Growth Characteristics of Small and Large Free-living and Attached Bacteria in Lake Constance

Overview

Journal Microb Ecol

Specialties Environmental Health
Microbiology

Date 2013 Nov 9

PMID 24202998

Citations 4

Authors

M Simon

Affiliations

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Abstract

The growth characteristics of small (0.2-1.0μm) and large (1.0-3.0 (μm) free-living and attached bacteria were studied in Lake Constance by comparing the spatial and seasonal dynamics of their biomass turnover time (ratio of biomass/production). The biomass of small free-living bacteria usually turned over significantly faster than that of large free-living bacteria throughout the water column. The turnover of attached bacterial biomass was characterized by large fluctuations. Occasionally, in aphotic water layers, it was as long as that of large free-living bacteria, but when large amounts of decaying organic particles were present, it was shorter than that of small free-living cells. Biomass turnover times of free-living bacteria were in the same range as their generation times, which were estimated from the increase in bacterial abundance in 3μm prefiltered samples. The biomass turnover time of actively metabolizing bacteria was comparable to the generation time of actively metabolizing cells. These results indicate that the biomass turnover time is a useful indicator of the growth of different bacterial fractions, as it reflects their different amounts of participation in microbial processes of aquatic ecosystems.

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