Download PDF by John C. Kricher: A field guide to California and Pacific Northwest forests

By John C. Kricher

ISBN-10: 0395928966

ISBN-13: 9780395928967

This entire box consultant contains the entire wildlife you are probably to determine within the forests of California and the Pacific Northwest. With fifty three colour plates and eighty colour pictures illustrating timber, birds, mammals, wildflowers, mushrooms, reptiles, amphibians, butterflies, moths, and different insects.

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Extra info for A field guide to California and Pacific Northwest forests

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The inertial resilience of landscape pattern will thus tend to be higher in physically diverse landscapes (such as mountains) than in flat topographic regions. If the above characteristics are altered by disturbance in landscapes lacking strong physical diversity, ECOLOGICAL AND ENVIRONMENTAL CONCEPTS 35 elastic stability may be very low. However, disturbance probability and severity are sometimes related to characteristics of the forest plant community, so the biota may contribute to inertial stability in some forest landscapes with low physical diversity, at least under moderate- to low-severity disturbance.

The features of an ecological situation determine the domain of validity of statements about stability. There are numerous complications. Does ‘stability’ refer to gene diversity, genetic makeup, population size, persistence of a species locally or regionally, community composition and structure, the five key characteristics of ecosystems (structure, function, complexity, interaction of the parts, and change in all of these over time), or to some other biotic or ecosystem variable? ‘Stability’ is often thought of as constancy and lack of change, but because all of these biotic categories and ecosystems are continually changing, it would seem that in this interpretation there is no stability in nature, in which case why would maintaining ‘stability’ be a management and conservation objective?

Scenes of polluted air and poisoned rivers and lakes, together with pictures of dead and dying plants and animals, made the idea of ‘sick ecosystems’ easy for the public to embrace. As environmentalists and the media increasingly portrayed ‘sick’ and ‘dying’ ecosystems as being worthy of the same concern as sick and dying people, the question of forest and ecosystem health became an important issue in the evolving debate about the environment. It is widely accepted that human health requires ‘ecosystem health’ (Rockström et al, 2009), though exactly what this means is rarely defined.

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A field guide to California and Pacific Northwest forests by John C. Kricher


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