By F. S. Bodenheimer (auth.)
Read Online or Download Animal Ecology To-Day PDF
Best nature & ecology books
During this interesting autobiography from the major genius of twentieth-century physics, Max Planck tells the tale of his existence, his goals, and his pondering. released posthumously, the papers during this quantity have been written for the final reader and make available his clinical theories in addition to his philosophical beliefs, together with his techniques on ethics and morals.
- Air: The Restless Shaper of the World
- Disease Emergence and Resurgence : the wildlife-human connection
- The Art of Science
- How Ten Guys Saved Countless Dogs and Cats, Twelve Horses, Five Pigs, One Duck,and a Few Turtles
Additional resources for Animal Ecology To-Day
The great majority of the first generation, which matured in April, estivates. Oviposition and activity is resumed in the autumn (late September), and the beetles die soon afterwards. The second generation develops from their eggs in October. Some of these adults oviposit, forming a IA generation. A small proportion only of the eggs of this IA generation develops successfully into beetles which lay very few eggs during the winter. These eggs do not develop. The few survivors participate in the formation of the normal first generation.
30 In comparing now the theoretically possible types of life-curves of PEARL 6 , we realize that all these types are only realizations of ecological life-tables, which have no connexion with inborn physiological life-curves. The real type of inborn physiological longevity is represented by the starving Drosophila flies in Fig. 2, in which the previous development stages are added as a line running closely parallel to the 100% living line until the adult stage is reached. All these possible types of PEARL are realized in ecological life-tables, types 4 and 3 being the most common, type 1 being a rather unusual exception induced by catastrophic changes in the environment.
In a sequence of generations: Generation 1 2 3 4 5 6 No. 1 the transition from the first to the second generation brings about the decisive increase. The absolute population abundance veils this fact very often. Anyhow, only the weather at the decisive periods of increase and not at the population peak should be regarded as optimal. Where only one to two annual generations occur, observations should be made for a series of years. But instead of the epidemiological approach we may choose also a zoogeographical analysis.
Animal Ecology To-Day by F. S. Bodenheimer (auth.)