"Inter-callibration" Principle

mercredi 3 juin 2015
par  Dorian GUILLEMAIN, Romain DAVID
popularité : 18%

NOT YET OPEN TO VALIDATION
Index of "Inter-calibration?"
1. Principle
2. Method
3. Sampling
4. Deliverables
5. To summarize
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How to cite this content :

David R., Arvanitidis C., Çinar M.E., Dubar J., Dubois S., Erga Z., Guillemain D., Sartoretto S., Thierry de Ville d’Avray L., Zuberer F., Chenuil A., Féral J.-P., (2014), with contributors : Açik Çinar S., Andral B., Aurelle D., Aysel V., Bakir K., Bellan G., Bellan-Santini D., Bouchoucha M., Celik C., Chatzigeorgiou G., Chatzinikolaou E., Chenesseau S., Dağli E., Dailianis T., Dimitriadis C., D’Iribarne C., Doğan A., Dounas C., Egea E., Elguerrabi W., Emery E., Evcen A., Faulwetter S., Gatti G., Gerovasileiou V., Güçver S.M., Issaris Y., Katağan T., Keklikoglou K., Kirkim F., Koçak F., Koutsoubas D., Marschal C., Önen M., Önen S., Öztürk B., Panayiotidis P., Pavloudi C., Pergent G., Pergent-Martini C., Poursanidis D., Ravel C., Reizopoulou S., Rocher C., Ruiton S., Sakher S., Salomidi M., Sarropoulou E., Selva M., Sini M., Sourbes L., Simboura N., Taşkin E., Vacelet J., Valavanis V., Vasileiadou A., Verlaque M. Protocols for monitoring of coralligenous habitats of mediterannean (Coralligenous based Indicators to Evaluate and Monitor the "good ecological status" of the MEDiterranean coastal waters) Protocoles de suivi du coralligène en méditerranée (Coralligenous
based Indicators to Evaluate and Monitor the "good ecological status" of the MEDiterranean coastal waters).

[§ 1] Underwater photography is largerly used to study benthic assemblages, and may allow both mapping and and monitoring activities (Zapata-Ramirez et al., 2013). Photography provides permanent records, allow to increase the number of samples, facilitate sampling over large scale, reduce the time spent underwaterand do not require divers with experience in species identification (Preskitt et al., 2004, Lam et al., 2006 ; Leujak and Ormond, 2007 ; Dumas et al., 2009). On the other hand, the small size of the sampling unit (the photo-quadrat ) may negatively affect statistical analyses, leading to uncorrect conclusions (Parravicini et al., 2009), and image analysis is time consuming and it greatly depends on image quality(Magorrian and Service, 1998).

[§ 2] Photographs can be analysed with dedicated image processing softwares, which enable to obtain data about the occurrence, the relative abundance and the cover of the organisms. Such variables are directly conditioned by natural (season, temperature, depth, substrate, etc.) and anthropogenic factors, but when assessed through photographic analyses,they may also be affected by other factors, such as the observer? (scuba diving and underwater photographyexperience, fitness and physical abilities), the sampling equipment (torches and flash, cameras and lens, quadrats type and size), the operators knowledge and practice, and the software and techniques used by operators to analyse the photographs.

[§ 3] Since the first explorations (Rossi, 1961 ; 1965a ; 1965b), photographic sampling has been largely preferred to study coralligenous habitats (e.g. Cecchi and Piazzi, 2010 ; Kipson et al., 2011 ; 2014 ; Teixidó et al., 2011 ; 2013 ; Deter et al., 2012a ; 2012b ; Piazzi et al., 2014 ; Sartoretto et al., 2014 ; Gatti et al., 2015 and references therein). Nevertheless, as a great variety of sampling units and protocols, image analysis tools and techniques are used, a largely accepted approach does not exist so far.

[§ 4] In CIGESMED, several methods of photographic sampling and image processing will be tested, in order to select, depending on the conditions, the most efficient to better understand the natural variability of coralligenous habitats. Eventually, some common variables which could allow comparing coralligenous habitats from the different Mediterranean areas will be selected.

WE EXPECT YOUR SUGGESTIONS OF CORRECTIONS !

- Deadline : 14th December 2015
- Please add comments for each paragraph (§) by means of a corrected new version (one form per §)
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