Abstract
Bivalves serve an important ecosystem function in delivering organic matter from pelagic to benthic zones and are important in mediating eutrophication. However, the fate of this organic matter (i.e., biodeposits) is an important consideration when assessing the ecological roles of these organisms in coastal ecosystems. In addition to environmental conditions, the processing of biodeposits is dependent on its composition and the metabolic capacity of the associated microbial community. The objectives of this study were to compare the biological reactivity, potential denitrification rates, and microbial communities of biodeposits sourced from different bivalve species: hard clam (Mercenaria mercenaria), eastern oyster (Crassostrea virginica), and ribbed mussel (Geukensia demissa). To our knowledge, this is the first study to investigate and compare the microbiome of bivalve biodeposits using high-throughput sequencing and provide important insight into the mechanisms by which bivalves may alter sediment microbial communities and benthic biogeochemical cycles. We show that clam biodeposits had significantly higher bioreactivity compared to mussel and oyster biodeposits, as reflected in higher dissolved inorganic carbon and ammonium production rates in controlled incubations. Potential denitrification rates were also significantly higher for clam biodeposits compared to oyster and mussel biodeposits. The microbial communities associated with the biodeposits were significantly different across bivalve species, with significantly greater abundances of Alteromonadales, Chitinophagales, Rhodobacterales, and Thiotrichales associated with the clam biodeposits. These bioreactivity and microbial differences across bivalve species are likely due to differences in bivalve physiology and feeding behavior and should be considered when evaluating the effects of bivalves on water quality and ecosystem function.








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Acknowledgements
Many thanks to Jennifer Stanhope and Hunter Walker at VIMS for the logistical and laboratory support. Discussions with Ashley Smyth and Lisa Kellogg greatly improved this research effort. This work was supported by the VIMS Research Experiences for Undergraduates program through grants awarded from the National Science Foundation (grant # NSF OCE 1062882) to Linda Schaffner and Rochelle Seitz, Virginia Sea Grant (NA10OAR4170085, #R/71515W) awarded to A. Murphy, grant #NSF OCE 1233801 awarded to BK Song, and NSF Virginia Coast Reserve Long Term Ecological Research (LTER 0080381, 0621014).
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Murphy, A.E., Kolkmeyer, R., Song, B. et al. Bioreactivity and Microbiome of Biodeposits from Filter-Feeding Bivalves. Microb Ecol 77, 343–357 (2019). https://doi.org/10.1007/s00248-018-01312-4
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DOI: https://doi.org/10.1007/s00248-018-01312-4

