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Population estimation with sparse data: The role of estimators versus indices revisited

The use of indices to evaluate small-mammal populations has been heavily criticized, yet a review of small-mammal studies published from 1996 through 2000 indicated that indices are still the primary methods employed for measuring populations. The literature review also found that 98% of the samples collected in these studies were too small for reliable...

https://www.fs.usda.gov/treesearch/search?keywords=%22estimation%22&%3Bamp%3Bf%5B0%5D=author_facet%3A%22Calkin%2C%20Dave%22&%3Bf%5B0%5D=author_facet%3A%22Mueller%2C%20Brendt%22&f%5B0%5D=author_facet%3A%22McCollum%2C%20Deanne%22&f%5B1%5D=author_facet%3A%22Lynch%2C%20Ann%22&f%5B2%5D=author_facet%3A%22Chavez%2C%20Quinn%22&f%5B3%5D=author_facet%3A%22McKelvey%2C%20Kevin%22&f%5B4%5D=author_facet%3A%22North%2C%20Malcolm%22&f%5B5%5D=author_facet%3A%22Crow%2C%20Tom%22

Author(s):

Kevin S. McKelvey; Dean E. Pearson

Year:

2001

Keywords:

population estimation, data, indices, estimators, small mammals

Source:

Canadian Journal of Zoology. 79(10): 1754-1765.

Evaluating a new method for reconstructing forest conditions from General Land Office survey records

Historical forest conditions are often used to inform contemporary management goals because historical forests are considered to be resilient to ecological disturbances. The General Land Office (GLO) surveys of the late 19th and early 20th centuries provide regionally quasi-contiguous data sets of historical forests across much of the Western United States....

Author(s):

Carrie R. Levine; Charles V. Cogbill; Brandon M. Collins; Andrew J. Larson; James A. Lutz; Malcolm P. North; Christina M. Restaino; Hugh D. Safford; Scott L. Stephens; John J. Battles

Year:

2017

Keywords:

California, density, forest, plotless density estimator, Voronoi area

Source:

Ecological Applications. 27(5): 1498-1513

Estimation of effective population size in continuously distributed populations: There goes the neighborhood

Use of genetic methods to estimate effective population size (Ne) is rapidly increasing, but all approaches make simplifying assumptions unlikely to be met in real populations. In particular, all assume a single, unstructured population, and none has been evaluated for use with continuously distributed species. We simulated continuous populations with local mating...

Author(s):

M. C. Neel; K. McKelvey; N. Ryman; M. W. Lloyd; R. Short Bull; F. W. Allendorf; M. K. Schwartz; R. S. Waples

Year:

2013

Keywords:

genetic monitoring, inbreeding, isolation-by-distance, linkage disequilibrium, wahlund effect, wright's neighborhood

Source:

Heredity. doi:10.1038/hdy.2013.37.

Estimating historical forest density from land‐survey data: a response to Baker and Williams (2018)

Researchers throughout the US have used the General Land Office (GLO) surveys of the late 19th and early 20th centuries to estimate historical forest conditions. These surveys were conducted throughout the US and represent a systematic, historical sample of trees across a broad geographic area. The challenge of using GLO survey data is the accurate estimation of...

Author(s):

Carrie R. Levine; Charles V Cogbill; Brandon M. Collins; Andrew J. Larson; James A. Lutz; Malcolm P. North; Christina M. Restaino; Hugh D. Safford; Scott L. Stephens; John J. Battles

Year:

2019

Keywords:

Forest, California, density, plotless density estimator, Voronoi-area

Source:

Ecological Applications

Estimating riparian area extent and land use in the Midwest.

This report quantifies the amount and land use/land cover of riparian area in the seven-State Midwest Region of the continental United States. We estimate that riparian areas cover 8.9 to 13.2 million hectares in the region and that approximately 72 percent of riparian areas support natural or semi-natural land cover.

Author(s):

Brian J. Palik; Swee May Tang; Quinn. Chavez

Year:

2004

Keywords:

Riparian area, Midwest, riparian buffers, land use, land cover.

Source:

Gen. Tech. Rep. NC-248. St. Paul, MN: U.S. Department of Agriculture, Forest Service, North Central Research Station. 28 p.

DNA markers for identifying individual snowshoe hares using field-collected pellets

Snowshoe hare (Lepus americanus) abundance has been of interest to wildlife biologists, as hares are essential prey items for many rare and endangered predators. Snowshoe hare abundance has most commonly been estimated through indices such as pellet counts. While pellet counts may be useful in the areas they are developed and when hares are dense,...

Author(s):

Michael K. Schwartz; Kristine L. Pilgrim; Kevin S. McKelvey; Pilar T. Rivera; Leonard F. Ruggiero

Year:

2007

Keywords:

snowshoe hare, Lepus americanus, DNA markers, pellet counts, capture-mark-recapture, CMR

Source:

Northwest Science. 81(4): 316-322.

Estimating individual tree mid- and understory rank-size distributions from airborne laser scanning in semi-arid forests

Limitations inherent to airborne laser scanning (ALS) technology and the complex sorting and packing relationships of forests complicate accurate remote sensing of mid- and understory trees, especially in denser forest stands. Self-similarities in rank-sized individual tree distributions (ITD), e.g. bole diameter or height, are a well-understood property of natural,...

Author(s):

Tyson L. Swetnam; Donald A. Falk; Ann M. Lynch; Stephen R. Yool

Year:

2014

Keywords:

ALS, allometry, scaling, tapered Pareto distribution, understory, local maximum

Source:

Forest Ecology and Management. 330: 271-282.

Estimating abundance of mountain lions from unstructured spatial sampling

Mountain lions (Puma concolor) are often difficult to monitor because of their low capture probabilities, extensive movements, and large territories. Methods for estimating the abundance of this species are needed to assess population status, determine harvest levels, evaluate the impacts of management actions on populations, and derive conservation and management...

Author(s):

Robin E. Russell; J. Andrew Royle; Richard Desimone; Michael K. Schwartz; Victoria L. Edwards; Kristy P. Pilgrim; Kevin S. McKelvey

Year:

2012

Keywords:

Bayesian analysis, cougars, genetic sampling, Montana, Puma concolor, snow tracking, spatial capture-recapture, spatial models

Source:

The Journal of Wildlife Management. doi: 10.1002/jwmg.412.

Testing a ground-based canopy model using the wind river canopy crane

A ground-based canopy model that estimates the volume of occupied space in forest canopies was tested using the Wind River Canopy Crane. A total of 126 trees in a 0.25 ha area were measured from the ground and directly from a gondola suspended from the crane. The trees were located in a low elevation, old-growth forest in the southern Washington Cascades. The ground-...

Author(s):

Robert Van Pelt; Malcolm P. North

Year:

1999

Keywords:

canopy model, ground-based measurements, crane-based measurements, canopy model comparisons, old-growth canopy, Douglas-fir canopy, Douglas-fir, Pseudotsuga menziesii, western hemlock, Tsuga heterophylla

Source:

Selbyana, Vol. 20(2): 357-362

Modeling climate and fuel reduction impacts on mixed-conifer forest carbon stocks in the Sierra Nevada, California

Quantifying the impacts of changing climatic conditions on forest growth is integral to estimating future forest carbon balance. We used a growth-and-yield model, modified for climate sensitivity, to quantify the effects of altered climate on mixed-conifer forest growth in the Lake Tahoe Basin, California. Estimates of forest growth and live tree carbon stocks were...

Author(s):

Matthew D. Hurteau; Timothy A. Robards; Donald Stevens; David Saah; Malcolm North; George W. Koch

Year:

2014

Keywords:

Climate change, Growth-and-yield, Mitigation, Thinning, Wildfire, Adaptation

Source:

Forest Ecology and Management. 315: 30-42

Sampling scales define occupancy and underlying occupancy-abundance relationships in animals

Occupancy-abundance (OA) relationships are a foundational ecological phenomenon and field of study, and occupancy models are increasingly used to track population trends and understand ecological interactions. However, these two fields of ecological inquiry remain largely isolated, despite growing appreciation of the importance of integration. For example, using...

Author(s):

Robin Steenweg; Mark Hebblewhite; Jesse Whittington; Paul Lukacs; Kevin McKelvey

Year:

2018

Keywords:

abundance-occupancy, distribution-abundance, large mammals, mobile organisms, occupancy models, sampling, scale

Source:

Ecology. 99(1): 172-183.

Hypogeous ectomycorrhizal fungal species on roots and in small mammal diet in a mixed-conifer forest

The purpose of this study was to estimate the portion of an ectomycorrhizal (ECM) fungi root community with a hypogeous fruiting habit. We used molecular methods (DNA sequence analysis of the internally transcribed spacer [ITS] region of rDNA) to compare three viewpoints: ECM fungi on the roots in a southern Sierra Nevada Abies-dominated old-growth...

Author(s):

Antonio D. Izzo; Marc Meyer; James M. Trappe; Malcolm North; Thomas D. Bruns

Year:

2005

Keywords:

mycophagy, community structure, fecal pellet

Source:

Forest Science, Vol. 51(3): 243-254

Influence of soil thickness on stand characteristics in a Sierra Nevada mixed-conifer forest

Soil thickness can be an important factor influencing vegetation, yet few spatially explicit studies have examined soil horizon thickness and vegetation composition in summer drought forests. We compared seismic and soil penetration measurements of combined A + C and Cr horizon thickness, soil moisture and temperature, and stand variables in a contiguous 4-ha mixed-...

Author(s):

Marc D. Meyer; Malcolm P. North; Andrew N. Gray; Harold S. J. Zald

Year:

2007

Keywords:

Forest regeneration, refraction seismic method, soil moisture, soil temperature

Source:

Plant and Soil. 294(1-2): 113-123.

Total Publications in Treesearch: 53,230

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Population estimation with sparse data: The role of estimators versus indices revisited

Evaluating a new method for reconstructing forest conditions from General Land Office survey records

Estimation of effective population size in continuously distributed populations: There goes the neighborhood

Estimating historical forest density from land‐survey data: a response to Baker and Williams (2018)

Estimating riparian area extent and land use in the Midwest.

DNA markers for identifying individual snowshoe hares using field-collected pellets

Estimating individual tree mid- and understory rank-size distributions from airborne laser scanning in semi-arid forests

Estimating abundance of mountain lions from unstructured spatial sampling

Testing a ground-based canopy model using the wind river canopy crane

Modeling climate and fuel reduction impacts on mixed-conifer forest carbon stocks in the Sierra Nevada, California

Sampling scales define occupancy and underlying occupancy-abundance relationships in animals

Hypogeous ectomycorrhizal fungal species on roots and in small mammal diet in a mixed-conifer forest

Influence of soil thickness on stand characteristics in a Sierra Nevada mixed-conifer forest

Analyzing canopy structure in Pacific Northwest old-growth forests with a stand-scale crown model

Detecting genotyping errors and describing black bear movement in northern Idaho

Topographic variation in structure of mixed-conifer forests under an active-fire regime

Environmental DNA sampling of small-bodied minnows: Performance relative to location, species, and traditional sampling

Green above-stump weights for red oak, red maple and white birch in northern Michigan.

Understanding environmental DNA detection probabilities: A case study using a stream-dwelling char Salvelinus fontinalis

Climate change predicted to shift wolverine distributions, connectivity, and dispersal corridors

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