Törnblom, E. Institute of Limnology, Uppsala University, erik.tornblom@limno.uu.se
Sřndergaard, M. Freshwater Biological Laboratory, University of Copenhagen, flabms@inet.uni2.dk

 
ACTIVITY AND BIOMASS OF BACTERIA ATTACHED TO EELGRASS, ZOSTERA MARINA L. AND OF PEALAGIC BACTERIA: A SYSTEMS COMPARISON
 
The seasonal variation in abundance and production of pelagic bacteria and bacteria attached to eelgrass were followed in the Roskilde Fjord, Denmark. A dual labelling method with 14C-leucine and 3H-thymidine was used to estimate bacterial production. Bacterial productivity on eelgrass leaves ranged between 0.01 and 1.3 µg C cm-2 leaf area h-1. Bacterial biomass and production exhibited significant increases with increasing leaf age and from leaf bases to leaf tips. Specific growth rates of attached bacteria were on average 15 times higher than pelagic bacteria and in the same size of order as exponentially growing bacterial cultures. When extrapolated to the surrounding the fjord the production of bacteria attached to eelgrass was 34 g C m-2 to be compared with 129 g C m-2 for pelagic bacteria over the 14 months studied. At maximum eelgrass coverage, bacterial production was similar for attached and pelagic bacteria.
 
Day: Tuesday, Feb. 2
Time: Poster
Location: Sweeney Center
 
Code: SS17TU0362S