3/30 Sexual Selection And Mating Systems Flashcards Preview

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Flashcards in 3/30 Sexual Selection And Mating Systems Deck (20):
1

mating systems

monogamy, polygamy, promiscuity/polygyandry

2

monogamy

1 m/ 1f, long term pair bond, serial monogramy

3

serial monogamy

short relationship just to reproduce

4

polygamy

polygyny, polyandry

5

polygyny

1 m, many F- m increase reproductive success

6

polyandry

1 F, many M - rarer

7

what factors favor monogamy

harsher environment, limited resources, small population size, less available mates, mates harder to find, f sexually receptive for short time, f spatially dispersed, impossible for M ot monopolize F, F can enforce monogamy, M care needed for offspring survival

M reproductive sucess, predators

8

wandering abatross

biparental care needed, need to keep egg warm

9

black vultures

mate for life, unpredictable food source- family roost- share info with related individuals- help kin increase reprdocutive success, signle didnividual unable to raise offspring alone

10

anglerfish photocyrounus spiniceps

two indivudal become one, lures other fish in, extreme monogamy, M glues self to F

11

what factors favor polygyn

ersourceful environment, non harsh conditions, large dense population, guarding of F possible, M control access to resources, F unable to enforce monogamy, great differences among M in terms of quality- resources, genetic quality

12

why would f accept polygyny

high quality males v loser males

13

red black bird

resources, nest sites, multiple F chose 1 m

14

blue gills

location of rock nest

15

lions

prides, kill young

16

factors favoring polyandry

F can abandon parental care to M and mate w.other M rare in humans== red necked ducks, icanans, internal gestation

17

why would F mate with multiple M

she run out of sperm, mate is sterile, mate has LQ genes, m has incompatible genes, maximize genetic diversity among offspring- reshuffle, encourage sperm competition, confuse paternity

18

spotted sandpiper

seasonal environment - lots of reosurces

19

promiscuity and polyandry

polgynandry- Europeans badgers- smaller groups, individual form small groups- everyone mates with everyone- diffuses paterneity

20

percent extra pair fertilizations vs species

some speicies look monogamous- both parental care, tree swallows 50% offspring

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