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- W2520624716 endingPage "1048" @default.
- W2520624716 startingPage "1036" @default.
- W2520624716 abstract "Freshwater bacteria play key roles in biogeochemical cycling and contribute significantly to biomass and energy fluxes. However, studies of Great Lakes ecosystem dynamics often omit bacteria. Here, we used high throughput sequencing to analyze how bacterial diversity and community composition (BCC) vary seasonally along the long-term Muskegon estuary to pelagic research transect. Diversity was higher in the estuary than Lake Michigan, in spring compared to summer, and for particle-associated (PA) relative to free-living (FL) fractions. PA communities were distinct from and more variable than FL communities. For both fractions, spring BCC was more similar between estuary and nearshore Lake Michigan compared to offshore waters. In summer and fall, nearshore and offshore BCC were more similar compared to estuary BCC. Most abundant taxa were inferred to be chemoorganoheterotrophs. While, as a whole, this functional group only showed habitat preference for the PA fraction, we observed phylum- and class-level seasonal and spatial preferences. Chemoorganoheterotrophs that also perform bacteriorhodopsin-mediated phototrophy, such as acI Actinobacteria and LD12, strongly preferred FL fractions. Photoautotrophs (Cyanobacteria) were least abundant in spring, when mixotrophic methylotrophs were more abundant, particularly in the estuary. Organisms with chemolithotrophic capabilities, including a mixotrophic, highly abundant Limnohabitans (Lhab-A1) OTU, showed limited spatiotemporal patterns. One exception was Nitrosospira, an autotrophic ammonium oxidizer, which peaked in deep offshore waters in fall. Nitrosospira co-occurred with Chloroflexi CL500-11, which likely mineralizes nitrogen-rich organic matter in deep waters. These spatiotemporal BCC shifts suggest differences in bacterially mediated elemental cycling along estuary to pelagic gradients in Lake Michigan." @default.
- W2520624716 created "2016-09-23" @default.
- W2520624716 creator A5033151097 @default.
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- W2520624716 creator A5050053379 @default.
- W2520624716 creator A5060407900 @default.
- W2520624716 creator A5072062637 @default.
- W2520624716 creator A5077473278 @default.
- W2520624716 date "2016-10-01" @default.
- W2520624716 modified "2023-09-30" @default.
- W2520624716 title "Spatiotemporal distribution of bacterioplankton functional groups along a freshwater estuary to pelagic gradient in Lake Michigan" @default.
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