Structure and genetic diversity of Ixora margaretae an endangered species

Verhaegen Daniel, Assoumane Aichatou, Serret Julien, Noe S., Favreau Bénédicte, Vaillant Alexandre, Gâteblé Gildas, Pain Anthony, Papineau Christian, Maggia Laurent, Tassin Jacques, Bouvet Jean-Marc. 2013. Structure and genetic diversity of Ixora margaretae an endangered species. Tree Genetics and Genomes, 9 (2) : 511-524.

https://doi.org/10.1007/s11295-012-0575-7

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Url - jeu de données - Entrepôt autre : https://doi.org/10.5061/dryad.76nv3

Quartile : Q1, Sujet : FORESTRY / Quartile : Q1, Sujet : HORTICULTURE / Quartile : Q3, Sujet : GENETICS & HEREDITY

Résumé : The dry forests of New Caledonia are an exceptional ecosystem because of their numerous endemic botanical species and their highly diversified fauna of insects, mollusks, reptiles and birds. Unfortunately, the area of the dry forests has been significantly reduced, mainly by human activities. Ecological, phenological and genetic analysis of Ixora margaretae, a symbolic species of the sclerophyll forest, has revealed contrasting traits among natural stands. The division of the natural range and then the separation of forest islands has greatly reduced the existing genetic variability of this species. The genetic diversity is strongly structured in genetic clusters which correspond well to specific ecotypes according to the environmental conditions and the forest types. Furthermore, genetic analysis of the reproductive and non-reproductive trees as well the halfsib families obtained by complete protection of mother trees has revealed substantial genetic drift which has resulted in increased loss of allelic variability. The total consumption of seeds by mainly rats confirms the observed absence of natural regeneration. All these results show that measures taken to protect the stands of dry forests will not be enough to maintain sufficient genetic variability of I. margaretae populations in the long term. Assisted regeneration with control of the increase in variability will be necessary to maintain the biodiversity of the species. The results obtained for I. margaretae must be confirmed with other symbolic species in order to take the necessary measures for the effective preservation of the dry forests in New Caledonia.

Mots-clés Agrovoc : forêt tropicale, Rubiaceae, variation génétique, génétique des populations, conservation des ressources, flux de gènes, écologie

Mots-clés géographiques Agrovoc : Nouvelle-Calédonie, France

Mots-clés complémentaires : Ixora margaretae, Forêt tropicale sèche

Classification Agris : F30 - Génétique et amélioration des plantes
F70 - Taxonomie végétale et phytogéographie
F40 - Écologie végétale
K01 - Foresterie - Considérations générales

Champ stratégique Cirad : Axe 6 (2005-2013) - Agriculture, environnement, nature et sociétés

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