Assessing mangrove species diversity, zonation and functional indicators in response to natural, regenerated, and rehabilitated succession

Pimple Uday, Leadprathom Kumron, Simonetti Dario, Sitthi Asamaporn, Peters Ronny, Pungkul Sukan, Pravinvongvuthi Tamanai, Dessard Hélène, Berger Uta, Siri-on Kraiwut, Kemacheevakul Patiya, Gond Valéry. 2022. Assessing mangrove species diversity, zonation and functional indicators in response to natural, regenerated, and rehabilitated succession. Journal of Environmental Management, 318:0301-4797, 17 p.

https://doi.org/10.1016/j.jenvman.2022.115507

Article de revue ; Article de recherche ; Article de revue à facteur d'impact

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Liste HCERES des revues (en SHS) : oui

Thème(s) HCERES des revues (en SHS) : Economie-gestion

Résumé : The United Nations Decade on Ecosystem restoration (2021¬–2030) lists mangrove ecosystems as a restoration priority. Interest in their conservation has increased recently due to their widespread degradation. Anthropogenic stressors and rehabilitation practices, specifically, have resulted in a significant decline in their species compositions. We investigated the knowledge gaps in terms of potential spatial diversity, intertidal zonation, and the historic state of mangrove forest species, and tested the role of environmental factors such as topography, as well as rehabilitation practices on diversity. Diversity and complexity indices, surface elevation, and species and structural diversities along three simplified transect lines over a broad geographical area and under various management practices were analyzed in Trat province, Thailand. Quantitative statistical zonation analyses within each transect and at the landscape-scale were performed using randomization tests and hierarchical cluster analysis. A modified “automatic regrowth monitoring algorithm (ARMA),” based on Landsat (1987–2020) and Sentinel-2 MSI (2015–2020) annual median composites was also used. Fifteen species were identified, with Ceriops tagal as the dominant species. Statistical analysis, however, failed to identify any significant zonation patterns at transect or landscape-scales at specific elevations. Rehabilitated and naturally regenerated stands showed gradual increases in their Normalized Difference Infrared Index over time. After 30 years, the rehabilitated stands made up of Rhizophoraceae monocultures were the same height as the adjacent natural stands. Depending on the location and propagule availability, the diversity and structure of regenerated stands exhibited high variation. Effluent from shrimp farms may have contributed to the disturbance of the forest stands and changes in shrimp farming practices could have facilitated their recovery. The results of the present study provide a valuable diversity baseline for the study site and secondary succession in rehabilitated and regenerated mangroves. The ARMA algorithm has also been confirmed as a valuable tool for future investigations of secondary succession and mangrove biodiversity status.

Mots-clés Agrovoc : biodiversité, mangrove, conservation de la diversité biologique, écosystème, succession naturelle, structure du peuplement, succession végétale, écologie des populations, succession secondaire, succession écologique

Mots-clés géographiques Agrovoc : Thaïlande

Mots-clés libres : Landsat composite, Mangrove, Plantation, Thailand, Conservation

Classification Agris : P01 - Conservation de la nature et ressources foncières
F40 - Écologie végétale

Champ stratégique Cirad : CTS 1 (2019-) - Biodiversité

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