Coral Can Recover from Climate Change Damage, New Research Suggests
ScienceDaily (Jan. 10, 2010) — A study by the University of Exeter provides the first evidence that coral reefs can recover from the devastating effects of climate change. Published Jan. 11,
Scientists and environmentalists have warned that coral reefs may not be able to recover from the damage caused by climate change and that these unique environments could soon be lost forever. Now, this research adds weight to the argument that reducing levels of fishing is a viable way of protecting the world's most delicate aquatic ecosystems.
Increases in ocean surface water temperatures subject coral reefs to stresses that lead quickly to mass bleaching. The problem is intensified by ocean acidification, which is also caused by increased CO2. This decreases the ability of corals to produce calcium carbonate (chalk), which is the material that reefs are made of.
Approximately 2% of the world's coral reefs are located within marine reserves, areas of the sea that are protected against potentially-damaging human activity, like dredging and fishing.
The researchers conducted surveys of ten sites inside and outside marine reserves of the Bahamas over 2.5 years. These reefs have been severely damaged by bleaching and then by hurricane Frances in the summer of 2004. At the beginning of the study, the reefs had an average of 7% coral cover. By the end of the project, coral cover in marine protected areas had increased by an average of 19%, while reefs in non-reserve sites showed no recovery.
Professor Peter Mumby of the University of Exeter said: "Coral reefs are the largest living structures on Earth and are home to the highest biodiversity on the planet. As a result of climate change, the environment that has enabled coral reefs to thrive for hundreds of thousands of years is changing too quickly for reefs to adapt.
"In order to protect reefs in the long-term we need radical action to reduce CO2 emissions. However, our research shows that local action to reduce the effects of fishing can contribute meaningfully to the fate of reefs. The reserve allowed the number of parrotfishes to increase and because parrotfish eat seaweeds, the corals could grow freely without being swamped by weeds. As a result, reefs inside the park were showing recovery whereas those with more seaweed were not. This sort of evidence may help persuade governments to reduce the fishing of key herbivores like parrotfishes and help reefs cope with the inevitable threats posed by climate change."
Professor Mumby's research was funded by National Environment Research Council (NERC) and the Khaled bin Sultan Living Oceans Foundation.
- A coral reef is made up of thin layers of calcium carbonate (limestone) secreted over thousands of years by billions of tiny soft bodied animals called coral polyps.
- Coral reefs are the world's most diverse marine ecosystems and are home to twenty-five percent of known marine species, including 4,000 species of fish, 700 species of coral and thousands of other plants and animals.
- Coral reefs have been on the planet for over 400 million years.
- The largest coral reef is the Great Barrier Reef, which stretches along the northeast coast of Australia, from the northern tip of Queensland, to just north of Bundaberg. At 2,300km long, it is the largest natural feature on Earth.
- Coral reefs occupy less than one quarter of one percent of the Earth's marine environment, yet they are home to more than a quarter of all known fish species.
- As well as supporting huge tourist industries, coral reefs protect shorelines from erosion and storm damage.
High quality reef videos by Professor Peter Mumby can be viewed at: www.reefvid.orgHere we are again ready to start work. Let´s face this last term with a bit of a hurry to finish the curriculum and with plenty of practice for the exams. i´ll ask you to do grammar exercises at home and we´ll solve the doubts in class.I prefer to devote our time in a very practical way.
Writing: St.b.p.49. "The place where I live" , a composition to describe your town. You had to do it for homework before I fell ill, so you must have it.
Grammar: Review of conditional I and warm up and activities of conditional II. We did some of the exercises to check to had caught the point. For homework ,finish thes exercises
Reading: St.B.p.66"Never smile at a Crocodile", areading and a quiz .
Listening: St.B.p. 66 an interview to a survival expert giving the right answers for the quiz.
Phonetics: St.B.p.66. Stree and rhythm with conditional II.
Vocabulary: Aninals in general. St.B.p. 151. Pronunciation of words, stress and matching exercise.
Speaking: St.B.p.67 . About pets and your opinion about animals. You just started the activity and we´ll carry on next Thursday.
Listening: St.B.p. 67. Which animal can you hear? An amusing activity with animals and their sounds.
Reading: St.B.p. 67. "Nature´s perfect Killing Machine", a passage about crocodiles in Australia and a true-false activity.
Homework: Finish the conditional exercises of the handout, hand me in the composition and Wk, unit 6B
Speaking: St.B.p. 71. A for and against debate about killing animals. . Ideas and structures to agree and disagree. we´ll have the debate next Monday.
Grammar: present perfect simple and continuous. This was the point where I stopped at the beginning of March. We started again with some theory and some exercises.
- Set 1
- Set 2
- Set 3
Vocabulary; St.B.p. 72. Word building dealing with the formation of nouns, verbs, adverbs and adjectives. Words to be classified under the right column and and a complete the sentences exercise.
Grammar: St.B.p. 74 Quantifiers. We only did the first activity as a warm up , then moved to the grammar and and saw chapters 86 and 86. I placed only emphasis on the new items. You should do theses exercises at home, check your answers with the key and ask me anything you don´t understand in class. It´s the fastest way taking into account that there´s no much time left for the exams.
Listening: ST.B.p. 74. "Childhood Memories". Listen to three people talking about incidents they remember from their childhood and choose the best adjective to describe how each person felt. The second time was with the script at sight.
Homework: For Monday the for and against debate. For thirsday Grammar, unit 86,87. The handouts about the present perfect simple and continuous and a reading St.B.p. 73
Pablo Gonzalez has asked me to play this song with the lyrics. Here you are.