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- W2030792964 abstract "MEPS Marine Ecology Progress Series Contact the journal Facebook Twitter RSS Mailing List Subscribe to our mailing list via Mailchimp HomeLatest VolumeAbout the JournalEditorsTheme Sections MEPS 211:131-142 (2001) - doi:10.3354/meps211131 Trapping of mangrove propagules due to density-driven secondary circulation in the Normanby River estuary, NE Australia Thomas Stieglitz1,2,*, Peter V. Ridd1 1Marine Geophysical Laboratory, School of Mathematical and Physical Sciences, James Cook University, Townsville, Queensland 4811, Australia 2Institut für Biogeographie, Zentrum für Umweltforschung, Universität des Saarlandes, 66041 Saarbrücken, Germany *E-mail: thomas.stieglitz@jcu.edu.au ABSTRACT: The dispersal of mangrove propagules in the Normanby River estuary is dominated by secondary estuarine circulation. On flood tides, an axial surface convergence forms midstream, generated by a density-driven circulation cell. Floating material including mangrove propagules is trapped in the convergence, and moves upstream. On ebb tides, the circulation cell reverses, and propagules move towards the banks, where water velocities are much smaller than midstream. Over a tidal cycle, a net upstream drift of propagules occurs. This displacement effect occurs throughout the tropical dry season. Buoyant propagules of Rhizophora stylosa, Bruguiera gymnorrhiza, Xylocarpus mekongensis and Heritiera littoralis have been found to be transported upstream at a speed comparable to a net average speed of 3.2 km d-1, found in a drift-drogue experiment. The propagules subsequently accumulate in large numbers in hydrodynamic traps upstream from the convergence and, more importantly, upstream from the mangrove fringe. The hydrodynamic trapping conflicts with the temporal and spatial requirements of propagules to Œfind¹ a habitat suitable for development. KEY WORDS: Mangroves · Propagules · Estuarine circulation · Salinity gradient · Convergence · Dispersal Full text in pdf format PreviousNextExport citation RSS - Facebook - Tweet - linkedIn Cited by Published in MEPS Vol. 211. Online publication date: February 14, 2001 Print ISSN: 0171-8630; Online ISSN: 1616-1599 Copyright © 2001 Inter-Research." @default.
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- W2030792964 title "Trapping of mangrove propagules due to density-driven secondary circulation in the Normanby River estuary, NE Australia" @default.
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