Shellfish Mariculture in Drakes Estero, Point Reyes National Seashore, California (2009) / Chapter Skim
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II. Eelgrass
II. Eelgrass
Pages 30-34
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From page 30... ...
in estuaries along the West Coast of the United States with its upper limit determined primarily by desiccation (Boese et al., 2005) and the lower limit determined by light.
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From page 31... ...
Eelgrass information is limited to some observations of eelgrass distribution relative to oyster mariculture racks in research examining potential impacts of the oyster mariculture on eelgrass invertebrate and fish communities (Harbin-Ireland, 2004; Wechsler, 2004) , a visual analysis of the extent of tracks of boat propeller damage by NPS scientists and apparent eelgrass displacement by oyster racks (NPS Trip Report of March 13, 2007)
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(2007) , who examined recovery over a longer period, found enhanced seedling survival following disturbance caused by on-bottom culture and dredge harvest versus long-line oyster culture in Willapa Bay, Washington.
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From page 33... ...
Oyster production levels varied by more than an order of magnitude over the decades, shown in Figure 6, for a variety of reasons, and the past impacts of the oysters, clams, and mariculture activities doubtlessly varied as well. Recovery from scars has been shown to take up to four years in other areas for turtle grass, Thalassia testudinum, but this set of observations was made on a different species, only from small disturbance tracks, and in a very different system; recovery rate on a larger scale is unknown (Dawes et al., 1997)
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From page 34... ...
in the estuary. Changes in spatial scale of eelgrass cover at the estuarine landscape scale rarely have been assessed in areas with aquaculture, but a decline was attributed to storm events and not the presence of aquaculture in Bahia de San Quentin, despite a large increase in the number of oyster racks placed in that estuary between 1987 and 2000 (Ward et al., 2003)
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