CHDV 23249 Chapter Notes - Chapter 1: Sex Steroid
1 Feb 2017
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Document Summary
Orange throat: aggressive and defend large territories with many females, higher levels of plasma testosterone than other lizards, endurance, activity, home range size, but have lower survival rates than other lizards. Blue throat: males defend smaller territory with fewer females. Elevating plasma t in yellow/blue throats increased endurance , activity, home range. Behavioral morphs linked to effects of gonadal steroids (like testosterone) One study found that elevated plasma t in hatching lizards caused them to develop into aggressive territorial morphs at higher frequencies. Steroids have activational effects that manifest at maturity. activational effects later trigger changes in behavior and physiology in adults. Survival/reproduction of males is associated with changes during maturation. Gonadal steroids: changes in levels of aggression changes in morphology and physiology (muscle development) This paper investigates acting activational effects arising from variation in levels of plasma t. Throat color appears when lizards start to mature. throat color has genetic basis.
