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Macrofaunal modification of porewater advection: role of species function, species interaction, and kinetics

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dc.creator Waldbusser, George G.
dc.creator Marinelli, Roberta L.
dc.date.accessioned 2010-12-01T00:57:02Z
dc.date.available 2010-12-01T00:57:02Z
dc.date.issued 2006-04-13
dc.identifier.citation Waldbusser, G. G., & Marinelli, R. L. (2006). Macrofaunal modification of porewater advection: role of species function, species interaction, and kinetics. Marine Ecology Progress Series, 311, 217-231. Retrieved November 30, 2010, from http://www.int-res.com/articles/meps_oa/m311p217.pdf en_US
dc.identifier.uri http://hdl.handle.net/1957/19391
dc.description This article is copyrighted by Inter Research and can be found at http://www.int-res.com/articles/meps_oa/m311p217.pdf. en_US
dc.description.abstract ABSTRACT: Sedimentary habitats are complex associations of biotic, chemical, and physical processes comprising ‘ecosystem function’. The relative importance of these processes to biogeochemical cycling in highly reactive, permeable sediments remains poorly understood. We report results from several field experiments in a muddy-sand intertidal flat dominated by 2 functionally different types of bioturbating macrofauna in False Bay, Washington, USA: (1) the arenicolid polychaete Abarenicola pacifica and (2) 2 species of thalassinid shrimp (Upogebia pugettensis and Neotrypaea californiensis). Experimental plots composed primarily of one of the study taxa or mixed communities of both were evaluated for their effects on porewater advection, solute concentrations, and sediment characteristics. Fluorescein-impregnated acrylamide gels were used to infer rates of transport, and acrylamide gel peepers were used to record porewater concentrations of diagenetically important constituents among experimental plots. Laboratory studies evaluated rates of diffusive transport in non-bioturbated sediments for comparative analysis. We found that (1) functionally different macrofauna affect rates of porewater advection in permeable sediments, (2) organism effects are not attributable to changes in average measures of sediment granulometry, (3) species interactions may further complicate the advective environment and the resulting diagenetic processes, and (4) species effects vary according to reaction rate kinetics. We hypothesize that species-related effects on transport are due to inhibition of arenicolid feeding by thalassinid tubes that serve to block sediment fluidization and advective flow. Thus, specific behaviors and interactions among organisms appear to affect transport rates and sediment function in advectively permeable habitats. The results indicate the importance of integrating behavior, kinetics, and transport into future studies of sedimentary biodiversity and ecosystem function. en_US
dc.description.sponsorship This research was supported by a Maryland Sea Grant Graduate Research Fellowship (#NA16RG2207) and an Alan Kohn Fellowship from Friday Harbor Laboratories to G.G.W. and by grants from the Office of Naval Research and Maryland Sea Grant (#SA07-5-28051Q) to R.L.M. The statements, findings, conclusions, and recommendations are those of G.G.W. and R.L.M. and do not necessarily reflect the views of Maryland Sea Grant, the National Oceanic and Atmospheric Administration, or the US Dept. of Commerce. en_US
dc.language.iso en_US en_US
dc.publisher Inter Research en_US
dc.relation.ispartofseries Marine Ecology Progress Series en_US
dc.relation.ispartofseries Vol. 311 en_US
dc.subject Species interaction en_US
dc.subject Porewater advection en_US
dc.subject Arenicolid en_US
dc.subject Thalassinid en_US
dc.subject Biogeochemistry en_US
dc.title Macrofaunal modification of porewater advection: role of species function, species interaction, and kinetics en_US
dc.type Article en_US

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