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In nature, multiple waves of exposure to the same parasite are likely, making it important to understand how initial exposure or infection affects subsequent host infections, including the underlying physiological pathways involved. We tested whether experimental exposure to trematodes (Echinostoma trivolvis or Ribeiroia ondatrae) affected the stress hormone corticosterone (known to influence immunocompetence)...
Life history theory seeks answers to questions about how suites of traits, like growth rate, body mass and survival, have coevolved to maximize the fitness of individuals. In stochastic environments, individual fitness may be closely linked to environmental conditions experienced early in life. When conditions deteriorate, animals have to adapt physiologically to avoid detrimental effects to growth...
Glucocorticoids administered during development can have lasting consequences on learning performance and brain development. Whereas most studies administer glucocorticoids to the young rat during the so-called stress-hyporesponsiveness period (SHRP), we examined the effects of corticosterone pellets implanted at the conclusion of the SHRP on two forms of eye blink conditioning (EBC). Analysis of...
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