Sunday, October 17, 2010
While looking for scientific articles about sharks on-line I discovered scientific research concerning Great White Sharks. To be more specific,this research has to do with Great White sharks which live off the waters of California USA.
Researchers have long thought that white sharks migrated across oceans, but a new study in the Proceedings of the Royal Society B shows that the population in the northeastern Pacific Ocean, along California, hasn't mixed with other white sharks for tens of thousands of years!!
"White sharks are a large, highly mobile species," said Salvador Jorgensen, a postdoctoral scholar at Stanford's Hopkins Marine Station. "They can go just about anywhere they want in the ocean, so it's really surprising that their migratory behaviors lead to the formation of isolated populations."
At the newsmongobay.com website I found an article written by Jeremy Hance, entitled, "California's great white sharks are a distinct population", which was published on November 4,2009.
In the article Mr.Nance states:
"Employing satellite tapping, passive acoustic monitoring, and genetic tags, researchers with the Tagging of Pacific Predators (TOPP) found that the white shark (Carcharodon carcharias) in northeastern Pacific frequently return to the same spot over and over, and sometimes remain in one hunting ground for over a hundred days."
"The sharks were detected frequently at their chosen site," Jorgensen said, "which means that they are patrolling around there nearly constantly, for long periods of time. They will occasionally visit one of the adjacent sites, but they always come back."
"They also never stray far. Genetic studies show that the population of northeastern Pacific white sharks was likely founded by a small number of sharks sometime in the last 200,000 years and hasn't mixed with other shark populations near Australia and South Africa since."
This is amazing to me,seeing as you would think that great whites would be migrating to different ocean regions based upon the availability of food sources.
"If you had asked us a few years ago, we would have said white sharks found in California probably migrated throughout the Pacific. Now, even though we know they travel great distances, their paths are surprisingly constrained to specific routes. This explains how a highly migratory marine species becomes a genetically isolated population. This also makes it much easier to appreciate how vulnerable the northeastern Pacific white shark population could become if too many individuals were taken as either catch or bycatch, since these sharks do not appear to interbreed with other shark populations," said Molecular geneticist Carol Reeb, a research associate at Stanford."
To read the entire article please click on the following link:
Hopefully this new research will help scientists better understand Great white sharks so that this understanding will enhance our ability to learn what human behaviors must be changed to ensure the survival of Great white sharks in the oceans of our planet! I wonder why these Great White sharks have not chosen to move elsewhere during their daily lives?
New research also shows that humans have underrated the cognitive abilities of sharks:
Source of image:http://theworldisshaking.blogspot.com/2010/10/unprecedented-great-white-shark.html
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Thoughts worth thinking about
Laws alone can not secure freedom of expression; in order that every woman and man present their views without penalty, there must be spirit of tolerance in the entire population.- Albert Einstein Too often we underestimate the power of a touch, a smile, a kind word, a listening ear, an honest compliment, or the smallest act of caring, all of which have the potential to turn a life around. - Leo Buscaglia
A person's true wealth is the good he or she does in the world. - Mohammed
Our task must be to free ourselves... by widening our circle of compassion to embrace all living creatures and the whole of nature and its beauty. -Albert Einstein
The best way to find yourself, is to lose yourself in the service of others. - Ghandi
The unselfish effort to bring cheer to others will be the beginning of a happier life for ourselves. - Helen Keller
Aim for success, not perfection. Never give up your right to be wrong, because then you will lose the ability to learn new things and move forward with your life. Remember that fear always lurks behind perfectionism. Confronting your fears and allowing yourself the right to be human can, paradoxically, make yourself a happier and more productive person. - Dr. David M. Burns
Life is as dear to a mute creature as it is to man. Just as one wants happiness and fears pain, just as one wants to live and not die, so do other creatures. -His Holiness The Dalai Lama
Mankind's true moral test, its fundamental test (which lies deeply buried from view), consists of its attitude towards those who are at its mercy: animals. And in this respect mankind has suffered a fundamental debacle, a debacle so fundamental that all others stem from it. -
Milan Kundera, The Unbearable Lightness of Being
The worst sin towards our fellow creatures is not to hate them, but to be indifferent to them. That's the essence of inhumanity. -George Bernard Shaw
Ego's trick is to make us lose sight of our interdependence. That kind of ego-thought gives us a perfect justification to look out only for ourselves. But that is far from the truth. In reality we all depend on each other and we have to help each other. The husband has to help his wife, the wife has to help the husband, the mother has to help her children, and the children are supposed to help the parents too, whether they want to or not.-Gehlek Rinpoche Source: "The Best Buddhist Writing 2005 pg. 165
The hostile attitude of conquering nature ignores the basic interdependence of all things and events---that the world beyond the skin is actually an extension of our own bodies---and will end in destroying the very environment from which we emerge and upon which our whole life depends.