Chapter Eleven: Mating Systems Flashcards

1
Q

mating systems represent males and females trying to ___

A

maximize their parental investment

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2
Q

males pay a ___, females pay a ___

A

mating cost
fertility cost

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3
Q

one male mating with one female for a reproductive cycle or for life

A

monogamy

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4
Q

more than one mate at a time

A

polygamy

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5
Q

one male mates with multiple females

A

polygyny

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6
Q

one female mates with multiple males

A

polyandry

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7
Q

multiple mates for everyone, “explosive breeding event”

A

promiscuity

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8
Q

what is the most common mating system

A

polygyny

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9
Q

three influences on mating systems

A
  1. ecological factors
  2. parental care or other assistance requirement
  3. female-enforced systems
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10
Q

open areas are more likely to have ____ mating system

A

polygamy

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11
Q

dense forests are more likely to have ____ mating system

A

monogamy

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12
Q

if both parents are needed to care for the young, ___ would be beneficial

A

monogamy

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13
Q

in a female-enforced system, the female forces ___ on male

A

monogamy

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14
Q

monogamy is ___, especially in mammals

A

rare

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15
Q

why is monogamy rare in mammals

A

female has to stay around to nurse the offspring, she physically can’t leave them, but the male can easily leave and mate with someone else

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16
Q

5 cases in which monogamy is beneficial

A
  1. mate assistance theory
  2. if the female remains receptive to other mates
  3. female enforced monogamy
  4. synchronized breeding
  5. when it is difficult to find another mate
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17
Q

the mate assistance theory states that ____

A

monogamy is beneficial because the raising the young requires assistance, female can’t do it on her own

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18
Q

seahorses are monogamous for life, the males ___ while the female ____

A

care for young
recovers quickly and can have more babies sooner

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19
Q

the hornbill nests in tree cavities that they close off, have to be monogamous because ____

A

male has to bring the enclosed female meals

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20
Q

burying beetle males try to attract other females to a nest, but the original female will _____
this is an example of ____

A

knock him off his perch
female-enforced monogamy

21
Q

when all females breed within a few days of each other

A

synchronized breeding

22
Q

synchronized breed occurs in ___ and leads to ____

A

large communal groups
monogamy

23
Q

why does synchronized breeding lead to monogamy

A

by the time the male has mated with one female, all the other females have also mated so there are no more available females

24
Q

eagles have a very low ___, so monogamy makes sense

A

population density

25
what does extra pair copulations mean
cheating on your monogamous partner
26
social monogamy is not always _____
genetic monogamy
27
benefit of extra pair copulations for males
more offspring
28
3 hypothesis of the genetic benefit of extra pair copulations for females
1. fertility insurance hypothesis 2. good genes hypothesis 3. genetic compatibility hypothesis
29
what does the fertility insurance hypothesis state
mating with several males reduces the risk that some of her eggs will remain unfertilized
30
what does the good genes hypothesis state
her social partner is of less genetic quality than other males, so she will mate with other males to improve offspring viability
31
what does the genetic compatibility hypothesis state
mating with several males increases the genetic variety of the sperm available to the female, so it increases the chance that some sperm will have DNA that is an especially good match with the DNA of her eggs
32
4 hypothesis of the material benefit of extra pair copulations for females
1. more resource hypothesis 2. more care hypothesis 3. better protection hypothesis 4. infanticide reduction hypothesis
33
polygyny is related to the ____
distribution of females
34
males fight with other males for females
female defense polygyny
35
female defense polygyny is seen where ____
females congregate for reasons unrelated to reproduction
36
male defends territories and female chooses a male based on the quality of his territory
resource defense polygyny
37
the polygyny threshold model states that there is a resource level where its better to be a ____ than a ____
second female in a good territory first female in a bad territory
38
simply finding a female first, not territorial, no dominance hierarchy
scramble-competition polygyny
39
in scramble-competition polygyny, the males with the best ____ mate the most
tracking skills
40
males guard a symbolic territory or display that attracts females
lek polygyny
41
a small, symbolic territory that attracts females for mating
lek
42
in lek polygyny, ___ do the majority of the mating
a few of the best males
43
three hypothesis for the benefits of leks to males
1. hotspot hypothesis 2. hotshot hypothesis 3. female preference hypothesis
44
the hotspot hypothesis states that
the lek is a place where females frequent
45
the hotshot hypothesis states that
inferior males will be near the superior male and get the overflow copulations
46
the female preference hypothesis states that
males assemble because females prefer sites with many males rather than just a few
47
polyandry is ___
rare
48
polyandry occurs when there are ___
more males breeding than females
49
two selective pressures of polyandry
nest sites are limited potential for heavy losses of eggs or clutch size limitations