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Ibanez T., Blanchard E., Hequet Vanessa, Keppel G., Laidlaw M., Pouteau Robin, Vandrot H., Birnbaum P. (2018). High endemism and stem density distinguish New Caledonian from other high-diversity rainforests in the Southwest Pacific. Annals of Botany, 121 (1), 25-35. ISSN 0305-7364

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Lien direct chez l'éditeur doi:10.1093/aob/mcx107

Titre
High endemism and stem density distinguish New Caledonian from other high-diversity rainforests in the Southwest Pacific
Année de publication2018
Type de documentArticle référencé dans le Web of Science WOS:000423708500008
AuteursIbanez T., Blanchard E., Hequet Vanessa, Keppel G., Laidlaw M., Pouteau Robin, Vandrot H., Birnbaum P.
SourceAnnals of Botany, 2018, 121 (1), p. 25-35. ISSN 0305-7364
RésuméBackground and Aims The biodiversity hotspot of New Caledonia is globally renowned for the diversity and endemism of its flora. New Caledonia's tropical rainforests have been reported to have higher stem densities, higher concentrations of relictual lineages and higher endemism than other rainforests. This study investigates whether these aspects differ in New Caledonian rainforests compared to other high-diversity rainforests in the Southwest Pacific. Methods Plants (with a diameter at breast height >= 10 cm) were surveyed in nine 1-ha rainforest plots across the main island of New Caledonia and compared with 14 1-ha plots in high-diversity rainforests of the Southwest Pacific (in Australia, Fiji, Papua New Guinea and the Solomon Islands). This facilitated a comparison of stem densities, taxonomic composition and diversity, and species turnover among plots and countries. Key Results The study inventoried 11 280 stems belonging to 335 species (93 species ha(-1) on average) in New Caledonia. In comparison with other rainforests in the Southwest Pacific, New Caledonian rainforests exhibited higher stem density (1253 stems ha(-1) on average) including abundant palms and tree ferns, with the high abundance of the latter being unparalleled outside New Caledonia. In all plots, the density of relictual species was >= 10 % for both stems and species, with no discernible differences among countries. Species endemism, reaching 89 % on average, was significantly higher in New Caledonia. Overall, species turnover increased with geographical distance, but not among New Caledonian plots. Conclusions High stem density, high endemism and a high abundance of tree ferns with stem diameters >= 10 cm are therefore unique characteristics of New Caledonian rainforests. High endemism and high spatial species turnover imply that the current system consisting of a few protected areas is inadequate, and that the spatial distribution of plant species needs to be considered to adequately protect the exceptional flora of New Caledonian rainforests.
Plan de classementSciences du monde végétal [076] ; Etudes, transformation, conservation du milieu naturel [082]
Descr. géo.NOUVELLE CALEDONIE ; PACIFIQUE SUD OUEST
LocalisationFonds IRD [F B010072052]
Identifiant IRDfdi:010072052
Lien permanenthttp://www.documentation.ird.fr/hor/fdi:010072052

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