Document Type
Article
Department/Program
Virginia Institute of Marine Science
Publication Date
2-2006
Journal
Aquatic Microbial Ecology
Volume
42
Issue
1
First Page
19
Last Page
26
Abstract
Macroscopic aggregates (marine snow) contribute to new production and nutrient dynamics in the upper ocean and vertical fluxes of organic matter to the deep ocean. To test whether microorganisms play a significant role in phytoplankton aggregate formation we studied particle abundance and size as well as abundance, colonization behaviour, and community composition of bacteria during the growth of 2 marine diatoms (Thalassiosira weissflogii and Navicula sp.) under axenic and non-axenic conditions. Community composition of free-living and attached bacteria during phytoplankton growth and aggregation was studied by amplification of 16S rRNA gene fragments and denaturing gradient gel electrophoresis (DGGE). Our results show that the presence of bacteria was a prerequisite for aggregation of T. weissflogii but not of Navicula sp. Occurrences of distinct populations of free-living and attached bacteria depended on phytoplankton growth and aggregation dynamics. The community composition of especially attached bacteria significantly differed between the 2 algal cultures. Our study suggests that phytoplankton aggregation and vertical fluxes are closely linked to interactions between the marine phytoplankton and the ambient microbial community.
DOI
10.3354/ame042019
Recommended Citation
Grossart, HP; Kiorboe, T; Tang, KW; and al, et, Interactions between marine snow and heterotrophic bacteria: aggregate formation and microbial dynamics (2006). Aquatic Microbial Ecology, 42(1), 19-26.
10.3354/ame042019