Runtuhnya hutan hujan melajukan evolusi reptilia--T-REC-komunitas reptil-semarang--KSE-komunitas satwa eksotik

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Runtuhnya hutan  hujan   melajukan  evolusi reptilia

Pemanasan global menghancurkan hutan hujan tropis 300 juta tahun yang lalu . ....Sekarang para ilmuwan melaporkan penemuan tak terduga bahwa acara ini memicu ledakan evolusi di antara reptil - dan secara tidak sengaja membuka jalan bagi munculnya dinosaurus , 100 juta tahun kemudian .....read more

Rainforest collapse drove reptile
evolution

Date:

November 29, 2010

Source:

University of Bristol

Summary:

Global warming devastated tropical rainforests 300 million years ago. Now
scientists report the unexpected discovery that this event triggered an evolutionary
burst among reptiles -- and inadvertently paved the way for the rise of
dinosaurs, 100 million years later.

.......................

Global warming
devastated tropical rainforests 300 million years ago. Now scientists report
the unexpected discovery that this event triggered an evolutionary burst among
reptiles -- and inadvertently paved the way for the rise of dinosaurs, 100
million years later.

This event happened during the Carboniferous Period. At that time, Europe
and North America lay on the equator and were covered by steamy tropical
rainforests. But when the Earth's climate became hotter and drier, rainforests
collapsed, triggering reptile evolution.

Dr Howard Falcon-Lang of Royal Holloway, University of London, UK
explained: "Climate change caused rainforests to fragment into small
'islands' of forest. This isolated populations of reptiles and each community
evolved in separate directions, leading to an increase in diversity."

Professor Mike Benton of the University of Bristol, UK added: "This is
a classic ecological response to habitat fragmentation. You see the same
process happening today whenever a group of animals becomes isolated from its
parent population. It's been studied on traffic islands between major road
systems or, as Charles Darwin famously observed in the Galapagos, on oceanic
islands."

Ms Sarda Sahney, also of the University of Bristol, UK said: "It is
fascinating that even in the face of devastating ecosystem-collapse, animals
may continue to diversify through the creation of endemic populations."
However, she warned that: "Life may not be so lucky again in the future,
should the Amazon rainforest collapse."

To reach their conclusions, the scientists studied the fossil record of
reptiles before and after rainforest collapse. They showed that reptiles became
more diverse and even changed their diet as they struggled to adapt to rapidly
changing climate and environment.







Story Source:

The above story is based on materials provided by University
of Bristol. Note: Materials may be edited for content and length.







Journal Reference:

1.   
S. Sahney, M. J. Benton, H. J. Falcon-Lang. Rainforest collapse triggered
Carboniferous tetrapod diversification in Euramerica. Geology,
2010; 38 (12): 1079 DOI: 10.1130/G31182.1

 sumber

http://www.sciencedaily.com/releases/2010/11/101129203329.htm

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