Coral Bleaching Coral reefs are the most biodiverse ecosystem on the planet. There are more than 25,000 known species of organisms and countless others that have yet to be identified (Helvarg, 2000). Reefs thrive on the shallow edge of tropical seas, most often on the eastern edge of continents along warm water currents that brush the coasts. Reefs cannot live in cold waters and are limited by ocean depth and available sunlight. Coral is the foundation of the reef community, providing a three-dimensional structure where thousands of species of vertebrates and invertebrates live and feed. Some species of coral are hard, while others soft. Some are branched, yet others are compact and rounded. Coral is made up of large communities of tiny jellyfish like polyps. These polyps absorb calcium from the sea water and secrete a hard limestone skeleton. At night the polyps extend sticky, stinging tentacles from their skeletons to capture and consume small floating organisms such as zooplankton. Every coral has a two-stage life cycle: the larva, and the polyp. The larval stage is free swimming, and the polyp is stationary. Ocean currents carry the larva from the stationary parent polyp to any hard, clean, silt-free surface where, if the conditions are perfect, the larva grows into a coral forming polyp, never to move again (Levin, 1999). One of the most valuable resources for coral polyps are algae. Some live on the coral skeletons, but one type in particular, zooxanthellae, lives inside the tissue of the polyps. Zooxanthellae makes up about half the weight of the fleshy polyps and are not only a valuable food resource, but they are responsible for the brilliant colors associated with coral. When coral looses these prec... ... middle of paper ... ... as Helvarg (2000), Winiarski (19998) and Warrick (1999) have the benefit of being able to describe what coral bleaching is and it’s probable causes in a much more concise and to-the-point fashion. Bibliography: References Gates, R.D., and Edmunds, P.J. 1999. The Physiological Mechanisms of Acclimatization in Tropical Reef Corals. American Zoologist; Vol. 39, No. 1 (Feb. 1999), pp. 30-43. Huppert, A., and Stone, L. 1998. Chaos in the Pacific’s Coral Reef Bleaching Cycle. The American Naturalist; Vol. 152, No. 3 (Sept. 1998), pp. 447-459. Levin, T. 1999. To Save a Reef. National Wildlife; Vol. 37, No. 2 (Feb./Mar. 1999), pp. 20-29. Warrick, J. 1999. Warm Weather Destroyed Corals in ’98, Report Says. Houston Chronicle; March 8, 1999, p. 6. Winiarski, K. 1998. Coral in Peril as Reefs Suffer Worldwide. USA Today; October 19, 1998, p. 04A.
Sweatman, H, Delean, S, & Syms, C 2011, 'Assessing loss of coral cover on Australia's Great Barrier Reef over two decades, with implications for longer-term trends', Coral Reefs, 30, 2, p. 521-531, Scopus®, EBSCOhost, viewed 28 April 2014.
Earth, an endless source of wonder and beauty, produced the Great Barrier Reef. Hustling and bustling, the Reef thrives like a busy city, teeming with life. Sheltering thousands, corals, maintain the well-being of the Reef; however, the world threatens its nature and delicacy. Populations growing and technological advances increasing, the world becomes more and more disconnected with the natural world, posing an alarming risk for the planet we live on. Although many organizations try to keep the oceans clean, because of human interference and unnatural occurrences, the Great Barrier Reef needs scientific help to adapt corals to new conditions for means of survival, putting pressure on the Australian government to save their ocean environment.
Climate change has been affecting coral reefs in a negative way. If the climate continues to get warmer more of our coral reef become bleached, the structure of the reefs will become weak, and algae that keeps coral healthy will die. In the essay, “A framework for understanding Climate change impacts on Coral Reefs” by Joshua Clinner (2016), he emphasizes our climate change has become one of the long-term threats to coral reef. The article “Climate change and human impacts are damaging the world’s coral reefs”, which didn’t include an author (2001), states that the sea temperatures throughout the tropics has increased dramatically leaving much of the coral unhealthy. Spencer Hall (2008), discussed in his article “Coral Reefs and Climate Change”, how the increase in climate change puts a lot of stress on coral reefs because they are very sensitive to the change of temperature. Rigel B (2003) states in his essay, “Climate Change and Coral Reefs”, that coral reef has already been negatively impacted by
Leading scientists advise climate change will cause increases to the frequency and intensity of extreme weather events. Rising sea levels pose a significant risk to coastal communities, while the world’s oceans could become too acidic to support coral reefs and other calcifying marine organisms. Coral reefs contain only six per cent of the area of the Great Barrier Reef, yet they provide critical habitat and food for numerous species in the ecosystem. However, climate change has already impacted coral reefs in the Great Barrier Reef as corals are very helpless against its potential impacts. Eight mass coral bleaching events has occurred since 1979, triggered by unusually high water temperatures. And because of this, zooxanthellae (photosynthetic algae) leave their tissues and corals will have no more colours hence ‘bleaching’. Without the zooxanthellae, the corals that remain gradually starve to death. Once the coral dies, fish and a multitude of other marine species are soon affected. Rising sea levels and more frequent and intense storm surges will see more erosion of Australia’s coastline, causing community and residential
This event resulted in an outbreak of coral disease and macro algae, ultimately reducing reef quality.
All over the world coral reefs play an important part in our environment. Not only are the reefs colorful and beautiful to look at but the coral reefs house several different types of fish and other sea creatures. Coral reefs have started to decline over the years due to “climate change, El Nino events, overfishing, pollution and other pressures” (Newnham 1). A healthy coral reef can also collapse due to a natural disaster (Newnham 2). There can be several different reasons why a coral reef has started to decline or has been destroyed.
Coral reefs around the world are in danger. One of the causes is global warming, which has been increasing the temperature of the ocean water resulting in coral bleaching. This essay will focus on damage occurring to the Great Barrier Reef.
Anyone who’s ever scuba dived at a coral reef and seen the perfect handprint of dead coral can appreciate how fragile and delicate this ecosystem is.
Oceans cover 71% of the earth’s surface. The talk of climate change can often seem to focus on what is happening in our atmosphere, but there is a lot of change going on in our oceans. The oceans have absorbed 90% of the excess heat and 28% of the carbon pollution generated by human consumption of fossil fuels (Nuccitelli 2015). The purpose of this paper is to show how the effects of climate change affect the coral reefs in our oceans, with a focus on the coral reef systems in the Caribbean and the Great Barrier Reef. The Caribbean coral reefs are well known to have suffered more damage between the two reef systems.
Baker, Andrew c. “Climate change and coral reef bleaching: An ecological assessment of long-Term impacts, recovery trends and future outlook.” Estuarine, Coastal and Shelf Science, Academic Press, 17 Sept. 2008, www.sciencedirect.com/science/article/pii/S0272771408003405.
Additionally, coral reefs are a critical environmental resource. Often referred to as the “rainforests of the sea,” reefs are some of the most diverse and productive ecosystems on earth. Reefs are home to a diversity of plant life, providing a wealth of food for fish. As they do with shoreline, reefs shelter marine life from waves and storms. Due to their unique ecological properties, coral reefs “support more species per unit area than any other marine environment.” But these ecosy...
According to Dustan, “Since the late 1970s, reefs across the world have been dying at an unprecedented rate, and it only seems to be getting worse. Dustan points out that in the Florida Keys alone extensive reef monitoring studies conducted by the EPA and other agencies have shown that the reefs lost more than 38% of their living coral cover from 1996 to 1999. Carysfort Reef lost over 90% of its coral cover from 1974 to 1999.” The Global Coral Reef Monitoring Network, the single largest coral reef monitoring effort in the world, reported in October 2000 at the 9th International Coral Reef Symposium in Bali, Indonesia, that of all the reefs they monitor worldwide, 27 percent have been lost and another 32 percent could be lost in the next 20-30 years (Pockley 2000).
Population growth and development has altered the coral reef environment. Destructive fishing practices, land-based sources of pollution such as agricultural runoff, and excessive coastal development all have detrimental effects on delicate reefs. Global warming due to increased concentrations of greenhouse gases may result in sea-level rise and higher ocean temperatures, both of which have the potential to be destructive to coral reefs. In Florida, living animals whose skeletons make up the foundation of the multi-colored underwater reefs, corals are an important part of the aquatic ecosystem. Florida's coast has the only living coral reefs in the continental United States. These ancient, slow-growing structures are now imperiled by their own enormous popularity. Boat anchors and groundings, heavy use by divers and snorkelers, and pollution all cause damage to the reefs. (Grigs, 1997).
Located in tropical ocean waters, coral reefs provide priceless resources to both human and marine life. The leading natural cause of destruction among the coral reefs is global warming. Other natural causes are earthquakes, hurricanes, cyclones, and typhoons. The destruction to the coral reefs from these natural disasters is minimal compared to the dangers caused by man. Man-made destruction has a much wider impact on the health of the coral reefs. This destruction includes over-fishing, damage from anchors, aquarium industry, overgrowth of seaweed, and being smothered by sediments.
Coral reefs need to be preserved for many reasons. In this paper, I will discuss a few of them. First of all, they house a collection of diverse organisms, and contribute to fisheries which provide food items such as fish, crustaceans, and mollusks. Furthermore, coral skeletons are being used as bone substitutes in reconstructive bone surgery and may be able to provide important medicine, including anti-cancer drugs and a compound that blocks ultra-violet rays, they even help reduce global warming by taking carbon dioxide out of the air. These reefs provide a habitat for many species.