BIO202H5 Lecture Notes - Lecture 9: Euprymna Scolopes, Ecdysone, Enzyme Inhibitor
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Mutualistic relationship with bacteria (bacteria colonize specialized organs in the squid, while the predatory squid can blend in with the environment and thus improve camouflage when catching prey) Metabolic processes in bacteria allow the squid to be camouflaged in its environment. If juvenile hormone levels are low: larva/pupa adult. Juvenile hormone triggers what stage of life the insect is in. Threshold levels of juvenile hor(cid:373)o(cid:374)e; (cid:449)he(cid:374) it"s i(cid:374) the (cid:373)iddle (cid:455)ou"re goi(cid:374)g from larva to pupa, a(cid:374)d if it"s reall(cid:455) lo(cid:449) (cid:455)ou"re goi(cid:374)g fro(cid:373) pupa to adult. Bombyxin stimulates release of steroids: has a positive feedback system on ecdysone (it encourages moulting) ensures that the animal grows enough between each moulting stage. Myosupression inhibits ecdysone to prolong larval stage. Temperature changes (cyclicity of season changes: moisture of the environment and ion content. Many animals make long journeys in order to follow warm temperature trends. When salmon are first born in water they are called parr.
