C.M. Francis, Erica H. Dunn, P.J. Blancher, S.R. Drennan, M.A. Howe, D. Lepage, C.S. Robbins, K.V. Rosenberg, J.R. Sauer, Kimberly G. Smith
2004, American Birds (58) 34-43
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Publication Extents
Not all publications have extents, not all extents are completely accurateD.K. Niven, J.R. Sauer, G.S. Butcher, W.A. Link
2004, American Birds (58) 10-20
M.T. Southerland, R.E. Jung, D.P. Baxter, I.C. Chellman, G. Mercurio, J.H. Volstad
2004, Applied Herpetology (2) 23-46
Biological indicators are critical to the protection of small, headwater streams and the ecological values they provide. Maryland and other state monitoring programs have determined that fish indicators are ineffective in small streams, where stream salamanders may replace fish as top predators. Because of their life history, physiology,...
Chandler S. Robbins
2004, North American Bird Bander (29) 126-126
The most notable finding at this station in 2003 was the sharp decline in recaptures of previously banded birds and most especially a Crash in the chickadee and titmouse populations. In the autumn of 2001, I recaptured 36 birds banded in previous autumns, but I caught only 24 returns in...
Chandler S. Robbins
2004, The Auk (121) 273-275
This intimate historical account was contracted in 1996 by Environment Canada to naturalist-writer Burnett, who interviewed more than 120 present and former Canadian Wildlife Service (CWS) employees of the 1947–1997 period. Each of the 10 chapters addresses a major topic, followed by a brief account of the chief activities of...
J. Andrew Royle, D.K. Dawson, S. Bates
2004, Ecology (85) 1591-1597
Distance-sampling methods are commonly used in studies of animal populations to estimate population density. A common objective of such studies is to evaluate the relationship between abundance or density and covariates that describe animal habitat or other environmental influences. However, little attention has been focused on methods of modeling abundance...
Bruce G. Peterjohn
2004, The Wilson Bulletin (116) 281-282
The first North American breeding bird atlases were initiated during the 1970s. With atlases completed or ongoing in more than 40 U.S. states and most Canadian provinces, these projects are now familiar to professional ornithologists and amateur birders. This book provides the results of the Oklahoma Breeding Bird Atlas, the...
J.R. Sauer, W.A. Link, D.K. Niven
2004, American Birds (58) 21-25
Glenn H. Olsen
2004, Journal of Avian Medicine and Surgery (18) 269-272
Mississippi sandhill cranes (Grus canadensis pulla) are a highly endangered species that live in the wild in 1 county in Mississippi. As part of a large effort to restore these endangered cranes, we are conducting a project to look at the causes of mortality in crane chicks on the...
P.F. Doherty Jr., E.A. Schreiber, J.D. Nichols, J.E. Hines, W.A. Link, G.A. Schenk, R.W. Schreiber
2004, Oikos (105) 606-618
Life history theory and associated empirical generalizations predict that population growth rate (λ) in long-lived animals should be most sensitive to adult survival; the rates to which λ is most sensitive should be those with the smallest temporal variances; and stochastic environmental events should most affect the rates to which...
J. Andrew Royle
2004, Biometrics (60) 108-115
Spatial replication is a common theme in count surveys of animals. Such surveys often generate sparse count data from which it is difficult to estimate population size while formally accounting for detection probability. In this article, I describe a class of models (n-mixture models) which allow for estimation of population...
D.J. Twedt
2004, North American Bird Bander (29) 171-174
I identified sexual dimorphism in wing length (unflattened chord) of Carolina Wrens (Thryothorus ludovicianus) within the central Mississippi Alluvial Valley (northeast Louisiana and west-central Mississippi) and used this difference to assign a sex to captured wrens. Wrens were identified as female when wing length was less than 57.5 mm...
J.D. Nichols, W. L. Kendall, J.E. Hines, J. A. Spendelow
2004, Ecology (85) 3192-3201
Many animals lack obvious sexual dimorphism, making assignment of sex difficult even for observed or captured animals. For many such species it is possible to assign sex with certainty only at some occasions; for example, when they exhibit certain types of behavior. A common approach to handling this situation in...
M.C. Pinto, Afred L. Gardner
2004, Mastozoologia Neotropical (11) 257-260
J.D. Nichols
2004, Animal Biodiversity and Conservation (27) 3-19
The EURING meetings and the scientists who have attended them have contributed substantially to the growth of knowledge in the field of estimating parameters of animal populations. The contributions of David R. Anderson to process modeling, parameter estimation and decision analysis are briefly reviewed. Metrics are considered for assessing individual...
J.D. Nichols, D.I. MacKenzie
2004, Animal Biodiversity and Conservation (27) 437-439
Abundance is the state variable of interest in most population–level ecological research and in most programs involving management and conservation of animal populations. Abundance is the single parameter of interest in capture–recapture models for closed populations (e.g., Darroch, 1958; Otis et al., 1978; Chao, 2001). The initial capture–recapture models developed...
M.G. Efford, D.K. Dawson, C.S. Robbins
2004, Animal Biodiversity and Conservation (27) 217-228
A general computer-intensive method is described for fitting spatial detection functions to capture-recapture data from arrays of passive detectors such as live traps and mist nets. The method is used to estimate the population density of 10 species of breeding birds sampled by mist-netting in deciduous forest at Patuxent...
D.I. MacKenzie, J.D. Nichols
2004, Animal Biodiversity and Conservation (27) 461-467
In many monitoring programmes it may be prohibitively expensive to estimate the actual abundance of a bird species in a defined area, particularly at large spatial scales, or where birds occur at very low densities. Often it may be appropriate to consider the proportion of area occupied by the...
Gary C. White, J.E. Hines
2004, Animal Biodiversity and Conservation (27) 175-176
The reality is that the statistical methods used for analysis of data depend upon the availability of software. Analysis of marked animal data is no different than the rest of the statistical field. The methods used for analysis are those that are available in reliable software packages. Thus, the critical...
W.A. Link
2004, Animal Biodiversity and Conservation (27) 87-91
Individual heterogeneity in detection probabilities is a far more serious problem for capture-recapture modeling than has previously been recognized. In this note, I illustrate that population size is not an identifiable parameter under the general closed population mark-recapture model Mh. The problem of identifiability is obvious if the population includes...
W.A. Link, R. J. Barker
2004, Animal Biodiversity and Conservation (27) 441-449
The development of sophisticated mark-recapture models over the last four decades has provided fundamental tools for the study of wildlife populations, allowing reliable inference about population sizes and demographic rates based on clearly formulated models for the sampling processes. Mark-recapture models are now routinely described by large numbers of parameters....
J. Andrew Royle
2004, Animal Biodiversity and Conservation (27) 375-386
I consider modeling avian abundance from spatially referenced bird count data collected according to common protocols such as capture?recapture, multiple observer, removal sampling and simple point counts. Small sample sizes and large numbers of parameters have motivated many analyses that disregard the spatial indexing of the data, and thus...
C. T. Moore, W. L. Kendall
2004, Animal Biodiversity and Conservation (27) 287-296
Managers of wildlife populations commonly rely on indirect, count-based measures of the population in making decisions regarding conservation, harvest, or control. The main appeal in the use of such counts is their low material expense compared to methods that directly measure the population. However, their correct use rests on...
S. E. Reid, J. L. Marion
2004, Environmental Conservation (31) 274-282
The expansion and proliferation of backcountry campsites is a persistent problem in many parks and protected areas. Shenandoah National Park (SNP) has one of the highest backcountry overnight use densities in the USA national parks system. SNP managers implemented a multi-option backcountry camping policy in 2000 that included...
Marc Kery, Katharine B. Gregg
2004, Journal of Ecology (92) 686-695
1. We use capture-recapture models to estimate the fraction of dormant ramets, survival and state transition rates, and to identify factors affecting these rates, for the terrestrial orchid Cypripedium reginae. We studied two populations in West Virginia, USA, for 11 years and investigated relationships between grazing and demography. Abe Run's...