首页|Apatococcus lobatus (Trebouxiophyceae) dominates green algal biofilms on roof tiles in Northern Germany
Apatococcus lobatus (Trebouxiophyceae) dominates green algal biofilms on roof tiles in Northern Germany
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NSTL
Gebruder Borntraeger
Aeroterrestrial green algae form striking biofilms on many man-made substrates. While biomass growth and decline of green algal biofilms are linked to seasonality, the variability of their species composition in consequence of seasonally changing abiotic conditions has not been investigated yet under an oceanic climate. Few snapshot-like studies exist, but systematic studies on the seasonal dynamics of such communities are lacking. Therefore, green algal biofilms were regularly sampled on roof tiles for 12 months at an outdoor weathering stand, and analyzed by direct microscopy and a molecular finger-print technique (DGGE). In parallel, subsamples were incubated in enrichment media and the resulting algal communities were again evaluated and determined using morphological and molecular markers. The data indicate the permanent dominance of Apatococcus lobatus (Chodat) J.B.Petersen 1928 (50???100%) over the course of the seasons with only temporarily co-occurring green algal taxa. In contrast, in enrichment culture A. lobatus was less abundant, while other genera (Chlorella, Chloroidium, Stichococcus) dominated. The natural biofilms are characterized by low algal biodiversity and high abundance of A. lobatus, which can be explained by a combination of morphological ecophysiological, biochemical adaptive traits and a high competitive strength.
NSTL
Gebruder Borntraeger
