The Texas horned lizard (Phrynosoma cornutum) is protected in several states due to its
apparently declining numbers; information on its physiology is therefore of interest from both …

Seasonal fluctuation in serum concentrations of sex steroid (testosterone [T] and 17β‐
estradiol [E2]) and thyroid (triiodothyronine [T3] and thyroxine [T4]) hormones was …

Acute glucocorticoid elevations can be adaptations to short-term stressors. The breeding
season hypothesis predicts reduced glucocorticoid responsiveness to acute stressors in …

An attenuated stress response during the breeding season has been reported for several
vertebrate species, but the underlying physiological mechanism has received little attention …

We describe the reproductive cycle of Northern Pacific rattlesnakes (Crotalus oreganus) by
quantifying steroid hormone concentrations and observing reproductive behaviors in free …

Reproduction is regulated by multiple factors that influence physiology and behavior to
ensure the continuity of species. However, more work is needed to examine the complex …

Progesterone, 17-hydroxyprogesterone, androstenedione, 5α-dihydrotestosterone,
dehydroepiandrosterone, testosterone and oestradiol concentrations in the plasma were …

The relationship between plasma CORT concentration and reproductive state was
investigated in New Zealand's common gecko, Hoplodactylus maculatus. This primarily …

Understanding the proximate mechanism for seasonal modulation of the adrenocortical
stress response is an important step in determining the evolutionary significance of such …

Assessment of reproductive status in animals generally depends on monitoring hormone
concentrations in plasma, but blood sampling often involves significant stress to the subject …