Community composition and extracellular enzyme activity of bacteria associated with suspended and sinking particles in contrasting arctic and sub-arctic marine environments
نویسنده
چکیده
Bacterial dissolution and degradation of particles is an important process in the cycling of organic matter in the ocean. Because particles are the primary vehicles for vertical export of organic material from the oceans’ productive surface layer to the deep sea, bacteria associated with marine particles contribute to the export of organic matter and to the regulation of its magnitude and composition (Turley & Mackie 1995). Studies based on size-fractionation of water column suspended samples have shown that particle-associated bacterial communities differ in composition from free-living communities (DeLong et al. 1993, Kellogg & Deming 2009) and that particle-associated bacteria are metabolically more active and have higher growth rates than free-living bacteria (Smith et al. 1992, Huston & Deming 2002, Baltar et
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