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Keyword: abundance

Black‐backed woodpecker abundance in the Black Hills

Publications Posted on: December 06, 2018
The Black Hills population of black-backed woodpeckers (Picoides arcticus) was petitioned, but deemed not warranted, to be listed as a threatened or endangered species under the Endangered Species Act and more information on their population size in the region is needed. Our objective was to map abundance and provide a population estimate of black-backed woodpeckers in the Black Hills and Bear Lodge Mountains of South Dakota and Wyoming, USA.

Male greater sage-grouse detectability on leks

Publications Posted on: February 09, 2016
It is unlikely all male sage-grouse are detected during lek counts, which could complicate the use of lek counts as an index to population abundance. Understanding factors that influence detection probabilities will allow managers to more accurately estimate the number of males present on leks.

Estimating bighorn sheep (Ovis Canadensis) abundance using noninvasive sampling at a mineral lick within a national park wilderness area

Publications Posted on: October 07, 2015
Conservation of species requires accurate population estimates. We used genetic markers from feces to determine bighorn sheep abundance for a herd that was hypothesized to be declining and in need of population status monitoring.

Quantitative approaches for evaluating fire effects on wildlife communities in National Forest Systems

Projects Posted on: April 14, 2015
Innovative quantitative approaches have been developed for evaluating wildfire and prescribed fire effects on wildlife communities in several western North American national forests.

Detecting population recovery using gametic disequilibrium-based effective population size estimates

Publications Posted on: March 16, 2015
Recovering populations often must meet specific growth rate or abundance targets before their legal status can be changed from endangered or threatened. While the efficacy, power, and performance of population metrics to infer trends in declining populations has received considerable attention, how these same metrics perform when populations are increasing is less clear.

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.

Land-cover change and avian diversity in the conterminous United States

Publications Posted on: September 14, 2012
Changes in land use and land cover have affected and will continue to affect biological diversity worldwide. Yet, understanding the spatially extensive effects of land-cover change has been challenging because data that are consistent over space and time are lacking. We used the U.S.

Efficient species-level monitoring at the landscape scale

Publications Posted on: May 30, 2012
Monitoring the population trends of multiple animal species at a landscape scale is prohibitively expensive. However, advances in survey design, statistical methods, and the ability to estimate species presence on the basis of detectionnondetection data have greatly increased the feasibility of species-level monitoring.

Data on distribution and abundance: Monitoring for research and management [Chapter 6]

Publications Posted on: October 04, 2011
In the first chapter of this book we identified the interdependence of method, data and theory as an important influence on the progress of science. The first several chapters focused mostly on progress in theory, in the areas of integrating spatial and temporal complexity into ecological analysis, the emergence of landscape ecology and its transformation into a multi-scale gradient-based science.