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- Title
Bacterial Community Dynamics in a Seagrass (Posidonia oceanica) Meadow Sediment.
- Authors
Garcia-Martínez, Micaela; López-López, Arantxa; Calleja, María Li; Marbà, Nñria; Duarte, Carlos M.
- Abstract
Some traits of the bacterial community dynamics associated to the rhizosphere of the Mediterranean seagrass Posidonia ocean ica, growing in carbonate sediments, were analyzed during a 2-year period in an enclosed bay of the Balearic Islands. The diversity of the bacterial community was studied by the construction of 1 6S rDNA clone library. For testing temporal and vertical differences in the abundance of total cells and active Bacteria, we used 4',6- diamidino-2-phenylindole (DAPI) staining and fluorescence in situ hybridization (FISH). Moreover, some relevant groups of sulfate-reducing bacteria (SRB) were occasionally assessed by FISH. Despite the observed decrease in the total DAPI-stained cells, bacterial counts, and sulfate reduction rates throughout the sampling time, we found an increase in both the pore-water sulfide concentration and the proportion of SRB. Overall, the results revealed a very high bacterial diversity and indicated shifts in bacterial dynamics that could not be related to temperature-dependent factors, suggesting a link between the documented regression of the seagrass meadow and the decline of the microbial community, likely due to large organic matter inputs to the bay.
- Subjects
POSIDONIA oceanica; SEAGRASSES; RHIZOBACTERIA; BACTERIAL growth; MARINE organisms; MARINE bacteria geographical distribution
- Publication
Estuaries & Coasts, 2009, Vol 32, Issue 2, p276
- ISSN
1559-2723
- Publication type
Article
- DOI
10.1007/s12237-008-9115-y