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Total and phytoplankton mediated bottom-up control of bacterioplankton change with temperature in NE Atlantic shelf waters

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dc.contributor.author Moran, Xose Anxelu G.
dc.contributor.author Calvo-Diaz, Alejandra
dc.contributor.author Ducklow, Hugh W.
dc.date.accessioned 2011-05-04T16:11:41Z
dc.date.available 2011-05-04T16:11:41Z
dc.date.issued 2010-01-20
dc.identifier.citation Aquatic Microbial Ecology 58 (2010): 229-239 en_US
dc.identifier.uri http://hdl.handle.net/1912/4544
dc.description Author Posting. © Inter-Research, 2010. This article is posted here by permission of Inter-Research for personal use, not for redistribution. The definitive version was published in Aquatic Microbial Ecology 58 (2010): 229-239, doi:10.3354/ame01374. en_US
dc.description.abstract The regulation of heterotrophic bacterial growth by resource supply (bottom-up control) was temperature-dependent in our analysis of data obtained during 2006 in the euphotic layer of the southern Bay of Biscay (NE Atlantic) continental shelf. The dataset was split into 2 subgroups using 16°C as the boundary between warm and cool waters based on differences in associated physico-chemical conditions, e.g. inorganic nutrient limitation at higher temperatures. The linear regressions between bacterial biomass (BB) and leucine incorporation rates (LIR) were significantly positive in both temperature regimes, thus indicating similar total bottom-up control, albeit with a slightly higher slope in warm waters (0.33 vs. 0.22). However, the relationship of LIR with phytoplankton biomass (chl a), which is an indicator of bottom-up control that is mediated by phytoplankton, was only significant in waters below 16°C. The analysis of bimonthly variations in the BB-LIR and LIR-chl a correlations indicated that the strength of total bottom-up control significantly increased while the role of phytoplankton in supplying DOM to bacteria diminished with mean temperatures over the 12 to 19°C range, suggesting a seasonal switch in the major source of substrates used by bacteria. We show that the abundance of cells with relatively high nucleic acid content (HNA), which are hypothesized to be the most active ones, was positively associated with bacterial production and specific growth rates in cool but not in warm conditions. These results suggest that HNA bacteria are good predictors of bulk activity and production in temperate ecosystems only when the community relies principally on phytoplankton substrates for growth and metabolism. en_US
dc.description.sponsorship X.A.G.M. was partially supported by a sabbatical grant at the MBL from the Spanish Ministry of Education and Science (MEC) and A.C.-D. received an FPI research training predoctoral fellowhip. This work was supported by the time-series project RADIALES from the Instituto Espanol de Oceanografia (IEO). en_US
dc.format.mimetype application/pdf
dc.language.iso en en_US
dc.publisher Inter-Research en_US
dc.relation.uri http://dx.doi.org/10.3354/ame01374
dc.subject Bacterioplankton en_US
dc.subject Bottom-up control en_US
dc.subject Temperature en_US
dc.subject Bacterial biomass en_US
dc.subject Bacterial activity en_US
dc.subject Phytoplankton en_US
dc.subject Coastal waters en_US
dc.title Total and phytoplankton mediated bottom-up control of bacterioplankton change with temperature in NE Atlantic shelf waters en_US
dc.type Article en_US
dc.identifier.doi 10.3354/ame01374


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