Fluid Dynamics in Seagrass Ecology—from Molecules to Ecosystems

Koch, Evamaría W.; Ackerman, Josef Daniel; Verduin, Jennifer; Keulen, M. van

doi:10.1007/1-4020-2983-7_8

Cited by 111 publications

(133 citation statements)

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“…The large carbon burial capacity documented for seagrass meadows is strengthened by the role of their canopies in enhancing sediment deposition (Gacia et al 2002). Seagrasses alter their surrounding physical habitat, since their canopies attenuate turbulence and reduce water flow (Koch et al 2006), promoting fluxes of particles to the bed (Hendriks et al 2008) enhancing sedimentation (Koch et al 2006;Bos et al 2007) and preventing resuspension (Gacia and Duarte 2001). These intrinsic properties of macrophyte canopies act to stabilize sediments, reduce erosion and turbidity of the overlying water column (Madsen et al 2001), strongly influencing near-shore sediment dynamics (Marba et al 2002;van der Heide et al 2007).…”

Section: Introductionmentioning

confidence: 99%

Effects of seagrasses and algae of the Caulerpa family on hydrodynamics and particle-trapping rates

et al. 2009

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The widespread decline of seagrass beds within the Mediterranean often results in the replacement of seagrasses by opportunistic green algae of the Caulerpa family. Because Caulerpa beds have a different height, stiffness and density compared to seagrasses, these changes in habitat type modify the interaction of the seafloor with hydrodynamics, influencing key processes such as sediment resuspension and particle trapping. Here, we compare the effects on hydrodynamics and particle trapping of Caulerpa taxifolia, C. racemosa, and C. prolifera with the Mediterranean seagrasses Cymodocea nodosa and Posidonia oceanica. All macrophyte canopies reduced near-bed volumetric flow rates compared to bare sediment, vertical profiles of turbulent kinetic energy revealed peak values around the top of the canopies, and maximum values of Reynolds stress increased by a factor of between 1.4 (C. nodosa) and 324

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Section: Introductionmentioning

confidence: 99%

Effects of seagrasses and algae of the Caulerpa family on hydrodynamics and particle-trapping rates

et al. 2009

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“…According to several authors, macroalgal composition in seagrass meadows is also influenced by nutrient input, interactions between grazers, banks of propagules, and other factors (DAHL, 1973;HARLIN, 1975;PEDRINI et al, 1997;VIRNSTEIN;CARBONARA, 1985;ZIEMAN;ZIEMAN, 1989;BOROWITZKA et al, 1990;REIS;YONESHIGUE-VALENTIN, 1998;ASMUS, 2001;BIBER et al, 2004;VAN ELVEN et al, 2004;HAYS, 2005;KOCH et al, 2006). On the rocky habitats studied here, hydrodynamic patterns appeared to be the main environmental influence.…”

Section: Discussionmentioning

confidence: 59%

“…Confirming this hypothesis, Van Elven et al (2004) observed higher biomass and species composition of epiphytic macroalgal assemblages on seagrasses closer to reefs. As Koch et al (2006) added, this biotic factor is also regulated by environmental factors such as the local hydrodynamics.…”

Section: Discussionmentioning

confidence: 99%

Influence of the shoot density of Halodule wrightii Ascherson from rocky and sandy habitats on associated macroalgal communities

et al. 2013

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A B S T R A C TThis study evaluated the influence of the shoot density of the shoal grass Halodule wrightii on the composition of the associated algal community, in rocky and sandy habitats on the coast of Ceará in northeastern Brazil. The phycological community included 18 species in 10 families, members of Rodophyta (72.2%), Chlorophyta (22.2%) and Phaeophyceae (5.5%). The largest proportion were epilithic (50%), followed by epiphytes on H. wrightii (38.4%), epipsammics (8%), and epiphytes on other algae (4%). Epiphytes on H. wrightii occurred mainly associated with rhizomes, but also tendrils of H. musciformis occurred attached to the leaves. The phycological community varied according to the density of H. wrightii, independently of particular characters of the meadows, although both habitat and other environmental variables seemed to influence the macroalgae composition and diversity. The rocky habitat was more diverse than the sandy habitat, but in the sandy habitat the shoal grass was important for algal settlement in areas where hard substrates were scarce or absent. R E S U M OEste estudo avaliou a influência da densidade do capim-agulha Halodule wrightii sobre a composição da comunidade algal associada, em habitats rochosos e arenosos da costa do Ceará, Nordeste do Brasil. A comunidade ficológica incluiu 18 espécies em de 10 famílias, integrantes de Rodophyta (72.2%), Chlorophyta (22.2%) e Phaeophyceae (5.5%). A maior proporção foi epilítica (50%), seguida pelas epífitas de H. wrightii (38.4%), epífitas de outras algas (8%) e epipsâmicas (4%). Epífitas de H. wrightii ocorreram associadas com os rizomas, mas gavinhas de H. musciformis ocorreram presas às folhas. A comunidade ficológica variou de acordo com a densidade de H. wrightii independentemente das características particulares dos prados estudados, embora tanto o habitat quanto outras variáveis ambientais pareceram influenciar a composição e diversidade das macroalgas. O habitat rochoso foi mais diverso que o arenoso, mas no habitat arenoso o capimagulha foi importante para o assentamento de algas em áreas onde substratos duros foram raros ou ausentes.

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“…Seagrass litter, however, is considered an important source of N in these meadows as shown by the large allocation of N to leaf production (Stapel et al 2001), the short leaf age and low resorption of N from senescing leaves (Hemminga et al 1999). This litter material is efficiently retained within the meadows, due to the particle trapping capacity of the seagrasses (Koch et al 2006) and the collection of litter by burrowing fauna species (Vonk et al 2008a), as shown also by the low export of litter from these meadows (Stapel et al 1996). Combined with the low amount of detritus and the high decomposition rates of litter in the meadows, this indicates that N associated with detached leaf material is efficiently regenerated and forms an important source of N for uptake by seagrasses.…”

Section: Uptake Of Released Nmentioning

confidence: 99%

“…The N demand of these seagrass systems therefore seems to be met by an efficient process of trapping of organic material, uptake of dissolved N sources and recycling of seagrass material (Hemminga et al 1991, Erftemeijer & Middelburg 1995. Uptake efficiency of N released from litter by the seagrass leaves may depend on the density (Koch et al 2006) and size of the meadow (Stapel et al 2001). N recycling can be accomplished through rapid in situ decomposition of seagrass litter within the seagrass beds (Fenchel et al 1998) and subsequent uptake of released N by the leaves (Stapel et al 2001), identifying decomposition rates of seagrass litter as important fluxes in the nutrient cycling of seagrass meadows (Mateo & Romero 1996).…”

Section: Introductionmentioning

confidence: 99%

Regeneration of nitrogen (15N) from seagrass litter in tropical Indo-Pacific meadows

Vonk¹,

Stapel²

2008

Mar. Ecol. Prog. Ser.

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Fluid Dynamics in Seagrass Ecology—from Molecules to Ecosystems

Cited by 111 publications

References 0 publications

Effects of seagrasses and algae of the Caulerpa family on hydrodynamics and particle-trapping rates

Effects of seagrasses and algae of the Caulerpa family on hydrodynamics and particle-trapping rates

Influence of the shoot density of Halodule wrightii Ascherson from rocky and sandy habitats on associated macroalgal communities

Regeneration of nitrogen (15N) from seagrass litter in tropical Indo-Pacific meadows

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