Sunday, November 27, 2011

Ocean Life Faces Tough Times

A plastic shopping bag, plastic cup and disposable nappy can take up to 20, 50 and 450 years respectively to breakdown in the ocean. 

Coupled with pollution, the oceans also face over-fishing and global warming.

According to a report released by KZN Ezemvelo Wildlife, 336 marine birds and animals were found entangled in debris last year. The animals also ingest cigarette butts and lighters, fishing lines, and other items which eventually kill them.

A new report released by the World Wildlife Fund South Africa (WWF-SA), says that marine resources, including commercial species such as rock lobster and yellowfin tuna, are overexploited.
Marine protected areas play a critical role in supporting marine ecosystems. And, according to the WWF-SA report, only 20 percent of South Africa’s coastline is protected, while only 0.1 percent of the world’s oceans are formally protected.

“Recent studies have shown that effective management and science-based decision making can set the stage for ecological recovery,” said Dr Morné du Plessis, CEO of WWF-SA.

According to Ezemvelo’s report, the ocean is very vulnerable to climate change. Excess carbon dioxide is causing them to become warmer and more acidic, harming plant and animal life.

Larger sea animals, such as dolphins, whales and sharks, will be affected by global warming, as the plants and animals they feed on will most likely move with the altering sea temperature.

The loss of ice in the Arctic means that whales, such as humpbacks and blue whales, may have to migrate further to reach feeding grounds. These longer migrations will exhaust these animals, and allow them less time for feeding, eventually affecting their reproductive rates.

Climate change is affecting the ratio of male to female animals, such is the case with sea turtles. 

Unusually warm temperatures are disrupting the normal ratios, resulting in a decline of male offspring.

Global warming has even reached coral reefs on the ocean beds. Corals rely on the algae living inside them to provide them with food. If the sea temperature becomes too high, algae will die, leaving the coral starved. According to the WWF, about one quarter of coral reefs worldwide is considered damaged beyond repair.

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