BIO152H5 Lecture Notes - Lecture 16: Instinct, Spider Web, Fixed Action Pattern
Document Summary
Natural selection acts on behaviour ( how they eat, how they reproduce, how they avoid prey, how they forage) Proximate: what mechanisms elicits the behaviour and what physiological mechanisms mediate the response, how : mechanisms of the behaviour. Ultimate: why has the animal evolved that behaviour or why does the behaviour occur in the. Example: spider web - > flee from predator. What is the adaptive significance of innate behaviour: situations where learning is not possible, situations that have a high impact on fitness and demand, a reflex-like,fast,unlearned. The trigger for the behaviour is a sign stimulus: example 2 : robins ( bird) with orange feathers area attacked. It changes the behaviour of the recipient in between species or in between the same species. Modes: diurnal: visual, nocturnal: sound, scent, visual, chemical, tactile and auditory. Forms: visual, chemical, tactile and auditory. Chemical : pheromones trigger courtship behaviour in fruitflies.
