By Professor Dr. Hermann Remmert (auth.)

The wealth of the normal sciences now not is composed within the abundance of evidence, yet within the manner they're associated jointly. ALEXANDER VON HUMBOLDT there is not any dearth of books on ecology. Why write another? everybody is assorted, and every perspectives the issues differently. each one emphasizes various features and describes them in a distinct variety. whilst i used to be a pupil I frequently came upon definite books extra invaluable than others, and that i nonetheless imagine it truly is invaluable to have quite a few shows from which to decide on. This kind additionally permits the scholar to understand the range in the box of ecology. i've got committed enormous attempt to creating this booklet readable. all through i've got kept away from utilizing really good terminology - therefore additionally heading off the matter that many phrases are used in a different way within the a number of parts of ecology. easy English is sort of enough to explain complex events. in addition, accurately outlined phrases tend to be linked to targeted quantitative descriptions, while we're occupied with a normal figuring out of the dynamics of ecology. For related purposes i've got attempted to depend as low as attainable on mathematical discussions. All too usually, lately, humans have neglected the truth that arithmetic - like language - may give just a description, albeit a particularly particular one.

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One reason is that such direct absorption is more difficult in view of the osmotic gradients involved; furthermore, the numerous bacteria in fresh water remove from it essentially all of the free amino acids and carbohydrates (most of which are derived from the metabolism of planktonic algae and lower animals). The fresh-water clam Pisidium does take up glucose even when it is present only at the concentrations found in the natural environment. 05% of the animal's energy requirement - in marked contrast to the marine situation, in which 100% of the required energy can be obtained from dissolved substances.

1957) sunbathing butterflies and lizards can achieve body temperatures above 35 "C, whereas at night they are chilled by frost. Can we make direct comparisons between such changing temperatures and what we know about the effects of constant temperatures? If we know the time (in hours or minutes) during which an organism is exposed to a particular temperature, and its rate of development under constant temperatures, we should be able to calculate how long it would need for development under a particular changing-temperature regime.

That is, very slight temperature differences can have very large or small effects. We can imagine a species of which most individuals cannot reach maturity during a normal year; their number decreases from year to year, until eventually one of the rare very warm summers makes it possible for all the individuals to complete development. Now the size of the popUlation leaps suddenly from very small to very large, so that the species can persist during the following normal years. We shall consider such an example in more detail on pp.

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