Aaron MacNeil, a biologist at Dalhousie University, and colleagues set out more than 15,000 baited camera traps, and the local snapshots provided by each revealed that species such as grey reef sharks, blacktip reef sharks, and Caribbean reef sharks were often missing from reefs in which they historically lived.”Having dived in hundreds of places around the world, from pristine to degraded, it was no surprise that a fifth of the reefs surveyed had no sharks,” says Sala, who founded the Pristine Seas initiative in 2008 to conserve the world’s oceans. (Read how the world’s coral reefs are dying.)And even in places where reef sharks can still be found, Sala adds, their numbers have been so reduced that they’re no longer playing the same ecological roles as predators. Who was not involved with the research, notes that while the camera trapping approach “is tried and tested at local scales, this study has effectively coordinated a global assessment.””Sharks are easily overfished,” Graham agrees, calling them “a rare occurrence when diving in many nations.”‘You can only sell a dead shark once’Two thirds of the world’s 500 shark species are threatened by overfishing, often to meet demand for shark meat and fins, while nets and longline fishing equipment that unintentionally trap sharks have also severely diminished their numbers.But there is still some hope for sharks.
Mark Torregrossa has been the chief meteorologist for three television news stations in Michigan. A resident of the state for 20 years, he has also gardened since the age of ten and is an avid hunter. The material on this site may not be reproduced, distributed, transmitted, cached or otherwise used, except with the prior written permission of Advance Local..
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The thermo mechanical fatigue (TMF) of power plant components is caused by the cyclic operation of power plant due to startup and shutdown processes and due to the fluctuation of demand in daily operation. Thus, a time dependent plasticity model is required in order to simulate the component response under cyclic thermo mechanical loading. The overall aim behind this study is to develop a material constitutive model, which can predict the creep and cyclic loading behaviour at high temperature environment, based on the cyclic loading test data of the P91 and the P92 steels.The tests on all specimens in the study were performed using the Instron 8862 TMF machine system with a temperature uniformity of less than 10C within the gauge section of the specimen.