送交者: xj 于 2005-11-16, 12:52:58:
now this study I called fascinating. For those imperfect men, probably it is better to go for old ladies rather than dreaming about the young beauty.
======================
There’s hope for the less-than-perfect male – if you’re a swordtail fish, that is. As the size and age of female swordtail fish increase, so does the preference for males with asymmetrical markings, according to a new Ohio University study.
Molly Morris, associate professor of biological sciences, and colleagues found that older female swordtails spent more time with asymmetrically striped males than symmetrical males when offered a choice. These findings are the first to contradict previous studies showing that females tend to prefer males with symmetrical markings, which in this case are black bars on each side of the body. Scientists have suggested that symmetrical markings are a sign of genetic fitness.