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LECTURE_7-1 - behavioral reproductive and physiological...

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LECTURE 7 INTRODUCTION TO PROXIMATE MECHANISMS Introduction to trade-offs Name the many things birds do in their lives: What systems are involved in controlling these behaviors and where the energy is allocated? What are the physiological sources of energy? We’ve discussed behavioral trade-offs (e.g. mating effort vs. parental effort), but there are underlying physiological trade-offs that control these. Trade-off = an exchange for one thing in return for another Overall, environmental influence stimulate physiological trade-offs, which stimulate behavioral trade-offs, which then lead to a behavioral output. The physicological trade-offs represent constraints BASIC DEFINITIONS Life history – the overall picture of an organism’s life, including physiological,
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Unformatted text preview: behavioral, reproductive, and physiological characteristics Constraint – factor preventing full expression of a physiological or behavioral trait E.g. broiler size Every bird has an energy budget. This energy budget must be controlled physiologically, which is largely accomplished by the endocrine system. Endocrine – secretion of a gland that is transmitted by blood (in contrast to exocrine, secreted to the outside – sweat glands) WHAT ARE THE MAJOR ENDOCRINE GLANDS? We can see how endocrine processes drive various behaviors: Reproductive hormones control reproductive behaviors Stress hormones control fight or flight responses Thyroid hormones control metabolism and food intake Many hormones adjust immune function...
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