By Randy J. Nelson (Author), Gregory E. Demas (Author), Sabra L. Klein (Author), Lance J. Kriegsfeld (A
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Additional resources for Seasonal Patterns of Stress, Immune Function, and Disease
Sample text
Reproductive function in California voles exposed to different environmental factors. Mean (±SEM) paired testes size of California voles (Microtus californicus) in long (LD 14:10) or short (LD 10:14) photoperiods. Voles that received fresh spinach thrice weekly are noted by the “+” designation. Note that testes size (and function) was reduced in short days, but that exposure to greens prevented the short-day gonadal regression. Restricted access to water in either photoperiod suppressed testes mass.
These observations, along with its avid uptake of melatonin, make it tempting to speculate that the pars tuberalis may be an important component of the photoperiodic mechanism. A number of recent studies have indicated that melatonin binding sites are also located on cells of the immune system. These findings will be described in detail in Chapter 5. 1. Reproductive Morphs The extent to which photoperiod is a useful proximate factor depends on the year-to-year predictability of favorable environmental conditions; photoperiod is less useful as a cue for reproductive activity for animals living in irregularly changing habitats.
The results indicated that, on average, water-restricted deer mice reduced the size and function of their reproductive systems relative to animals provided with water ad libitum. Fertility was severely limited in water-restricted male deer mice as compared to animals receiving ad libitum water. A wide distribution of reproductive responses to restricted water intake was evident, and mice were rank-ordered by epididymal sperm numbers. Individuals of two classes, those in the top quartile of epididymal sperm numbers and those in the bottom quartile of epididymal sperm numbers, were further compared to detect associated physiological variables in response to water restriction.