A population estimator based on network sampling of tracks in the snow

Article Abstract:

It is difficult to estimate the size of populations for animals that are secretive and rare, such as mountain lions and lynxes. Past population size estimates of large furbearing species have included home range density, model-bases estimates and animal counts. A new estimator technique is based on network sampling of animal tracks in the snow. The method can be used for low-density species whose tracks can be traced using a small, low-flying aircraft. A stratified network sample design is used to obtain population estimates. The technique is used on gray wolf populations in Interior Alaska, where 37 groups containing 173 wolves were observed.

Methods, Surveys, Observations, Wolves, Alaska, Statistical sampling, Sampling (Statistics), Gray wolf, Animal tracks

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On the use of demographic models of population viability in endangered species management

Article Abstract:

Demographic models are often used to decide on the management of wild, endangered species, the commonest model being Population Viability Analysis (PVA). A new study evaluates the use of demographic models for the management of endangered species and reviews the most frequently used models. It is suggested that predictions from some models are unreliable because of poor demographic information and that links between PVA models and recovery options be established through field testing model assumptions and field validating secondary model predictions.

Usage, Mathematical models, Endangered species

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Sampling Plethodontid salamanders: sources of variability

Article Abstract:

An overview is presented on sampling methods used to assess salamander populations in Great Smoky Mountains National Park. The authors found that, while large-scale habitat factors help explain distribution and abundance patterns, current research methods are insufficient for detecting long-term trends in populations.

North Carolina, Tennessee, Statistical Data Included, Management, Environmental aspects, Habitat (Ecology), Biological diversity, Biodiversity, Habitats, Great Smoky Mountains National Park, North Carolina and Tennessee, Plethodontidae, Plethodontid salamanders

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