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Keyword: demography

100 years of vegetation change at the Sierra Ancha Experimental Forest

Projects Posted on: March 08, 2019
This project incorporates historical data collected at the Sierra Ancha Experimental Forest nearly 100 years ago to determine how plant communities have changed over that period of time.

Sprawling and diverse: The changing U.S. population and implications for public lands in the 21st Century

Publications Posted on: June 29, 2018
Public lands are typically established in recognition of their unique ecological value, yet both ecological and social values of public lands change over time, along with human distribution and land use. These transformations are evident even in developed countries with long histories of public land management, such as the United States.

Managing emerging threats to spotted owls

Publications Posted on: May 10, 2018
The 3 spotted owl (Strix occidentalis) subspecies in North America (i.e., northern spotted owl [S. o. caurina], California spotted owl [S. o. occidentalis], Mexican spotted owl [S. o. lucida]) have all experienced population declines over the past century due to habitat loss and fragmentation from logging.

Long-term demography of the Northern Goshawk in a variable environment

Publications Posted on: May 17, 2017
The Nearctic northern goshawk (Accipiter gentilis atricapillis) is a resident of conifer, broadleaf, and mixed forests from the boreal to the southwestern montane regions of North America.

Northern goshawks on the Kaibab Plateau: A 20-year investigation into factors affecting their demography

Science Spotlights Posted on: August 26, 2016
The elusive northern goshawk, its forest habitats, and the habitats of its bird and mammal prey are significant conservation issues related to the management of forests throughout the hawk’s North American range.  The Rocky Mountain Research Station has been enumerating the population size and documenting the population ecology and demography of individual goshawks on Arizona’s Kaibab Plateau for 20 years with the objective of identifying the vegetation composition and structure of forests habitats that best supports their survival and reproduction.

A longevity record for Canada lynx, Lynx canadensis, in western Montana

Publications Posted on: January 22, 2016
The Canada lynx (Lynx canadensis) was listed as a threatened species under the Endangered Species Act (USDI Fish and Wildlife Service 2000) in 2000 and is a species of conservation concern in the United States. New insights into the basic demography of southern lynx populations are needed.

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

Science Spotlights Posted on: May 20, 2015
RMRS scientists recently completed a 10 year study of a population of threatened Mexican spotted owls (Strix occidentalis lucida) in the Sacramento Mountains, New Mexico. This study evaluated demography, habitat use, and diet composition of spotted owls, as well as forest structure characteristic of owl habitat. We determined that most owl nests are located in wet mixed-conifer forests not greatly in need of ecological restoration.

Geographically variable response of Dendroctonus ponderosae to winter warming in the western United States

Publications Posted on: April 15, 2015
Milder winters have contributed to recent outbreaks of Dendroctonus ponderosae in Canada, but have not been evaluated as a factor permitting concurrent outbreaks across its large range (ca.1500 9 1500 km) in the western United States (US). We examined the trend in minimum air temperatures in D.

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.

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