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Changes in Pelagic Bacteria Communities Due to Leaf Litter Addition

  • Environmental Microbiology
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Abstract

In many limnetic systems, the input of allochthonous organic matter, e.g., leaf litter, is a substantial source of dissolved organic carbon (DOC) for pelagic bacteria, especially in fall and winter when autochthonous DOC production is low. However, relatively little is known about community changes of pelagic lake bacteria due to leaf litter input which includes both the release of leaf leachates and microorganisms from the leaf litter into the surrounding water. Therefore, we have experimentally studied the effects of different types of leaf litter (Betula pendula, Fagus silvatica, and Pinus silvestris) on the pelagic bacterial community composition by adding leaves to different treatments of epilimnic water samples (unfiltered, 0.2 µm and 5.0 µm-pre-filtered) from humic Lake Grosse Fuchskuhle (Northeastern Germany). The addition of leaf litter led to a significant increase in DOC concentration in lake water, and each leaf litter type produced significantly different amounts of DOC (p = <0.001) as well as of specific DOC fractions (p = <0.001), except of polysaccharides. DGGE banding patterns varied over time, between types of leaf litter, and among treatments. Bacteria belonging to known bacterial phylotypes in the southwest basin of Lake Grosse Fuchskuhle were frequently found and even persisted after leaf litter additions. Upon leaf litter addition, α-proteobacteria (Azospirillum, Novosphingobium, and Sphingopyxis) as well as β-proteobacteria (Curvibacter and Polynucleobacter) were enriched. Our results indicate that supply of leaf litter DOM shifted the bacterial community in the surrounding water towards specific phylotypes including species capable of assimilating the more recalcitrant DOC pools. Statistical analyses, however, show that DGGE banding patterns are not only affected by DOC pools but also by treatment. This indicates that biological factors such as source community and grazing may be also important for shifts in bacterial community structure following leaf litter input into different lakes.

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Acknowledgments

We thank E. Mach for the technical assistance during sampling and for the measurement of dissolved organic carbon, Sonja Raub for many useful comments in writing the first version of this manuscript, and Sarah Poynton for the language and manuscript revisions. This work was supported by a PhD scholarship to KMLHS from the Deutscher Akademischer Austauschdienst (DAAD), a course travel grant from Boehringer Ingelheim Fonds given to KMLHS, and by the Leibniz Foundation.

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Correspondence to Hans-Peter Grossart.

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ESM Table 1

Phylogenetic affiliation of sequenced DGGE bands in a) Betula—Betula pendula, b) Fagus—Fagus silvatica, c) Pinus—Pinus silvestris additions over a 28-day period, and d comparison of the BCC in Betula, Fagus, and Pinus additions at the end of the incubation. α (Alphaproteobacteria), β (Betaproteobacteria), γ (Gammaproteobacteria), B (Bacteroidetes), Ad (Acidobacteria), and C (Cyanobacteria). Accession numbers of the sequenced DGGE bands as well as a brief description,% similarity, and accession numbers of the nearest published relative and the nearest isolate relative (based on NCBI results) are given (DOC 194 kb)

ESM Fig. 1

DGGE gels of temporal changes in BCC after addition of a) Betula—Betula pendula, b) Fagus—Fagus silvatica, c) Pinus—Pinus silvestris additions at the end of the incubation. T 0 = time zero, FL = free-living bacteria, PA = particle-associated bacteria. α (Alphaproteobacteria), β (Betaproteobacteria), γ (Gammaproteobacteria), B (Bacteroidetes), Ad (Acidobacteria), and C (Cyanobacteria). Sequenced bands are marked by arrows and their respective band numbers. Detailed phylogenetic characterizations are given in Table S1a–d for Fig. 8 a–d, respectively. Pre-treatment of water samples are given as <0.2, <5.0, UNF, and AUT (for details see text) (DOC 435 kb)

ESM Fig. 2

NMS ordination plots of DGGE banding patterns after addition of leaf litter from a) Betula—Betula pendula, b) Fagus—Fagus silvatica, c) Pinus—Pinus silvestris over a 28-day period. T 0 = time zero, d 7–28 = days of incubation, FL = free-living bacteria, PA = particle-associated bacteria. Pre-treatment of water samples are given as <0.2, <5.0, UNF, and AUT (for details see text) (DOC 85 kb)

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Hutalle-Schmelzer, K.M.L., Zwirnmann, E., Krüger, A. et al. Changes in Pelagic Bacteria Communities Due to Leaf Litter Addition. Microb Ecol 60, 462–475 (2010). https://doi.org/10.1007/s00248-010-9639-0

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