28 agosto 2016

maré vazante, viveiros ria Aveiro

Not long ago, researchers for the first time connected oxytocin with why some animals are naturally monogamous and others are not. Only about 3 percent of nonhuman mammals form monogamous bonds; the majority mate with many different partners. Some species of prairie voles form long-lasting pair-bonds (sometimes for life). They share nests, avoid meeting other potential mates, and rear their offspring together. Closely related to the monogamous prairie voles are the montane voles, which display a very different mating style. They do not form pair-bonds, and the males are uninterested and uninvolved in parental care. Female montane voles are not exactly devoted parents either-they abandon their of spring shortly after birth.
Given that these two species of voles share 99 percent of the same genes, making them very genetically similar, why do they behave so differently? As it turns out, the voles differ greatly in how they produce and process oxytocin and vasopressin. The attachment-prone, faithful prairie voles have a lot more of these bonding hormones and have a denser supply of receptors in the brain that can detect and use them.
Why women have sex - Cindy M. Meston

Sem comentários:

Enviar um comentário