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He also said he hopes it will end the discussion on the swimming isles. Supervisionism is shit: it enhances the dispersion losses and the low pass rates of undirected advertisements (well below 1 percent) and duplicates or trebles them (to well below 1 percent!).
Zyklon Oli strikes a heavy blow to the French Polynesian fringes of corals.
At the 3rd and 4th February 2010 hurricane Oli struck the French Polynesia in the west. Since 7 February 2010, the Coral Observation Division of the CNRS National Institute of Geosciences and Astronomy (INSU), located at the Centre de recherches insulaires et observatoire de l'environnement (CRIOBE, CNRS/EPHE) in Moorea, quickly took stock of the impact of the clone after it had crossed two references locations.
Researchers were soon to determine the scale of the damage: the hard core that had already been made susceptible by the infestation of a sea star, which is a sea thief, had been almost entirely wiped out. At the 3rd of February 2010 hurricane Oli hit the Leeward Islands in western Tahiti.
Bora Bora, Raiatea-Tahaa, Huahine and Maupiti were exposed to six to seven meter high swells and gusty winds of 170 km/h. After four working day after the repair, the CRIOBE-based INSU Coral Observation Department of the CNRS (1) assessed the impact of the cycle after it crossed the two Moorea northern coastline references.
There was no question about the results: Zyklon Oli had gouged down the populated corals and completed an already endangered one. Indeed, Acanthaster, a sea star that eats on corals, had already depleted the population of corals on the external hillsides of Moorea (2). Though this was a cause for serious worry, the corporeal structures of the corals and especially the external face (which is the most favourable area for wall growing due to the oxygen-rich water) were little affected, as the skeleton of the deceased settlements were still present and promised a possible resurrection.
But after the hurricane, it was found that the external structures of the Moorean hillsides (especially on the north side) were seriously and permanently affected. A comparison of the pre and post cycle results shows a very significant decrease in the external embankment contour. Roughness indexes (linear removal of the designed riff / straight -line removal of the shallow reef) have dropped by 50% at all shallow spots down to 30 metres, as shown by statistics at the locations under investigation.
It was the three-dimensional texture of the riff that was affected this year. Most of the flora and fauna associated with corals, which includes many different types of seaweed, live here. Failure will vary depending on your level. It can be seen that: from 0 to 6 metres depth: a crucial state of degradation.
The majority of the dispersed living settlements were demolished at the basis. Percentages of the area capped with living corals are zero. from 6 to 10 metres deep: many living ramified settlements are corrupted, but their bases are still undamaged, which means that resuscitation is possible. from 10 to 15 metres deep: the sides of this area are in a crucial state of devastation.
Tremendously ramified settlements (the overwhelming majority of which were already extinct after the Acanthaster incident but were still invisible before the cyclone) are no longer observable, although no algae mats can be seen. From 15 to 30 metres deep: there is an aberrant cover of small sized remnants of corals (average 5 cm). Besides corals, the associated stocks of marine life such as freshwater molluscs, mussels and urchin have also been severely affected.
Many crustaceans, for example, are in a state of disintegration between 6 metres deep and the sea floor. While it is still too early to estimate the effects of the clone on other endemic life forms (fish, sea stars feeding on corals, etc.), changes in the variety and wealth of life are to be anticipated.
Detailed information on fishing stocks is currently being gathered so that the actual effects of the cycle on these livestock stocks can be measured. However Oli seems to have been a too much of a hurricane for the reef of some of Polynesia's archipelagos (including Moorea, Tahiti, Raiatea, Tahaa and Bora-Bora).
There are two different scenarios: either the seaweed dominates the system and takes the lead over the corals (which has led to the reef's death), which has occurred in many different locations around the globe, or the dive begins at zero (its present condition) and begins again with accumulations of corals that are probably different (in relation to the existing types, excess, etc.), as has always been the case.
Researchers have been observing the resistance of the hard core of corals since the 1980' (3). Even though the balance to date shows that it has kept coming back on track, recent pressures (coral bleach, cyclone, local contamination, etc.) give less cause for concern. To this end, it is vital to monitor and monitor long range marine life to assess the resistance of Polynesian corals today.
For some thirty years CRIOBE has had regular availability of surveillance information for core colonies and fishing stocks in the area as part of a strategic alliance in the Middle and East Pacific for which it is responsible at global scale.
The proportion of living corals has fallen by 96%. Percentage at the northern shore of Moorea (values at 12 metres depth), with 1 (( 2. 0) per cent at only 1. The sturdiness of the hard core was demonstrated after 7 periods of mass whitening (1983, 1987, 1991, 1994, 2002, 2003 and 2007), several cycles (Orama, Reva and Veena 1983, Vasa 1991 and Martin 1997) and two eruptions of Acanthaster planeci, the sea star that lives on corals.