How does polygyny threshold model work?
The polygyny threshold model is an explanation of polygyny, the mating of one male of a species with more than one female. The model shows how females may gain a higher level of biological fitness by mating with a male who already has a mate.
What is female defense polygyny?
Resource defense polygyny occurs when males control females indirectly by defending territories or resources against conspecific males, whereas female defense polygyny occurs when males control females directly by defending them against conspecifics males.
What is it called when there is one male and lots of females that he might be able to mate with?
From Wikipedia, the free encyclopedia. Polygynandry is a mating system in which both males and females have multiple mating partners during a breeding season.
Under what conditions might natural selection favor the evolution of polygyny?
The polygyny threshold model states that if costs incurred are less than the benefits gained from mating polygynously in terms of breeding-situation quality, then polygyny is favored and could evolve.
What is the difference between Intrasexual and intersexual selection?
In intersexual selection, one sex, typically the males, will display a certain trait or behavior with the goal of attracting and mating with the opposite sex. Intrasexual selection, on the other hand, occurs between members of the same sex. For example, male sea lions compete for dominance over rookeries of females.
What is intersexual selection example?
Intersexual. Intersexual selection deals with members of the opposite sex within a given species. An example of this could be the bright colors of male birds. If one male had brighter colors, it would give him an advantage over other males of the same species for mating purposes.
Why is mate selection important?
Mate choice is an important evolutionary process that contributes to selection for a vast array of traits in all manner of color, shape, size, sound, and smell ( Andersson 1994 ).
What is the polygyny threshold?
The difference between these two intersection points, labeled PT, is the polygyny threshold. It is the gain of environmental quality for the female when she chooses the bigamous relationship and thus the minimum environmental quality difference necessary to make bigamy beneficial for the female.
What is the polygyny hypothesis?
This refers to the hypothesis that the practice of polygyny, where multiple females choose to mate with a single male, is the result of the desire to achieve access to resources held by dominant males. Accordingly, societies in which resources are concentrated in the hands of a few males should witness more polygyny.
What is the cost of polygyny?
According to William A. Searcy and Ken Yasukawa, the term cost of polygyny is defined as the net costs of polygyny after the summation of all of the component costs and benefits. Costs include less parental care and increased competition between females for the male’s provision and food among other resources.
Is the Neolamprologus pulcher polygynous?
Orians predicted that animals exhibiting resource defence polygyny, such as the fish Neolamprologus pulcher would fit to this model when living in successive habitats, where territory quality is very variable. Using the territory quality to decide whether to pursue a monogamous or polygynous mating relationship.
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