Navigation Links
Tropical birds waited for land crossing between North and South America: UBC study
Date:12/9/2009

Despite their ability to fly, tropical birds waited until the formation of the land bridge between North and South America to move northward, according to a University of British Columbia study published this week in the Proceedings of the National Academy of Sciences Early Edition.

"While many North American birds simply flew across the marine barriers that once separated the continents, tropical birds, especially those in Amazon forest regions, began colonization of North America almost entirely after the completion of the land bridge," says lead author Jason Weir, who conducted the study as part of his PhD at UBC.

"This study is the most extensive evidence to date that shows the land bridge playing a key role in the interchange of bird species between North and South America and the abundant biodiversity in the tropical regions," says Weir, now a post-doctoral fellow at the University of Chicago.

The Isthmus of Panama land bridge was completed between three and four million years ago, and today consists of the country of Panama. It is believed to have initiated the Great American Biotic Interchange, bringing mammals that evolved uniquely in South America during its "island isolation" the armadillo, opossum and porcupine to North America.

Fossil records have shown that mammalian species also travelled across the land bridge from North to South America, increasing biodiversity in the tropical regions. "But a lack of bird fossils has made it difficult to determine if the land bridge was equally instrumental in the interchange of avian species," says Weir.

By analyzing the DNA of 457 bird species on either side of the land bridge, Weir and colleagues at UBC and the Smithsonian Tropical Research Institute in Panama were able to reconstruct a "family tree" of species closely related to one another and revealed a "hidden chapter" in the impact of the land bridge to biodiversity. They found a dramatic increase in the rates of interchange after the land bridge completion.

"This is a bit surprising," says co-author Dolph Schluter, UBC zoology professor and Canada Research Chair in Evolutionary Biology. "Couldn't the birds have flown across the gap? Some did, but most tropical birds waited for the land crossing."

The researchers believe the inability of many tropical birds to fly long distances across open water some are reluctant even to cross rivers as narrow as 200 metres may have contributed to the few north-bound movements prior to the land bridge completion.


'/>"/>

Contact: Brian Lin
brian.lin@ubc.ca
604-822-2234
University of British Columbia
Source:Eurekalert

Related biology news :

1. Tropical forests affected by habitat fragmentation store less biomass and carbon dioxide
2. Plant fossils give first real picture of earliest Neotropical rainforests
3. Global warming threatens tropical species, the ecosystem and its by-products
4. Coralline algae in the Mediterranean lost their tropical element between 5 and 7 million years ago
5. New guide to tropical seedlings: Essential to climate change research
6. Australias climate: Drought and flooding in annual rings of tropical trees
7. Live-in domestics: Mites as maids in tropical rainforest sweat bee nests
8. Biological control of tropical weeds using arthropods
9. AAAS Symposium: Emerging threats to tropical, temperate and ocean ecosystems
10. Scientists use lasers to measure changes to tropical forests
11. Lifecycles of tropical cyclones predicted in global computer model
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:3/28/2017)... , March 28, 2017 The ... Hardware (Camera, Monitors, Servers, Storage Devices), Software (Video Analytics, ... Region - Global Forecast to 2022", published by MarketsandMarkets, ... 2016 and is projected to reach USD 75.64 Billion ... and 2022. The base year considered for the study ...
(Date:3/24/2017)... 24, 2017 The Controller General of Immigration from ... Abdulla Algeen have received the prestigious international IAIR Award for the ... Continue Reading ... ... Controller Abdulla Algeen (small picture on the right) have received the IAIR ...
(Date:3/23/2017)... The report "Gesture Recognition and Touchless Sensing Market by Technology (Touch-based ... to 2022", published by MarketsandMarkets, the market is expected to be worth USD ... 2022. Continue Reading ... ... ...
Breaking Biology News(10 mins):
(Date:10/11/2017)... and LAGUNA HILLS, Calif. , Oct. ... Cancer Research, London (ICR) and University ... SKY92, SkylineDx,s prognostic tool to risk-stratify patients with multiple myeloma ... MUK nine . The University of Leeds ... partly funded by Myeloma UK, and ICR will perform the ...
(Date:10/10/2017)... ... 2017 , ... San Diego-based team building and cooking events company, Lajollacooks4u, has ... The bold new look is part of a transformation to increase awareness, appeal to ... period. , It will also expand its service offering from its signature gourmet cooking ...
(Date:10/10/2017)... 10, 2017 International research firm Parks Associates announced ... at the TMA 2017 Annual Meeting , October 11 in ... residential home security market and how smart safety and security products impact ... Parks Associates: Smart Home ... "The residential security market has ...
(Date:10/9/2017)... DIEGO , Oct. 9, 2017  BioTech ... biological mechanism by which its ProCell stem cell ... critical limb ischemia.  The Company, demonstrated that treatment ... amount of limbs saved as compared to standard ... the molecule HGF resulted in reduction of therapeutic ...
Breaking Biology Technology: