14 - Honey Bee Behavior age social environment(eg ethyl...

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Honey Bee Behavior age + social environment (eg ethyl oleate from foragers) → juvenile hormone (regulate/ communicating information about intrinsic and extrinsic state of individual to the brain and genes) hypothalmus – pituitary-gonadal (HPG) axis → t acts on brain; gonads – T; pituitary: LH (increased daylength) Testosterone & Aggression - increasing daylight - can raise testosterone in lab by altering light cycle - can cause testosterone levels to increase BUT: - in wild T does go up in the middle of breeding season, but doesn't stay high after even though day length is still long - T levels in lab are lower than in wild (don't rise as much as in males in the wild) so, day length – not the whole story what other things may increase T levels? Spring: more social interactions; different social interactions - social stimuli? (blob on slide – territory of male) - pick experimental male and then give him a testosterone implant → becomes more active and aggressive, singing more at territory boundaries - prediction: surrounding males experience T increase as well; and further away from territory less or no T elevation - true! T only loosely associated with breeding and aggression graphs: - lots of variation between species why does it drop? - Perhaps monogamous birds – need to make babies! (can't be hyperaggressive) -
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