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Hermaphroditic plants have genetic advantage in areas where extinctions are frequent
February 22, 2006In one of the first studies to empirically compare the reproductive success of hermaphrodites and male and female populations, biologists from the University of Oxford make use of the rare and extreme sexual diversity displayed in a species of European weed to test the hypothesis that hermaphrodites have been selected in regions with frequent extinction and re-colonization.
"[We used] the general theory for the genetics of populations, which tells us that repeated bouts of extinction and re-colonization should reduce genetic diversity within populations and increase genetic differentiation between populations," explain the authors in a forthcoming article in American Naturalist.
Given the ability to colonize new populations alone, hermaphrodites have an advantage over males and females where colonization is frequent. As expected, diversity was low and differentiation high in hermaphrodite populations of the Mercurialis annua. In contrast, populations that contained males were more diverse and less differentiated from one another.
University of Chicago Press Journals
University of Chicago Press Journals
Hermaphrodites Current Events and Hermaphrodites News RSSTexas A&M-Galveston professor discovers new species of marine life
Two tiny worms much smaller than a rice grain and a strange crustacean that has no eyes and poisonous fangs are among several new species of marine life discovered in an underwater cave by a Texas A&M University at Galveston researcher, who has had one of the new species named after him.
Two From One-Pitt Research Maps Out Evolution of Genders From Hermaphroditic Ancestors
Research from the University of Pittsburgh published in the Nov. 20 edition of "Heredity" could finally provide evidence of the first stages of the evolution of separate sexes, a theory that holds that males and females developed from hermaphroditic ancestors.
Mate or hibernate? That's the question worm pheromones answer
If worms could talk, they might tell potential suitors, "I like the way you wriggle," complete with that telltale come slither look.
Sex and lifespan linked in worms: a family of sugar-like molecules controls both
A group of scientists who set out to study sex pheromones in a tiny worm found that the same family of pheromones also controls a stage in the worms' life cycle, the long-lived dauer larva.
Worms take the sniff test to reveal sex differences in brain
Buttery popcorn or fresh green vegetables? Your answer tells a lot about you. Now, scientists say that the way that thousands of tiny worms have answered that question likely reveals a lot about you and your brain, too.
New clues to how sex evolves
Sex is a boon to evolution; it allows genetic material from parents to recombine, giving rise to a unique new genome. But how did sex itself evolve\\\
Sperm trading can resolve hermaphrodite mating conflicts
By directly manipulating mating performance in a tropical sea slug, Chelidonura hirundinina, researchers of the University of T√°bingen have now shed light on the bizarre reproductive conflicts encountered by hermaphroditic animals.
Rhythm gene discovered
University of Utah biologists found a gene that controls rhythmic events in a worm's life: swallowing food, laying eggs and pooping.
Surgeons pinch more than an inch from the arm to rebuild a micropenis
A surgical procedure being pioneered by University College London (UCL) urologists is enabling men born with a very small penis to acquire an average-sized, functioning penis which not only allows them to urinate normally, but for many, to enjoy a full sex life for the first time.
Pollutant threat to oyster industry
A study published today reveals that a common industrial chemical causes sexual deformities in oysters, producing large numbers of hermaphrodite animals. The chemical, nonylphenol, is a breakdown product from a surfactant widely used in detergents, dispersing agents, herbicides, spermicides and cosmetics. Dr Helen Nice who undertook this study at Royal Holloway, University of London, says, 'Our results may cast doubt on the widespread use of this chemical in many human products including contraceptive spermicides.' Nonylphenol is a known endocrine disrupter - chemicals that interfere with the hormones of animals. It is discharged through sewage effluent and is therefore widespread in the aq
More Hermaphrodites Current Events and Hermaphrodites News Articles
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Hermaphrodites and the Medical Invention of Sex by Alice Domurat Dreger (Author) Punctuated with remarkable case studies, this book explores extraordinary encounters between hermaphrodites -- people born with "ambiguous" sexual anatomy -- and the medical and scientific professionals who were confronted by them. |
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Normal: Transsexual CEOs, Crossdressing Cops, and Hermaphrodites with Attitude by Amy Bloom (Author) Amy Bloom has won a devoted readership and wide critical acclaim for fiction of rare humor, insight, grace, and eloquence, and the same qualities distinguish Normal, a provocative, intimate journey into the lives of “people who reveal, or announce, that their gender is variegated rather than monochromatic”—female-to-male transsexuals, heterosexual crossdressers, and the intersexed. We meet Lyle Monelle and his mother, Jessie, who recognized early on that her little girl was in fact a boy and used her life savings to help Lyle make the transition. On a Carnival cruise with a group of crossdressers and their spouses, we meet Peggy Rudd and her husband, “Melanie,” who devote themselves to the cause of “ordinary heterosexual men with an additional feminine dimension.”... |
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That Pistol-Packin' Hermaphrodite Also With: Warner Bros. (Producer) |
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Fudoh - The New Generation Starring: Shosuke Tanihara, Kenji Takano, Marie Jinno, Tamaki Kenmochi, Tôru Minegishi Directed By: Takashi Miike |
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Hermaphrodite by Eric Copeland |
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Starrett 51143 243-6 6"hermaphrodite Starrett Firm Jt Caliper by Starrett Dividers Springs - Calipers Type: Firm Joint Hermaphrodite Caliper Maximum Measuring: 6 Finish/Coating: Polished Material: Ground Steel | |
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Natural History 1896 Insects Gypsy Moth Hermaphrodite by old-print NATURAL HISTORY 1896 INSECTS GYPSY MOTH HERMAPHRODITE A page and reverse from The Royal Natural History volume 6 edited by Richard Lydekker. Contents include invertebrate animals, ants bees, wasps, flies, fleas, butterflies, moths, beetles, centipedes, millipedes, scorpions, spiders, sea spiders, king crabs, crustaceans, stone lilies, star fish sea urchins, sea cucumbers, molluscs, shell fish, pond snails, worms, moss animals, lamp shells, jelly fish, corals, sea anemones and sponges. Plates and engravings by W.Kuhnert, F Specht, P J Smit, G Mutel, Gambier, Bolton, and many others. Dates 1896. Size of each plate is 10 x 7 inches (260 x 170) all are genuine prints and not modern copies. |
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Hermaphrodite Eric Copeland (Primary Contributor) |
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Sketches towards a hortus botanicus Americanus by Old Classics |
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Giovanni Francesco Penni (Hermaphrodites with yoke) White Wood-Mounted Art Poster Print - 13" X 19" by Adam Hersh Posters |
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