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Abundance and morphotype diversity of surface bacterioplankton along the Gdynia - brest transect

Żmuda M. J.

Oceanological and Hydrobiological Studies

2005

Vol. 34, No.4

3--17

Abundance, biomass and morphotype diversity of bacterioplankton were analyzed in surface samples collected on a transect from Gdynia (Poland) to Brest (France) between 5 and 17 October, 2002. The total bacterial number ranged from 1.52 x 105 š 7.0 x 103 ml-1 (SE) to 4.08 x 106 š 3.1 x 105 ml-1. Samples from the Baltic Sea showed both the highest number of bacteria and the largest variability. Total bacterial biomass ranged from 5.45 š 0.99 to 128.17 š 13.58 ěg C l-1. The dominant morphotype were rods (82.4% to 95.7%) especially those with average cell volume below 0.1 ěm3. Regional differences in the average cell volume ranged from 0.099 to 0.382 ěm3. Autotrophic bacteria comprised on average 13.5 % of total bacterioplankton biomass, but increased to 48% at the west side of the English Channel. The high bacterial abundances discussed here shed light on the importance of the ocean surface as a habitat for prokaryotes and as a reservoir of bacterial biomass.