CAB chapter 10
since males fitness depends on the number of females he can mate with, why would some males become monogamous?
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polyandry is believed to have evolved in sandpipers due to which features of their ecology?
ALL
Plains zebra females live in relatively lush grasslands. They form groups because they can feed longer and defend against predators when they are in a group. In contrast grevy's zebra live in more arid areas and have to wander long distances to find food and water. Males will defend a territory around a resource such as water. What system is shown by Plains zebra and what system by grevy's zebra?
Female defense polygyny; Resource defense polygyny
females of a species of fly form swarms in which several dozen individuals gathered together to fly about in circles. When a male enters the swarm, females inflate their abdomens and move toward the male, who carefully selects one of the many females as his partner. What is there about this species that constitutes a Darwinian puzzle?
The fact that females have to persuade apparently choosing males to mate with them
Females of the species of fly worm swarms in which several dozen individuals gather together to fly about in circles. When a male enters the swarm, females inflate their abdomens and move toward the male, who carefully selects one of the many females as his partner. Which is an example of a group selectionist puzzle?
The fact that many females have to wait for a mate, which reduces their reproductive potential of the species
kirk's dik-dik is a small African antelope that usually forms male female pairs. If DNA data were collected from the offspring of intact pairs, it should be found that the offspring of the females were sired by their social partners.
This is an example of a prediction
kirk's dik-dik is a small African antelope they usually forms male female parts . It may be that if males were experimentally removed from pairs, females would wander from their territories into the territories of other males.
This is an example of a prediction
Elephant seal males engage in battles to determine who will be the beachmaster and have access to females on the beach. The beachmaster will chase also Bachelor males, who will try to force copulations with the females as they come ashore. As a reward for the hard work comma the beachmaster will father about 80% of the pups born in the next season.
This is an example of female defense polygyny
a pride of African Lions consists of a group of related females, as well as a single male or a small group who often related to each other but not the females. The females engage in cooperative behaviors, such as hunting. Group living allows defense of good hunting territory and Cubs.
This is an example of female defense polygyny
Male California mice remain with their female while she gives birth to offspring that he has fathered.
This is an example of monogamy
Jacana females defend territories that include several males incubating eggs she has laid in their nest. The female is larger and more aggressive then the male.
This is an example of sex role reversal polyandry
Kirk's dik dik is a small African antelope that usually forms male-female pairs. The males placed their scent marks over those of the female, which hides the signals of sexual receptivity that females produce when they are fertile.
This is an example of test evidence
Red deer males compete to control access to an entire herd of those , meaning that a single male will mate with multiple females, while other males have 0 fitness.
This species exhibits female defensive polygyny
if you study a pair of European Beavers, you will find they are all of the young in their colony are genetic offspring of the pair.
This species exhibits monogamy
Male ostriches guard a nest into which a female lays an egg from their meeting. The next day she mates with a different male; the first male also mates with a different female,which places her egg in his nest.
This species exhibits polygynandry
What benefit is there to a female to engage in extra-pair copulations?
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What hypotheses has been proposed to explain why males congregate in leks?
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Genetic monogamy is...
extremely rare
when resources are evenly distributed in space but females form groups to better access those resources or to reduce the risks of predation, we are likely to observe
female defense polygyny
Distribution of females in the environment tends to favor monogamy when...
female density is low and there is broad dispersion of females
When resources are distributed heterogeneously and females are widespread, males will seek out
females scramble competition polygyny
sexual selection differs from natural selection in that natural selection effects a broader spectrum of traits than sexual selection, which acts only on...
individual differences in the ability to gain access to mates
When resources are distributed heterogeneously and females are widespread and do not form groups, we are likely to observe that males wait for females to come to them:
lek polygyny
when resources are clumped, attract females comma and are easily defended are likely to observe...
resource defense polygyny
Studies in which monogamist females of a species of bird snow buntings were experimentally widowed revealed that...
the success rate of widowed birds was lower than the success rate of intact pairs
Kirk's dik-dik is a small African antelope that usually forms male-female pairs. It is also possible that pairs form in order to protect their offspring, with two adults doing a better job of protection than just one.
this is an example of a hypothesis
Kirk's dik-dik is a small African antelope that usually forms male female pairs. It is possible that monogamy involved in this species because males are attempting to guard their partners from other males?
this is an example of a hypothesis
