. Elements of ecology. Ecology. 394 Relations between Species duces a chain of cells in the form of a lasso in which a portion of a nematode, or other soil microorganism, becomes ensnared and which then tightens up sufficiently to kill the victim (Bessey, 1950). Some predators are restricted to one prey species or are dependent upon a small group of food species, whereas others are highly catholic in their tastes, as has already been discussed in Chapter 8. Con- versely, certain prey species are attacked by only one predator, but others may satisfy the appetites of many kinds of diners. The sp
. Elements of ecology. Ecology. 394 Relations between Species duces a chain of cells in the form of a lasso in which a portion of a nematode, or other soil microorganism, becomes ensnared and which then tightens up sufficiently to kill the victim (Bessey, 1950). Some predators are restricted to one prey species or are dependent upon a small group of food species, whereas others are highly catholic in their tastes, as has already been discussed in Chapter 8. Con- versely, certain prey species are attacked by only one predator, but others may satisfy the appetites of many kinds of diners. The special anatomical and physiological adaptations of predator species for securing, devouring, and digesting specific prey species, and the equally elaborate specializations of the prey to avoid detection or to resist capture, have been considered in earlier Photo by B. W. Allied, U. S. Soil Conservation Service Fig. A group of pitcher plants {Sarracenia flava) in swampy land of Louisiana. In some animals only the adults are predatory, whereas the young are parasitic or live wholly upon the yolk supplied in the eggs. In other animals, such as many insects, the larvae do most of the eating, and in certain species the adults do not feed at all. Some predators feed upon the adidt stage of their prey, some on the larvae, some on the eggs, and some on more than one stage. If members of the prey species are killed before they have had a chance to reproduce, the. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Clarke, George L. (George Leonard), 1905-. New York, Wiley
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