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Dynamics of mangrove forests in the Mangoky River delta, Madagascar, under the influence of natural and human factors

Rakotomavo, Andriamparany and Fromard, François Dynamics of mangrove forests in the Mangoky River delta, Madagascar, under the influence of natural and human factors. (2010) Forest Ecology and Management, 259 (6). 1161-1169. ISSN 0378-1127

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Official URL: http://dx.doi.org/10.1016/j.foreco.2010.01.002

Abstract

Mangroves in Madagascar cover 327 000 ha to 340 300 ha. Several authors have studied these mangroves, but we do not yet have a complete knowledge of these ecosystems. The present study is an attempt to respond to this concern by analyzing dynamics and changes in the extent of the mangrove forest in the Mangoky delta (SW Madagascar) between 1951 and 2000. The comparison between base maps and Landsat TM images shows that the mangrove area remained relatively stable, even increasing slightly (+189 ha) between 1951 and 1979. From 1979 to 1994, its area decreased from 21 426 ha to 11 706 ha (−9720 ha). It then increased again (+84 ha) between 1994 and 2000. The balance was a decrease of 41.74% between 1951 and 2000. These figures may be compared with national (−15% in 56 years) and world (−35% for the last 20 years) statistics. Three main reasons are given to explain these changes: (1) the hydrological and sedimentological behavior of the Mangoky River; (2) the mechanism of plant succession, which depends on tides and on the characteristics of the substratum and (3) human activities and logging, which have increased since the 1980s in the Mangoky delta.

Item Type:Article
Additional Information:Thanks to Elsevier editor. The definitive version is available at http://www.sciencedirect.com The original PDF of the article can be found at Forest Ecology and Management website : http://www.sciencedirect.com/science/journal/03781127
HAL Id:hal-00997388
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution:French research institutions > Centre National de la Recherche Scientifique - CNRS (FRANCE)
Université de Toulouse > Institut National Polytechnique de Toulouse - INPT (FRANCE)
Université de Toulouse > Université Toulouse III - Paul Sabatier - UPS (FRANCE)
Other partners > Bureau d’études SAVAIVO (MADAGASCAR)
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Deposited By: Cédric ARNAL
Deposited On:27 May 2014 06:41

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