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Effects of intertidal seagrass habitat fragmentation on turbulent diffusion and retention time of solutes

AuthorsLara, M.; Peralta, G.; Alonso del Rosario, José Juan; Morris, Edward P. ; González-Ortiz, V.; Rueda Márquez, J. J.; Pérez Lloréns, José Lucas
Retention time
Zostera noltii
Turbulent diffusion
Issue DateNov-2012
CitationMarine Pollution Bulletin 64(11): 2471-2479 (2012)
AbstractAn in-depth knowledge of solutes advection and turbulent diffusion is crucial to estimate dispersion area and retention time (t R) of pollutants within seagrass habitats. However, there is little knowledge on the influence of seagrass habitat fragmentation on such mechanisms. A set of dye tracer experiments and acoustic Doppler velocimeter measurements (ADV) were conducted. Solute transport conditions were compared in between fragmented (FM) vs homogeneous (HM) intertidal meadows, and in vertical gradients (canopy vs overlaying flow). Results showed the highest horizontal diffusion coefficient (K y, c.a. 10 -3m 2s -1) on FM and at the canopy-water column interface, whereas t R (2.6-5.6min) was not affected by fragmentation. It suggests that (1) FM are more vulnerable to pollution events in terms of dispersion area and (2) at low tide, advection rather than turbulent diffusion determines t R. Furthermore, Taylor's theorem is revealed as a powerful tool to analyze vertical gradients on K y within seagrass canopies. © 2012 Elsevier Ltd.
Identifiersdoi: 10.1016/j.marpolbul.2012.07.044
issn: 0025-326X
Appears in Collections:(ICMAN) Artículos
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