TEMPO is the network for monitoring the ecological status of Posidonia meadows in two characteristic sectors of this key Mediterranean ecosystem : the lower limit (deepest extension limit) and the intermediate depth (-15 meters ; representative depth of the meadow in the Mediterranean ; Gobert et al., 2009). This network is operated since 2011 by Andromède Océanologie with the support of the Rhone Mediterranean and Corsica Water Agency. It covers the entire French Mediterranean coastline bordered by the three regions : Corsica, SUD region, and Occitania. The objectives are to collect descriptive data on the state and functioning of Posidonia meadows and to monitor their evolution over time and space.
TEMPO currently includes 73 sites located at the lower limit of the meadows (between 5 and 40 m) and 52 sites located at the intermediate depth (around -15 m). Each year, a region is monitored in late spring (May-June) in order to cover the entire coastline every three years. Some TEMPO sites are also monitored for fish (PISCIS network), temperature (CALOR network) and acoustic listening (CALME network).
TEMPO includes 53 sites located at the lower limit of the meadows (between 5 and 40 meters deep) and 47 sites located at the intermediate depth (around -15 m).
Descriptive data on the health and dynamics of P. oceanica meadows are collected on two characteristic areas : at the lower limit (LI) and, since 2014, at the intermediate depth of -15 meters (PI). A descriptive leaflet (Material and methods) of this monitoring network is available on the website.
Acoustic telemetry mapping. The diver uses a pointer equipped with a mini keyboard and a screen to precisely position the limits of the meadow. (Andromède océanologie ©)
According to the PREI protocol, two characteristic sectors of the meadow are monitored (five parameters are measured) : the lower limit (existing TEMPO site) and the intermediate depth. PREI requires sampling of seagrass clusters in situ, which are then analyzed in the laboratory. Very similar to PREI, the BiPo2 index allows the ecological status of each site to be determined by taking into account four parameters based on the health of the P. oceanica plant itself. The EBQI is based on a model of ecosystem functioning that takes into account its different compartments (= “boxes”) : posidonia, algae, herbivores, organic matter, small fauna, small and large predators, seabirds, and the interactions between these compartments. This index requires the in situ sampling of posidonia leaves that are then analyzed in the laboratory.
By clicking on the button “Access the maps” just below, you will find more details on the indicators used at intermediate depth, links to the different scientific publications : PREI indicator (Gobert et al., 2009), BiPo indicator (Lopez Y Royo et al., 2010) and EBQI indicator (Personnic et al., 2014) and two scientific publications by Descamp et al. (2005 and 2010) concerning the acoustic telemetry method.
You will also find the different TEMPO sites located at the lower limit or at the intermediate depth (dark green and light green triangles) and a comparison tool.
Contact : Gwenaëlle Delaruelle (gwenaelle.delaruelle@andromede-ocean.com)
Project leader : Andromède Océanologie – andromede-ocean
Update frequency : Annual monitoring by region (each region, Occitanie/PACA West, PACA East and Corsica, is monitored every three years).
Partners : Rhone Mediterranean and Corsica Water Agency
• Ecological status assessment using P. oceanica (PREI) (Gobert et al., 2009)
• Acoustic telemetry for monitoring P. oceanica (Descamp et al., 2010)
• A biotic index using P. oceanica (BiPo) (Lopez Y Royo et al., 2010)
• An Ecosystem-Based Approach to Assess the Status of a Mediterranean Ecosystem (EBQI) (Personnic et al., 2014)
• Impact of 85 years of coastal development on seagrass beds (Holon et al., 2015)
• Posidonia ecosystem services economical value (Campagne et al., 2015)
• Monitoring Marine Habitats With Photogrammetry (Marre et al., 2019)
• Préservation des posidonies: les ressorts d’une collaboration efficace (Julie Deter et al.,2022)