A Mini-Review of the Contribution of Benthic Microalgae to the Ecology of the Continental Shelf in the South Atlantic Bight
A Mini-Review of the Contribution of Benthic Microalgae to the Ecology of the Continental Shelf in the South Atlantic Bight
复制标题
底栖微藻对南大西洋湾大陆架生态贡献的小回顾
DOI:
10.1007/s12237-018-0401-z
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发表时间:
2018
影响因子:
2.7
通讯作者:
Pinckney, James L.
中科院分区:
文献类型:
--
作者:
Pinckney, James L.
Benthic microalgae (BMA) inhabit the upper few centimeters of shelf sediments. This review summarizes the current information on BMA communities in the South Atlantic Bight (SAB) region of the Southeastern US continental shelf to provide insights into the potential role of these communities in the trophodynamics and biogeochemical cycling in shelf waters. Benthic irradiance is generally 2–6% of surface irradiance in the SAB region, providing sufficient light to support BMA primary production over 80–90% of the shelf width. BMA biomass greatly exceeds that of integrated phytoplankton biomass in the overlying water column on an areal basis. The SAB appears to have lower BMA biomass, but higher production than most temperate continental shelves. Annual production estimates average 101 and 89 g C m−2year−1for 5–20 and > 20 depth intervals, respectively. However, high variation in rates and biomass in time and space make comparisons between studies difficult. Submarine groundwater discharge (SGD) rather than the water column or in situ N regeneration from organic matter maybe the major “new” N source for BMA. The estimated supply of N (1.2 mmol N m−2day−1) by SGD closely approximates the rates needed to support BMA primary production (3.1 to 1.6 mmol N m−2day−1) in the sediments of the SAB. Identifying the source(s) of fixed N supporting the BMA community is essential for understanding the carbon dynamics and net ecosystem metabolism within the large area (76,000 km2) of the continental shelf in the SAB as well other temperate shelves worldwide.
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DOI:
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发表时间:
2006
期刊:
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作者:
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1990
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1993
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影响因子:
3.6
作者:
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DOI:
10.1016/s0302-3524(80)80061-2
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1980
期刊:
Estuarine and Coastal Marine Science
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