We investigated the bacterioplankton dynamics at Helgoland Roads in the North Sea over the winter-spring transition. The bacterial community was analysed and correlated with phytoplankton community data and abiotic parameters. The bacterial diversity was analysed by RISA (Ribosomal Intergenic Spacer Analysis) and by DGGE (Denaturing Gradient Gel Electrophoresis) of 16S rRNA genes followed by DNA sequence analysis. The linkage of abiotic and biotic environmental factors and bacterial community as well as phylotypes was analysed by the ordination technique of Canonical Correspondance Analysis (CCA). Generally, an influence of temperature and phytoplankton on the bacterial community during the sampling period was observed. Additionally, multivariate analysis by factors revealed an influence on specific bacterial phylotypes by these factors. Overall, our results indicate that changes in the bacterial community were caused not only by abiotic factors but also by the phytoplankton community.
Helmholtz Research Programs > MARCOPOLI (2004-2008) > CO2-Coastal diversity - key species and food webs