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Here, we assessed resource partitioning among freshwater bacterial groups from two oligotrophic lakes using four types of organic substrates as compound models. Substrate uptake patterns were examined by microautoradiography combined with catalysed reporter deposition fluorescent\n                    <jats:italic>in situ<\/jats:italic>\n                    hybridization. Four large taxonomic groups were found in the lakes, but\n                    <jats:styled-content style=\"fixed-case\">\n                      <jats:italic>A<\/jats:italic>\n                    <\/jats:styled-content>\n                    <jats:italic>ctinobacteria<\/jats:italic>\n                    (\n                    <jats:styled-content style=\"fixed-case\">AcI<\/jats:styled-content>\n                    lineage) and\n                    <jats:styled-content style=\"fixed-case\">\n                      <jats:italic>B<\/jats:italic>\n                    <\/jats:styled-content>\n                    <jats:italic>etaproteobacteria<\/jats:italic>\n                    (\n                    <jats:styled-content style=\"fixed-case\">R<\/jats:styled-content>\n                    \u2010\n                    <jats:styled-content style=\"fixed-case\">BT<\/jats:styled-content>\n                    cluster) dominated the bacterial assemblage. Monomers containing nitrogen and\/or phosphorus were preferred over the ones containing only carbon. All groups were able to incorporate amino acids, adenosine triphosphate and glucose. However, acetate was only taken up by \u223c\u200910\u201312% of bacteria, and its uptake was not detected in\n                    <jats:styled-content style=\"fixed-case\">\n                      <jats:italic>C<\/jats:italic>\n                    <\/jats:styled-content>\n                    <jats:italic>ytophaga<\/jats:italic>\n                    \u2010\n                    <jats:styled-content style=\"fixed-case\">\n                      <jats:italic>F<\/jats:italic>\n                    <\/jats:styled-content>\n                    <jats:italic>lavobacteria<\/jats:italic>\n                    . Apart from acetate, the contribution of a particular bacterial group to the uptake of a substrate was proportional to its relative abundance. In both lakes, we detected substrate partitioning between\n                    <jats:styled-content style=\"fixed-case\">AcI<\/jats:styled-content>\n                    \u2005\n                    <jats:italic>Actinobacteria<\/jats:italic>\n                    , which was overrepresented in glucose and acetate utilization, and\n                    <jats:styled-content style=\"fixed-case\">R<\/jats:styled-content>\n                    \u2010\n                    <jats:styled-content style=\"fixed-case\">\n                      BT\n                      <jats:italic>B<\/jats:italic>\n                    <\/jats:styled-content>\n                    <jats:italic>etaproteobacteria<\/jats:italic>\n                    , which dominated amino acid uptake. Our results strongly point to physiological niche separation of those bacterial groups in alpine lakes.\n                  <\/jats:p>","DOI":"10.1111\/1758-2229.12240","type":"journal-article","created":{"date-parts":[[2014,11,18]],"date-time":"2014-11-18T06:26:47Z","timestamp":1416292007000},"page":"265-272","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":13,"title":["Dissolved organic monomer partitioning among bacterial groups in two oligotrophic lakes"],"prefix":"10.1111","volume":"7","author":[{"given":"Mar\u00eda Teresa","family":"P\u00e9rez","sequence":"first","affiliation":[{"name":"Lake and Glacier Research Group Institute of Ecology University of Innsbruck  Technikerstrasse 25 6020 Innsbruck Austria"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Carina","family":"Rofner","sequence":"additional","affiliation":[{"name":"Lake and Glacier Research Group Institute of Ecology University of Innsbruck  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