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Keyword: survival

Demography of Mexican spotted owls in the Sacramento Mountains, New Mexico

Publications Posted on: January 26, 2014
Information on population dynamics is key to gauging the status of threatened or endangered species. We monitored demography of a population of threatened Mexican spotted owls (Strix occidentalis lucida) in the Sacramento Mountains, New Mexico from 2003 to 2011.

Estimating abundance and survival in the endangered Point Arena Mountain beaver using noninvasive genetic methods

Publications Posted on: June 27, 2013
The Point Arena mountain beaver (Aplodontia rufa nigra) is federally listed as an endangered subspecies that is restricted to a small geographic range in coastal Mendocino County, California. Management of this imperiled taxon requires accurate information on its demography and vital rates.

Developing a stand hazard index for oak decline in upland Oak forests of the Ozark Highlands, Missouri

Publications Posted on: November 30, 2010
Black oak (Quercus velutina Lam.) and scarlet oak (Quercus coccinea Muenchh.)--two major components (44% of total stand basal area) of upland oak forests--are suffering severe decline and mortality in the Ozark Highlands, Missouri. However, factors influencing their survival (mortality) are not well understood.

Assessment of fire-damaged mesquite trees 8 years following an illegal burn

Publications Posted on: August 24, 2010
Effects of an illegal burn on the Santa Rita Experimental Range on mesquite (Prosopis velutina) survival in the semidesert grass-shrub ecosystem was initially assessed in terms of firedamage classes 18 months after the fire and again 8 years after the burn. While many of the mesquite trees on the burned site were damaged by the fire, some of the trees appear to have recovered to preburn conditions.

Severely insect-damaged forest: A temporary trap for red squirrels?

Publications Posted on: November 16, 2009
Recent insect infestations in the spruce-fir forest in the Pinalenno Mountains of southeastern Arizona provided an opportunity to document response to severe forest disturbance and existence of an ecological trap for an endemic montane isolate, the endangered Mt. Graham red squirrel (Tamiasciurus hudsonicus grahamensis).

Optimal seeding depth of five forb species from the Great Basin

Publications Posted on: September 25, 2009
Use of forbs in revegetation projects in the Great Basin is limited due to high seed cost and insufficient understanding of their germination and establishment requirements. We tested the effects of seeding depth from 0 to 25.4 mm (1 in) on emergence and survival in clay and sandy loam soils of 5 ecologically important forbs. Significantly less emergence occurred of gooseberry-leaf globemallow (Sphaeralcea grossulariifolia (Hook. &.

Wolf survival and population trend using non-invasive capture-recapture techniques in the Western Alps

Publications Posted on: September 21, 2009
Population abundance and related parameters need to be assessed to implement effective wildlife management. These essential parameters are often very hard to obtain for rare, wide-ranging and elusive species, particularly those listed as endangered or threatened (IUCN 2001).

Merriam's turkey poult survival in the Black Hills, South Dakota

Publications Posted on: August 12, 2009
We investigated poult survival from hatching to 4 wks of age for Merriam's wild turkey (Meleagris gallopavo merriami) poults in the southern Black Hills, South Dakota. We estimated survival from 841 poults reared by 57 radio-marked wild turkeys (n = 52 adult females, n = 5 yearling females). Survival of poults to 4 wks posthatch averaged 33 percent with 54 percent of the mortality occurring in the first 7 days after hatching.

Cerulean warbler reproduction, survival, and models of population decline

Publications Posted on: September 15, 2008
We present and compare demographic data for cerulean warblers (Dendroica cerulea) from 5 study sites across the range of the species from 1992 to 2006. We conducted field studies to collect data on daily nest survival, nest success, and young fledged per successful nest, and we used data to estimate fecundity. Daily nest survival, nest success, young fledged, and fecundity varied widely across the cerulean range and among years.

Mitigating exotic impacts: restoring native deer mouse populations elevated by an exotic food subsidy

Publications Posted on: September 02, 2008
The threat posed by exotic organisms to native systems has led to extensive research on exotic invaders, yet management of invasives has progressed relatively slowly. This is partly due to poor understanding of how exotic species management influences native organisms.