How many grizzlies in Yellowstone?

Article Abstract:

The exact number of grizzly bears at the Yellowstone National Park and whether it is increasing or decreasing has not yet been established. Since the closure of the dump, bears have been foraging at the residential areas, creating human-bear conflict. Population models used to estimate the number of bears indicate a drop after dumpsite closure. A more accurate count means large trapping efforts. Current estimates in 1995 show an increase in bear population. However, so has human use of bear territory. The bear-human conflict should not be resolved through bear destruction. Alternatives have to be found.

Environmental aspects, Wildlife management, Grizzly bear

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Using the Lotka-Leslie model for sea otters

Article Abstract:

Monte Carlo simulation is integrated into the Lotka-Leslie model for analyzing animal population dynamics to enable the arbitrary nature of the sea otter's reproductive behavior to be taken into account. To test the mean birth dates incorporated in the Monte Carlo model, population growth was simulated to obtain the rate of change of growth, delta. The obtained values are then compared with the delta values computed from simulated reproductive and survival rate data.

Models, Usage, Sexual behavior in animals, Animal sexual behavior, Sea otter, Sea otters, Monte Carlo method, Monte Carlo methods

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What should we do about hypothesis testing?

Article Abstract:

The author argues that difficulties applying hypothesis testing to wildlife studies stem primarily from using techniques designed for controlled research experiments in uncontrolled settings. Alternative methods that are less prone to these difficulties include population analysis, modeling, and sampling.

Methods, Evaluation, Measurement, Wildlife research, Hypothesis testing (Research method)

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