lecture 2 Flashcards
what are the feature detections used in frogs
frequency and amplitude to recognize own species
loud and dangerous calls = fit males
low frequency = large male
mechanoreceptors in ears to trigger AP for female behaviour
what do hormones trigger in songbirds
hearing other songs, males get aggressive, females prepare to breed
lizards experiment
what is an example of artificial selection
breeding foxes for shorter flight distances, 10 years later we see dogs
adrenaline linked to melatonin
what are the role of genes in sitters and rovers
sitters, sits on food for less crowded areas
rovers, roam for food in crowded areas
parasite 1 targets sitters to lay eggs in them then explode in the host, rovers favoured
parasite 2 lay eggs but sitters can capsulate them and rovers cannot
what are the two factors to habitat selection
competition and resource availability
what is dispersal and migration
dispersal, one time movement
migration, moving from and back home
what is the competition hypothesis
leaving home because where you are born there is more competition
inbreeding avoidance hypothesis
males leave before females to prevent inbreeding depression
mate competition hypothesis
compete with same sex for the opposite sex until you get a mate
lions and male-male competition
win-stay lose shift hypothesis
depends on others on the success of reproduction
kittiwakes (bird)
what are the tools used for orientation
sun compass, star compass, geomagnetic compass
what is the biological clock
body proteins and hormones produced on cycles
what are the time cycles
annual, circadian, lunar
how do monarchs orient
sun compass, used polarized light to clock shift them and they will be disoriented
how do pigeons navigate
successful: magnet on head but sun is out, sun is cloudy with no magnet, navigate when they are blind, clock shift them when it is cloudy
unsuccessful: glue magnet to head and on cloudy day, clock shift when the sun is out
