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Latest Sexual selection Stories

Study Shows Impact Of Polyandry On Reproductive Success In Fire Salamanders
2013-12-02 16:11:27

University of Bielefeld Researchers at Bielefeld University and the Technische Universität Braunschweig are the first to confirm the benefit of multiple paternities for a vertebrate under completely natural conditions. Together with their team, Dr. Barbara Caspers and Dr. Sebastian Steinfartz have shown that female fire salamanders mate with several males under natural conditions (so-called polyandry). This grants them fitness-relevant benefits by increasing their number of offspring. The...

Male Lizards Steer Clear Of Females With Similar Throat Bands
2013-11-07 06:11:53

April Flowers for redOrbit.com - Your Universe Online A team of researchers from Penn State University recently examined the relationship between body-color patterning and mating behavior in fence lizards, Sceloporus undulatus, which are found ranging across the Eastern US. Tracy Langkilde, an associate professor of biology at Penn State University, and Lindsey Swierk, a graduate student in Langkilde’s lab, found that the sex lives of these lizards are more complicated than you might...

Better Sex In Return For Nuptial Gifts
2013-10-24 13:41:15

[ Watch The Video: Male Spider Presents Gift Before Sex] Aarhus University A male spider that gives its selected female a nuptial gift is allowed to mate with her for a longer period of time and provide more sperm than a male that fails to come with a gift. If a male spider goes to the trouble of finding a good gift, wraps it up nicely in spider silk and offers it to a female he would like to mate, he has far better chances of fathering her offspring than if he skipped the present....

Role Of Sperm Competition In Formation Of New Species Confirmed By Biologists
2013-09-27 08:09:16

Syracuse University 'Current Biology' article marks culmination of 6 years of research Female promiscuity—something that occurs in a majority of species, including humans—results in the ejaculates from two or more males overlapping within her reproductive tract. When this happens, sperm compete for fertilization of the female's eggs. In addition, the female has the opportunity to bias fertilization of her eggs in favor of one male's sperm over others. These processes,...

2013-09-19 13:14:21

It is common for parents to influence mate choice — from arranged marriages to more subtle forms of persuasion — but they often disagree with their children about what makes a suitable partner. A new study has found an evolutionary explanation for why some parents try to control who their children pair up with. The study, involving a University of Bristol researcher and published today in the journal Evolution & Human Behavior, shows that this conflict over mate choice may be...

2013-08-16 10:09:08

The essence of male beauty is down to the way males use their genes rather than what genes they have, according to a new study into the sexual attractiveness of turkeys. Geneticists have long puzzled over why individuals of the same sex show a greater or lesser degree of sexual attractiveness. In other words - why are some people better looking than others when they're genetically similar? In a new study, published today in the journal PLoS Genetics, scientists turned to male wild...

Sexuality Bonobo Female Dominance
2013-07-16 08:36:25

April Flowers for redOrbit.com - Your Universe Online Among mammalian species, female social dominance is rare. However, one of our closest living relatives, bonobos, are known for the relatively high statuses females hold in social groups. This puzzles researchers as the males are often bigger and stronger than the females. A new study from the Max Planck Institute for Evolutionary Anthropology has analyzed the dominance relations between male and female wild bonobos, taking particular...

2013-07-10 10:34:21

Some people possess a small number of cells in their bodies that are not genetically their own; this condition is known as microchimerism. It is difficult to determine potential health effects from this condition because of humans’ relatively long life-spans. Now, researchers at the University of Missouri have found that microchimerism can be found in dogs as well. Jeffrey Bryan, an associate professor of oncology at the MU College of Veterinary Medicine and director of...

2013-06-11 11:12:09

Females play a larger role in determining paternity than previously thought, say biologists in Syracuse University's College of Arts and Sciences. Their findings are the subject of a new paper titled "Female mediation of competitive fertilization success in Drosophila melanogaster," published this month by Proceedings of the National Academy of Sciences of the United States of America. Stefan Lüpold, a research assistant professor in the college's Department of Biology and...

Chin Preference Changes Across Several Populations
2013-04-15 18:51:55

Lee Rannals for redOrbit.com — Your Universe Online A new study published in PLOS One suggests facial preferences across different populations vary. Northwestern University researchers tested the assumption that the presence of chin shape in picking a mate is consistent across human populations. However, they found when tested, this theory didn't hold true. "This suggests that either sexual selection hasn't been important in shaping chin shape in humans or that facial...


Word of the Day
barghest
  • A goblin in English folklore, often appearing in the shape of a large dog and believed to portend imminent death or misfortune.
  • A ghost, wraith, hobgoblin, elf, or spirit.
The origin of 'barghest' is not known, but it may be from perhaps burh-ghest, town-ghost, or German Berg-geist (mountain spirit) or Bär-geist (bear-spirit).
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