Abstract
The standing stock of benthic macroalgae, sediment-associated microalgae and eelgrass (Zostera marina L.) was sampled in conjunction with irradiance and water properties from June 1982 through March 1984 to examine the relationship between the dynamics of benthic primary producers and environmental factors in central Puget Sound, Washington, USA. Sediment-associated microalgal standing stock (measured by chlorophylla) peaked in April and August. The seaweed assemblage, dominated by bladed green algae (e.g.Ulva fenestrata) and eelgrass exhibited maximum standing stocks in August. Although water temperature correlated best with changes in standing stock of all vegetation types, solar irradiance appeared to trigger the onset of biomass buildup and autumn die-back by the plants. Seasonal variations in dissolved oxygen reflected the buildup and loss of plant standing-stock. Nutrient concentrations, with the exception of ammonia, exhibited seasonal trends. Most nutrients were in greatest concentration in winter and reached minimum concentration in late spring-summer. Regeneration of nutrients in autumn followed shortly after the autumn dieback of the benthic vegetation. We concluded that irradiance was the primary controlling factor in the system. Nutrient limitation (primarily nitrate) may control standing-stock accumulations from the period May–October when light is not limiting. In contrast to phytoplankton systems in deep portions of Puget Sound, shallow nearshore systems may be more susceptible to the effects of increased inorganic nutrient-loadings from anthropogenic sources.
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Communicated by M. G. Hadfield, Honolulu
Contribution No. 808, School of Fisheries, University of Washington
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Thom, R.M., Albright, R.G. Dynamics of benthic vegetation standing-stock, irradiance, and water properties in central Puget Sound. Mar. Biol. 104, 129–141 (1990). https://doi.org/10.1007/BF01313166
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DOI: https://doi.org/10.1007/BF01313166