Science Current Events | Science News | Brightsurf.com
 

Genes from the father facilitate the formation of new species

October 05, 2007
The two closely related bird species, the collared flycatcher and the pied flycatcher, can reproduce with each other, but the females are more strongly attracted to a male of their own species. This has been shown by an international research team directed by Anna Qvarnström at Uppsala University in today's Net edition of Science. They demonstrate that the gene for this sexual preference is found on the sex chromosome that is inherited from the father and that only females have a copy of. The discovery sheds new light on how new species are formed.

The formation of new species takes millions of years. It often happens when a population (group of individuals) is divided and separated geographically and then adapts to disparate environments over thousands of generations. For instance, the earth's ice ages have led to many such population splits. But divided populations often come into contact with each other before they have had time to become entirely sexually isolated from each other. When individuals mate with each other from such split populations that have not quite become separate species, their offspring (so-called hybrids) often have limited viability.

Anna Qvarnström's research team from Uppsala University in Sweden, working with scientists from Norway, the Czech Republic, the US, and Holland, have studied natural hybridization between two closely related bird species, the collared flycatcher and the pied flycatcher. The two flycatcher species (or "quasi species") have come into contact with each other after having been separated during the last ice age. The question they addressed was whether the flycatchers will conclude the species formation that is under way and become entirely sexually isolated from each other or, instead, if they will meld into the same species again.

"We found that females in the hybrid zone develop a sexual preference for males belonging to their own species and that this preference is determined by genes located on the sex chromosome," says Anna Qvarnström.

In birds, in contrast with most other animals, it is the females that are the so-called heterogametic sex. Their sex chromosomes are called ZW and correspond to XY in humans. In birds, it is the female that is ZW and the male ZZ, but in humans men are XY and women XX. The results show that the preference for their own species is sited on the sex chromosome that the females inherit from their father. The same chromosome also houses the genes that govern the development of the species-specific plumage.

"When genes regulate species-specific features and the preference for these are located close to each other in the DNA, in this case on the same chromosome, species formation is favored. Therefore, the probability of these two flycatcher species merging into the same species again is small," says Anna Qvarnström.

It is possible that this will prove to be a general pattern that can explain how new species can continue to exist even if they occasionally hybridize with each other.

Uppsala University


Related New Species Current Events and New Species News Articles


Female fish genitalia evolve in response to predators, interbreeding
Female fish in the Bahamas have developed ways of showing males that "No means no."

The Tree of Life may be a bush
New species evolve whenever a lineage splits off into several. Because of this, the kinship between species is often described in terms of a 'tree of life', where every branch constitutes a species.

Evolution peaks on tropical mountain
On tropical mountains, exceptional numbers of species occur. This is because temperature and environment change rapidly as elevation increases.

Predator from a tank: New water mite genus from bromeliad phytotelmata
An extensive sampling effort in bromeliad aquatic fauna in Brazilian subtropical area of the Atlantic rainforest, revealed a new water mite genus and a new species in the Atlantic rainforests in SĂ£o Paulo, Brazil.

Evolutionary war between microorganisms affecting human health, IU biologist says
Health experts have warned for years that the overuse of antibiotics is creating "superbugs" able to resist drugs treating infection.

Research could lead to protective probiotics for frogs
In research that could lead to protective probiotics to fight the "chytrid" fungus that has been decimating amphibian populations worldwide, Jenifer Walke, PhD, a postdoctoral researcher at Virginia Tech University, Blacksburg, and her collaborators have grown bacterial species from the skin microbiome of four species of amphibians.

Twisted wasps: Two new unique parasitoid wasp species sting the heart of Europe
Much to his own surprise, Hannes Baur from the Natural History Museum Bern not only reports on whole two new parasitoid wasps at the heart of Europe, the Swiss Alps and Swiss Central Plateau.

First species of yeti crab found in Antarctica
The first species of Yeti Crab from hydrothermal vent systems of the East Scotia Ridge in the Southern Ocean, Antarctica, has been described in a study published June 24 in the open-access journal PLOS ONE by Sven Thatje from University of Southampton, and colleagues.

Professor discovers new lichen species in city of Boulder
A University of Colorado Boulder scientist unexpectedly discovered two lichen species new to science in the same week while conducting research in Boulder Colorado, near the city's eastern limits.

From Darwin to moramora ('take it easy'): Ten new subsocial spider species from Madagascar
Ten subsocial cobweb spider species were discovered in a research on nearly 400 Madagascan colonies, conducted by Dr. Agnarsson's team. Most of them are single forest endemics and belong to one genus, Anelosimus.
More New Species Current Events and New Species News Articles

Ethan's Mate (The Vampire Coalition Book 1)

Ethan's Mate (The Vampire Coalition Book 1)
by J. S. Scott Publishing


Ethan Hale is a vampire with a mission. Together with his three brothers and a few other unmated members, he fights with The Vampire Coalition to protect humans from fallen vampires. His life is fairly simple. If he has a problem...he solves it. If it's an evil problem...he kills it. But his uncomplicated life is about to end when his mate unexpectedly calls him to her.

Brianna Cole is weak, her life force fading away. She thinks she is suffering from a rare form of leukemia. Little does she knows that her illness is much more complicated. She's dying because she has not united with her vampire mate and given him his soul that she has been guarding since birth.

Ethan finds Brianna and knows he needs to convince her to mate or watch her die. He's waited...

Smiley (New Species Book 13)

Smiley (New Species Book 13)
by Ellora's Cave Publishing Inc


Book 13 in the New Species series. It is advisable to read the books in order to get the most enjoyment from the series.`
Vanni is furious when her fiancé tricks her into attending a conference where his father’s church is protesting the New Species Organization. She hates everything those vile bigots stand for. Vanni goes to the bar to cool off and ends up seated next to a handsome New Species. Things heat up fast when they are both drugged.
Smiley doesn't want to believe the sweet human would dose them with the breeding drug. He's willing to trust her and determined to save her life. He'll hold her. Protect her. Offer up his body to distract them both from the pain. She is his female, even if she doesn't realize it yet.
Reader Advisory: This story has graphic sexual...

Fury (New Species Book 1)

Fury (New Species Book 1)
by Ellora's Cave Publishing Inc


Book 1 in the New Species series. While each New Species book is a standalone, the greatest enjoyment will come from reading them in series order.
Ellie is horrified to discover the pharmaceutical company she works for is doing illegal experiments. Company scientists have spliced human and animal DNA, creating exotic new species. One such “experiment” captures her heart and she’ll do anything to save him—even if he hates her for it.
Fury has never known compassion or love. He’s spent his life in a cell, chained and abused by humans. The one woman he allowed himself to trust betrayed him. Now he’s free and set on vengeance. He vows to end her life but when she’s finally in his grasp, harming her is the last thing he wants to do to the sexy little human.
Fury...

Darkness (New Species Book 12)

Darkness (New Species Book 12)
by Ellora's Cave Publishing Inc


Book 12 in the New Species series. It is advisable to read the books in order to get the most enjoyment from the series.
Kat’s boss wants dirt on the NSO. She is sent to Homeland undercover but everything goes wrong as soon as she enters the front gates. She is arrested by a big, powerful, sexy New Species but she is not frightened. He turns her on and things heat up fast between them. Now, she just hopes he doesn’t break her heart.
Darkness admires Kat’s courage but he cannot trust anything she says. He hasn’t been with a female for years because he knows he is too damaged. He is not mate material, despite his desire to possess her in every way. Darkness fears losing control—the one thing that defines his life. He doesn’t think he can tear down the protective walls...

Moon (New Species)

Moon (New Species)
by Laurann Dohner (Author)


Book 10 in the New Species series. The books can be read as stand-alone stories, but it is advisable to read them in order to get the most enjoyment from the series. Dr. Joyce Yards has never met anyone as sexy or as irresistible as 466. He refuses to discuss anything except getting her naked beneath him. Their therapy sessions are growing hotter, his raw hunger for her is becoming aggressive, and she is falling for him. Joy knows the dire consequences if she gives in to desire. It will break her heart but she must walk away. Moon has been drugged. He is feral and dangerous to everyone. The NSO doctors turn to the only female Moon ever cared about—the one who left him in the desert two years ago. Moon isn’t the same male Joy once knew but she is willing to put her life on the line...

Obsidian (New Species Book 8)

Obsidian (New Species Book 8)
by Ellora's Cave Publishing Inc


Book 8 in the New Species series. While each New Species book is a standalone, the greatest enjoyment will come from reading them in series order.
Dr. Allison Baker is obsessed with saving the comatose New Species male. She has tried everything and there’s only one option left. Alli will break every rule and put her life in danger by tempting 880 to wake, using only her feminine scent and touch. She just has to kidnap him and crawl into bed with him to make it work.
880 wakes in a different world with a small female who’s been sleeping beside him, caressing him and wrapping her sweet body around his, teasing his senses. He lies silent and still, listening and evaluating each arousing touch, fighting his body’s reaction. Hatred flares when he discovers she’s human, but...

Royal Obsession (Shadow Assassins Book 1)

Royal Obsession (Shadow Assassins Book 1)
by Anything-but-Ordinary


Shadow Assassins, Book One: Radical separatists, created at the onset of the Great Conflict, have been made obsolete by years of peace. They live in their subterranean Shadow Maze and only emerge when it’s time to breed. For Varrik, that time is now.

Varrik, current leader of the Shadow Assassins, knows his people are on the verge of extinction. If they cannot adapt, they will die. Yet if his son were a direct descendant of the High Queen it would secure a place for future generations. Protecting his people is his first priority, so Varrik assembles a hunting party and kidnaps the royal twins. He is determined to claim the eldest for his own.

Echo, the younger princess, knows her pampered sister will never survive the sexual appetites of their virile captor....

True (New Species Book 11)

True (New Species Book 11)
by Ellora's Cave Publishing Inc


Book 11 in the New Species series. It is advisable to read the books in order to get the most enjoyment from the series.
Jeanie loves a New Species and is willing to pay for that love with pain, tears and heartbreak. She’ll do anything to keep 710 alive but she never wants him to know how she suffered for him. He’s the reason for her mission in life—freeing others like him.
True has a new life working with the NSO to rescue his people. A good life, until he encounters a dying woman—the female who betrayed him. True should feel gratified that she’s finally going to pay for her crimes, but she claims to be a victim too. He is still irresistibly drawn to the pretty little human who touched his heart and made him want her. When he clasps her hand to offer comfort, his...

Waking the Beast (Paranormal Shapeshifter Romance) (Awakening Pride Series, Book One) by Lacey Thorn

Waking the Beast (Paranormal Shapeshifter Romance) (Awakening Pride Series, Book One) by Lacey Thorn
by Resplendence Publishing, LLC


The legend of the Paka Watu...

Ever since she was a young girl, Abby Lane can’t resist the allure of a catshifter tribe forced to repress their beasts. On a trip to Africa, she discovers a coveted piece of information—the name the pride leader assumed when he left his home—and she traces his lineage to his descendent.

The sleeping lion...

Utah Pearce can’t keep his gaze off the woman who slips into the bar every night. Though not his usual type, she brings out the possessive instinct in him, making him battle with himself as he tries to stay away.

Mine...

Abby’s research never prepared her for the reality in front of her. The beast is waking, and Utah is changing in ways both exciting and terrifying. He is...

Into the Darkness (Darkness #1)

Into the Darkness (Darkness #1)


The First Book in the USA Today Bestselling Series

***Warning: sexual content!!! 18+ please.***

Sasha has grown up with one surety: she's not normal.

She sees things in the darkness that no one else can see. Mysterious men cloaked in shadow, moving through the night. The problem is, pointing out invisible people is a fast track to a padded cell. Orphaned at age five, Sasha quickly learns an important survival tip: keep her mouth shut and stay out of the spotlight.

Until one night, everything changes. She and her boyfriend, Jared, find themselves stranded on the wrong side of town. Suddenly, the men she was convinced were hallucinations, are very real. And very dangerous.

 Sasha must embrace the things she tried so hard to hide, while...

© 2015 BrightSurf.com