HOME >> BIOLOGY >> NEWS
Proteaceae spread by continental drift and transoceanic dispersal

Using DNA sequence data, botanists have shown that the large southern hemisphere plant family Proteaceae lived on the super-continent Gondwanaland almost 120 million years ago. As Gondwanaland broke up, it was originally thought that these plants merely moved with the newly formed continents. But now a new study published in the Journal of Biogeography has shown that, while this is the case for some of these plants, others are far too recent to have lived at the time when the super-continent broke up. They must therefore have dispersed across oceans to reach their current distribution ranges.

Barker et al. apply a technique known as molecular dating to DNA sequences from over 40 representatives of the family from all southern continents. Using carefully selected fossils that are of known age and affinity, the mutation rate of the DNA sequences was calculated, allowing these scientists to provide age estimates for evolutionary events in the family. Our results show that ancestors of some of the modern Proteaceae must have crossed the Atlantic and Indian Oceans. Thus, in Africa, for example, the spectacular genus Protea is truly Gondwanan, but 250 species from other genera that occur in the fynbos vegetation (literally, fine leaved shrubs) of the highly diverse south-western Cape biodiversity hotspot are much younger, and have Australian relatives says Nigel Barker of Rhodes University, South Africa.

This new finding is important, as it challenges the dogma that gondwanalands biota merely moved in situ with the continents as they broke up. We have to reconsider the possibility of transoceanic dispersal, as unlikely as it sounds for these plants says Peter Weston, a researcher at the Royal Botanic Gardens, Sydney, Australia. While this is not the first study to invoke dispersal, it is the first on a major and diverse Gondwanan plant family with complex distribution patterns. These results are not only relevant to botanists. Ornithologists will
'"/>

Contact: Samantha Holford
samantha.holford@oxon.blackwellpublishing.com
44-018-654-76269
Blackwell Publishing Ltd.
8-Aug-2007


Page: 1 2

Related biology news :

1. Californians urged to help reduce spread of Sudden Oak Death
2. Citrus greening continues to spread in citrus growing areas
3. A compound from olive-pomace oil gets 80 percent slowing down of HIV spread
4. Revealed -- Mosquito genes that could be controlling the spread of killer viruses
5. How memory T cells curb the spread of viruses throughout the body
6. Small-scale agricultural changes may help eradicate widespread disease
7. Cornell lab confirms deadly fish virus spreading to new species
8. Landmark study details demographic, ecological and genetic spread of rabies in raccoon outbreak
9. Cancer cells reprogram energy needs to grow and spread, study suggests
10. Supermap of avian flu yields new info on source/spread
11. Researchers create interactive map with Google technology to track avian flu spread

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


(Date:1/20/2019)... ... January 16, 2019 , ... uBiome, the leader ... platform that uses artificial intelligence (AI) and a data-centric approach to decentralize medicine ... ulcerative colitis. , People will Crohn’s or other chronic medical conditions join a ...
(Date:1/20/2019)... , ... January 18, 2019 , ... Boston-based Laboratory as ... in an effort to better express its continued expansion and service offerings for ... for a new kind of lab: one that is more agile and adaptable than ...
(Date:1/10/2019)... ... ... Dr. Beanlands is the Vered Chair and Division Head of Cardiology at ... Director of its National Cardiac PET Centre, and Professor in the University's Division of ... Department of Cellular and Molecular medicine. , He is a founding member of ASNC, ...
Breaking Biology News(10 mins):
(Date:1/24/2019)... ... ... Dr. Douglas Stramel of Advanced Care Veterinary Services in Carrollton, ... for nearly three years. A proponent of Regenerative Medicine, Dr. Stramel has been ... V-PET™ 2016. V-PET™ is a gravity filtration-based platelet therapy kit that produces a ...
(Date:1/20/2019)... ... 16, 2019 , ... On January 15 of this year, the Parents’ Guide ... director James L. Sherley, M.D., Ph.D. The PGCB was founded by former ... CellTrials.org. Now in its 21st year of operation, the PGCB continues its mission ...
(Date:1/20/2019)... ... January 17, 2019 , ... TrakCel, ... developer, and The Quick Life Science Group (Quick Healthcare and QuickSTAT) today announce ... enables the global cell and gene therapy industry to track products and manage ...
(Date:1/11/2019)... , ... January 11, 2019 , ... Drawing on over ... Tuesday, January 22, 2019 at 2:30pm EST will explore some of the key lessons ... of using one vendor vs. using multiple vendors, and find out how to ensure ...
Breaking Biology Technology:
Cached News: