globalchange  > 气候减缓与适应
DOI: 10.1007/s10533-014-0034-7
Scopus记录号: 2-s2.0-84917743342
论文题名:
Eastern oyster (Crassostrea virginica) filtration, biodeposition, and sediment nitrogen cycling at two oyster reefs with contrasting water quality in Great Bay Estuary (New Hampshire, USA)
作者: Hoellein T.J.; Zarnoch C.B.; Grizzle R.E.
刊名: Biogeochemistry
ISSN: 0168-2563
EISSN: 1573-515X
出版年: 2015
卷: 122, 期:1
起始页码: 113
结束页码: 129
语种: 英语
英文关键词: Biodeposits ; Clearance rate ; Denitrification ; Eutrophication ; Phytoplankton
Scopus关键词: denitrification ; filtration ; nitrogen cycle ; oyster culture ; sediment core ; water column ; water quality ; Great Bay [New Jersey] ; New Jersey ; United States ; United States ; Crassostrea virginica ; Ostreidae
英文摘要: Benthic deposition of carbon (C) and nitrogen (N)-rich oyster biodeposits may increase denitrification, or anaerobic respiration of nitrate (NO3−) to di-nitrogen gas (N2). However, environmental drivers of C and N dynamics in oyster biodeposits and reef-adjacent sediments require clarification. In July 2012, we collected intact sediment cores adjacent to and 15–20 m away from two oyster reefs (Crassostrea virginica) in Great Bay, New Hampshire, USA: one reference site and one site with cultural eutrophication. We also measured seston, chlorophyll a, and in situ oyster feeding and biodeposition. Cores were incubated in continuous-flow chambers where inflow water received15N-ammonium (NH4+),15NO3−, or no isotopes (control). We quantified fluxes of dissolved nutrients and gasses (oxygen,28N2,29N2,30N2, and argon) after 24 h. Finally, we measured size-fractionated sediment organic matter. At the eutrophic site, abundant phytoplankton in the 5–28 µm size range was correlated with enhanced oyster feeding rates and biodeposit quality (lower C:N). This site had greater denitrification rates in reef-adjacent cores relative to distal cores. Low production of29,30N2in15NH4+amended cores suggested water column or biodeposit NH4+were unlikely to be converted to N2. At both sites, reef-adjacent cores had more shell and higher29,30N2production with15NO3−addition relative to distal cores, suggesting direct denitrification enhancement near reefs. Oysters likely increased sediment N2production via high quality biodeposits (eutrophic site),and NO3−diffusion via structural complexity of reef-adjacent sediment (both sites). Overall,results suggest oyster-mediated ecosystems services may be expected to vary with environmental conditions. © 2014, Springer International Publishing Switzerland.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/83540
Appears in Collections:气候减缓与适应
气候变化事实与影响

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作者单位: Department of Biology, Loyola University Chicago, 1032 W Sheridan Rd, Chicago, IL, United States; Department of Natural Sciences, Baruch College, City University of New York, Box A-0506, 17 Lexington Ave, New York, NY, United States; Jackson Estuarine Laboratory and Department of Biological Sciences, University of New Hampshire, 85 Adams Point Road, Durham, NH, United States

Recommended Citation:
Hoellein T.J.,Zarnoch C.B.,Grizzle R.E.. Eastern oyster (Crassostrea virginica) filtration, biodeposition, and sediment nitrogen cycling at two oyster reefs with contrasting water quality in Great Bay Estuary (New Hampshire, USA)[J]. Biogeochemistry,2015-01-01,122(1)
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