The Iguape mangrove is dyingTuesday March 4th, 2014
The region of Iguape, Ilha and Cananea is one that provides the most caught seafood in São Paulo. This is because the site focuses more extensive area of mangroves in São Paulo, 15,193 ha of mangroves, the nursery of many marine species. As maternity, it provides shelter and food to species, helping them to develop. Currently, these species are at risk because the nurseries of Iguape are threatened by locally called “green icebergs”: aquatic plants freshwater. That was one of the adversities presented in the “Meeting: Climate Change and Coastal SP” in the first week of April, which is part of the Climate Change Project and the Future of Communities of the South Coast Paulista, developed by Green Initiative with the support of HSBC Institute Solidarity.
The problem is exposed in the eyes of anyone who walks by the municipality – or navigate – across the river Ribeira de Iguape. The mangrove islands are surrounded by aquatic plants freshwater. At its center, the mangrove forests are increasingly esmorecidas. “The macrophytes (aquatic plants) of fresh water are preventing the mangroves grow or remain as they float, do not fix sediment,” said the speaker of the meeting Marilia Lignon, a biologist who studies since 2000 measures and the mangroves of the region. No sediment (such as sand or clay), the forest seedlings can not find how to sign to grow. In addition, macrophytes like water with lots of organic matter that can result from sewage and also substances used in agriculture remains brought by water.
Remove macrophytes temporarily solve the problem. To preserve the mangroves should be cut it in the bud: discovering why the amount of fresh water has increased on site. After all, freshwater plants could not develop in such numbers if the salinity of the region were larger and thus they would be more guarded during global warming. “Global warming has as one of its consequences increase the annual average temperature, which may interfere with the reproductive cycles and salt balance mangrove sludge. If the mangrove is preserved during the event, the risk in changes in animal populations that depend on it will be lower, “says Fernanda Luccas, biologist PhD in environmental science at the University of São Paulo and speaker of the event.
According to Marilia, mangroves protect coastal areas in tropical regions with hot water. “They help in regulating the climate since the temperature inside them varies little; hold sediment; They are a barrier against typhoons and other events; and provide food, “says the researcher. South America has 11% of the world’s mangroves, and Brazil is the third country with more mangrove forest on the planet, with 7%. “The macrophytes not replace mangroves and they are fading in Iguape,” says Marilia. One way to reverse it is to take care of the environment.
“Climate change is a component to look at the environment with different eyes and not appropriating it,” said the speaker Humberto Rocha, a researcher at the Institute of Astronomy, Geophysics and Atmospheric Sciences at the University of São Paulo. “At a minimum, the discussion about climate change can cause improved how we treat the environment,” Roberto Resende, president of the Green Initiative.