Classification hiérarchique des zones boisées d’altitudes de l’île d’Anjouan, Comores

The second largest island of the Comoros archipelago, Anjouan, was covered by forest before human colonization, whereas today only a few forest fragments remain on steep and inaccessible slopes. Under human pressure, the loss of forests to make place for agricultural areas continues. The present stu...

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Autores principales:	Houmadi Amélaïd, Pascal Fust, Kathleen Green, Mohamed Daniel, Ishaka Said, Joelisoa Ratsirarson, Steeves Buckland
Formato:	article
Lenguaje:	FR
Publicado:	Éditions en environnement VertigO 2020
Materias:	forest use habitat classification agricultural exploitation Comoros Indian Ocean islands Environmental sciences GE1-350
Acceso en línea:	https://doaj.org/article/f30a3fb872374c95bc5accbdc54471ea
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spelling	oai:doaj.org-article:f30a3fb872374c95bc5accbdc54471ea2021-12-02T10:01:42ZClassification hiérarchique des zones boisées d’altitudes de l’île d’Anjouan, Comores1492-844210.4000/vertigo.28263https://doaj.org/article/f30a3fb872374c95bc5accbdc54471ea2020-10-01T00:00:00Zhttp://journals.openedition.org/vertigo/28263https://doaj.org/toc/1492-8442The second largest island of the Comoros archipelago, Anjouan, was covered by forest before human colonization, whereas today only a few forest fragments remain on steep and inaccessible slopes. Under human pressure, the loss of forests to make place for agricultural areas continues. The present study investigated the vegetation of Anjouan to determine which habitat types can be found on the island. In 2010, we collected data on vegetation composition using a plot-based methodology. Two types of analyses were used to partition the habitat into different classes : principal component analysis (PCA) and hierarchical cluster analysis (HCA). Six habitat classes were identified : plantations in high altitude open areas, plantations in less wooded areas, low altitude agroforestry, severely degraded and under-planted forest, degraded forest and dense natural forest. The first four classes were associated with agricultural activities in varying intensities. Significant differences between habitat classes were distinguished by Kruskal-Wallis tests for tree densities (native and non-native), species diversification, and level of agricultural exploitation. The findings show that the vegetation cover in Anjouan is marked by human exploitation, which requires monitoring to avoid over-exploitation of the last remaining natural forests on the island. The results of this study will be used for the agroforestry management planning and the implementation of conservation actions for forest habitats on the island.Houmadi AmélaïdPascal FustKathleen GreenMohamed DanielIshaka SaidJoelisoa RatsirarsonSteeves BucklandÉditions en environnement VertigOarticleforest usehabitat classificationagricultural exploitationComorosIndian Ocean islandsEnvironmental sciencesGE1-350FRVertigO, Vol 20, Iss 2 (2020)
institution	DOAJ
collection	DOAJ
language	FR
topic	forest use habitat classification agricultural exploitation Comoros Indian Ocean islands Environmental sciences GE1-350
spellingShingle	forest use habitat classification agricultural exploitation Comoros Indian Ocean islands Environmental sciences GE1-350 Houmadi Amélaïd Pascal Fust Kathleen Green Mohamed Daniel Ishaka Said Joelisoa Ratsirarson Steeves Buckland Classification hiérarchique des zones boisées d’altitudes de l’île d’Anjouan, Comores
description	The second largest island of the Comoros archipelago, Anjouan, was covered by forest before human colonization, whereas today only a few forest fragments remain on steep and inaccessible slopes. Under human pressure, the loss of forests to make place for agricultural areas continues. The present study investigated the vegetation of Anjouan to determine which habitat types can be found on the island. In 2010, we collected data on vegetation composition using a plot-based methodology. Two types of analyses were used to partition the habitat into different classes : principal component analysis (PCA) and hierarchical cluster analysis (HCA). Six habitat classes were identified : plantations in high altitude open areas, plantations in less wooded areas, low altitude agroforestry, severely degraded and under-planted forest, degraded forest and dense natural forest. The first four classes were associated with agricultural activities in varying intensities. Significant differences between habitat classes were distinguished by Kruskal-Wallis tests for tree densities (native and non-native), species diversification, and level of agricultural exploitation. The findings show that the vegetation cover in Anjouan is marked by human exploitation, which requires monitoring to avoid over-exploitation of the last remaining natural forests on the island. The results of this study will be used for the agroforestry management planning and the implementation of conservation actions for forest habitats on the island.
format	article
author	Houmadi Amélaïd Pascal Fust Kathleen Green Mohamed Daniel Ishaka Said Joelisoa Ratsirarson Steeves Buckland
author_facet	Houmadi Amélaïd Pascal Fust Kathleen Green Mohamed Daniel Ishaka Said Joelisoa Ratsirarson Steeves Buckland
author_sort	Houmadi Amélaïd
title	Classification hiérarchique des zones boisées d’altitudes de l’île d’Anjouan, Comores
title_short	Classification hiérarchique des zones boisées d’altitudes de l’île d’Anjouan, Comores
title_full	Classification hiérarchique des zones boisées d’altitudes de l’île d’Anjouan, Comores
title_fullStr	Classification hiérarchique des zones boisées d’altitudes de l’île d’Anjouan, Comores
title_full_unstemmed	Classification hiérarchique des zones boisées d’altitudes de l’île d’Anjouan, Comores
title_sort	classification hiérarchique des zones boisées d’altitudes de l’île d’anjouan, comores
publisher	Éditions en environnement VertigO
publishDate	2020
url	https://doaj.org/article/f30a3fb872374c95bc5accbdc54471ea
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Classification hiérarchique des zones boisées d’altitudes de l’île d’Anjouan, Comores

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