Browsing by Author "Maanan, Mohamed"
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- Assessing, quantifying and valuing the ecosystem services of coastal lagoonsPublication . Newton, Alice; Brito, Ana C.; Icely, John; Derolez, Valerie; Clara, Ines; Angus, Stewart; Schernewski, Gerald; Inacio, Miguel; Lillebo, Ana I.; Sousa, Ana I.; Bejaoui, Bechir; Solidoro, Cosimo; Tosic, Marko; Canedo-Arguelles, Miguel; Yamamuro, Masumi; Reizopoulou, Sofia; Tseng, Hsiao-Chun; Canu, Donata; Roselli, Leonilde; Maanan, Mohamed; Cristina, Sónia; Carolina Ruiz-Fernandez, Ana; de Lima, Ricardo F.; Kjerfve, Bjorn; Rubio-Cisneros, Nadia; Perez-Ruzafa, Angel; Marcos, Concepcion; Pastres, Roberto; Pranovi, Fabio; Snoussi, Maria; Turpie, Jane; Tuchkovenko, Yurii; Dyack, Brenda; Brookes, Justin; Povilanskas, Ramunas; Khokhlov, ValeriyThe natural conservation of coastal lagoons is important not only for their ecological importance, but also because of the valuable ecosystem services they provide for human welfare and wellbeing. Coastal lagoons are shallow semi-enclosed systems that support important habitats such as wetlands, mangroves, salt-marshes and seagrass meadows, as well as a rich biodiversity. Coastal lagoons are also complex social-ecological systems with ecosystem services that provide livelihoods, wellbeing and welfare to humans. This study assessed, quantified and valued the ecosystem services of 32 coastal lagoons. The main findings of the study are: (i) the definitions of ecosystem services are still not generally accepted; (ii) the quantification of ecosystem services is made in many different ways, using different units; (iii) the evaluation in monetary terms of some ecosystem service is problematic, often relying on non-monetary evaluation methods; (iv) when ecosystem services are valued in monetary terms, this may represent very different human benefits; and, (v) different aspects of climate change, including increasing temperature, sea-level rise and changes in rainfall patterns threaten the valuable ecosystem services of coastal lagoons.
- A multi-sensor approach to monitor the ongoing restoration of edaphic conditions for salt marsh species facing sea level rise: An adaptive management case study in Camargue, FrancePublication . Davranche, Aurélie; Arzel, Céline; Pouzet, Pierre; Carrasco, Rita; Lefebvre, Gaëtan; Lague, Dimitri; Thibault, Marc; Newton, Alice; Fleurant, Cyril; Maanan, Mohamed; Poulin, BrigitteThe Camargue or Rhone delta is a coastal wetland in southern France of which parts formerly devoted to salt production are undergoing a renaturation process. This study assessed a multisensor approach to investigate the link between sediment size distribution, habitat development mapped with Worldview 2, flooding durations estimated with time series of SENTINEL 2 images and elevation modelled with a LIDAR point cloud in former saltworks. A Random Forest classification algorithm was used to map the vegetation distributions of Sarcocornia fruticosa and Arthrocnemum macrostachyum, main representatives of the NATURA 2000 "Mediterranean and thermo-Atlantic halophilous scrubs (Sarcocornetea fruticosi)" habitat on the site. The best habitat map was ob-tained when considering the species separately. The random forest Out-of-bag errors were 1.43 % for S. fruticosa and 2.18 % for A. macrostachyum. Both species were generally distributed on different elevation and flooding duration zones considering mean values. Flooding duration was estimated with the Water In Wetland index (WIW) based on 15 Sentinel-2 scenes. Two models related to sediment grain size distribution were developed: one predicting the flooding duration and one predicting the halophilous scrub distribution. Maps of flooding duration, sediment grain size distribution and elevation highlighted two main zones in the study area: a western section with coarser sediments, shorter flooding durations and higher elevations under sea influence; an eastern section with finer sediments, longer hydroperiods and lower elevations under a historic river influence. This multidisciplinary approach offers perspectives for using space-based data over large scales to monitor changes in edaphic conditions of coastal areas facing natural and anthropogenic forcings. The results call for further in-vestigations to predict the dynamic distribution of other coastal habitats following climate change impacts, such as sea level rise.