REPIC

REPIC : AN EXPERIMENTAL PROGRAM FOR THE RESTORATION OF POSIDONIA MEADOWS !

The REPIC programme (« REstaurer la Posidonie Impactée par les anCres », Restore posidonia impacted by anchors) was initiated in 2019 by Andromède Océanologie in partnership with the Rhône Méditerranée Corse Water Agency and NAOS. It allows the replanting of posidonia meadow fragments on workshop sites particularly impacted by anchoring and, thus, to initiate a restoration dynamic (reinforcement of populations) of these meadows. REPIC uses a sampling technique that has no impact on the seagrass beds: the planting of floating bundles torn off by anchors during the summer season (or broken off naturally). These fragments have the following advantages: high availability, moderate collection effort, no impact on existing populations. These fragments are transplanted into areas of dead matte using biodegradable staples specially designed for the project.

 

Transplanting is done by hand on predefined areas after the fragments have been surrounded by a biodegradable staple.

 

Since the programme was set up three years ago, two workshop sites (Golfe Juan and Rade de Beaulieu sur Mer) with different transplanting zones (between 1.5 and 30 metres deep) have been defined. Due to the past degradation of the Posidonia meadow and the new protection measures put in place (notably anchoring regulations), these geographical sites of the REPIC programme are now suitable workshop sites for testing new methods for restoring these meadows. Between 2019 and 2021, professional divers and marine biologists have transplanted, at high density, a continuous surface of about 340m² from 14646 fragments bearing 66045 bundles.

Each year, scientific monitoring is carried out on the transplanted areas: individual monitoring of fragments in permanent quadrats, visual monitoring of all the transplanted areas by photogrammetry, monitoring of the carbohydrate reserves of the fragments and monitoring of the evolution of the temperature of the area. The geographical site effect is also tested by analysing different environmental conditions at each site (salinity, currentology, surface temperature and surface chlorophyll a concentration).

 

The areas are gridded and made up of circles of different densities. @Andromède Océanologie

 

In 2022, with the support of new partners, the Fondation de la Mer and the Artelia Foundation, two missions were carried out for this REPIC programme:

  • A first mission took place in July (12 days) on board Andromeda’s catamaran, the Zembra, in order to carry out scientific monitoring and then to continue transplanting fragments to new areas within the Beaulieu sur Mer workshop site. In total, 1,300 fragments carrying 10,000 shoots were transplanted.
  • A second mission on board the Andromeda trimaran, the Victoria, brought together six professional divers and biologists during August-September (16 days). In total, 2570 fragments carrying 17,000 shoots were transplanted to the workshop site in Beaulieu sur Mer.

The 28 days of fieldwork dedicated to the REPIC programme during the summer of 2022 made it possible to carry out scientific monitoring of the areas transplanted in previous years at the two existing workshop sites and to continue transplanting in new areas within the Beaulieu sur Mer workshop site. Andromeda divers and biologists planted nearly 4,000 fragments carrying 27,000 shoots over an area of approximately 350m² at an average depth of 18 metres.

The results are available and updated annually on the online mapping platform for monitoring Mediterranean coastal waters and ecosystems MEDTRIX (http://plateforme.medtrix) in the RESTAU-MED project which presents ecological restoration projects. For more information on this network you can visit the RESTAU-MED project page.

 

illustration-repic3

Panorama of one of the transplantation areas in Beaulieu-sur-Mer. @Andromède Océanologie.

Contact : Gwenaëlle Delaruelle, gwenaelle.delaruelle@andromede-ocean.com

Porteurs du projet : Andromède Océanologie – www.andromede-ocean.com et and the Eye of Andromède

Fréquence d’actualisation : Annual for the project.

Partenaires : NAOS, Agence de l’eau Rhône Méditerranée et Corse, Fondation de la Mer, Fondation Artelia.

nouveau-logo-AERMC-partenaires
logo-NAOS-partenaires