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Coral Reef History

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G341 Natural History of Coral Reefs

Scientific Reflection on two topics
Complete this page during the semester to take charge of your own learning
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Topic 1
Write the name of the topic, along with a definition expressed in lay terms, and one expressed in scientific terms.

Invasive Species [lay terms]: Species that are not native to an area and their introduction is likely to cause damage to the existing species/and or the habitat.

Invasive Species [scientific terms]: Species that are alien to an ecosystem or species in which introduction to an ecosystem is likely to harm to native species or harm to the habitat (Invasive Species). Additionally, …show more content…
However, reefs are not locked in their existing stressed states and recovery is possible if the responsible recurrent stressors are alleviated (Precht & Aronson 2006, Idjadi et al. 2010 as cited in Dudgeon et al. 2010, p213). Depending on the reef, a number of different chronic stressors may be acting upon a reef and choosing where to begin can be quite difficulty as the treatment of stressors might be too costly or unrealistic. Dealing with the recurring disturbances may be unrealistic in some cases, but dealing with additional stressors, that could push a reef to shift phases, may be an inexpensive and powerful temporary solution until a more permanent solution can be established. A suggested place to start is management of invasive species that prospered as a result of recurring disturbances. Specifically, eliminating Acanthaster planci from the reefs that have experienced an outbreak of these crown-of-thorns …show more content…
Between 1985 and 2012 the mean hard coral coverage has dropped from 28% to 13.8% and it was estimated that Acanthaster planci were responsible for 42% of the of the loss of coverage (Lucas 2013).These starfish are able to feed on hard corals by excreting digestion enzymes on the coral and then collecting the digested tissue (Lucas 2013); This process of feeding leaves what is known as a “feeding scar” and this exposed and then colonized by algal turf which may reduce larval settlement and recovery of the affected scleratinia (Lucas 2013). This problem has been plaguing reefs for many years and one such reef that has felt the impact of this invasive species is the Great Barrier Reef. Historically dealing with these species has a very difficult and expensive task. Lucas (2013) suggest that dealing with the cause of the outbreaks by stopping the overfishing of crown-of-thorns starfish natural predator or elimination run-off that is causing high nutrient levels. This would likely be an effect way to promote recovery from this stressor. However, as mentioned, even if this may be the best solution, a lot of time, money, and legislation would be required to properly achieve this solution. And with the current state of reefs time seems to be the enemy, so finding an affordable and effective temporary solution,

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