HOME >> BIOLOGY >> NEWS
First phylogeographic study of a rainforest tree

In species-rich rainforests of the New World tropics most trees have broad geographic distributionsfrom Mexico to Bolivia and sometimes to the West Indies. Either they have excellent dispersal abilities, or they established broad ranges prior to the formation of present geographic barriers. In a study featured in American Naturalist, Christopher Dick, Kobinah Abdul-Salim and Eldredge Bermingham address these questions in the first phylogeographic study of a rainforest tree.

The morphology of the study species, Symphonia globulifera (Clusiaceae) is uniform across a natural range that includes the New World tropics and Africa. Symphonia globulifera also has a detailed fossil pollen record, which the authors used to calibrate a molecular clock for DNA sequences obtained from African and Neotropical populations and to estimate when these populations were separated. The study revealed that, although trees from different populations look the same, the evolutionary history of these populations is probably quite distinct.

Although marine dispersal of S. globulifera is considered improbable because it has salt-intolerant seeds, the authors demonstrate that Symphonia expanded into Mesoamerica, the Amazon basin and the West Indies via oceanic currents at least three times. The three major New World clades found in Mesoamerica, the Amazon basin, and the West Indies diverged over 15 million years ago, and appear to have been genetically isolated ever since, giving Symphonia globulifera the status of "living fossil".

Panama contained the largest number of genetically distinctive populations, in contrast to Amazon basin Symphonia, which displayed no genetic differentiation across 2500 km of lowland forest. The authors suggest that strong phylogeographic structure in the Panamanian Isthmus stems from its history as a land bridge between Central America, South America, and the proto-Isthmian archipelago of islands, which were connected ap
'"/>

Contact: Christopher Dick
dickc@naos.si.edu
202 786 2094 8817
Smithsonian Tropical Research Institute
5-Dec-2003


Page: 1 2

Related biology news :

1. First glimpse of DNA binding to viral enzyme
2. First clinical study of new pediatric croup vaccine shows safety, tolerability in adults
3. 2nd media alert First Scientific Conference on Childhood Leukaemia
4. First International Scientific Conference on Childhood Leukaemia
5. First ever standards linking climate change, biodiversity and poverty seek global peer review
6. First genetic comparison of purebred domestic dogs produces surprises
7. First time in the U.S.: Saint Louis University tests third-generation vaccine against smallpox
8. First target for childhood malaria vaccine
9. First study of resveratrol dietary supplement finds effect on breast and prostate cancers unlikely
10. First flavors form a lasting impression
11. STN International launches Derwent World Patents Index First View

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


(Date:8/14/2018)... RESTON, Va. (PRWEB) , ... August 14, 2018 ... ... stigmas were recently depicted in the movie “Wonder,” to a better understanding of ... defects treatments, according to editors of the latest special issue of Birth ...
(Date:8/7/2018)... EDWARDSVILLE, Ill. (PRWEB) , ... August 06, 2018 ... ... corn growing in front of The NCERC at Southern Illinois University Edwardsville’s University ... corn, but also grain sorghum and sweet sorghum. These three feedstocks represent conventional ...
(Date:8/2/2018)... ... August 02, 2018 , ... The ... innovator Boston Heart Diagnostics to its Lifestyle Medicine Corporate Roundtable, a group of ... care system and a sustainable world. , Boston Heart is transforming the ...
Breaking Biology News(10 mins):
(Date:7/25/2018)... MATEO, Calif. (PRWEB) , ... July 25, 2018 ... ... for in vivo research utilizing its state-of-the-art Digital Vivarium™ and Vium Cloud approach ... Schaevitz, Ph.D., to Chief Scientific Officer. Additionally, the company announced the appointment of ...
(Date:7/25/2018)... ... July 25, 2018 , ... John McDonald, CEO ... board of the Indiana India Business Council (IIBC), an advocacy group to strengthen ... current board of directors, McDonald joins an impressive roster of local and national ...
(Date:7/24/2018)... ... July 24, 2018 , ... Boval was founded in 1978 ... reagent suppliers. In Boval’s early days most of the BSA manufactured was for ... BSA for diagnostic purposes after gel cards changed that market and displaced most of ...
(Date:7/22/2018)... ... July 19, 2018 , ... Mitotech ... with Essex Bio-Investment for Phase 3 clinical program in Dry Eye Disease. Under ... SkQ1 with approximately $17m allocated towards the first Phase 3 study starting as ...
Breaking Biology Technology:
Cached News: