Download e-book for iPad: Animal Ecology To-Day by F. S. Bodenheimer (auth.)

By F. S. Bodenheimer (auth.)

ISBN-10: 940175845X

ISBN-13: 9789401758451

ISBN-10: 9401763100

ISBN-13: 9789401763103

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Its more important columns are: l = survivorship at a certain age; d = death cases occurring at each age-class; q = death-rate at a given age-class, provided the entire population is composed of this age-class ; e = average lifeexpectance of an individual after having reached a given age. The normal and usual conception of longevity is that called here ecological longevity. 4. Age-Distribution in Animal Populations A greatly neglected study in animal ecology is that of age-structure of populations.

The few survivors participate in the formation of the normal first generation. The generation IA is therefore also of little importance in the maintenance of the species. The brothers of those parents which did not oviposit in October hibernate. They are active, with interruptions, during the winter, especially on sunny days, and even oviposit occasionally. From the eggs of the hiberating second generation, the first generation develops in March. V/e thus observe two annual generations in the coastal plain in spring and autumn which develop more or less sterile sidelines, one each in summer and winter.

14 Approximate % of conjugants induced .. 2 The exponential growth is soon broken and changed into the general curve of organism growth, the logistic curve. , and inhibition of reproduction - in this case division. e. conjugation. In our Paramaecium culture the latter factor alone worked. The following scheme may illustrate how destruction, as well as inhibition, induced up to a certain degree and increasing up to a certain point parallel to growing population density, will change the exponential into a logistic growth (Fig.

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Animal Ecology To-Day by F. S. Bodenheimer (auth.)

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