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EnglishBioturbation 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 O2 and TCO2 benthic fluxes through its respiration and to (Formula presented.), 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.
| Data di pubblicazione: | 2017 | |
| Titolo: | Rare but large bivalves alter benthic respiration and nutrient recycling in riverine sediments | |
| Autori: | Benelli, Sara; Bartoli, Marco; Racchetti, Erica; Moraes, Paula Carpintero; Zilius, Mindaugas; Lubiene, Irma; Fano, Elisa Anna | |
| Rivista: | AQUATIC ECOLOGY | |
| Keywords: | Excretion; Fluxes; Metabolism; Sediment; Sinanodonta woodiana; Aquatic Science; Ecology, Evolution, Behavior and Systematics | |
| Abstract in inglese: | 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 O2 and TCO2 benthic fluxes through its respiration and to (Formula presented.), 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. | |
| Digital Object Identifier (DOI): | 10.1007/s10452-016-9590-3 | |
| Handle: | http://hdl.handle.net/11392/2360461 | |
| Appare nelle tipologie: | 03.1 Articolo su rivista |
File in questo prodotto:
| File | Descrizione | Tipologia | Licenza | |
|---|---|---|---|---|
| Benelli2017_Article_RareButLargeBivalvesAlterBenth.pdf | Full text (versione editoriale) |  | Open Access Visualizza/Apri |
http://hdl.handle.net/11392/2360461
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