Hawai not an evolutionary dead end for marine life
London: Marine species were thought to colonize Hawaii and eventually diverge into an isolated native species, but were doomed to an evolutionary “dead end” with no further specialization and speciation.
However, Dr. Chris Bird and fellow researchers at the Hawaii Institute of Marine Biology (HIMB) have shown that Hawaii hosts three limpets (cone shaped marine snails, locally known as ‘opihi’) that defy classification as dead-enders.
The standard explanation for three species of ``opihi is that Hawaii was independently colonized three times. However, using DNA, fossil and geologic evidence, Bird has shown that Hawaii was successfully colonized only once by Japanese limpets, approximately 5 million years ago.
The opihi then speciated within the Hawaiian Archipelago along an ecological gradient, as they invaded deeper habitats, forming the three species that we observe today (in order from shallow to deep) ``opihi makai``auli, ``opihi ``alinalina, ``opihi ko``ele.
Bird proposes that differences in the timing of sperm and egg production and the ability to survive at particular shore levels led to the ``opihi radiation.
While ``opihi may look similar to the untrained eye, Bird demonstrates that each species possesses novel evolutionary adaptations that confer an advantage at a particular shore level, a hallmark signature of natural selection and adaptive radiation.
Prior to this report, no marine radiations had been found in Hawaii.
Bird’s findings concluded that Hawaii is not an evolutionary dead end for marine speciation.
More from India
More from World
More from Sports
More from Entertaiment
- Panel discussion over Lalu Yadav's insensitive attitude over flood situations in Bihar
- Panel discussion over Lalu Yadav's insensitive attitude over flood situations in Bihar Part II
- Panel discussion over Lalu Yadav's insensitive attitude over flood situations in Bihar Part III
- Panel discussion over Lalu Yadav's insensitive attitude over flood situations in Bihar Part IV
- Olympic bronze medallist Sakshi Malik returns home from Rio to grand welcome!
- Eurozone business activity strong despite Brexit: Survey
- India does not play for rankings, says Virat Kohli
- US backs Amnesty over India sedition case, says it respects group's right to express freely
- ''No Indian hand in Nepal government change''
- Daddy's little girl Priyanka Chopra remembers father on his third birth anniversary! See pic