ISSN:
1432-184X
Source:
Springer Online Journal Archives 1860-2000
Topics:
Biology
Notes:
Abstract A method of simultaneously quantifying photoautotrophic (algae and cyanobacteria) and bacterial production in periphyton communities by 14C-bicarbonate and 3H-leucine incorporation was investigated and applied to communities subjected to specific intensities of photosynthetically active radiation (400–700 nm). Maximum photosynthetic output (2.23 ± 0.29 (SE) μg C cm-2 h-1) and bacterial production (0.07 ± 0.006 μg C cm-2 h-1) occurred at the highest photon flux density (400 μmol m-2 s-1). Over a photon flux density range of 20–400 μmol m-2 s-1, bacterial and autotroph productivity were significantly and positively correlated (r = 0.89). Furthermore, application of 3-(3,4-dichlorophenyl)-1,1-dimethyl urea, a photosystem 11 inhibitor, to periphyton films reduced bacterial production by 46%, but it had no such effect on bacteria-only cultures. Therefore, the magnitude of bacterial production in periphyton was coupled to the photosynthesis/metabolism of algae and/or cyanobacteria.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00171931
