Rare but large bivalves alter benthic respiration and nutrient recycling in riverine sediments

被引:24
作者
Benelli, Sara [1 ]
Bartoli, Marco [2 ,3 ]
Racchetti, Erica [2 ]
Moraes, Paula Carpintero [2 ]
Zilius, Mindaugas [3 ]
Lubiene, Irma [3 ]
Fano, Elisa Anna [1 ]
机构
[1] Univ Ferrara, Dept Life Sci & Biotechnol, Via Luigi Borsari 46, I-44121 Ferrara, Italy
[2] Univ Parma, Dept Life Sci, Viale Usberti 33-A, I-43124 Parma, Italy
[3] Univ Klaipeda, Marine Sci & Technol Ctr, H Manto 84 St, LT-92294 Klaipeda, Lithuania
关键词
Sediment; Sinanodonta woodiana; Metabolism; Excretion; Fluxes; FRESH-WATER MUSSELS; ELLIPTIO-COMPLANATA MOLLUSCA; UNIONID MUSSELS; ECOSYSTEM PROCESSES; NITRATE REDUCTION; NITROGEN; LAKE; DENITRIFICATION; METABOLISM; OXYGEN;
D O I
10.1007/s10452-016-9590-3
中图分类号
Q14 [生态学(生物生态学)];
学科分类号
071012 ; 0713 ;
摘要
Bioturbation studies have generally analyzed small and abundant organisms while the contribution to the benthic metabolism by rare, large macrofauna has received little attention. We hypothesize that large, sporadic bivalves may represent a hot spot for benthic processes due to a combination of direct and indirect effects as their metabolic and bioturbation activities. Intact riverine sediments with and without individuals of the bivalve Sinanodonta woodiana were collected in a reach with transparent water, where the occurrence of the mollusk was clearly visible. The bivalve metabolism and its effects on sedimentary fluxes of dissolved gas and nutrients were measured via laboratory incubations of intact cores under controlled conditions. S. woodiana contributed significantly to O-2 and TCO2 benthic fluxes through its respiration and to , SRP and SiO2 regeneration via its excretion. The bivalve significantly stimulated also microbial denitrification and determined a large efflux of CH4, likely due a combination of bioturbation and biodeposition activities or to anaerobic metabolism within the mollusk gut. This study demonstrates that a few, large individuals of this bivalve produce significant effects on aerobic and anaerobic benthic metabolism and nutrient mobilization. Random sediment sampling in turbid waters seldom catches these important effects due to low densities of large fauna.
引用
收藏
页码:1 / 16
页数:16
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