Drive counts for grey brocket deer Mazama gouazoupira in the Bolivian Chaco / Estimation de la population du cerf brun Mazama gouazoupira dans le Chaco de Bolivie par la méthode du dénombrement total

Mammalia ◽  
2006 ◽  
Vol 70 (1-2) ◽  
Author(s):  
Andrew J. Noss ◽  
Rosa Leny Cuéllar Salidas ◽  
Jhonny Ayala Crespo
Keyword(s):  
Wildlife Management ◽  
Management Program ◽  
Density Estimates ◽  
Count Density ◽  
Drive Counts ◽  
Brocket Deer

AbstractIn the context of a community wildlife management program with the Isoseño communities of the Bolivian Chaco, we tested drive sample counts as a method for estimating densities of grey brocket deer ( Mazama gouazoupira ). Drive count density estimates of 12–14/km

Drive counts for grey brocket deer Mazama gouazoupira in the Bolivian Chaco / Estimation de la population du cerf brun Mazama gouazoupira dans le Chaco de Bolivie par la méthode du dénombrement total

Mammalia ◽  
2006 ◽  
Vol 70 (1-2) ◽  
Author(s):  
Andrew J. Noss ◽  
Rosa Leny Cuéllar Salidas ◽  
Jhonny Ayala Crespo
Keyword(s):  
Wildlife Management ◽  
Management Program ◽  
Density Estimates ◽  
Count Density ◽  
Drive Counts ◽  
Brocket Deer

AbstractIn the context of a community wildlife management program with the Isoseño communities of the Bolivian Chaco, we tested drive sample counts as a method for estimating densities of grey brocket deer ( Mazama gouazoupira ). Drive count density estimates of 12–14/km

Assessing the sustainability of yellow anaconda (Eunectes notaeus) harvest in northeastern Argentina

2020 ◽  
Author(s):  
Bruno Camera ◽  
Christine Stüssmann ◽  
Itxaso Quintana ◽  
Tomás Waller ◽  
Mariano Barros ◽  
...  
Keyword(s):  
Wildlife Management ◽  
Sustainable Use ◽  
Management Program ◽  
Gradual Reduction ◽  
Hunting Season ◽  
Time Period ◽  
History Of ◽  
The Mean ◽  
The Tropics ◽  
Northeastern Argentina

Abstract Sustainable wildlife management is required to guarantee source species viability; however, it is practiced rarely in the tropics. The yellow anaconda (Eunectes notaeus) has a long history of being harvested for its leather. Since 2002 its harvest has operated under a management program in northeastern Argentina, which relies on adaptive management through limiting the minimum anaconda length, number of hunters and restricting the hunting season. We investigated the effects of the anaconda harvest on its biological parameters based on 2002-2016 data. Here we show that the levels of species exploitation are sustainable. The gradual reduction in the annual hunting effort, due to a decrease in number of hunters and hunting season duration, reduced the total number of anacondas harvested. Conversely, captures per unit effort increased across the study time-period. There was no variation in the mean length of anacondas harvested, or in largest anaconda sizes. Though more females than males were caught, the sex ratio did not vary significantly. We also found that a decrease in mean temperature positively influenced anaconda harvest and the captures of giant individuals. Because sustainable use is a powerful tool for conservation, those discoveries are highly applicable to other species and regions.

On bias, precision and accuracy in wildlife aerial surveys

2008 ◽  
Vol 35 (4) ◽  
pp. 253 ◽  
Author(s):  
Jim Hone
Keyword(s):  
Survey Data ◽  
Wildlife Management ◽  
Aerial Survey ◽  
Review Of The Literature ◽  
Density Estimates ◽  
True Value ◽  
Wildlife Population ◽  
Aerial Surveys ◽  
Precision And Accuracy ◽  
Definition Of

Bias, precision and accuracy have been studied extensively in wildlife population estimation including aerial surveys. A review of the literature shows that the concepts of bias and precision are used broadly consistently. Aerial survey data from known populations of feral pig carcases and white-tailed deer show that few density estimates are unbiased and precise. Research is needed, however, to clarify how much bias and how much precision are enough for the various types of wildlife management activities. Accuracy is used in two closely related but different ways. One set of definitions of accuracy relates to deviations from the true value (bias) and the second set relates to squared deviations from the true value (bias and precision). The implications are that authors are encouraged to clearly state which definition of accuracy they use, or focus solely on bias and precision.

scholarly journals Assumptions about fence permeability influence density estimates for brown hyaenas across South Africa

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Kathryn S. Williams ◽  
Samual T. Williams ◽  
Rebecca J. Welch ◽  
Courtney J. Marneweck ◽  
Gareth K. H. Mann ◽  
...  
Keyword(s):  
South Africa ◽  
Population Density ◽  
Wildlife Management ◽  
Management Decisions ◽  
Density Estimates ◽  
Future Studies ◽  
Dominant Feature ◽  
Capture Recapture ◽  
Number Of Individuals ◽  
Density Results

AbstractWildlife population density estimates provide information on the number of individuals in an area and influence conservation management decisions. Thus, accuracy is vital. A dominant feature in many landscapes globally is fencing, yet the implications of fence permeability on density estimation using spatial capture-recapture modelling are seldom considered. We used camera trap data from 15 fenced reserves across South Africa to examine the density of brown hyaenas (Parahyaena brunnea). We estimated density and modelled its relationship with a suite of covariates when fenced reserve boundaries were assumed to be permeable or impermeable to hyaena movements. The best performing models were those that included only the influence of study site on both hyaena density and detection probability, regardless of assumptions of fence permeability. When fences were considered impermeable, densities ranged from 2.55 to 15.06 animals per 100 km2, but when fences were considered permeable, density estimates were on average 9.52 times lower (from 0.17 to 1.59 animals per 100 km2). Fence permeability should therefore be an essential consideration when estimating density, especially since density results can considerably influence wildlife management decisions. In the absence of strong evidence to the contrary, future studies in fenced areas should assume some degree of permeability in order to avoid overestimating population density.

Interpreting puma (Puma concolor) population estimates for theory and management

1997 ◽  
Vol 24 (3) ◽  
pp. 283-289 ◽  
Author(s):  
K. SHAWN SMALLWOOD
Keyword(s):  
Wildlife Management ◽  
Puma Concolor ◽  
Spatial Scales ◽  
Local Population ◽  
Field Studies ◽  
Estimation Methods ◽  
Land Uses ◽  
Density Estimates ◽  
Interpretive Design ◽  
Range Of Variation

Estimates of population size have been essential for ecological theory and wildlife management, but they depend on spatial scales of observation. Reported aspects of study and interpretive design were tested to see if they could explain variation in puma (Puma concolor) density. Comparison of puma studies revealed information shortfalls and possible confounding effects in research trends. Vegetation descriptions and other biological and physical aspects of the study site explained none of the 30-fold range of variation in puma density, nor did sampling and estimation methods and other aspects of study and interpretive design. Most (78%) of the variation in puma density estimates can be explained by the spatial extent of study area. Given the effect of scale, puma density estimates have been inappropriately extrapolated to larger geographic areas for management purposes. Due to spatial shifting of local population clusters, conventional density estimates cannot contribute to assessments of puma population trend without study at multiple sites over longer periods of time. Field studies would contribute more to knowledge of puma by spanning larger areas, a greater variety of land uses and habitats, and more of puma's range of distribution.

Forest diversity: An approach to forest wildlife management

1975 ◽  
Vol 51 (3) ◽  
pp. 99-104
Author(s):  
Karl Siderits
Keyword(s):  
Wildlife Management ◽  
Habitat Management ◽  
Habitat Diversity ◽  
Management Program ◽  
Wildlife Habitat ◽  
National Forest ◽  
Age Classes ◽  
Forest Diversity ◽  
Ecological Principles

The Superior National Forest has instituted a forest wildlife habitat management program which identifies vegetational type, age classes and stand distribution as prime management components. The program incorporates basic ecological principles pertaining to diversity and stability, enabling land managers to pinpoint wildlife management needs more accurately in terms of habitat diversity.

The co-occurrence of moose, white-tailed deer, and Parelaphostrongylus tenuis in Ontario

1994 ◽  
Vol 72 (5) ◽  
pp. 819-825 ◽  
Author(s):  
Heather A. Whitlaw ◽  
Murray W. Lankester
Keyword(s):  
Population Density ◽  
Natural Resources ◽  
Wildlife Management ◽  
Mortality Factors ◽  
Density Estimates ◽  
Mean Intensity ◽  
The Past ◽  
Deer Density ◽  
Parelaphostrongylus Tenuis ◽  
Trend Data

Moose (Alces alces) populations were studied in parts of Ontario where they cohabit with white-tailed deer (Odocoileus virginianus) infected with Parelaphostrongylus tenuis. Trend data on changes in cervid numbers for the period 1980–1992, current population density estimates, and records of moose sickness were obtained from Ontario Ministry of Natural Resources managers; presence and abundance of P. tenuis were determined by examining winter deer feces for dorsal-spined larvae. Moose and deer coexist in 45 of 83 Ontario Wildlife Management Units (WMUs) surveyed and have persisted there for at least the past 12 years. Cervid populations in most of these WMUs are presently believed to be stable or increasing. Moose density was inversely related to deer density and was greatest where the latter was <4/km2. In addition, moose densities were lowest in areas with the highest mean intensity of P. tenuis larvae in deer feces. Nonetheless, the documented persistence of moose in numerous areas with infected deer, and case studies of recent moose declines, suggest that the effect of this parasite on moose populations is more subtle than was previously believed, and further study is required to separate and measure its importance relative to other mortality factors known to act on moose populations.

Electron investigations of rhabdovirus-like particles in mexican bean beetles and crickets

1978 ◽  
Vol 36 (2) ◽  
pp. 378-379
Author(s):  
J. R. Adams ◽  
G. J Tompkins ◽  
A. M. Heimpel ◽  
E. Dougherty
Keyword(s):  
Biological Control ◽  
Integrated Pest Management ◽  
Pest Management ◽  
Developmental Stages ◽  
Management Program ◽  
Acheta Domesticus ◽  
Epilachna Varivestis ◽  
House Cricket ◽  
Similar Morphology ◽  
Bean Beetle

As part of a continual search for potential pathogens of insects for use in biological control or on an integrated pest management program, two bacilliform virus-like particles (VLP) of similar morphology have been found in the Mexican bean beetle Epilachna varivestis Mulsant and the house cricket, Acheta domesticus (L. ).Tissues of diseased larvae and adults of E. varivestis and all developmental stages of A. domesticus were fixed according to procedures previously described. While the bean beetles displayed no external symptoms, the diseased crickets displayed a twitching and shaking of the metathoracic legs and a lowered rate of activity.Examinations of larvae and adult Mexican bean beetles collected in the field in 1976 and 1977 in Maryland and field collected specimens brought into the lab in the fall and reared through several generations revealed that specimens from each collection contained vesicles in the cytoplasm of the midgut filled with hundreds of these VLP's which were enveloped and measured approximately 16-25 nm x 55-110 nm, the shorter VLP's generally having the greater width (Fig. 1).

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