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


New planthopper species found in southern Spain
Not much is known about the the genus of planthopper known as Conosimus, which now includes six species after a new one was recently discovered in the southern part of the Iberian Peninsula in the Spanish city of Jaen.

Scientists enlist big data to guide conservation efforts
Despite a deluge of new information about the diversity and distribution of plants and animals around the globe, "big data" has yet to make a mark on conservation efforts to preserve the planet's biodiversity. But that may soon change.

A new measure of biodiversity
A new approach to measuring biodiversity has uncovered some biologically important but currently unprotected areas in Western Australia, while confirming the significance of the world heritage listed Wet Tropics rainforests in the country's north-east.

Four new species of tuco-tucos identified from Bolivia
A research team led by Scott Gardner of the University of Nebraska-Lincoln has identified four new species of Ctenomys, a genus of gopher-like mammal found throughout much of South America.

New mite species from a Caribbean mesophotic coral ecosystem named after J.Lo
During a recent survey of organisms collected from Bajo de Sico, a mesophotic coral reef ecosystem in Mona Passage off Puerto Rico, one pontarachnid mite species new to science was discovered.

New plant species from the heart of Texas
Collectors found the first two specimens of the prickly plant in 1974 and 1990 in west Texas. Then, for two decades, the 14-inch-tall plant was identified wrongly as one species, then another and then a third.

A Spaniard and a Portuguese discover a new species of beetle in the world's deepest cave
The unusual habitat of the Krubera cave in the Western Caucasus remains a mystery. Researchers from two Spanish universities have discovered a new species of beetle in the depths of this cave.

Brewing yeasts reveal secrets of chromosomal warfare and dysfunction
Using two yeasts that have been used to brew tea and beer for centuries, researchers at Fred Hutchinson Cancer Research Center have revealed how reproductive barriers might rapidly arise to create species boundaries. Schizosaccharomyces pombe has been used to brew beer in Africa, whereas its close relative S. kombucha is a component of kombucha tea commonly found in health-food stores.

Restricting competitors could help threatened species cope with climate change
Threatened animal species could cope better with the effects of climate change if competition from other animals for the same habitats is restricted, according to new research by Durham University.

The genes tell crows to choose partners that look alike
Crows like to select mates that look alike. In a large-scale genomic study, published in Science today, a team of researchers led by Uppsala University found that this behaviour might be rooted in their genetic make-up, revealing a likely common evolutionary path that allows for separating populations into novel species.
More New Species Current Events and New Species News Articles

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...

The Mating: The Original Law of the Lycans Story

The Mating: The Original Law of the Lycans Story
by Nicky Charles, via Smashwords


Elise had no idea when she came home that day that she'd end up mated to a complete stranger. A new Alpha and the need for an alliance between packs have made her a pawn Excerpt: She lay beside him, staring blankly at the ceiling. The deed was done. They were mated. It didn't matter that she had no love for him nor he for her. Political alliances were more important than feelings...

Immortal Ops Box Set Books 1-4 (Shifter Romances)

Immortal Ops Box Set Books 1-4 (Shifter Romances)
by The Raven Books


Amazon Best Seller!
BN Top 100!

Contains:

1. Immortal Ops

2. Critical Intelligence

3. Radar Deception

4. Strategic Vulnerability


Immortal Ops
Captain Lukian Vlakhusha is having issues with his newest target, Peren Matthews. Something about her has left him staring at her picture and wondering what it would be like to touch her soft skin. When the time comes for the team to strike, Lukian senses danger and aborts the mission. He makes an attempt at meeting Peren and is set in his place by an independent young woman who knows what she is, and isn't, looking for in a man.

Lukian is having trouble telling Peren that he's what she fears most, a werewolf. Can they make the passion that burns between...

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...

Slade (New Species Book 2)

Slade (New Species Book 2)
by Ellora's Cave Publishing Inc.


Book 2 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. Trisha Norbit is flat on her back in a hospital bed, pinned under a really big New Species male. Though drugged out of his mind, he promises her ecstasy and is determined to deliver—but hospital staff intervenes. 215 is a man Trisha will never forget. But, when she meets him again at Homeland…he doesn’t even remember her!The nosy new doctor wants to know all about the breeding habits between humans and Species. Slade proposes a hands-on education but she’s not interested in a one-night stand. He can’t offer more because he’s haunted by the memory of a woman he once tried to claim. He’s shocked when he realizes...

Grim (Tornians Book 1)

Grim (Tornians Book 1)


King Grim Vasteri is the strongest and most feared warrior in the Tornian Empire. He is the King of Luda, blood brother to the Emperor and his line will die with him. He will have no offspring for no female would join with him for once he was scarred he was considered 'unfit'. The Tornian Empire has been dying ever since the great infection caused the birth of females to become a rarity. Since then they have been searching the known universes for compatible females. The Emperor's discovery of a compatible female on a slave ship changed that. He'd ordered Grim to find his Empress' home world so more 'unprotected' females could be obtained, knowing Grim would never be allowed to Join with one.
Lisa Miller is a widowed mother of two little girls, Carly and Miki. Her husband died...

Fury (New Species Book 1)

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


Book 1 in the New Species series.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 can’t resist Ellie—the touch of her hands, her mouth on his skin, her body wrapped around his. He’s obsessed with the scent of...

Tiger (New Species Book 7)

Tiger (New Species Book 7)
by Ellora's Cave Publishing Inc.


Book 7 in the New Species series.Zandy’s had too much to drink and is in the wrong place at the wrong time. She knows she’s going to die. When next her eyes open, a beautiful man-creature is holding her in his arms. He’s just too tempting to resist; her very own fallen angel. She wraps herself around his body, determined to have him. But when this angel turns out to be flesh and blood, reality crashes in—she’s seducing a New Species.
Tiger’s shock quickly turns to intense passion when the human female kisses him, despite the fact she’s trying to get his clothes off while he’s engaged in a task force operation. He’s also made it clear he’ll never take a mate. Rather difficult when he and Zandy can’t keep their hands off each other. The taste and feel of his...

Brawn (New Species Book 5)

Brawn (New Species Book 5)
by Ellora's Cave Publishing Inc.


Book 5 in the New Species series.One look at Brawn, and Becca is wondering how he’d look without his clothes. He’s also instantly attracted to her, but has sworn never to touch a human female. They just aren’t sturdy enough for the type of rough sex Brawn enjoys most. When he learns he’ll be living under the same roof with Becca, Brawn simply sees it as a chance to broaden his knowledge of humans. Hopefully he can do so while keeping his hands off her…His good intentions go astray when they’re both kidnapped and locked together in a cage. Brawn finds himself reliving a nightmare when he’s once again subjected to breeding experiments at the hands of New Species’ enemies—who will use Becca to get what they want. Brawn and Becca will have to depend on each other if they...

Obsidian (New Species Book 8)

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


Book 8 in the New Species series.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 Mercile stole everything from him so he decides it’s fair to take her in return.
But things quickly change and he wants...

© 2014 BrightSurf.com