Corsica mission: summary of the mission

Wednesday 5 November 2014
by  Dorian GUILLEMAIN
popularity : 10%

Table of contents:



1. Context of the project
2. Objective
3. Partners and participants
4. Summary of the mission
5. Timing of the mission
6. Methodology
7. Sites description (one plan for each site)
8. List of participants
9. Sampling results for each site
10. Bibliography

In four days, 9 dives were done on 8 different sites. 6 of these dives were between 30 and 40 meters deep, 1 between 20 and 30 meters et 2 less than 10 meters deep. These dives permit to collect respectively 207 samples of M. truncata, 89 samples of L. cabiochiae/stictaeforme and 31 samples of C. inornata.
M. truncata is easy to collect on the most of the Corsica’s site? visited, it is abundant until near of the surface, in the weaknesses and the crevices. Colonies close to the surface seem denser and more thickset, and less covered with epiphytic than those in 30 meters deep. From 35 in 40 meters, the density in colony strongly decreases.
L. cabiochiae/stictaeforme is difficult to take from most of the visited stations of Corsica, and according to local people, this specie appears more towards 45 to 50 meters (near Bastia). The actual coralligenous reefs are often situated between 50 and 80 meters. To mitigate this inconvenience, we concentrated our researches on falling facing north (less light) and the most vertical possible (what was not so common in both prospected zones).

We found at the foot of certain falling (between 30 and 35 meters) ripraps (rocks piled by several meters in diameter) creating cavities where L. cabiochiae / stictaeforme seemed to find ideal conditions of luminosity to develop and was in good concentration (several "plates" of L. cabiochiae / stictaeforme by crevice). The youngest taken individuals could have been confused with Mesophyllum. Nevertheless, on the visited sites, we did not notice a bio-concretionnement due to Mesophyllum.
C. inornata was mainly taken under celling (where we also observed in abundance Leptosamia pruvotti and Parazoanthus axinella) in zones between 20 and 40 meters. Certain taken individuals were perhaps confused with Hoplangia durotrix.

3. Partners and participants ← o → 5. Timing of the mission

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