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Biological and environmental drivers in mangrove propagule dispersal and recruitment: a field and modelling approach

Authors
Publication Date
Keywords
  • Dispersal Phenomena
  • Hydrodynamics
  • Mangroves
  • Roots
  • Winds
Disciplines
  • Ecology
  • Geography
  • Mathematics

Abstract

Microsoft Word - 20120508_MMM3_Title_Page_Abstracts_A4_2May12.docx Biological and environmental drivers in mangrove propagule dispersal and recruitment: a field and modelling approach T. Van der Stocken12*, D. De Ryck1-2*, T. Balke3, T. J. Bouma4, D. Di Nitto12, J.G. Kairo5, F. Dahdouh-Guebas1'2 & N. Koedam1 'Laboratory of Plant Biology and Nature Management, Vrije Universiteit Brussel, Pleinlaan 2, B-1050 Brussels, Belgium. E-mail: [email protected] laboratory of Systems Ecology and Resource Management, Universit√© Libre de Bruxelles, Av. F.D. Roosevelt 50, CPI 169, B-1050 Brussels, Belgium. 3Deltares, PO Box 177, 2600 MH Delft, The Netherlands 4Netherlands Institute for Sea Research (NIOZ; fonner NIOO-KNAW), 4400 AC Yerseke, The Netherlands 5Kenya Marine and Fisheries Research Institute, PO Box 81651, Mombasa, Kenya *Equal contribution Abstract Mangrove propagule dispersal is a key driver of the architecture and functioning of mangrove populations and communities. Nevertheless, there is a lack of information on hydrochorous dispersal of propagules, covering the period between propagule abscission from the tree and propagule stranding. The relative importance of current velocity, waves, wind and the absence/presence of roots/pneumatophores on propagule movement out of the forest and on open water remain understudied. Such knowledge is however crucial, to obtain fundamental insight in relative dispersal behavior between species, and for the construction of mathematical (individual based) dispersal models. In this study, experiments were conducted in a flume tank to establish the effect of water velocity, presence/absence of wind and the density of roots/pneumatophores (0, 5, 10 and 20 m'2) on the dispersal speed of a propagule. Propagules of four mangrove species were used to eludicate the effect of propagule morphology. In a first experiment, dispersal velocities were calculated for two different water flow velocities (15 cm s '1 and 30 cm s'1). In a second experi

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