Evaluating the impact of oyster (Crassostrea virginica) gardening on sediment nitrogen cycling in a subtropical estuary

被引:17
|
作者
Mortazavi, Behzad [1 ,3 ]
Ortmann, Alice C. [2 ,3 ]
Wang, Lei [2 ,3 ]
Bernard, Rebecca J. [1 ,3 ]
Staudhammer, Christina L. [1 ]
Dalrymple, J. Donald [2 ,3 ]
Carmichael, Ruth H. [2 ,3 ]
Kleinhuizen, Alice A. [1 ,3 ]
机构
[1] Univ Alabama, Dept Biol Sci, Tuscaloosa, AL 35487 USA
[2] Univ S Alabama, Dept Marine Sci, Mobile, AL 36688 USA
[3] Dauphin Isl Sea Lab, Dauphin Isl, AL 36528 USA
关键词
CHESAPEAKE BAY; MARINE EUTROPHICATION; EASTERN OYSTERS; WATER-QUALITY; MOBILE BAY; NUTRIENT; DENITRIFICATION; DYNAMICS; BIODEPOSITION; RESTORATION;
D O I
10.5343/bms.2014.1060
中图分类号
Q17 [水生生物学];
学科分类号
071004 ;
摘要
To quantify the effect of oysters on sediment N cycling, oyster-free cages and cages with adult or juvenile oysters [Crassostrea virginica (Gmelin, 1791)] were suspended above the sediments at two sites in Mobile Bay, Alabama, located in the northern Gulf of Mexico. While hydrogen sulfide (HS-) was below detection limits at Site 2, HS- exceeded 500 mu M prior to the deployment at Site 1 and remained detectable in sediments in the oyster treatments. Oyster mediated N inputs were estimated at 11.4 (SE 0.4) g N m(-2) and 3.2 (SE 0.2) g N m(-2) in the juvenile and adult treatments, respectively. The abundances of genes associated with denitrifiers (nirK), sulfate reducers (dsrB), and bacterial and archaeal nitrifiers (bac_amoA, arc_amoA, respectively) varied over the course of the study, but were not affected by the treatments. Similarly, potential denitrification rates measured during the study were similar in all treatments. Net N-2 fluxes, determined from N-2:Ar ratios using a membrane inlet mass spectrometer were similar among treatments, despite significantly higher sediment chlorophyll-a content in the juvenile treatment. We conclude that the commonly assumed enhanced rates of N-2 loss from sediments in response to deployment of oysters is not guaranteed and may depend on site-specific biogeochemistry.
引用
收藏
页码:323 / 341
页数:19
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