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The General Adaptation Syndrome In Gerbillus, Bridget L. Moore

McCabe Thesis Collection

The General Adaptation Syndrome or the G.A.S. is the term applied to collective responses to physiological stress. It is initiated by any disturbance in the normal balance of the body functions. These responses affect humans, monkeys, and other animals. The three main physiological changes which occur as a result of stress are enlarged adrenals, shrunken lymphatic organs, and bleeding gastrointestinal ulcers. There are also concomitant changes in the hematocrit and the formed elements of blood. In particular, there is usually a decrease in lymphocytes and eosinophils accompanied by the increase in neutrophils and platelets.

Stress is defined as pressure, or …

Modeling Oyster Populations. Iv. Rates Of Mortality, Population Crashes, And Management, E. N. Powell, J. M. Klinck, E. E. Hofmann, S. M. Ray

CCPO Publications

A time-dependent energy-flow model was used to examine how mortality affects oyster populations over the latitudinal gradient from Galveston Bay, Texas, to Chesapeake Bay, Virginia. Simulations using different mortality rates showed that mortality is required for market-site oysters to be a component of the population's size-frequency distribution; otherwise a population of stunted individuals results. As mortality extends into the juvenile sizes, the population's size frequency shifts toward the larger sizes. In many cases adults increase despite a decrease in overall population abundance. Simulations, in which the timing of mortality varied, showed that oyster populations are more susceptible to population declines …