An algorithm is described which determines model parameters for the vitality-based survival
model [Ecological Monographs 70 (2000) 445]. The algorithm uses an MLE estimator on …

Survivorship curves, describing the fraction of a cohort alive as a function of age, have three
typical forms; linear, convex, and concave depending on whether mortality is constant over …

Ecologists frequently measure and compare mortality rates and other count-dependent rates
of change. The simplest measures employ mortality counts for predetermined populations …

A survivorship curve is shaped by the differential survivability of the organisms within the
population, and a change in a survivorship curve with a stressor reflects the differential …

Ecologists have long been interested in modelling survivorship of biological units such as
plants and animals. The Weibull distribution has been noted to be one of the most suitable …

We consider a range of models that may be used to predict the future persistence of
populations, particularly those based on discrete-state Markov processes. While the …

We consider both parametric and nonparametric statistical analyses of survivorship curves
and of removal rates, including assumptions, tests, ecological applications, and the …

An increasing number of studies have investigated the diversity of actuarial senescence (ie
the increase of mortality with age) and mortality patterns in the wild. Most of these studies …

A method of sensitivity analysis for population viability models is presented that uses logistic
regression to evaluate the importance of model parameters that influence the risks of …

We outline a general method to carry out population viability analyses (PVA) by making we
of matrix population models. We consider a structured population (by age, sex, reproductive …