The Symbiotic Relationship With Coral Reefs

In this episode of the BBC Documentary series, “The Blue Planet: Coral Sea” examines the roles and effects of coral reefs on other marine species. Coral reefs play a major part in the marine food web since they are responsible for about one quarter of all ocean species. Coral reefs are one of the most diversified species in the marine, even though they only covered a tiny portion of the earth. This species can reproduce both asexual and sexual. In sexual reproduction, larva is developed through egg and sperm fertilization. On the other hand in asexual reproduction, they can clone themselves through budding or fragmentation. Coral reefs, however, has been threatening due to overfishing, pollution, climate change, increasing in ocean acidity

What they did find out was at the Great Barrier Reefs up to the year 2005 was there was a decline of 14% between the years of the early 1990’s and 2005. During that time larvae started to get affected by the problem but not the adults. Another thing I found out was that Ocean Acidification has been known to slow calcification rates in microalgae which is important in the ecosystem for coral reefs. Individual reef building species are very vulnerable to dissolution under increasing CO2 concentrations which leaves them with no ability to adapt. A common coralline algae from the Mediterranean Sea did not show a strong calcification response as long as the algae was living and it only decreased with the temperature raised. Calcifying green algae in Halimeda and Penicillus produced a large volume of sand and mud im the reef settings. The Halimeda meadows could grow faster, banks can grow bigger, and its easier to spread on the tropical

Global temperatures are steadily rising due to anthropogenic causes; this increase in temperature is causing changes to ocean properties that can impact the organisms that call this medium their home. One of the most evident impacts of climate change on the world’s oceans is the resulting raise in ocean surface temperatures. Rising ocean temperatures can directly affect biogenic reef building organisms like corals which produce some of the most diverse and productive ecosystems in the world. Previous studies within this field have determined that climate change is a notable stressor for these corals causing large scale bleaching events; where they release their photosynthetic symbionts. Once the symbionts of these organisms are released corals begin to starve and ultimately die resulting in

The ocean is two-thirds of our planet a vast blue landscape home to many biomes which according to Boyce Thorne-Miller “(ecosystem types) corresponding to sets of environmental conditions that vary with depth, latitude, and longitude” (16). However, the ocean and its biomes is under attack from the changing environment. We can see this through coral reef biomes as they make their home near the shores. Through coral reefs we can view the effects that these changes have on the ocean through how the coral reef biome is affected. Humans are a danger to the coral reefs and the wildlife that resides in the biome. The pollution being released into the environment is poisoning the coral and causes death and malformation to the wildlife. The ocean is changing due to global warming which is causing a change in the temperature and rising water levels leading to a change in the stabile areas coral can survive. The increasing acidification of the ocean is causing the coral reefs to die. I will be looking at the effects these issues cause to coral reefs biomes and the ocean to see the similarities in how they affect both.

Coral reefs exist all over the world and are generally known as being one of the most diverse, intricate and beautiful of all existing marine habitats. They have many varying structures which are developed by algae and are symbiotic with various reef building corals which are referred to as, zooxanthellae (algae). There are many other factors such as, coralline algae, sponges and other various organisms that are combined with a number of cementation processes which also contribute to reef growth, (CORAL REEFS, 2015).

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):

Since early 1998, climate change has been demonstrating its effects in increasing the ocean 's temperature (West & Salm, 2003). Warm water stress corals causing the phenomenon known as coral bleaching, by which expulsion of colourful symbiotic algae the zooxanthellae, vital for

“Unusually high water temperatures have caused many coral species to lose their zooxanthellae, turn white, and die prematurely, thereby leading to a decline in reef building. Scientists predict bleaching will reduce diversity among corals and the creatures that depend on them” (“Great” World Book). Additionally, changes in the salinity of the water affects the Great Barrier Reef. Salinity is changing because of changes in climate. This is because warmer air from climate change can absorb more water than cooler air, therefore changing evaporation cycles. In places where there is more rainfall than evaporation, rainfall is increasing. In places where evaporation exceeds rainfall, evaporation is increasing. This process is widening the gap between humid and arid regions. This proves to scientists that climate change is affecting salinity (Calif). Furthermore, diseases are produced among coral because of climate change as well as pollution. Increasing temperatures are so effective on the reef that the only disease that can be treated is black-band disease (“Coral”). Ultimately, the coral in the Great Barrier Reef becomes brittle and pale because of these

Developing organizations, such as The Ocean Agency and the Coral Restoration Foundation, have been raising concern in efforts to conserve and furthermore sustain aquatic life and the ecosystem in which they inhabit. These unique fish, found living and populating among the coral reef, face a level of degradation and life threatening obstacles. The coral reef acts as a home to more than a quarter of the know fish species, where their population and species have been widely studied. This ecosystem is a beautiful representation of life which supports, and is supported by other neighboring ecosystems; embodying a significance as the leading consumer item for those who live along the reefs. Their importance to our planets collective ecosystem is not fully understood, due to the way these ecosystems are interconnected to one another, but nevertheless illustrates an example of a struggling life which may provide problems for both terrestrial and aquatic life-forms. Aside from the human dependency, being that “More than 450 million people live within 60 kilometers of coral reefs, with the majority directly or

These increasing ocean temperatures, which result in global warming, are mostly due to the amount of CO2 released in the air, therefore threatening the existence of the coral reef systems (Cole, Pratchett and Jones). The reduction of the coral reef ecosystems are attributed to the climate induced bleaching from the past decade. The loss of coral reef environments has direct affects to the habitat of an organism within the reefs (Cole, Pratchett and Jones), leading to a decrease in biodiversity (Coker, Pratchett and Munday).

The coral reef’s ecosystem are in major threat of the current bleaching events. Coral reefs are the main marine environment, which includes a variety of over 4,000 fish, and 800 different type of hard coral (“Corals”). Over 25 percent of marine animals are supported by the coral environment (“Coral Reefs”). The reefs are a key element of the ocean’s ecosystem (“Coral Reef Destruction”). Water temperatures are estimated to keep rising in the decades to come, which intensifies coral bleaching and other problems like black band disease, and white plague. These illnesses cause a majority of the coral to die, which will then lead to their ecosystem to plummet (“Global Warming”). Research as estimated that one to eight million organisms are yet unknown to scientists

The researchers from the Australian universities has identified genes that allow some algae living in corals to tolerate higher ocean temperatures than others. The problem of coral bleaching is becoming more urgent throughout the world, so Australian scientists decided to study it on a genetical level. The genes could act as markers to understand the risk of coral bleaching in different areas of tropical reefs including the Great Barrier Reef.

Coral reef ecosystems around the globe are threatened by human interferences and climate change. This has led to many scientists conducting studies on global coral reef ecosystems to gain a better understanding of the cause and effects of coral reef damage. In both Hodgson’s (1999) and Carpenter et al.’s (2008) studies, they are aware of the continuous degradation of global coral reef ecosystems. Hodgson's study involved conducting a survey on global coral reef ecosystems to see whether human actions were affecting the health of supposed pristine Coral reefs. Carpenter et al. incorporated Hodgson’s study into a compiled study about the possible extinction of reef building corals due to climate change and anthropogenic effects. Carpenter’s

Biophysical interactions refer to the ways in which the four spheres, atmosphere, lithosphere, hydrosphere and biosphere interact with each other, which in turn leads to their diverse ecosystem functioning and the extent and nature to which they operate. The Great Barrier Reef is a diverse underwater marine ecosystem located off the coast of northern Queensland, it stretches 2300km to Fraser Island, has 3 000 different reefs and it is considered the largest living structure on the planet. The biophysical interactions including the dynamics of weather and climate, geomorphic and hydrological process biogeographical processes and the adjustments in response to natural stress all lead to the diversity and functioning of the Great Barrier Reef

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.