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Recently, environmental scientists have been required to perform a new type of assessment-ecological risk assessment. This is the first book that explains how to perform ecological risk assessments and gives assessors access to the full range of useful data, models, and conceptual approaches they need to perform an accurate assessment. It explains how ecological risk assessment relates to more familiar types of assessments. It also shows how to organize and conduct an ecological risk assessment, including defining the source, selecting endpoints, describing the relevant features of the receiving environment, estimating exposure, estimating effects, characterizing the risks, and interacting w...
Cybernetics, a science concerned with understanding how systems are regulated, has reflected the preoccupations of the century in which it was born. Regulation is important in twentieth century society, where both machines and social organizations are complex. Cybernetics focused on and became primarily associated with the homeostasis or stability of system behavior and with the negative feedbacks that stabilize systems. It paid less attention to the processes opposite to negative feedback, the positive feedback processes that act to change systems. We attempt to redress the balance here by illustrating the enormous importance of positive feedbacks in natural systems. In an article in the Am...
All life on earth occurs in natural assemblages called communities. Community ecology is the study of patterns and processes involving these collections of two or more species. Communities are typically studied using a diversity of techniques, including observations of natural history, statistical descriptions of natural patterns, laboratory and field experiments, and mathematical modelling. Community patterns arise from a complex assortment of processes including competition, predation, mutualism, indirect effects, habitat selection, which result in the most complex biological entities on earth – including iconic systems such as rain forests and coral reefs. This book introduces the reade...
Why "the balance of nature"? Resilience. Temporal variability and the individual species. The effects of food-web structure. The variability of the environment. Nonlinear dynamics, strange attractors, and chaos. Extinctions. Species differences and community structure as explanations of why introductions fail. Patterns in species composition. Food-web structure and community persistence. Community assembly; or why are there so many kinds of communities? Small-scale experimental removals of species. Food webs and resistance. Changes in total density and species composition. The consequences of introductions and extinctions. Multispecies models and their limitations. Conclusions and caveats.
The idea behind The Unity of Nature is a strong theoretical theme in a number of scientific and environmental fields from ecosystems ecology, through quantum physics to environmental philosophy and ecopolitics giving rise to an inspiring, optimistic, socially-responsive and environment-friendly worldview. The fields of science and environmentalism have inherited this theme of natural unity through an intellectual lineage that encompasses many non-scientific and non-environmental fields such as sociology, theology and political philosophy. Many of these fields have used natural unity in a way which is in stark opposition to the metaphysical and political desires of those who promulgate the unity of nature for progressive social change.This book discusses how this has transpired and examines the social and intellectual processes that have been at work. These include the social construction of the Organicism versus Mechanicism debate in ecology, the intellectual links between neo-classical economic principles and the ‘New Sciences’, the techno-scientific background of Gaia theory, and the social conservatism of ecological functionalism.
Why are there often sudden abrupt changes in public opinion on political issues? Or total reversals in congressional support for specific legislation? Jones aims to answer these questions by connecting insights from cognitive science and rational-choice theory to political life.
Includes entries for maps and atlases.