Why are my guppies nipping at each other?
Seeing guppy fish chasing each other isn’t uncommon at all. In fact, it’s normal mating behavior. Usually, you’ll see males chasing female fish all the time as they’re trying to mate. If chasing isn’t accompanied by fin nipping or fighting, it’s part of their normal behavior and you shouldn’t become too alarmed.
What caused these trends in the coloration of the guppies?
As turbidity decreases in the pools Endler collected guppies from, the number of predators decrease and the number of bright colored guppies increases. Therefore, the trends in the coloration of guppies is caused by the turbidity of the water.
What is it called when natural selection favors the average trait?
Stabilizing selection results in a decrease of a population ‘s genetic variance when natural selection favors an average phenotype and selects against extreme variations. In directional selection, a population’s genetic variance shifts toward a new phenotype when exposed to environmental changes.
What type of selection is most common?
stabilizing selection
What is a good example of Intrasexual selection?
Examples of such traits include plumage on birds, the mating calls of frogs, and courtship displays in fish. In contrast, intrasexual selection occurs between members of the same sex. Competition between males is common, as with deer or horned beetles, which fight for dominance and the ability mate with nearby females.
Why are females generally more selective when choosing mates?
Females tend to be the choosier sex when it comes to selecting a mate, partly because males can produce millions of sperm, whereas females’ eggs are few and far between. Thus, females may be more selective because they have more invested in each gamete and in the resulting offspring.
What traits do you think are important in mate selection?
Traits assessed as moderately desirable or important are, for example, courage, elegance, attractiveness, thinness, talent for sports, strength, thriftiness, dominance. The least desirable, or the most undesirable are traits such as conceitedness, selfishness, insecurity, aggressiveness, fearfulness, introversion.
How do humans select mates?
Like their female counterparts, males also use visual information about a potential mate, as well as voice, body shape, and an assortment of other factors in selecting a partner. Research shows that males tend to prefer feminine women’s faces and voices as opposed to women with masculine features in these categories.
Do humans fight for mates?
Responses to mate guarding, specifically female resistance to it, have also been observed in both humans and other animals. Responses to mate guarding by males has not been extensively studied. Resistance to mate guarding has been suggested to provide some benefits to partners who do so.
Do males choose females?
Although, in humans, both males and females are selective in terms of whom they decide to mate with, as is seen in nature, females exhibit even more mate choice selection than males.
Are humans the only animals that mate face to face?
Bonobos and humans are the only primates to typically engage in face-to-face genital sex, although a pair of western gorillas has been photographed in this position.