Picturing the Reef


The Red Sea is located between
North Africa and Saudi Arabia.
Image taken from: http://www.coral-reef-info.com/red-sea-coral-reefs.html



Eilat is located at the Northern tip of the Red Sea on the Southern tip of Israel.  This reef is one of the northernmost reefs in the world.  
Image taken from: http://www.turquoiseguide.com/articles/turquoise/variations/eiliat-map.jpg


An aerial view of the reef.  The reef extends from 1200 meters along the coast of Eilat.
Image taken from: http://cdn2.vtourist.com/6/6300269-Corall_reef_Eilat_IL_Eilat.jpg



A snapshot of the coral reef that lies beyond the surface of the Red Sea. 
Image taken from: http://divezone.net/c/p/photos/diving/eilat-reef-scuba-diving-review.jpg

Historical State


     Historically, the Red Sea Coral Reefs have been known for their high level of coral species diversity and high levels of endemism- and Eilat is no exception. There are more than 270 coral species that are home to more that 2,500 species of underwater organisms, many of which are endemic.  Over the years, the unpredictable midday low tides characteristic of this region have actually maintained the diversity of the coral reef; these low tides prevent one species from monopolizing the area.  The temporal reproductive isolation of these coral species have also led to high diversity.  The most abundant species breed at different times of the year- the case is the same for more minor species as well.  Another reproductive mechanism that allows for the large amount of diversity is that the majority of species reproduces during the same time that benthic algae disappears each year.  Because space on the reef is an issue, this seasonal disappearance allows for the coral to reproduce and spread out.
      Sadly, many of the reefs, like in Eilat, have a tormented history of destruction and degradation.  50 years ago, the reef was much larger than it is today.  The reefs have been destroyed over the past three decades, and especially over this last decade.  Two events in particular have contributed to the degradation of the reefs in Eilat: an extremely low tide in 1970 and chronic oil spills from 1970-1980.  The low tide caused the water level to drop 20-25 cm below the reef flats, exposing the reef to the air and sund for 3-4 hours during the hottest time of the day.  This ultimately led to the destruction of 80-85% of the corals. During 1970-1980, oil tankers were causing 2-3 large-scale oil spills each month, completely blackening the reef!  Thankfully, since this dark period oil spills have become rare, namely due to the major reduction of oil tankers arriving in Eilat, the establishment of a Pollution Prevention Control Station, and the large fines imposed on shipping companies.

Low tide.
Image taken from: http://www.coralworld.co.il/SiteContent/BankImages/690.jpg


Oil spill. 
Image taken from: http://www.tampabay.com/blogs/alleyes/sites/tampabay.com.blogs.alleyes/files/images/typepad-legacy-files/1149.6a00d83451b05569e20133f12d0fd1970b-900wi.jpg

Human Impacts

     As the population in Eilat has grown over the past 30 years, so too have the human impacts on the reef.  Pollution, floods, diving, shoreline development and urban sewage plague these reefs and threaten impending doom.  Destruction has been high especially in the past ten years.  The biggest destruction the reef faces comes from diving.  Eilat has come to be known as one of the best reefs for diving in the world.  Divers come from all over attracted by the plethora of beautiful and unique fish that swim among the equally diverse corals.  Sadly, all of this beauty brings in a lot of destruction from the divers. With more than 250,000 dives per year in just a 12 km area, destruction is high.  Divers unintentionally damage the corals by breaking their skeletons or damaging their tissues affecting the growth and reproduction of the corals.  Compared to the reefs in Egypt, Eilat had the most damage from diving with up to half of all colonies broken in certain species.
     The Eilat Reef is extremely vulnerable to pollution because the gulf that the reef is situated in has a low rate of water exchange with the Red Sea.  The pollution the reef battles is the culmination of several different pollutants, including the port of Eilat, sewage outflows, and fish culture facilities.  Coral death has been linked to such pollution, especially sewage waste.
     Floods wash silt and sedimentation into the reef.  This creates a layer covering the reef, which damages the corals as well as affects the larval settlement and recruitment (the population of young coral that are entering adulthood).
     Another human impact that the reef faces is overfishing.  Fishing can alter the ecological balance in a reef.  Intensive fish farming in the area has lead to eutrophication, a leading threat to water quality.  There has been observed tissue damage to the corals upon eutrophication.  Eutrophication can also cause algal blooms, and the algae competes with the corals for space on the reef.  Although it has not been definitively proven, it appears that the eutrophication has damaged the coral, because in areas where no diving is allowed there is still damage.

The numerous dive sites along the reef.
Image taken from: http://www.luckydivers.com/eyal/english/english_guided.html?gclid=CIii6-Ho8LMCFUdxQgodnTgAag

Future Prospects

The Eilat Reef is currently in an extremely critical state and its future looks bleak.  If nothing is done to fix the damage and further protect the reef, it will likely die out.  In the past few years coral death rates have been remarkably high and not enough has been done to deter this.  Drastic measures need to be made and quickly if this reef is to thrive once again.

Image taken from: http://0.tqn.com/d/chemistry/1/0/c/h/poison.jpg

Improving Human Impacts

     Although measures have been taken to preserve the reef, much more drastic changes need to be made if we really want to see an improvement.  The Eilat Reef has been declared a national preserve, and because of this only a limited number of divers are allowed in the area at a time.  Furthermore, the Jewish National Fund is planting coral nurseries to stimulate new growth in the reef.
     Looking towards the future, Israel should adopt the Precautionary Principle and assume that anything that can possibly cause harm does until proven otherwise.  Thus,  all further project devlopment should be rejected.  No more hotels or other large buildings should be built near this reef and any new developments should be setback away from the coastline.  The run-off and sewage from any new and existing developments needs to be properly controlled and treated.  One way to mitigate current sewage and run-off issues is to test the water and link any contaminates back to their source so the problem can be dealt with directly.
     Likewise, intensive fish farming should be banned.  Although it has not been definitively proved that this practice harms coral reefs, under the Precautionary Principle it should be stopped until it is definitively proven that it doesn't harm coral reefs.
     The biggest issue affecting the reef is most likely diving, since the Eilat Reef attracts so many divers.  Thus, strict and numerous laws need to be made and enforced to make sure that this enterprise does not kill the reef.  Less divers should be permitted to dive at once, a guide should always accompany divers (whether they are experienced or beginners), dive training should be held in areas outside the reef, and there should be large fines for anybody who touches the coral.  Thorough enforcement of these laws is imperative.
     Oil spills are less common now, because there has been a huge decrease in the amount of oil tankers in the port of Eilat, due to political issues, and the Israeli Ministry established the Pollution Prevention Control Station.  However, ships can still cause damage.  Shipping lanes should be created that direct boats far enough away from the reef so that the boats nor their anchors harm the coral.
     Perhaps the most important weapons against coral reef degradation are education and awareness.  Spreading the word and making people aware of how we are destroying these beautiful ecosystems may lead to a large-scale effort to protect these areas.  Making more people conscious of what to do and not to do to help reefs thrive will little by little help the quality of life for the reef.  Historically. propaganda and getting people to band together is the best way to get anything done.

Data

Figure taken from: http://www.tau.ac.il/lifesci/departments/zoology/members/loya/documents/157.pdf


Percent cover of live stony corals, and percent of colonies damaged (skeletal breakage or tissue abrasion) at four sites in Eilat, Israel, northern Red Sea. Sites are ordered from low to high dive use. 
n=20 1-m2 quadrats were examined per site. 
Figure taken from: http://www.sciencedirect.com/science /article/pii/S0006320701001811


Figure taken from: http://www.tau.ac.il/lifesci/departments/zoology/members/loya/documents/157.pdf


References


  1. http://www.int-res.com/articles/misc/m263p307.pdf
  2. http://www.int-res.com/articles/meps2003/261/m261p305.pdf
  3.  http://www.auburn.edu/cosam/faculty/biology/chadwick/website/Publications_files/Weilgus%20et%20al%202004.pdf
  4.  http://www.tau.ac.il/lifesci/departments/zoology/members/loya/documents/157.pdf
  5.  http://www.goisrael.com/Tourism_Eng/Articles/Attractions/Pages/The%20Coral%20Reef%20in%20Eilat.aspx
  6.  http://www.jnf.org/work-we-do/our-projects/research-development/coral-reef-restoration.html
  7. http://projectbluehope.com/2011/04/02/10-ways-you-can-help-save-coral-reefs/