blah Flashcards
(111 cards)
what is ethology
the scientific and objective study of animal behaviour under natural conditions
what is behaviourism
study of the influence of external stimuli on behaviour
observable and quantifiable stimuli and response
what are tinebergen 4 questions
what is it for
how did it evolve in the history of the species
how does it work
how did it develop in the animal
why is group selection flawed
assumes differential survival of populations not individuals
populations is regulated by social behaviours which role is to benefit the group
evolutionary unstable
what i anthropomorphism
giving a human quality/behaviour to something
what is ad libitum sampling
record in or group behaviour with no reference to well defined methods
good for initial observation and question formation
focal animal sampling
obs one animal record wither all behaviours or all occurence of one behaviour in set time
reproducible
all occurences sampling
record whether did did not occur in ind or group in set time
loss of lot of info
scan sampling
record instantaneous activity or behaviour
state of all animals in group at pre determined time interval
what does superb bird of paradise show
sexual selection (visual/sound)
what does sexual selection favour when there is variance in male fitness
evolution of alternative male mating tactics
types of sexual selection
pre copulatory - intrasexual
intersexual
post copulatory -cryptic male choice
sperm competition
what increases male fitness (Drosophila)
increase number of mates
what increase female fitnesss dros
no of mates doesnt = allow choosiness
what sexual selection do elephant seals show
intrasexual - male fight for social dominance so can mate more
what can male male competition lead to
amplification of characters
secondary sexual characters/dimorphism
example of intersexual selection
female choice - get gifts from male
what scoripion fly and example of and explain
intersexual sel
male give female a fly, perhaps to preove theri quality?
evidence that larger prey given=longer copulation=more sperm transfer
what are the two hypothesis for evolution of female choice
- sexy son hypo, male chose female based on producing sone which will have the best chance of reproducing
- zahavis handicap principle, female choose male as he able to survive with costly trait
what is widow tailed bird and example of
runaway sexual selection - cut off experiment etc
found that did have cost to condition
example of ways males deal with sperm competition
- mate guarding eg blue milkweed beetle
- removal of sperm during mating eg odonata comple male genital remove rival spem and then guard
- testes size eg northern giant lemur testes 5.5% body volume but not found to be relation to amount of sperm ejaculated
- sperm number, strategically allocate in a way to make max reproductive success eg red jungle fowl, male ejeculate more when see another male has, but when multiple males have do less. also increase amount of sperm with new female
descirbe an example of cryptic female choice
female use physical or chemical mechanism to control a males success in inseminating her eggs eg eject more spem when a subordinate male
regulate egg laying
what is bluegill sunfish an eg of
sneaker male, sneak into territory and steal fertilisation
look like females as gen polymorph, also mature more quickly than parental male
also seen in plainfish midshipman
when there is a lot of female in soay sheep what happens to sexual selection
less selection for bodysize and horns as males are unable to use these traits to control access to females