The 5 articles I carefully selected are all articles relating to the science behind oxybenzone in the ocean, coral reefs in Hawaii, and the overall threat of sunscreen in the ocean. I searched within the DU library website for articles on just oxybenzone and filtered the results by selecting “Peer-reviewed Articles”. Combined I was able to describe oxybenzone, explained the causes of coral reef degradation and bleaching, and the impact of oxybenzone on corals. Below is the results of the important points I found in the 5 sources. Oxybenzone is an ultraviolet filtering chemical commonly found in personal care products, like lotions and sunscreens (Bratkovics , Wirth and Sapozhnikova 2015). It filters UV light, which protects the human skin …show more content…
Hawai’i is a prime example of an area that is strongly affected by this growing issue. One of the main reasons why Hawai’i is such a popular destination is because of its beautiful coral reefs and marine life, but with the increase of tourism, coastal beaches and popular snorkel destinations are becoming saturated with contaminants that come from sunscreen and other personal care products used by …show more content…
Coral bleaching acquired its name from the white color the corals turn after the zooxanthellae leave its host. Zooxanthellae play a vital role for corals by supplying them with photosynthetic products, which are important to their survival and it also gives the coral its color. Over the past several decades the temperature of Hawaiian waters have increased and caused several bleaching events throughout the islands. Aside from temperature changes, bleaching events can be cause by random changes in the environment, which include but are not limited to, an increase or decrease of irradiance, altered quality in the visible range, altered spectral quality in the ultraviolet radiation range, low salinity, sedimentation, infectious diseases, oil contamination, and exposure to toxic materials (Jokiel and Brown 2004). In the case of oxybenzone, corals are most likely being affected by the exposure of toxic materials and, because oxybenzone normally accumulates in the surface of the water, UV radiation range and irradiance decrease. The accumulation of the chemical in the surface can create a barrier that blocks some of the UV light from getting to the corals, which then decreases irradiance and radiation
These applications include pesticide, herbicide, defoliating agent such as Agent Orange, cleaning agent and electrical insulation. Consequently, human exposure to dioxin is not a recent phenomenon and the dangers of dioxin are not unknown. Only in recent years, especially after the Vietnam War, has the media concentrated on the dangers and impact of dioxin. The physical effect of exposure to dioxin was first seen in skin diseases developed by chemical plant workers in 1895. Exposure to dioxin results in a type of skin disease like acne called "chloroacne," since its cause was initially and incorrectly linked to chlorine gas.
Joe, Brancatelli. "What Is Polluting Our Beaches?" Popular Science 1 Mar. 2003. Database. 23 Oct. 2005.
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
Coral bleaching is when the tiny algae that lives in the coral which causes it to be bright and colourful, gets so stressed out when the water temperature exceeds the limit that it can handle, which then makes the algae
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.
Coral Reefs are said to be the “tropical rainforest” of the sea. They are home to over 25% of all marine life (http://coralreefalliance.org.stories/storyReader$77). Over the past few decades they have been subjected to destructive anthropogenic practices. Some of the major threats to coral reefs include sedimentation, water pollution, harmful recreational activities, and global warming. All of these things cause stress on corals and can potentially cause mortality. Corals are made up of two parts, a polyp and zooxanthellae. A polyp is a calcerous body that grows from a hard part of the ocean floor. Zooxanthellae is a photosynthetic algae which lives in the polyp and provide energy for themselves and the coral. In many cases, corals undergo “bleaching,” which is a process where corals lose the zooxantheallae or chlorophyll pigment, and turn white (Wilkinson et all). After bleaching corals can survive for several months. It is possible for corals to recover by hosting more zooxantheallae, but it can take between 5 and 50 years for them to recover completely (Wilkinson et all, 1999).
Coral bleaching is the loss of a corals’ zooxanthellae that lives in the tissues of the coral and because of this loss the corals turn completely white. Coral bleaching is mostly caused by the warm temperatures of the water which means that climate change can have an effect on the coral reefs. Corals live in very nutrient poor waters and have certain zones of tolerance to water temperature, salinity, UV radiation, opacity, and nutrient quantities (Jason Buchheim). Because most coral reefs are found in clear, shallow tropical waters, light is able to pass through and heat up the water and coral beneath it. Most reef-building corals normally contain around 1-5 x 106 zooxanthellae cm-2 of live surface tissue and 2-10 pg of chlorophyll a per zooxanthella. When corals bleach they commonly lose 60-90% of their zooxanthellae and each zooxanthella may lose 50-80% of its photosynthetic pigments (Jason Buchheim). Because of climate change, the water temperatures change in various locations and regions of the world that may not be used to that certain type of climate. Areas with coral reefs are affected by ...
Coral bleaching is exactly what you're envisioning now in your head, white bleached out coral reefs which is far different from the colorful lively structures you're used to. Corals get their brilliant
Rates of coral calcification on the Great Barrier Reef and many other reef systems around the world have declined by 15-20% since 1990 due to increasing thermal stress (De’ath 2012). It has already been mentioned that the oceans absorb almost all of the excess heat from climate change. This affects coral reef systems in what is known as coral bleaching. The term bleaching refers to the loss of corals’ colors. A coral’s color is the result of the zooxanthellae present.
This website gives a large historical overlook and possible conclusion to the issue of coral reef bleaching. Since the 1980’s episodes of coral reef bleaching and death have occurred almost every year in one or more of the world's tropical or subtropical seas. Bleaching happens in episodes, with the most severe typically accompanying coupled ocean–atmosphere phenomena. Bleaching episodes have resulted in loss of coral
Think of marine chemistry as a balance. Both sides of the balance need just the right weight to maintain equilibrium. Now imagine the weights on each side of the balance are variables such as nutrients and that the balance itself is the ocean. If there is too much of one nutrient, the balance tips too far one way, therefore causing the chemistry of the ocean to be thrown off. The chemistry of the ocean is what drives its overall function. If there is too much of one thing or too little of another, the ocean ceases to function properly. One major factor that tips the oceans chemical balance is human activity.
The leading natural cause of destruction among the coral reefs is global warming. Global warming causes the bleaching of coral reefs to occur. Bleaching is a response to stress by the coral reef that happens when the water becomes to warm. The coral then put out a brownish zooxanthelle which causes them to lose their color. Without the zooxanthelle, the corals cannot provide nourishment for itself and th...
The oceans need to be protected because it is where life began and if not taken care of, life as we know it will end. When dangerous substances go into the ocean, ecosystems are suffer and become endangered along with lives of people and of marine life. Surfrider Foundation recognizes the importance of protecting and preserving the quality and biodiversity of the world's coasts because they are truly irreplaceable. There is also historical evidence of ocean pollution being present in the past, but the problem still lingers today. Heal the Bay discovered that,“Did you know there is a DDT and PCB hot spot off the coast of Palos Verdes? This superfund site (which indicates it's one of the most polluted places in the United States), is left over from a 1930's era chemical plant. Because DDT takes so long to break down in the marine environment, it persists to this day, contaminating certain species of fish. There are also highly polluted sediments in the Long Beach area, a sign of the heavy shipping in the port. Heal the Bay works on developing effective capping and removal plans to keep those toxins from spreading” (Heal the Bay). DDT is still highly concentrated in the South Bay area and still contaminating different species of fish. Even after more than 80 years DDT, a toxic insecticide, is still very concentrated and during upwellings, DDT particles come back up and continue to harm marine life. If humans are careless about what is thrown on the floor or sprayed on lawns, it can lead to disastrous affects when it comes to the condition of the ocean's ecosystems, and can endanger life itself leading to a problem that only we can mend.
Coral Reefs need to be preserved for many reasons. In this paper I will discuss a
People from all over the world go to beautiful beaches that are filled with water as clear as ice or as beautiful as diamonds. But, what will happen if we do not conserve the appealing sites that draw attraction to the public? Contaminated beaches has become a controversial issue to the public because of the causal problem, the harm to the people and marine animals, the government agencies supporting or opposing pollution, and the industries involved in creating such unlawful decisions. To create and find a solution, we must first find the core to the problem.