Shellfish Mariculture in Drakes Estero, Point Reyes National Seashore, California (2009) / Chapter Skim
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IV. Benthic Invertebrates in Soft Sediments
IV. Benthic Invertebrates in Soft Sediments
Pages 38-40
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From page 38... ...
deposition of oyster feces and pseudofeces, which under conditions of low flushing could induce sediment anoxia intolerable to most infaunal invertebrates; (3) modification of sediment organic content and thereby production of microbial foods for deposit feeders; (4)
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From page 39... ...
Specifically, the flushing by tidal currents in Drakes Estero is sufficient to induce erosion around the stakes holding the oyster racks in eelgrass beds, but the resulting change in size composition of sediments is minor. These tidal currents also are sufficient to disperse the organic rich oyster bio-deposits sufficiently widely to avoid inducing detectable organic enrichment of the sediments nearby and subsequent mass mortality of benthic macro-invertebrates from sediment anoxia.
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From page 40... ...
The absence of eelgrass underneath the racks also implies faster near-bottom flows than underneath the eelgrass canopy, which baffles flow velocity by friction. Slower flows underneath seagrass canopies induce deposition of fine particles and thus create finer sediment sizes (Madsen et al., 2001)
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