Archive for August, 2015
Sharks, No Evolutionary Forerunner
Sharks get a bad rap. With only a cartilaginous skeleton, sharks were once thought to be the primitive evolutionary forerunner of the fish originating more than 400 million years ago during the Paleozoic Era―yet, somehow surviving unchanged. Sharks suffer from misconceived stereotyping as dangerous indiscriminate killers surviving purely by unintelligent deadly instinct.
A new study on the migratory patterns of the tiger shark, Galeocerdo cuvier, published in Nature, however, further dispels these misconceptions. For the first time using satellite-tracking technology, an international research team lead by James Lea of the Guy Harvey Research Institute in Florida, documents the previously unknown extraordinary long-distance annual movements of the tiger shark between completely different types of environments in the Atlantic Ocean. Tiger sharks prove to be no evolutionary forerunner of the fish. Continue Reading