Abstract
Many Amazonian floodplain trees fruit during the high-water period and thus benefit from long-distance dispersal by hydrographic corridors. Two different germination strategies can be observed: Species with buoyant seeds tend to germinate rapidly as soon seeds get in contact with river waters, while species with submerged seeds generally undergo longer dormancies and germinate when flood-waters recede. In Amazonian floodplains, tree seedlings get frequently fully submerged for various periods, inducing hypoxia, complete darkness, and elevated mechanical constraints brought up by water currents and sediment. However, observations from field inventories indicate that seedlings of several várzea tree species perform very well under submergence, whereas mortality rates increase during the terrestrial phases. Establishment strategies seems to change along the flooding gradient: Seedlings from highly flooded low-várzea tree species are well-adapted to tolerate the seasonal inundations, while seedlings from low and irregularly flooded high-várzea tree species are poorly-flood adapted thus reacting very sensitive to flood pulse variations.
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Wittmann, A.d.O., Lopes, A., Conserva, A.D.S., Wittmann, F., Piedade, M.T.F. (2010). Seed Germination and Seedling Establishment of Amazonian Floodplain Trees. In: Junk, W., Piedade, M., Wittmann, F., Schöngart, J., Parolin, P. (eds) Amazonian Floodplain Forests. Ecological Studies, vol 210. Springer, Dordrecht. https://doi.org/10.1007/978-90-481-8725-6_13
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