AME 62:191-199 (2011)  -  DOI:

Utilization of kelp-derived carbon sources by kelp surface-associated bacteria

Mia M. Bengtsson1,2,*, Kjersti Sjøtun1, Julia E. Storesund1, Lise Øvreås1,2

1Department of Biology, and 2Centre for Geobiology, University of Bergen, Box 7803, 5020 Bergen, Norway

ABSTRACT: The surfaces of kelp are covered with bacteria that may utilize kelp-produced carbon and thereby contribute significantly to the carbon flux in kelp forest ecosystems. There is scant knowledge about the identity of these bacteria and about which kelp-derived carbon sources they utilize. An enrichment approach, using kelp constituent carbon sources for bacterial cultivation, was used to identify bacterial populations associated with the kelp Laminaria hyperborea that degrade kelp components. In order to assess whether the cultured bacteria are significant under natural conditions, partial 16 rRNA gene sequences from the cultured bacteria were compared to sequences obtained from the indigenous bacterial communities inhabiting natural kelp surface biofilms. The results identify different members of the Roseobacter clade of Alphaproteobacteria in addition to members of Gammaproteobacteria that are involved in kelp constituent degradation. These bacteria are observed sporadically on natural kelp surfaces and may represent opportunistic bacteria important in degradation of dead kelp material. Many of the cultured bacteria appear to be generalists that are able to utilize different kelp carbon sources. This study is the first to link culturable kelp-associated bacteria with their occurrence and possible roles in the natural environment.

KEY WORDS: Seaweed · Brown algae · Heterotrophic bacteria · Enrichment cultivation · 16S rRNA · Alginate · Laminaran · Fucoidan

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Cite this article as: Bengtsson MM, Sjøtun K, Storesund JE, Øvreås J (2011) Utilization of kelp-derived carbon sources by kelp surface-associated bacteria. Aquat Microb Ecol 62:191-199.

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