| susceptibility and antibody response of vesper sparrows (pooecetes gramineus) to west nile virus: a potential amplification host in sagebrush-grassland habitat. | west nile virus (wnv) spread to the us western plains states in 2003, when a significant mortality event attributed to wnv occurred in greater sage-grouse ( centrocercus urophasianus ). the role of avian species inhabiting sagebrush in the amplification of wnv in arid and semiarid regions of the north america is unknown. we conducted an experimental wnv challenge study in vesper sparrows ( pooecetes gramineus ), a species common to sagebrush and grassland habitats found throughout much of north ... | 2016 | 26981692 |
| a phylogenetic analysis of the emberizid sparrows based on three mitochondrial genes. | previous molecular phylogenetic studies have examined the taxonomic relationships among a number of typical emberizid sparrow genera. to help clarify these relationships, we sequenced a 1673 base pair fragment for the complete sequence of three mitochondrial genes: adenosine triphosphatase (atp8 and atp6) and cytochrome oxidase subunit iii (coiii) for 38 sparrow species, along with passerina amoena (cardinalidae) and piranga ludoviciana (thraupidae) which were selected as the outgroups. our anal ... | 2003 | 12967606 |
| associations of grassland bird communities with black-tailed prairie dogs in the north american great plains. | colonial burrowing herbivores can modify vegetation structure, create belowground refugia, and generate landscape heterogeneity, thereby affecting the distribution and abundance of associated species. black-tailed prairie dogs (cynomys ludovicianus) are such a species, and they may strongly affect the abundance and composition of grassland bird communities. we examined how prairie dog colonies in the north american great plains affect bird species and community composition. areas occupied by pra ... | 2013 | 23330695 |
| effects of granular formulations of terbufos and fonofos applied to cornfields on mortality and reproductive success of songbirds. | : this field study used a precise method of assessing effects of insecticides on bird populations by establishing a marked population before application and determining survival rates of known individuals after application of the insecticides. we investigated the effects of two organophosphate granular insecticides applied to cornfields in southwestern ontario to combat the corn rootworm (diabrotica spp.). nine control fields and 11 treated fields, six of which were treated with fonofos (dyfonat ... | 1995 | 24197620 |
| impacts of a severe drought on grassland birds in western north dakota. | we studied the effect of a severe drought on the population dynamics and community structure of grassland birds in western north dakota. during the spring and summer of 1988 the northern great plains suffered one of the warmest, driest periods in its recorded history. we compared the changes in bird populations and nesting productivity over a 3-yr period before, during, and after the drought. total grassland bird density declined 61% (p < .05) between june 1987 and june 1988. densities of six of ... | 1992 | 27759255 |
| the renal medulla and water economy in vesper sparrows (pooecetes gramineus). | | 1973 | 4145776 |
| songbird response to rest-rotation and season-long cattle grazing in a grassland sagebrush ecosystem. | grazing on natural rangelands, which are areas dominated by native vegetation that are used for livestock grazing, can achieve desired vegetation outcomes, preserve native habitat, and economically benefit multiple stakeholders. it is a powerful tool that can be manipulated to reduce wildlife declines and benefit ecosystems. however, the benefits of conservation grazing systems on many wildlife communities remain relatively unexplored. we compared songbird communities between two grazing systems ... | 2017 | 28946000 |