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By S. Charles Kendeigh

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Example text

In order to live in a particular habitat, an organism must be morphologically adapted to it. This may be accomplished to a certain extent during growth, especially in sessile forms, but depends tat, of an The and those factors its in their limits of toler- in their surroundings that are most immediately unfavorable limit their habitat distribution. In order for an organism to take advantage of its morphological and physiological adjustments, it must have the proper behavior responses. These inherited and acquired action patterns involve selective stimuli.

Inisms, the dominants and ])redominants (Shelford 1932). Subdominants and member species, however, are not usually dedominant species directly rather, on the environmental conditions that the dominants establish. DifTerent sjjecies of dominants in adjacent or related communities may react on the environment jjendent on the The gradient in space may be the arctic zones of a continent. density of each species is The population distributed in a form re- : in a manner so nearly the same that subordinate spefind suitable conditions for existence in each, although they are usually more characteristic of one than the other.

6. Parasites, diseases. 7. Reproductive potential, mortality, rate of population turnover. Requirements for reproduction 8. : home range, territory, nest-site, nesting materials, etc. Breeding behavior 9. Development 10. : mating, nesting, etc. of offspring: rate, stages, gen- erations per year, etc. so forth. Useful outlines, methods, and bibliographies for life history studies of different kinds of animals and plants have been published in the scientific periodical Ecology since October, 1949.

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