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Showing 1 to 12 of 12 for “"bird population"”.

  1. Modelling mitigation of bird population declines in the UK through landscape-scale environmental management.

    Barnes, AilidhBournemouth University2021

    … a global scale despite efforts to the contrary. Birds are effective indicators of ecosystem health, occurring in almost every habitat on Earth. However, many UK birds have declined since the 1960s, and are now classified as endangered or rare. Knowledge of factors influencing the presence and …

    bournemouth Repository record

  2. The Bird Population of an Elm-Maple Forest with Special Reference to Food, Territory, and Seasonal Variations

    Twomey, Arthur CorneliusUniversity of Illinois at Urbana-Champaign1937

    uiuc Repository record

  3. Breeding bird populations in relation to the vegetation structure of abandoned contour mines in Southwest Virginia

    Chapman, David L.Virginia Polytechnic Institute and State University1977

    … to investigate relationships between breeding bird population parameters and structural aspects of the disturbed area vegetation. The territorial mapping method was employed to census bird populations. The number of breeding species, number of breeding pairs, bird species diversity, and number …

    vt Repository record

  4. Avian population densities, habitat use, and foraging ecology in thinned and unthinned hardwood forests in Southwestern Virginia

    Garrison, Barrett A.Virginia Polytechnic Institute and State University1986

    I examined impacts of thinning on bird population densities and habitat use in Appalachian mixed-hardwood forests during 1984 and 1985 at three thinned and three unthinned stands in the Jefferson National Forest, southwestern Virginia. Densities of shrubs, saplings, trees, and snags, canopy and …

    vt Repository record

  5. Bird Utilization of Woodland Habitat in the Eastern Quarter of South Dakota

    Emmerich, John M.

    Bird utilization of narrow, riparian woodland; riparian; block-like, tree claim; and linear, single-row windbreak habitats in the eastern quarter of South Dakota were studied during the spring migration, reproductive, and winter seasons. The relative importance of these three habitats and multi-row …

    sdstate Repository record

  6. Factors contributing to AMR occurrence in infectious agents of broiler chickens in selected districts in Zambia.

    Mirisho, RobertThe University of Zambia2022

    … Choma, Chilanga and Kafue districts. Thestudy population included small, medium and commercial scale broiler farmers. Both probability and non-probability sampling techniques were employed and structured questionnaires were administered for collecting the information about the risk factors of …

    zambia Repository record

  7. The Impacts of Corvids on Biodiversity

    Madden, Christine MFitzPatrick Institute of African Ornithology2013

    … The vast majority of studies were on impacts on birds, and of these passerines were the most frequently studied, followed by waders. Collating the results from both experimental and correlative studies revealed a negative impact for 29% (n=50) of cases, whereas no impact was detected in 63% …

    cape-town Repository record

  8. Nontarget Avian Use of DRC-1339 Treated Plots During An Experimental Blackbird Control Program in Eastern South Dakota

    Smith, Jason A.

    … Service has implemented an experimental blackbird control program using the avicide DRC-1339 to reduce the population of depredating blackbirds (red-winged blackbirds [Agelaius phoeniceus], yellow-headed blackbirds [Xanthocephalus xanthocephalus], and common grackles [Quiscalus quiscula]) in …

    sdstate Repository record

  9. Land Cover Change and the Breeding Bird Survey: Rates of Change in Relation to Roads

    Hanan, Michael D.

    … management decisions are often based on population estimates derived from counts at sample sites by estimating the proportion of animals counted on them. One widely used methodology for sampling avian populations across North America is the United States Department of Interior Fish and …

    sdstate Repository record

  10. Going through the motions : the impacts of frequent fires and grazing pressure on reproduction of Montane grassland birds

    Muchai, Samuel MuchanePercy FitzPatrick Institute of African Ornithology2002

    … cause for the decline of many grassland-nesting birds across the globe. While this effect has motivated extensive research and conservation in the developed northern hemisphere, it remains poorly addressed in southern hemisphere. Between 1998 and 2001 I examined the effect of fire frequency and …

    cape-town Repository record

  11. Density and Diversity Responses of Summer Bird Populations to the Structure of Aspen and Spruce-Fir Communities on the Wasatch Plateau, Utah

    Young, Janet Lee

    utahstate Repository record

  12. Phenology and frugivory of large-fruited species in northern New Zealand and the impacts of introduced mammals

    Dijkgraaf, Astrid CoraResearchSpace@Auckland2002

    … The effects of mammal pests on kereru, other bird species and some insect species were also investigated. Showing that phenological patterns have statistically significant character displacement has proved difficult in the past. It was considered that significant differences might be obtained …

    auckland-ms Repository record