurements, hatchling developmental rates, and habitat measurements. Data suggest geographical variation in …
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Habitat selection and breeding ecology of grassland birds in areas managed with fire and grazing
Conversions of grasslands to row crop agriculture over recent decades have contributed to steep declines in grassland bird populations in the Midwest. On top of habitat loss, the cessation of historic disturbance regimes on remaining grasslands has served to homogenize vegetation structure. Because …
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The breeding ecology and behavioural adaptations of African black oystercatchers in light of climate change
… adaptations used by the species to cope with breeding in a limited strip of beach, between high tides and terrestrial predators, and with little nesting shelter, and their breeding decisions to maximise breeding outcomes. Behavioural and breeding data were collected over three breeding seasons …
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Aspects of the foraging and breeding ecology of the Southern African Kestrel, Falco tinnunculus rupicolus
A study of the ecology of the Southern African Kestrel was made in two areas of differing topography in the Eastern Cape Province (32 °S) of South Africa. The main objectives of the study were to describe foraging parameters (behaviour-time budgets, hunting success and diet) and breeding …
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IMPACTS OF BLOODBORNE PATHOGEN INFECTIONS ON BREEDING ECOLOGY AND SUCCESS IN WHITE-THROATED SPARROWS (Zonotrichia albicollis)
<p>Bloodborne pathogens have significant and persistent impacts on avian populations worldwide, including decreased long-term survival and population size. Existing research indicates that chronic pathogen infections may have negative impacts on nesting success, such as decreased numbers of …
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Breeding ecology and related life-history traits of the hoatzin, Opisthocomus hoazin, in a primary rainforest habitat
… which are used for climbing, and 4) co-operative breeding behaviour. Despite the information available on digestive mode and taxonomy little has been published on its breeding biology and behaviour and until now almost all knowledge was based on a study in the savannah of Venezuela. This is the …
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Land use and breeding ecology of a renosterveld endemic bird: the Agulhas Long-billed Lark Certhilauda brevirostris
… and abiotic variables, and to investigate the breeding ecology of this lark. To investigate the first question, I conducted 10–minute point counts at 51 sites regularly spaced in the core distribution of Agulhas Long-billed Lark. Points were spaced along small rural roads quarterly between …
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Wintering Reddish Egret (Egretta Rufescens) Foraging Response To Environmental Variability On The Southern Texas Gulf Coast
… rise due to climate change. While Reddish Egret breeding ecology has been well studied, little information is known about the wintering ecology of the species. With the goal of gaining more knowledge of its winter foraging habitat requirements, I conducted line transect surveys via boat of …
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Ecology and distribution of the Florida bog frog and flatwoods salamander on Eglin Air Force Base
I studied the ecology and distribution of the Florida bog frog (Rana okaloosae) and flatwoods salamander (Ambystoma cingulatum) on Eglin Air Force Base in northwest Florida. I report data on the breeding ecology, population dynamics, home ranges, microhabitat, and distribution of the endemic bog …
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Demography of a declining Dunlin (<i>Calidris alpina arcticola</i>): influences on adult survival and mate fidelity of an Arctic-breeding migratory shorebird
… (<i>Calidris alpina arcticola</i>), an Arctic-breeding shorebird. Prior adult survival estimates (0.41– 0.60) appeared insufficient to maintain a stationary population, however, it was unclear if estimates were reflective of bias or a real survival signal. Additionally, C. a. arcticola mate …
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