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Matrix population models require the population to be divided into discrete stage classes. In many cases, especially when classes are defined by a continuous variable, such as length or mass, there are no natural breakpoints, and the division is artificial. We introduce the “integral projection...
Elasticity analysis is a useful tool in conservation biology. The relative impacts of proportional changes in fertility, juvenile survival, and adult survival on asymptotic population growth λ (where ln(λ) == r, the intrinsic rate of increase) are determined by vital rates (survival, growth,...
The aim of the present study was to test the hypothesis that temporal differences in food chain composition affect lower trophic levels not only directly, by predation and grazing, but also indirectly, by inducing avoidance behavior. In a field study, the recruitment rate from the sediments to...
Coexistence of species is generally attributed to the interacting roles of competition, predation, and disturbance. Overgrowth is considered to be an important mechanism of competition for space, and species are often ranked in hierarchies based on their abilities to overgrow. In some marine...
The degree to which a variable's dynamics are synchronized among a set of neighboring lakes indicates the relative influence of regional climate variability. Furthermore, by determining which lakes tend to be most synchronous in their response to climate we can deduce the primary ways that...
Elasticities of λ indicate the influence of demographic parameters on both individual fitness and population growth for a population with density-independent growth. Here we discuss the extension of elasticity analysis to populations with density-dependent demographic parameters and examine the...
A central goal in ecology is to predict population dynamics from demographic information. Based on the asymptotic population growth rate λ, calculated from a projection matrix model as a descriptor of the population dynamics, we analyze published data of 49 species of birds to determine how λ...
Demographic perturbation analysis explores how population statistics (especially population growth rate λ) respond to changes in the vital rates (survival, growth, development, reproduction, and so on). Perturbation analysis is used in two logically distinct ways. Prospective analyses...
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