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Researchers Discover Cave Insects With Sex-reversed Genitalia
2014-04-18 09:04:10

Cell Press Researchers reporting in the Cell Press journal Current Biology on April 17 have discovered little-known cave insects with rather novel sex lives. The Brazilian insects, which represent four distinct but related species in the genus Neotrogla, are the first example of an animal with sex-reversed genitalia. "Although sex-role reversal has been identified in several different animals, Neotrogla is the only example in which the intromittent organ is also reversed," says Kazunori...

Mammals Choose Sex Of Their Babies To Promote Life
2013-07-11 12:57:38

Lee Rannals for redOrbit.com - Your Universe Online Mammals are able to "choose" the sex of their offspring in order to beat the odds and produce extra grandchildren, according to a study published in the journal PLoS ONE. Researchers analyzed 90 years of breeding records from the San Diego Zoo, helping to prove for the first time what has been a fundamental theory of evolutionary biology. Scientists have theorized before that mammals rely on some unknown physiologic mechanism to...

Competition Of Males Over Females
2012-10-25 12:18:31

An evolutionary engine of genital evolution When a female mates with several males, these will compete over the fertilization her eggs. This is an important evolutionary force that has led to the evolution of a diversity of male sexual organ morphologies. This is revealed in a study of seed beetles published today in the leading scientific journal Current Biology. In higher plants, the influential classification system developed by Carl von Linnaeus relied on the fact that the...

2012-01-30 09:15:58

A new study shows the production of sperm is more biologically taxing than previously thought, and expending energy on it has significant health implications. In research published in PLoS ONE, Dr Damian Dowling of Monash University's School of Biological Sciences and Professor Leigh Simmons of the University of Western Australia have investigated the trade-off between sperm quality and immunity. The researchers used the Australian cricket, Teleogryllus oceanicus to prove that the...

The Secret Sex Life Of The Promiscuous Deep-Sea Squid
2011-09-21 09:55:59

   [ Watch the Video ] Researchers on an 18-year study of the Octopoteuthis deletron, a species of squid that is found at a depth of 1300 to 2600 feet in the Eastern Pacific Ocean, found that males mate as often with their own gender as they do with females, reports BBC News. By studying footage taken by submersible vehicles, researchers, led by Hendrik Hoving of the Monterey Bay Aquarium Research Institute (MBARI) in Moss Landing, California, found that this rarely...

2011-08-08 12:11:31

Scientists at the University of Liverpool have found that male fruitflies experience a type of 'paranoia' in the presence of another male, which doubles the length of time they mate with a female, despite the female of the species only ever mating with one male. Females in many species of animal have multiple mates and males have evolved particular reproductive characteristics to ensure their sperm are successful when in competition with the sperm of other males. Adaptations include physical...

2011-03-25 11:18:42

Researchers from Osaka University and the National Institute for Basic Biology, Japan, have found a highly significant connection between the molecular mechanisms underlying genetic and environmental sex determination. The scientists report in the open-access journal PLoS Genetics the identification of a gene responsible for the production of males during environmental sex determination in the crustacean Daphnia. Ways in which an individual organism's sex is determined are diverse among...

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2010-10-26 13:45:30

New research has provided the first evidence that 'gender bending' chemicals which find their way from human products into rivers and oceans can have a significant impact on the ability of fish to breed in UK Rivers. The findings from the four year study, led by the universities of Exeter and Brunel, has important implications for understanding the impacts of these chemicals on ecosystem health and possibly on humans. Endocrine disrupting chemicals (EDCs) disrupt the ways that hormones work...

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2010-04-16 08:31:19

A multicellular green alga, Volvox carteri, may have finally unlocked the secrets behind the evolution of different sexes. A team led by researchers at the Salk Institute for Biological Studies has shown that the genetic region that determines sex in Volvox has changed dramatically relative to that of the closely related unicellular alga Chlamydomonas reinhardtii. Their findings, which will be published in the April 16th issue of the journal Science, provide the first empirical support for a...


Latest Male Reference Libraries

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2011-04-28 17:50:48

Wolbachia is a genus of bacteria which infects arthropod species, including a high proportion of insects (~60% of species). It is one of the world's most common parasitic microbes and possibly the most common reproductive parasite in biosphere. Studies have suggested that 25-70% of all insect species are estimated to be potential hosts. Marshall Hertig and Burt Wolbach first identified the bacterium in 1924 in a species of mosquito. Hertig described the genus as Wolbachia pipientis. Not...

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Word of the Day
snash
  • To talk saucily.
  • Insolent, opprobrious language; impertinent abuse.
This word is Scots in origin and probably imitative.