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

被引:56
作者
Bengtsson, Mia M. [1 ,2 ]
Sjotun, Kjersti [1 ]
Storesund, Julia E. [1 ]
Ovreas, Lise [1 ,2 ]
机构
[1] Univ Bergen, Dept Biol, N-5020 Bergen, Norway
[2] Univ Bergen, Ctr Geobiol, N-5020 Bergen, Norway
关键词
Seaweed; Brown algae; Heterotrophic bacteria; Enrichment cultivation; 16S rRNA; Alginate; Laminaran; Fucoidan; DISSOLVED ORGANIC-MATTER; LAMINARIA-HYPERBOREA; TATEYAMARIA-OMPHALII; MARINE BACTERIUM; SEQUENCE DATA; BROWN-ALGAE; SP NOV; COAST; ARB; DEGRADATION;
D O I
10.3354/ame01477
中图分类号
Q14 [生态学(生物生态学)];
学科分类号
071012 ; 0713 ;
摘要
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.
引用
收藏
页码:191 / 199
页数:9
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