Coral Bleaching In Hawaii

Corals dislike warm water about as much as acidity. When oceans get typically warm, corals can eject the algae that symbiotically live in their skeletons, providing food in exchange for shelter. The ejection process is called bleaching, named by the white skeleton left behind when the coral gets sick and, in some cases, dies.

Elevated sea temperatures caused by climate change and extra-bright sunlight can result in coral bleaching. As the water gets warmer, corals will expel the algae known as zooxanthellae that lives in their tissues causing the coral to turn completely white. When temperatures drop, the corals can recover, but they might be vulnerable to disease and when

Coral reefs are found in shallow tropical waters along the shores of islands and continents. Coral bleaching is a topic that gets left in the dust. Not many people really pay attention or show much interest in it. Widespread bleaching, involving major coral reef regions and resulting in mass coral mortality has raised concerns about linkage of the events to global phenomenons including global warming or climate change and increased UV radiation from ozone depletion. Corals provide a lot not just for us humans but for marine life as well. Marine Biology provides information about how bleaching happens and how it affects the coral. Buchheims’ article is full of logos and a few pathos while the other source is full of ethos. In The Nature Conservancy’s director Stephanie Wear provides us with lots of professional opinions

Coral bleaching is normally characterized by the expulsion of the zooxanthellae algae, loss of algal pigmentation, or both. Coral bleaching events have had serious effects on corals and reefs worldwide. What is crucial to the understanding of zooxanthellae expulsion and bleaching is how the density of zooxanthellae within the coral is changing, if at all, under the prevailing range of environmental conditions (Gates and Edmunds, 1999). Over the last twenty years, there has been a dramatic increase in both the frequency and intensity of coral bleaching events. Sixty major bleaching events have been reported between 1960 and 1979, whereas only nine were reported prior to 1979 (Huppert and Stone, 1998). Given the dependence of the coral on this symbiotic algae, it is important to determine the cause of these bleaching events. According to Helvarg (2000, p.12):

Coral bleaching usually occurs when the surface of a sea with coral in it becomes too warm for the coral. When the water heats to as little as one degree higher than normal, coral expels the algae living in its tissue, which causes it to turn completely white. The rise in temperature of the sea surface has been linked mainly to global warming. Other causes of coral bleaching include oxygen starvation caused by an increase in zooplankton, increased solar irradiance, increased sedimentation, bacterial infections, changes in salinity, herbicides, low tide and exposure, cyanide fishing and elevated sea levels. Bleaching events in 2016 were unprecedented, nearly 90% of the coral in the Great

The impacts that climate change has on coral reefs is very concerning. The increase in sea temperatures is causing the coral reefs to become bleached. When a coral becomes bleached it causes them to expel the algae, leaving the corals white. Bleached corals results in many negative effects. When a coral is bleached they have reduced growth rates, the species that depend on them are affected, and there is a decline in coral reef protection from shorelines. The devastating impacts that climate change has on coral reefs are unpredictable to the sea and the ecosystem. It is a very unfortunate event that the rise in sea temperatures are causing these devastating impacts on coral reefs.

The purpose of this research is to apply the knowledge learned about the ecology of the Hawaiian Coral Reef to a real-life situation. The coral reef stretches over 1,000 miles in the Pacific Ocean. In the Pacific Ocean, near the 124 islands of Hawaii, is the Hawaiian Coral Reef, which covers nearly 1,200 miles. Out of all the coral reefs in the world, the Hawaiian reef consists of 85% of all reefs. Coral Reefs are made of organisms, coral, and limestone skeletons. 25% of organisms are not existent anywhere else in the world. Abiotic factors are nonliving things, and abiotic factors of a coral reef are depth, light, wave motion, salinity, and temperature of the ocean. Biotic factors, living factors, is the whole coral reef,

The Barrier Reef is the largest reef in the world, and it is located in Australia. It is made up of different types of coral and fish, but sadly the reef is bleaching. Bleaching is the process of water temperatures getting too warm and as a result coral reefs can bleach. When water gets too warm, corals will get rid of the algae living inside their tissues causing the coral to turn completely white. Although, when coral reefs turn white this does not mean that they are dead, coral reefs can actually survive a bleaching event. It just means that the coral is under a lot of stress and

The state of Hawaii and its islands are role models for the nation and world when it comes to protection of ecological and biological resources. From establishments of protection of at least 20% of U.S. Coral reefs and associated habitat types in no-take areas, to working with local, governmental and global stakeholders to amend treaties and Acts that the nation can involve in. Currently, there are 43 sites considered marine protected areas and 12 of these are no-take zones. Papahãnaumokuãkea Marine National Monument is one of these.

as they begin to reject the tiny plants that soak up the sun and give the coral

Change in ocean Temperature: increased ocean temperature drastically caused by climate change is the leading cause of coral bleaching.

A hypothesis created by a group of scientists determined that the cause for bleaching was due to stress (Brown and Ogden). This stress is closely linked to salinity changes, exposure to ultraviolet radiation in excessive amounts, huge climate changes and most importantly the increase in warm waters (Douglas ). Corals can survive in water that is between 25˚ and 29˚C. Any water temperature above that will result in the death of algae (Brown and Ogden). High ocean temperatures mixed with solar radiation are attributed to current large-scale bleaching events leading to global climate change, such as El Niño (Douglas ).

Coral reefs are threatened by global warming. They can only live in waters between 18 C and 30 C. Therefore, with the increase in temperature of the surrounding water, there has been an unprecedented increase in the number of coral bleaching events during the past 2 decades (which have had some of the warmest years in history). When ocean temperatures get too high, coral polyps lose the symbiotic algae inside them, causing them to turn white, or "bleach," and eventually die.

Elevated sea temperatures are the primary cause of mass coral bleaching events. Bleaching is a stress replication of corals, during which they expel their zooxanthellae during unpropitious conditions, giving elevate to the typical white coloration observed. Aside from temperature, other stressors such as tropical cyclones, freshwater inflows and anthropogenic pollution can additionally induce bleaching but to a far lesser extent and generally not on immensely colossal spatial scales.

Coral reefs contain symbiotic algae called zooxanthellae which gives the coral its healthy brownish color. The algae "utilizes sunlight and the coral animal's respired CO2 to produce energy rich compounds that feed the coral host" (AIMS, 2003). When stress factors such as "heat, solar radiation, pollution, reduced salinity and changes in oxygenation" occur around the coral, bleaching can begin (Dennis). When bleaching occurs, the algae, which create nutrients for the coral to feed from, is released due to stresses to the reef. Thus the coral starves and its white calcium carbonate skeleton of the coral becomes visible (AIMS, 2003). But one of the main stresses that contributes to the lifeless white appearance of the coral is the warmer temperatures of the sea surface water.