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Keyword: nesting

How do wildfires and forest restoration efforts affect spotted owls?

Science Spotlights Posted on: February 06, 2018
High-severity wildfires are increasing and researchers are issuing different findings regarding wildfire impacts on spotted owls (Strix occidentalis), a threatened species that nests in mature, western forests with large trees and high canopy cover. Data from different studies show mixed responses of spotted owls to fire, but suggest that the effects of high-severity wildfires could be significant throughout the range of all three subspecies. The debate over owls, wildfire, and managed forest restoration needs further evaluation.

Food habits of nesting prairie falcons in Campbell County

Publications Posted on: June 15, 2016
Fifteen species of prey were utilized by nesting Prairie Falcons (Falco mexicanus) as determined through pellet analysis. Thirteen-lined Ground Squirrels (Spermophilus tridecemlineatus), the most common prey, were present in 91% of the pellets, followed by Western Meadowlarks (Sturnella neglecta) which were present in 56% of pellets.

Prairie falcons quit nesting in response to spring snowstorm

Publications Posted on: June 15, 2016
A small population of Prairie Falcons (Falco mexicanus) (mean = 6 pairs/year) nesting in northcentral Wyoming quit nesting in response to a severe spring snowstorm in 1984. Temperatures during the April storm were similar to years when the falcons reproduced successfully, but the monthly snowfall was 89.2 cm as compared to the 30-yr monthly average of 29.92 cm (90% CI = 21.44 -38.40 cm).

Changes in trumpeter swan (Cygnus buccinator) activities from winter to spring in the greater Yellowstone area

Publications Posted on: June 15, 2016
Trumpeter swans (Cygnus buccinator), in the winter, primarily, slept 42% of the time, fed 30%, swam 12%; and preened 7%. Comparisons of swan activities among die periods during the winter indicated they increased feeding throughout the day into night, when they fed at their highest rate. Swans spent more time sleeping as winter temperatures decreased; feeding mostly ceased when temperatures fell below approximately -17 C.

Food habits of Northern Goshawks nesting in south central Wyoming

Publications Posted on: March 25, 2016
Northern Goshawks (Accipiter gentiles) nesting in south central Wyoming consumed at least 33 species of prey; 14 were mammals and 19 were birds.

Data product containing nest site selection and survival data for "Nesting ecology of greater sage-grouse Centrocercus urophasianus at the eastern edge of their historic distribution"

Datasets Posted on: August 27, 2015
The greater sage-grouse (Centrocercus urophasianus) in North Dakota is listed as a Priority Level 1 Species of Special Concern by the the North Dakota Game and Fish Department due to the declining populations between 1965 and 2003. This data publication contains nest site selection and nest survival data for the greater sage-grouse in North Dakota between 2005 and 2006.

Breeding biology of Lucy's Warbler in southwestern New Mexico

Publications Posted on: August 18, 2010
We found Lucy's Warblers breeding abundantly in mid-elevation broadleaf riparian forests in the lower Gila River valley of southwestern New Mexico. They arrived en masse in the third week of March. Patterns of singing suggested that Lucy's Warblers might raise two broods. Few were heard or seen after late July. Estimated population densities ranged from 1.

Seasonal variation in nest placement of Abert's Towhees

Publications Posted on: July 15, 2010
Several meteorological variables are known to influence the heat budgets of nesting birds (e.g., Walsberg and King 1978a, b). Such factors include air temperature, incident radiation, wind, and humidity. If the microclimate of the nest is unfavorable, parent birds may become inattentive, exposing eggs or nestlings to excessive heat or cold. They may then desert the nest and their offspring may die.

Nesting ecology of greater sage-grouse Centrocercus urophasianus at the eastern edge of their historic distribution

Publications Posted on: December 07, 2009
Greater sage-grouse Centrocercus urophasianus populations in North Dakota declined approximately 67% between 1965 and 2003, and the species is listed as a Priority Level 1 Species of Special Concern by the North Dakota Game and Fish Department. The habitat and ecology of the species at the eastern edge of its historical range is largely unknown.

Nest observations of the long-eared owl (Asio otus) in Benton County, Oregon, with notes on their food habits

Publications Posted on: March 05, 2009
A nesting pair of long-eared owls was found 10 miles north of Corvallis, Benton County, Oregon, on 24 April, 1969. The pair was observed and photographed until 30 May, when the young left the nest. This is the third record of nesting Asio otus west of the Oregon Cascades. Gabrielson and Jewett (1940) reported that Pope collected eggs from a nest "presumably near Sheridan" in 1894.

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