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Fast and easy method for seagrass monitoring: application of acoustic telemetry to precision mapping of Posidonia oceanica beds |
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| Authors: | Descamp Pierre Holon Florian Ballesta Laurent Guilbert Antonin Guillot Marie Boissery Pierre Raimondino Valérie Deter Julie |
| Institution: | a Andromède Océanologie, 21 Chemin des Oliviers, 34400 Saturargues, France b L’OEil d’Andromède, Institut de botanique, 163, rue Auguste Broussonnet, 34090 Montpellier, France c Agence de l’Eau Rhône-Méditerranée-Corse, Délégation de Marseille, Immeuble le Noailles, 62, La Canebière, 13001 Marseille, France d Région Provence-Alpes-Côte d’Azur, Service Mer, 27 place Jules Guesde, 13481 Marseille Cedex 20, France |
| Abstract: | Posidonia oceanica is an endemic seagrass from the Mediterranean Sea. It is an indicator of water quality and of the ecological state of coastal ecosystems. The aim of this paper is to test acoustic telemetry for monitoring the position of P. oceanica meadow limits with varied types. After evaluating the accuracy of the system, we present results from a spatiotemporal survey of P. oceanica meadows on nine sites located on the French coast. The method has been demonstrated to be highly efficient for high precision underwater mapping regardless of meadow type, with 1 cm accuracy for a distance of 40 m between the base and the pointer. A temporal survey led at Cerbere-Banyuls shows a weak global progression of 4 m2 (progression of 26 m2 - regression of 22 m2) between 2006 and 2010. Finally, we discuss the cost and efficiency of this method, and wether it should be generalized for further studies. |
| Keywords: | Interferometry Mapping tool Precision mapping Seagrass bed dynamics Spatiotemporal survey |
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