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The Essentials Of A Home Surveillance System January 18 Dejounte Murray Spurs Jersey , 2014 | Author: Jolanda Tennille | Posted in Business
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Security cameras are usually placed just outside the front gate or somewhere near the doorstep so that the homeowner can easily tell who is knocking on the door before opening it. If you’re sleeping in the middle of the night and you hear some strange noises in your yard Bruce Bowen Spurs Jersey , you can simply check on the screen what or who is causing the disturbance.

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SAN FRANCISCO, June 11 (Xinhua) -- A new study has suggested that the widespread coral deaths in recent decades are being caused by a combination of multiple local stressors, such as overfishing, nutrient pollution, and pathogenic disease, and global warming.

Based on an experiment that simulated both overfishing and nutrient pollution on a coral reef in the Florida Keys in the southeastern United States over three years, which was one of the longest and largest field experiments of the kind, researchers from six institutions concluded that coral reefs are declining around the world due to these factors.

In a study published this week in Nature Communications, they wrote that these forces greatly weaken corals, allow opportunistic pathogens to build to such levels that corals cannot survive, and a global decline of coral reefs is now reaching catastrophic proportions.

Major findings of the study include:

-- Overfishing, nutrient pollution and increased temperature all lead to an increase in pathogens;

-- Direct algal contact driven by overfishing and nutrient pollution destabilizes the coral microbiome, in some cases leading to a 6- to 9-time increase in mortality;

-- Heat exacerbates these problems, with 80 percent of coral deaths coming in the summer or fall, but only when fish are removed or nutrient pollution is present;

-- In a distressed system with many algae, coral disease levels double and coral mortality increases eight times;

-- Increased algal cover or elevated temperature can reduce levels of naturally-secreted antibiotics that help protect corals from harmful bacteria.

These findings, researchers said, make it clear that in the face of global warming, some of the best opportunities to protect coral reefs lie in careful management of fishing and protection of water quality. This would give corals their best chance to have a healthy microbiome and resist warmer conditions without dying.

"This is grim news, but at least it will help settle the argument over why corals are dying," said Rebecca-Vega Thurber, an assistant professor in the College of Science at Oregon State University and corresponding author on the study.

"This makes it clear there's no single force that's causing such widespread coral deaths," she said. "Loss of fish that help remove algae, or the addition of excess nutrients like those in fertilizers, can cause algal growth on reefs. This changes th.

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