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Read e-book online Animal Population Ecology PDF

By J. Dempster (Auth.)

ISBN-10: 0122095502

ISBN-13: 9780122095504

A few uncomplicated thoughts. assets. Social behaviour. Qualitative adjustments in members. typical enemies. climate. distinct inhabitants experiences. Popolation cycles. inhabitants theories. functions of inhabitants ecology

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Example text

Under a different set of conditions however, the other species may predominate. Birch (1953) found for example, that in mixed cultures of Calandra oryzae and Rhizopertha dominica, Rkizopertha became extinct at 29°C, but Calandra did so at 32°C. Calandra had the higher innate capacity for increase at 29°C, whilst that of Rhizopertha was highest at 32°C. The elimination of one species by another is far less likely to occur in wild populations, since the varying environment will give an advantage first to one species, then to another.

There have been a number of laboratory studies of inter-specific competition under controlled conditions (Gause, 1934; Crombie, 1945; Park, 1948; Birch, 1953). Many of these experiments have produced similar results, namely, that when two species share the same limited resource and all other environmental factors are kept constant, one species dies out. Under any one set of environmental conditions one species has an advantage over the other and will eliminate it. Under a different set of conditions however, the other species may predominate.

Birch (1953) found for example, that in mixed cultures of Calandra oryzae and Rhizopertha dominica, Rkizopertha became extinct at 29°C, but Calandra did so at 32°C. Calandra had the higher innate capacity for increase at 29°C, whilst that of Rhizopertha was highest at 32°C. The elimination of one species by another is far less likely to occur in wild populations, since the varying environment will give an advantage first to one species, then to another. In this way several species may share the same resource, but all may be able to persist under field conditions.

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Animal Population Ecology by J. Dempster (Auth.)


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