24Devel06x

24Devel06x - Developmental effects on behav. Cos' we all,...

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Developmental effects on behav. Cos’ we all, we all are a-changin’
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Ontogeny = change during development, especially before breeding - embryo tissues begin specialising; subsequent dynamic change in sensitivities - mostly genetic, but neural, hormonal, morphological, environmental e.g., premature babies can support own weight; all babies grasp with both feet and hands e.g., natal ability to swim lost
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Environmental e.g., tadpoles reared with predatory dragonflies less active and grow larger & brighter tailfins (makes too big for predators) e.g., tadpoles morph into predatory form as ponds dry up (chemical signals)
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Filial imprinting = offspring fixating on parents - mostly birds & mammals - appearance, odour, vocalisations e.g., goslings and rubber boot patterns - can start before hatch/birth - precise; adaptive value? to ID mothers in crowds but, mistakes: créches (cichlids, waterfowl, . ..) - why more common in birds & mammals?
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Sexual imprinting = offspring fixating on image of future mate - hand-reared jackdaw (Lorenz): “The ♂ … wanted to feed me the choicest delicacies. Remarkably . .., he recognized [my] mouth …, and he was overjoyed if I opened my lips to him,
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24Devel06x - Developmental effects on behav. Cos' we all,...

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