Biomass, production, and specific growth rate of bacterioplankton and coupling to phytoplankton in an oligotrophic lake

摘要: Production of bacterioplankton and phytoplankton was analyzed in oligotrophic Lawrence Lake, Michigan, over a 2-yr period. Variables examined were temperature, bacterial numbers biovolumes, production specific growth rates (p), phytoplanktonic biomass production, alkaline phosphatase activity. Algal varied similarly on temporal spatial scales ; some differences vertical patterns evident during summer stratification. Values for μ ranged from 0.2 d -1 winter to 2.6 d-' midsummer. Decreases bacteria coincided with the onset heavy CaCO 3 precipitation increased activities. close predicted maximal values periods mixing but depressed upper layers summer. Temperature showed significant bivariate rank correlations all variables. With temperature controlled, did not show partial algal chlorophyll or consistent minor role dissolved organic carbon growth. Low high estimates bacterioplanktonic 2 yr exceeded that by factors 1.33 3.35. Net metabolism pelagic zone heterotrophic, state likely maintained littoral macrophytic periphytic production. Apparent coupling between phyto- stemmed mainly similar responses each component common regulating rather than direct metabolic links.