Nemoclay

Hi everyone !

I would like to know why the sexual dimorphism is reduced when the species are monogamous and important when the species are polygamous ?

Many thanks in advance

Ps: It's not a homework question but a in case of question exam

I realize the anser was on wikipedia after reading carefully... Sorry for the disturbance and for the people interested by the answer:

A frequently studied type of sexual dimorphism is body size. Males typically have larger bodies than females. In some species, however, females have larger bodies than males. Sexual dimorphism in body size has been linked to mating behavior. In polygynous species, males compete for control over sexual access to females. Large males have an advantage in the competition for access to females, and they consequently pass their genes along to a greater number of offspring. This eventually leads to large differences in body size between females and males. Polygynous males are often 1.5 to 2.0 times larger in size than females. In monogamous species, on the other hand, females and males have more equal access to mates, so there is little or no sexual dimorphism in body size.

Ok thanks for your responses

Hi everyone,

I was reading a paper, and I found the term "assortative mating". It's a synonym of homogamy or there is a difference between these terms ?

Thanks in advance for your help

It's okay I find the answer !

You can delete the topic if you want !

Is this a homework question?

No, I'm watching exam's annals and this question was asked in the past. And I don't find really good elements of response..

Ps: Sorry if there are some grammatical mistakes, english is not my mother tongue.

Hi,

I would like to know why the evolutionarily stable strategy concept is important in behavioral ecology ?

Thank you for your help

Thanks for the link

Hi,

What are the differences and the common points between the founder effect and population bottleneck ?

Can we consider the founder effect as a particular case of a population bottleneck ?

Hi !

I would like to know how you can reveal a wahlund effect, how you can confirm it.

Thank in advance for your help
Vincent

The males represent dead-ends for the organelles genes. Because of this fact these genes have evolved a number of mechanisms to increase the production of female descendants, male killing, male sterility (like the chadn's example).