Properties of Sea Grass and Sand Flat Sediments from the Intertidal Zone of St. Andrew Bay, Florida

Grady, John R.

doi:10.2307/1352158

Cited by 27 publications

(15 citation statements)

References 8 publications

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“…Within the bed, the result is consistent with Lopez and Garcia (1998) Second, sediment trapping in the seagrass bed requires horizontal transport to bring suspended sediment from outside into the bed. The concept of a seagrass bed as a depositional environment has been suggested by several authors (e.g., Grady 1981;Ward et al 1984;Almasi et al 1987), and the proposed mechanism for this accumulation may be summarized as reduced shear stress due to loss of momentum in a seagrass bed leading to reduction in resuspension and thus increased sediment accumulation (Koch et al 2006). The connection between lower momentum and reduced resuspension (lower erosion rate) is supported by our results.…”

Section: Sediment Dynamicssupporting

confidence: 86%

Waves in Seagrass Systems: Review and Technical Recommendations

Koch¹,

Sanford²,

Chen³

et al. 2006

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Seagrasses are rooted flowering marine plants that provide a variety of ecosystem services to the coastal areas they colonize. Attenuation of currents and waves and sediment stabilization are often listed among these services. Although we have a reasonably good understanding of how currents affect seagrasses and vice-versa, less is known about interactions between waves and seagrasses, and standard methods for research on waves in seagrass systems have not yet been established. This report presents background information needed to inform and encourage further studies on waves in seagrass systems from both field and modeling perspectives. It reviews current knowledge of waves in seagrass systems, encompassing field and laboratory data as well as modeling efforts. It then describes various methods for measuring waves in seagrass colonized areas and modeling the dynamics of wave-seagrass interactions. Standardization of experimental designs, instrumentation, analyses, and modeling approaches to allow for ready comparison between studies is encouraged.

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Section: Sediment Dynamicssupporting

confidence: 86%

Waves in Seagrass Systems: Review and Technical Recommendations

Koch¹,

Sanford²,

Chen³

et al. 2006

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“…The proportion of coarse, medium coarse, medium fine and fine sand varies from one sampling spot to the other (De Wit, 1988, Table 8 According to the texture triangle of soil taxonomy (FAO 1977) the samples can therefore be described as sand. Grady (1981) found 82-99% sand in seagrass flat sediments in Florida.…”

Section: Abiotic Variablesmentioning

confidence: 98%

The seagrass and associated macroalgal vegetation of Gazi Bay (Kenya)

Coppejans¹,

Beeckman

Wit

1992

Hydrobiologia

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The seagrass and macroalgal vegetation of Gazi Bay (at approximately 50 km south of Mombasa) have been studied by means of 88 releves along 7 transects. Correlation between the distribution of the seagrasses and some abiotic factors (particle size fractions, chemical composition of the substrate) is not well marked. Nevertheless a general zonation and succession of seagrasses could be established: 1. a transition zone between the mangal and the seagrass beds is covered by Boodleopsis pusilla; 2. the pioneer association Halophila ovalis + Halodule wrightii forms low sandy bumps at the upper limit of the seagrass beds, but also occurs in the whole midlittoral where sandlayers have recently been accumulated (e.g. on coral platforms); 3. the climax vegetation of the intertidal zone seems to be Thalassia hemprichii which sometimes is associated with Cymodocea rotundata and C. serrulata, certainly in deeper pools and close to low water mark; Halimeda opuntia, Gracilaria salicornia and G. corticata are also frequent in this vegetation type; 4. from low water at neap tide downwards patches of monospecific Enhalus acoroides vegetation can also occur; 5. from mean low water down to approximately -1 m mixed meadows of Thalassia, C serrulata, C rotundata and Halodule uninervis are well developed; the seaweeds Halimeda macroloba and Avrainvillea obscura are also typical for this zone; locally patches of Syringodium isoetifolium grow on small bumps and Halophila stipulacea grows as a pioneer on bare sand; 6. from -1 m downwards the whole lagoon is covered by homogeneous, monospecific Thalassodendron ciliatum meadows, locally replaced by E. acoroides

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“…The generally higher values for % fines and % carbon at seagrass treatment sites were most likely due to seagrass leaves baffling currents and reducing flow velocities, thereby creating an environment of enhanced deposition for fine sediment and organic particles (Grady 1981;Fonseca and Fisher 1986). At the same time, the relative lack of sediment reworking by ghost shrimps at seagrass sites meant that organic matter would remain available at the top of the sediment rather than being processed by shrimp (Stamhuis et al 1998;Stapleton et al 2001).…”

Section: Discussionmentioning

confidence: 98%

An examination of the spatial and temporal generality of the influence of ecosystem engineers on the composition of associated assemblages

Berkenbusch

Rowden

2006

Aquat Ecol

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The present study evaluated the generality of ecosystem engineering processes by examining the influence of sympatric burrowing shrimps (Callianassidae) and intertidal seagrasses (Zosteraceae) on benthic assemblage composition in two temperate regions, south-eastern New Zealand and north-western U.S.A. In each region, intertidal macrofauna assemblage composition was determined at sites of different burrowing shrimp/seagrass density and where both species co-occured, in three different size estuaries/tidal inlets, on two occasions. Results from both regions showed that the presence of shrimps and seagrasses consistently influenced the composition of the associated infaunal assemblages at all sites, in both summer and winter. Macrofauna assemblages at shrimp sites were significantly different to those at seagrass-only and mixed sites, whereas the composition of the latter sites was similar. The differences observed between sites were best explained by sediment variables. In New Zealand, % fines and seagrass debris showed the highest correlation to differences in assemblage composition, and in the U.S.A. % fines, % carbon and sediment turnover (by shrimp) appeared to be the most important environmental parameters measured. Four to six taxa exhibited the greatest discriminating significance (including corophiid amphipods, spionid polychaetes and oligochaetes) for dissimilarities in assemblage composition observed at the different sites, with generally lower abundances at shrimp than at seagrass sites. The present study highlights the functional importance of seagrasses and bioturbating shrimps as ecosystem engineers in soft-sediment environments, and reveals the generality of their influence on associated macroinvertebrate assemblages. The findings also allow for further development of a heuristic model for ecosystem engineering by shrimp and seagrass which indicate that numerical models that aim to explore the relationship between ecosystem engineer populations and habitat modification should be expanded to capture the interaction of co-occurring engineers and be both spatially and temporally explicit.

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Properties of Sea Grass and Sand Flat Sediments from the Intertidal Zone of St. Andrew Bay, Florida

Cited by 27 publications

References 8 publications

Waves in Seagrass Systems: Review and Technical Recommendations

Waves in Seagrass Systems: Review and Technical Recommendations

The seagrass and associated macroalgal vegetation of Gazi Bay (Kenya)

An examination of the spatial and temporal generality of the influence of ecosystem engineers on the composition of associated assemblages

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