HOME >> BIOLOGY >> NEWS
Biologists uncover Darwins missing evidence for divergence of species in a warblers song

Biologists at the University of California, San Diego have demonstrated, in a study of the songs and genetics of a series of interbreeding populations of warblers in central Asia, how one species can diverge into two.

Their description of the intermediate forms of two reproductively isolated populations of songbirds that no longer interbreed is the "missing evidence" that Darwin had hoped to use to support his theory of natural selection, but was never able to find.

"One of the largest mysteries remaining in evolutionary biology is exactly how one species can gradually diverge into two," says Darren E. Irwin, a biologist at UCSD who headed the study, detailed in the January 18 issue of the journal Nature. "This process, known as speciation, is very difficult to study because it can take a great deal of time to occur."

Biologists have generally learned about the divergence of species by comparing many different species at various stages of speciation. But in their study of the greenish warbler, a songbird that breeds in forests throughout much of temperate Asia, Irwin and his colleaguesTrevor D. Price, a biology professor at UCSD, and Staffan Bensch, a former postdoctoral student at UCSD now at Swedens Lund

Universitydiscovered a rare situation known to biologists as a "ring species.""Ring species are unique because they present all levels of variation, from small differences between neighboring populations to species-level differences, in a single group of organisms," says Irwin, a former student of Price who is in the process of beginning his postdoctoral work with Bensch at Lund University.

In the case of the greenish warbler, Phylloscopus trochiloides, the scientists discovered a continuous ring of populations with gradually changing behavioral and genetic characteristics encircling the Tibetan Plateau, which is treeless and uninhabitable. This ring is broken by a species boundary at only one place, in central Siberia, where two forms of t
'"/>

Contact: Darren Irwin
greenishwarbler@hotmail.com
46-706-827864
University of California - San Diego
16-Jan-2001


Page: 1 2 3

Related biology news :

1. Biologists deciphering complex lemur scent language
2. Biologists ID defense mechanism of leading fungal pathogen
3. Biologists discover nerve activity, not just genetics controls kinds of neurotransmitters produced
4. Biologists uncover genetic links to broad range of human disorders resulting from cilia dysfunctions
5. American Society of Plant Biologists offers developing nations free access to science journals
6. Open access initiative from the Company of Biologists
7. Biologists find unexpected rapid evolution in Caribbean lizards
8. American Society of Plant Biologists Annual Meeting 2003
9. Biologists raising baby loggerhead turtles for conservation find disturbing gender trend
10. Biologists new experiment may vindicate Darwin
11. Biologists take new look at metabolism

Post Your Comments:
*Name:
*Comment:
*Email:


(Date:7/1/2020)... ... July 01, 2020 , ... Catalent, a ... purchase of Teva-Takeda Pharmaceuticals’ packaging facility in Minakuchi, located in the Shiga prefecture ... facility located in Kakegawa, the new 60,000-square-foot facility will provide customers with flexible ...
(Date:6/28/2020)... ... , ... In an upcoming episode scheduled for the fall of 2020, Advancements ... (POCT). Check local listings for more info. , Today, the majority of testing is ... labs throughout the country. Results are then available several days later. Now, in an ...
(Date:6/23/2020)... (PRWEB) , ... June 23, 2020 , ... ... supporting sustainable healthcare, and Renovagen Ltd, a UK supplier and manufacturer of innovative ... to support testing operations in the fight against the COVID-19 pandemic in Zambia. ...
Breaking Biology News(10 mins):
(Date:7/31/2020)... Mass. (PRWEB) , ... July 29, 2020 , ... ... highly reliable, solid-state radar transmitter systems that can be configured to drive Klystrons, ... single controller that can drive one or two switches in a push-pull configuration; ...
(Date:7/31/2020)... MIAMI (PRWEB) , ... July 29, 2020 , ... ... nearly 200 of the top radiation centers in 16 countries, has reached its ... years, SDX® is now in routine use at top universities including University of ...
(Date:7/18/2020)... ... July 16, 2020 , ... “We are thrilled to deliver this new technology ... technology of its kind on the market and we were pleased that the IFT ... of traditional cultured ingredients, creating a natural way to extend the shelf life and ...
(Date:7/10/2020)... ... July 09, 2020 , ... PathSensors Inc., ... has expanded the company’s exclusive license to include clinical applications for CANARY™ ... market, focusing initially on the SARS-CoV-2 biosensor. CANARY’s™ fast and highly ...
Breaking Biology Technology:
Cached News: