Soils on exposed Sunda Shelf shaped biogeographic patterns in the equatorial forests of Southeast Asia

Ferry Slik J.W., Aiba Shin-Ichiro, Bastian Meredith, Brearley Francis Q., Cannon Charles H., Eichhorn Karl A.O., Fredriksson Gabriella, Kartawinata Kuswata, Laumonier Yves, Mansor Asyraf, Marjokorpi Antti, Meijaard Erik, Morley Robert J., Nagamasu Hidetoshi, Nilus Reuben, Nurtjahya Eddy, Payne John, Permana Andrea, Poulsen Axel Dalberg, Raes Niels, Riswan Soedarsono, Van Schaik Carel P., Sheil Douglas, Sidiyasa Kade, Suzuki Eizi, Van Valkenburg J.L.C.H., Webb Campbell O., Wich Serge, Yoneda Tsuyoshi, Zakaria Rahmad, Zweifel Nicole. 2011. Soils on exposed Sunda Shelf shaped biogeographic patterns in the equatorial forests of Southeast Asia. Proceedings of the National Academy of Sciences of the United States of America, 108 (30) : 12343-12347.

https://doi.org/10.1073/pnas.1103353108

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Quartile : Outlier, Sujet : MULTIDISCIPLINARY SCIENCES

Liste HCERES des revues (en SHS) : oui

Thème(s) HCERES des revues (en SHS) : Economie-gestion; Psychologie-éthologie-ergonomie

Résumé : The marked biogeographic difference between western (Malay Peninsula and Sumatra) and eastern (Borneo) Sundaland is surprising given the long time that these areas have formed a single landmass. A dispersal barrier in the form of a dry savanna corridor during glacial maxima has been proposed to explain this disparity. However, the short duration of these dry savanna conditions make it an unlikely sole cause for the biogeographic pattern. An additional explanation might be related to the coarse sandy soils of central Sundaland. To test these two nonexclusive hypotheses, we performed a floristic cluster analysis based on 111 tree inventories from Peninsular Malaysia, Sumatra, and Borneo. We then identified the indicator genera for clusters that crossed the central Sundaland biogeographic boundary and those that did not cross and tested whether drought and coarse-soil tolerance of the indicator genera differed between them.We found 11 terminal floristic clusters, 10 occurring in Borneo, 5 in Sumatra, and 3 in Peninsular Malaysia. Indicator taxa of clusters that occurred across Sundaland had significantly higher coarse-soil tolerance than did those from clusters that occurred east or west of central Sundaland. For drought tolerance, no such pattern was detected. These results strongly suggest that exposed sandy sea-bed soils acted as a dispersal barrier in central Sundaland. However, we could not confirm the presence of a savanna corridor. This finding makes it clear that proposed biogeographic explanations for plant and animal distributions within Sundaland, including possible migration routes for early humans, need to be reevaluated.

Mots-clés Agrovoc : changement climatique, migration, genre humain, biogéographie, niveau de la mer, distribution géographique, plante, savane, sol, forêt tropicale humide

Mots-clés géographiques Agrovoc : Bornéo, Sumatra, Malaisie, Asie du Sud-Est

Classification Agris : F70 - Taxonomie végétale et phytogéographie
000 - Autres thèmes
K01 - Foresterie - Considérations générales
F40 - Écologie végétale

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

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