Fatty acid profiling of microbial community during aging of mucilaginous aggregates in the northern Adriatic

Aggregates differing in size and phytoplankton community composition were sampled in winter/spring 2001 and summer 1997 and 2002 (during mucilaginous event) in the northern Adriatic Sea. The fatty acid profiles (FAME) were determined in aggregates, bacterial population was grown from each aggregate...

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Bibliographic Details
Published in:The Science of the total environment 2005-01, Vol.336 (1), p.91-103
Main Authors: Blažina, Maria, Najdek, Mirjana, Fuks, Dragica, Degobbis, Danilo
Format: Article
Language:English
Subjects:
Aggregates
Animal, plant and microbial ecology
Bacillariophyceae
Bacteria
Biological and medical sciences
Cylindrotheca closterium
Diatoms
Environmental Monitoring
Fatty acid composition
Fatty Acids - analysis
Fundamental and applied biological sciences. Psychology
Italy
Marine
Microbial ecology
Northern Adriatic
Phytoplankton
Proteobacteria
Seasons
Seawater
Time Factors
Various environments (extraatmospheric space, air, water)
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Summary:Aggregates differing in size and phytoplankton community composition were sampled in winter/spring 2001 and summer 1997 and 2002 (during mucilaginous event) in the northern Adriatic Sea. The fatty acid profiles (FAME) were determined in aggregates, bacterial population was grown from each aggregate and each bacterial isolate from aggregate's plated cultures. All aggregates irrespective of the season, aggregate size or phytoplankton community composition contained isolates from three distinct groups, with fatty acid profiles corresponding to α- Proteobacteria, γ -Proteobacteria and Cytophaga– Flavobacter (CF) complex but in different relative proportions. Fatty acid profiles of the bacterial population grown from each aggregate revealed either the domination of one group (γ, α or CF) or contribution of more groups (γ and CF; α and CF). Specifically, as the aggregates age a shift in favor of bacteria belonging to CF-complex and corresponding decrease in bacteria similar to that of Proteobacteria occur. During the aggregate aging process and degradation of the mucous matrix, besides bacterial succession, the phytoplankton growth took place inside the aggregates. Such an aging pattern was confirmed through laboratory experiments with aggregates inhabited by the diatom Cylindrotheca closterium.
ISSN:0048-9697
1879-1026
DOI:10.1016/j.scitotenv.2004.05.029