Fine-scale assessment of changes in zonations of species for the management of imperiled mangroves, Pichavaram, India
| Autor: | Proisy, Christophe, Ghosh, Shuvankar, Muthusankar, G., Helfer, V., J., Carle, C., Hassenrück, R. A., James, Lakshumanan, C., R., Narendran, K., Kathiresan, T., Usha, P., Madeswaran |
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| Přispěvatelé: | Botanique et Modélisation de l'Architecture des Plantes et des Végétations (UMR AMAP), Centre National de la Recherche Scientifique (CNRS)-Université de Montpellier (UM)-Institut National de la Recherche Agronomique (INRA)-Centre de Coopération Internationale en Recherche Agronomique pour le Développement (Cirad)-Institut de Recherche pour le Développement (IRD [France-Sud]), Institut Français de Pondichéry (IFP), Ministère de l'Europe et des Affaires étrangères (MEAE)-Centre National de la Recherche Scientifique (CNRS), Leibniz Centre for Tropical Marine Research (ZMT), Department of Marine Science, Bharathidasan University, Bharathidasan University [Tiruchirappalli, India], Centre of Advanced Study in Marine Biology, Faculty of Marine Sciences, Annamalai University, National Centre for Coastal Research |
| Jazyk: | angličtina |
| Rok vydání: | 2019 |
| Předmět: | |
| Zdroj: | Paper presented at the 5th International Mangrove Macrobenthos and Management (MMM5) Paper presented at the 5th International Mangrove Macrobenthos and Management (MMM5), Jul 2019, Singapore, Singapore |
| Popis: | International audience; Each mangrove region has a specific history which needs to be understood as it is a central component for adapting current conservation plans to changing coastal conditions induced by increasing natural or human pressures. As these latter impact the functioning, physiognomy and extent of mangroves, it is urgent to design and implement monitoring programs able to monitor changes in zonations of mangrove species (ZMS). Recent studies highlighted the combined potential of very high spatial resolution (VHSR) satellite images and robust field data to map such mangrove areas dominated by a few species.Here we examined the Pichavaram mangroves, southeast coast of India. The 1100-ha mangrove wetland area was, in 1987, declared to be a Forest Reserve by the Forest Department, Government of Tamil Nadu. Disturbances generated by the 2004-tsunami, decreasing freshwater, and increasing pollutants inflow, combine to modify the geochemistry of the whole region with a potential influence on the zonation of mangrove species. Afforestation programmes have been carried out since the 1980s using the fishbone canal-bank technique.We inventoried species and measured trunk diameters (DBH), tree heights within forest plots representative of a large range of planted and natural ZMS. Based on this ground expertise, we performed a spectral and textural analysis of five VHSR multispectral images acquired between 2003 and 2018 to generate ZMS maps on a scale of 1:2000. Our results indicate that mangrove cover is increasing while species richness decreases in favour of salt-tolerant species. Our analysis also highlights a shrunk in average tree crown size, suggesting alterations in species succession and plant growth capability. We thank the Tamil Nadu Forest Department for allowing us to undertake this study. |
| Databáze: | OpenAIRE |
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