Distribution and Life Strategies of Two Bacterial Populations in a Eutrophic Lake

摘要: Monoclonal antibodies and epifluorescence microscopy were used to determine the depth distribution of two indigenous bacterial populations in stratified Lake Plussee characterize their life strategies. Populations Comamonas acidovorans PX54 showed a with maximum abundances oxic epilimnion, whereas Aeromonas hydrophila PU7718 anoxic thermocline layer (metalimnion), i.e., water highest microbial activity. Resistance protist grazing high metabolic versatility growth rate most important strategy traits for explaining populations. Maximum abundance was 16,000 cells per ml, 20,000 ml. Determination productivity dilution cultures different-size fractions dissolved organic matter (DOM) from lake indicates that low-molecular-weight (LMW) DOM is less bioreactive than total (TDOM). The TDOM fractions, those LMW fraction, demonstrating can grow well on fraction. We estimated 13 24% entire community 14% removed by viral lysis, no significant effect lysis could be detected. Growth rates (0.11 0.13 h−1) higher (0.04 0.08 but lower (0.26 0.31 h−1). In undiluted cultures, significantly lower, pointing density effects such as resource limitation or antibiosis, stronger PX54. Life characterizations based data literature this study revealed fast-growing metabolically versatile A. an r-strategist opportunistic population Plussee, grazing-resistant C. rather K-strategist equilibrium population.