Showing papers in "Ecological Modelling in 1987"

TL;DR: A comparison of the properties of all the models for home range considered here shows that both the Fourier Transform method proposed by D.J. Anderson and the kernel method are good because of their flexibility.

TL;DR: In this article, the authors give necessary and sufficient conditions for perfect aggregation in non-linear dynamical systems, and apply the theory to several ecological examples to support the general principle of aggregating variables that functionally are either similar or complementary.

TL;DR: A review of the principal policy-related issues for which the professions of ecology and economics provide conflicting prescriptions is given in this paper, with emphasis on the work of the World Bank, although the issues raised are relevant to a broad range of organizations.

TL;DR: A special issue of the Ecological Modeling devoted to ecological economics is described in this article. But it does not cover the important theoretical issues involved in the synthesis of ecology and economics that could lead to better management of renewable and non-renewable natural resources.

TL;DR: Three generic models of population-toxicant interactions, each with an explicit representation for a dynamic resource, have been developed and analyzed for persistence-extinction phenomena and show that if the population exhibits a potential for growth and if there is input of resource, then the population will persist.

TL;DR: In an attempt to set out some of the foundations for an ecological economics, the authors interprets the objective of a sustainable society as one in which a Rawls-style concept of distributive justice is applied in an intergenerational context.

TL;DR: The matrix of total flows can be considered the kernel for a more nearly canonical version of input-output analysis, which provides a more convenient starting point for such tasks as sensitivity analyses, description of cycles, identification of key compartments, optimal resource reallocation, and definition of trophic status.

TL;DR: The history of biophysical economics can be traced from the 18th-century Physiocrats to current empirical research, with emphasis on those individuals who contributed to the development of Biophysical economic theory as discussed by the authors.

TL;DR: Lepg et al. as mentioned in this paper studied the development of spatial patterns of a single even-aged population in a homogeneous area by means of simulation and analytical models and found that the main factor causing the decrease of aggregation intensity or tendency to regularity in the course of population development is the competition among neighbouring individuals.

TL;DR: A stochastic computer model that simulates recruitment of the mallard (Anas platyrhynchos) under different habitat conditions and management scenarios is described.

TL;DR: A classification of sources of error is presented as a step toward better model construction and examples of types of error at each modeling step are given along with recommendations for evaluating their magnitude.

TL;DR: This paper explores how a third macro phenomena, social organization based on specialization and exchange, has contributed to the demise of biological diversity.

TL;DR: Factors that might have caused a recent increase of jellyfish populations in the Mediterranean sea are investigated using a simple predator-prey model and insufficiently high nutrient enrichment, or a decrease in jellyfish competitors or predators, may cause the appearance of a stable limit cycle.

TL;DR: The annual energy budget in the northern basin of Lake Biwa is summarized, and the annual entropy fluxes associated with direct, diffuse and reflected shortwave radiation in the Lake are calculated.

TL;DR: Using mathematical methods developed for solving analogous equations in physics, one can obtain analytical results for a variety of assumptions concerning organism growth rates using the Von Foerster equation.

TL;DR: A variety of new analysis and manipulation tools could become available to ecological modelers if artificial intelligence techniques were applied.

TL;DR: The present simple model for evaporation can be easily incorporated within runoff models and hence within dispersion models for contaminant transport by surface water.

TL;DR: The authors describes areas in which Marxists can benefit from a biophysical analysis of economic production and biophysical economists can benefit with a Marxist analysis of valuation and distribution, and describes how dialectical analysis can improve their understanding of the relation between resource quality and economic production.

TL;DR: The model steady-state dynamics of the water body is in good agreement with the existing ideas about the succession of vegetation types under increasing nutrient load.

TL;DR: Predicting population dynamics of a bacterial biological control agent on the foliage of red pine seedlings and subsequent effects on conidial germination of a fungal plant pathogen found that recoverable populations of bacteria were extremely sensitive to leaf wetness but relatively insensitive to temperature.

TL;DR: In this article, a three-dimensional diffusion model for the central part of the lagoon of Venice is presented, with the objective of studying the temporal evolution and steady-state condition of the dispersion of pollutants and nutrients in the Lagoon.

TL;DR: In this paper, the authors propose an event tree analysis that couches the uncertainty of projections in terms of relative risk associated with various management options for the Georges Bank haddock stock (Melanogrammus aiglefinus L).

TL;DR: In this article, the authors give necessary and sufficient conditions for stability of the investigated agroecological production system driven by a quite commonly used control strategy concept, which includes a prefixed and required output flow of products and an input flow of resources replacing the system's internal resources used for production or reduced due to natural losses.

TL;DR: In this article, a scenario study of the necessary environmental measures has been formulated, their effects on the environment have been estimated in physical terms and their costs in money terms, and the negative consequences for production and the positive consequences for employment have been scanned with the aid of an econometric model.

TL;DR: The model accurately describes changes in the three population abundances through the summer season, although a test of its predictive potential using 1984 data gave equivocal results, and the advantages of transition matrix models in general are discussed.

TL;DR: Under conditions of strong density-dependent pupal mortality (rather dry tupelo forests) the modeled population exhibits damped oscillations and approaches equilibrium in a few years, while a method to achieve more regular dynamics through introduction of spatial heterogeneity into the model is illustrated.

TL;DR: A simulation model for slash pine (Pinus elliottii ) forests predicts that 30-40% less carbon would be stored in north Florida forests over 24 years by planting 40 000 ha year −1 of slash pine biomass plantations with an 8-year rotation as mentioned in this paper.

TL;DR: In this article, a modellistic study aimed at describing the multi-dimensional diffusion of pollutants in the central part of the lagoon of Venice is presented, where an original solution is proposed for conditions at the 'open' boundaries, i.e., boundaries derived from restricting the modelled area and not from real physical delimitations.

TL;DR: The logistic equation can be modified to describe both pure exploitative and pure interference competition, and the relation between the rate of change per individual of one species and abundance of the second is non-linear; this is an important consideration when exploiting competitive species.