title: Contribution of different bacterial dispersal sources to lakes: Population and community effects in different seasons.
abstract: The diversity and composition of lake bacterial communities are driven by the interplay between local contemporary environmental conditions and dispersal of cells from the surroundings, i.e. the metacommunity. Still, a conceptual understanding of the relative importance of the two types of factors is lacking. For instance, it is unknown which sources of dispersal are most important and under which circumstances. Here, we investigated the seasonal variation in the importance of dispersal from different sources (mixing, precipitation, surface runoff and sediment resuspension) for lake bacterioplankton community and population dynamics. For that purpose, two small forest lakes and their dispersal sources were sampled over a period of 10 months. The influence of dispersal on communities and populations was determined by 454 sequencing of the 16S rRNA gene and SourceTracker analysis. On the community level direct effects of dispersal were questionable from all sources. Instead we found that the community of the preceding sampling occasion, representing growth of resident bacteria, was of great importance. On the population level, however, dispersal of individual taxa from the inlet could be occasionally important even under low water flow. The effect of sediment resuspension and precipitation appeared small.
authors.affiliation: Department of Ecology and Genetics/Limnology, Uppsala University, Norbyvägen 18D, Uppsala, 75236, Sweden.
authors.forename: Jérôme
authors.initials: J
authors.lastname: Comte
authors.affiliation: Department of Ecology and Genetics/Limnology, Uppsala University, Norbyvägen 18D, Uppsala, 75236, Sweden.|Biological Oceanography, Leibniz-Institute for Baltic Sea Research, Warnemünde (IOW), Seestrasse 15, Rostock, Germany.
authors.forename: Mercè
authors.initials: M
authors.lastname: Berga
authors.affiliation: Department of Ecology and Genetics/Limnology, Uppsala University, Norbyvägen 18D, Uppsala, 75236, Sweden.
authors.forename: Ina
authors.initials: I
authors.lastname: Severin
authors.affiliation: Department of Ecology and Genetics/Limnology, Uppsala University, Norbyvägen 18D, Uppsala, 75236, Sweden.
authors.forename: Jürg Brendan
authors.identifier: 0000-0001-8838-0914
authors.initials: JB
authors.lastname: Logue
authors.affiliation: Department of Ecology and Genetics/Limnology, Uppsala University, Norbyvägen 18D, Uppsala, 75236, Sweden.
authors.forename: Eva S
authors.identifier: 0000-0001-8920-3071
authors.initials: ES
authors.lastname: Lindström
mesh_terms: D039903:Actinobacteria / Q000145:classification / Q000235:genetics / Q000378:metabolism*; D002980:Climate; D019015:Geologic Sediments / Q000382:microbiology*; D060106:Lakes / Q000382:microbiology*; D064307:Microbiota / Q000235:genetics / Q000502:physiology*; D010933:Plankton / Q000145:classification / Q000235:genetics / Q000378:metabolism*; D011157:Population Dynamics; D020560:Proteobacteria / Q000145:classification / Q000235:genetics / Q000378:metabolism*; D012336:RNA, Ribosomal, 16S / Q000235:genetics; D012621:Seasons
chemical_list: D012336:RNA, Ribosomal, 16S