Read e-book online Ecology: A Textbook PDF

By Professor Dr. Hermann Remmert (auth.)

ISBN-10: 3540100598

ISBN-13: 9783540100591

ISBN-10: 3642676359

ISBN-13: 9783642676352

The wealth of the usual sciences now not is composed within the abundance of evidence, yet within the means they're associated jointly. ALEXANDER VON HUMBOLDT there is not any dearth of books on ecology. Why write one more? every body is diverse, and every perspectives the issues otherwise. every one emphasizes diverse facets and describes them in a special sort. whilst i used to be a scholar I usually chanced on definite books extra priceless than others, and that i nonetheless imagine it really is necessary to have a number of displays from which to settle on. This style additionally permits the coed to understand the variety in the box of ecology. i've got committed significant attempt to creating this booklet readable. all through i've got avoided utilizing really expert terminology - therefore additionally averting the matter that many phrases are used another way within the a variety of components of ecology. simple English is sort of enough to explain advanced occasions. in addition, accurately outlined phrases tend to be linked to particular quantitative descriptions, while we're fascinated about a normal knowing of the dynamics of ecology. For related purposes i've got attempted to depend as low as attainable on mathematical discussions. All too frequently, in recent times, humans have ignored the truth that arithmetic - like language - can provide just a description, albeit a particularly specific one.

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Additional info for Ecology: A Textbook

Sample text

Kleiber, 1967) are concerned, the possible biomass per unit area is much greater. 5 kg of hay per day (2,738 kg over the entire year) can theoretically feed a 600-kg cow for an entire year. But only 75 rabbits, totalling ISO kg, can be fed for a year on the same area (cf. p. 205). Statements about the biomass of animals in a habitat, then, are not in themselves informative. At least the mean body size of the species must be given (Fig. 32). The relatively higher food consumption and the relatively higher metabolic rate of small organisms naturally finds expression in other fundamental ecological parameters.

60 'j9 -l --dp S9 03 Fig. 29. Nitrogen uptake, urea exchange, and protein flow out of the anterior stomachs (rumen and reticulum) of the llama, when fed on a control and a protein-depleted diet. All data in g nitrogen per 24 h. When the diet is low in protein urea is returned to the digestive stomach, and the permeability of the walls of the anterior stomachs to urea is increased. Despite the reduced excretion of urea through the kidneys, the amount of urea in the body was thus reduced. The urea-nitrogen not used up is resorbed as ammonia and resynthesized to urea in the liver (Ali, 1977).

This is by no means necessarily the case. Behavioral research has shown that brooding geese presented with eggs of different sizes will choose one much larger than their own. Here the preferendum is far from the optimum. And we know that similar discrepancies can occur in the realm of ecol0 0 ogy. The Mediterranean cricket Gryllus bimaculatus has a temperature preferendum in the region of 34°C. But the optimum for this species is much lower, between 25° and 31 dc. This range is so wide because the measured optima differ, depending on the function being analyzed - egg production, the quantity of reserve substances in the eggs, the rate of development to the imago stage, the final size of the imago, or the level of mortality.

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Ecology: A Textbook by Professor Dr. Hermann Remmert (auth.)

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