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Showing 1 to 16 of 16 for “"grassland bird species"”.
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The Genetic Consequences of Fragmentation and Small Population Size in Two Grassland Bird Species: The Greater Rhea and the Greater Prairie Chicken
"In addition, genetic analysis of four extant populations of the greater prairie chicken and museum specimens from a prebottlenecked population along with ecological data on population fitness allowed me to directly assess the effects of a demographic bottleneck on the genetic diversity and fitness …
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Modeling Detection and Density Using Distance Sampling for Three Priority Grassland Bird Species in Texas - Northern Bobwhite (Colinus virginianus), Eastern Meadowlark (Sturnella magna), and Painted Bunting (Passerina ciris)
In Texas, three priority grassland species have experienced declines due to the loss of native grasslands. These species are the Northern Bobwhite (Colinus virginianus), Eastern Meadowlark (Sturnella magna), and Painted Bunting (Passerina ciris). Due to this, accurate density and abundance …
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Influence of Habitat Disturbances on Endemic Grassland Bird Distributions in Loamy Ecological Range Sites at Canadian Forces Base Suffield, Alberta
Many grassland birds are at risk and habitat disturbance may have an important influence on the persistence of these species. Military bases provide an opportunity to examine the influence of habitat disturbance on grassland birds, whose distributions are influenced by vegetation structure. Spatial …
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Going through the motions : the impacts of frequent fires and grazing pressure on reproduction of Montane grassland birds
… implicated as a 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 …
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Evaluation Of Selected Spectral Vegetation Indices In Senescent Rangeland Canopy Using Landsat Imagery
<p>Grassland birds are diminishing more steadily and rapidly than other North American birds in general. The nesting success of some grassland bird species depends on the amount of nonproductive vegetation (NPV). To estimate NPV land managers are currently using the Robel pole visual obstruction …
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A population study and management suggestions for the Denslow's Sparrow (Ammodramus henslowii) at Fort, Drum, NY
… henslowii) is one of the most threatened grassland bird species in North America. It is listed as endangered, threatened, or a species of concern in 30 of 32 states and one Canadian province in its historic range. This obligate grassland breeding bird species is now clustered in smaller …
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Nesting Success of Grassland Birds in Fragmented and Unfragmented Landscapes of North Central South Dakota
Decline of grassland bird species has frequently been linked to habitat loss and fragmentation. A large amount of remaining native prairie is in the form of grazed pastureland; however, few studies have focused on assessing pastureland as habitat. While studies have found that species occurrence, …
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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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Avian Nesting Densities and Success in Introduced Cool-Season Grass-Legume Plantings Versus Warm-Season Native Grass Planting in South Dakota 2002-2003
… Great Plains. As a result populations of many grassland bird species have declined. The Conservation Reserve Program (CRP) has restored more than 14 million hectares of prairie and idle grassland. Studies indicate that warm-season native grass plantings (WSN) generally provide good winter …
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Using Occupancy Models to Predict Grassland Bird Distributions in Southeastern Alberta
Widespread population declines of grassland birds have stimulated a variety of conservation plans, many of which promote a landscape approach to conservation. Identifying needs for survival and reproduction, and prioritizing key habitat requirements that influence where species occur on the …
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Land Cover Change and the Breeding Bird Survey: Rates of Change in Relation to Roads
… of Interior Fish and Wildlife Service’s Breeding Bird Survey. Reliability of the Breeding Bird Survey data has been criticized due to surveys being conducted along road-side transects. Based on BBS assumptions that land cover is the same adjacent to roads as it is away from roads the overall goal …
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Habitat use, population size, and nesting ecology of conservation priority bird species using restored fields in agricultural landscapes
… population declines of many early successional bird species have been linked with habitat loss due to agriculture. One conservation effort that attempts to mitigate these losses is through programs that restore habitat on private lands that were formerly used for row-crop agriculture (hereafter …
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Avian Occurrence in Woodlands and Grasslands on Public Areas Throughout Eastern South Dakota
… purpose of this study was to inventory nongame bird species on public lands throughout eastern South Dakota in woodland and grassland habitats of different patch sizes and landscape matrices in various physiographic regions. Nongame birds were surveyed in 524 (99 native and 425 planted) woodland …
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Population demography of lark buntings: post-fledging survival, fecundity, and breeding decisions
Grassland bird species have experienced the largest population declines of any terrestrial avian group in the past four decades in North America. Lark buntings (Calamospiza melanocorys), endemic to the grasslands of North America, have declined by 2.5% per year in Colorado and 2.1% per year in the …
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Towards adaptive management of high-altitude grasslands: Ingula as a case study
Eastern high - altitude grasslands of South Africa are centres for endemism and harbour fauna and flora of regional and international conservation concern. This area also provides important ecological services such as provision of water to communities downstream. Sweet and sour veld support beef …
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Effects of Management Practices on Grassland Plant and Bird Community Composition in Kane County Forest Preserves
<p>Loss of grassland ecosystems over the past century has increased importance of efforts to improve and restore habitat for native plant species and the biotic communities they support. As a result of these efforts, biotic and abiotic conditions and interactions with the environment are altered. …