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


A new species of endemic treefrog from Madagascar
A new species of the Boophis rappiodes group is described from the hidden streams of Ankarafa Forest, northwest of Madagascar. The study was published in the open access journal ZooKeys.

Unraveling the mysteries of the Red Sea: A new reef coral species from Saudi Arabia
The hard corals primarily responsible for the construction of coral reefs around the world have attracted the attention of taxonomists for hundreds of years.

Giant Amazon fish becoming extinct in many fishing communities, saved in others
An international team of scientists has discovered that a large, commercially important fish from the Amazon Basin has become extinct in some local fishing communities.

Can a new species of frog have a doppelgänger? Genetics say yes
Recently, Malaysian herpetologist Juliana Senawi puzzled over an unfamiliar orange-striped, yellow-speckled frog she'd live-caught in swampland on the Malay Peninsula.

A synopsis of the carabid beetle tribe Lachnophorini reveals remarkable 24 new species
An extensive study by Smithsonian scientists presents a synopsis of the carabid beetle tribe Lachnophorini. The research contains a new genus and the remarkable 24 new species added to the tribe. The study was published in the open access journal ZooKeys.

Researcher Reveals How Amphibians Crossed Continents
There are more than 7,000 known species of amphibians that can be found in nearly every type of ecosystem on six continents. But there have been few attempts to understand exactly when and how frogs, toads, salamanders and caecilians have moved across the planet throughout time.

Flores bones show features of Down syndrome, not a new 'hobbit' human
In October 2004, excavation of fragmentary skeletal remains from the island of Flores in Indonesia yielded what was called "the most important find in human evolution for 100 years." Its discoverers dubbed the find Homo floresiensis, a name suggesting a previously unknown species of human.

Scientists name new species of cetacean: The Australian humpback dolphin
Scientists examining a taxonomically confused group of marine mammals have officially named a species new to science: the Australian humpback dolphin, Sousa sahulensis, according to the Wildlife Conservation Society and Clymene Enterprises.

Oldest Beetle in Omaliini Tribe Found in Amber
An international team of scientists from Spain, France, and the U.S. has discovered and described a rove beetle that is the oldest definitive member of the tribe Omaliini that has ever been found in amber.

Brother of Hibiscus is found alive and well on Maui
Most people are familiar with Hibiscus flowers- they are an iconic symbol of tropical resorts worldwide where they are commonly planted in the landscape. Some, like Hawaii's State Flower- Hibiscus brackenridgei- are endangered species.
More New Species Current Events and New Species News Articles

Darkness: 12 (New Species)

Darkness: 12 (New Species)
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...

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...

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...

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...

Shadow (New Species Book 9)

Shadow (New Species Book 9)
by Ellora's Cave Publishing Inc.


Book 9 in the New Species series. While each New Species book is a standalone, the greatest enjoyment will come from reading them in series order.Beauty resents being labeled Gift Species. Everyone is way too overprotective, males aren’t even allowed to speak to her and so far, true freedom eludes her. Then a big, sexy Species officer mistakes her for the enemy and takes her...

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...

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...

HASH: Human Alien Species Hybrid (Book #1) (The Imprint Trilogy)

HASH: Human Alien Species Hybrid (Book #1) (The Imprint Trilogy)


Every night, Jade is rattled by a recurring dream—a dream that’s as real as the research institute where she lives. When flames fall from the sky and an alien ship crashes into Earth, Jade becomes government property and at the mercy of scientists. After all, she’s imprinted with an intelligent alien metal that could be the answer to all of Earth’s problems.

However, in the wrong hands, the metal implant could become the deadliest weapon known to humankind.

Kept underground for sixteen years, Jade fights to keep her sanity and understand the intelligent organism that is wrapped around her spine. When a new company takes over the science institute, Jade’s alien symbiont warns her of imminent danger.

Then Jade meets Aric, the lone survivor from the...

Close Liaisons (The Krinar Chronicles: Volume 1)

Close Liaisons (The Krinar Chronicles: Volume 1)
by Mozaika Publications


***Book 1 of a completed trilogy. FREE for a limited time!***

A dark and edgy romance that will appeal to fans of erotic and destructive relationships . . .

In the near future, the Krinar rule the Earth. An advanced race from another galaxy, they are still a mystery to us—and we are completely at their mercy.

Shy and innocent, Mia Stalis is a college student in New York City who has led a very normal life. Like most people, she’s never had any interactions with the invaders—until one fateful day in the park changes everything. Having caught Korum’s eye, she must now contend with a powerful, dangerously seductive Krinar who wants to possess her and will stop at nothing to make her his own.

How far would you go to regain your...

© 2014 BrightSurf.com