ISSN:
1365-2427
Source:
Blackwell Publishing Journal Backfiles 1879-2005
Topics:
Biology
Notes:
1. The development of a population of Thiocystis minor (formerly Chromatium minus) in the deepest, anoxic layers of Moncortès Lake (Lleida, Spain) was studied by means of an in situ, laser particle analyser. Particle size distribution was measured at hourly and monthly time intervals.2. The population was located between the redoxcline (∼3 m below the mean population depth) and the oxycline (∼6 m above the mean population depth) with a seasonal vertical displacement (SVD) of up to 6 m (from April to October).3. Diel vertical migration of the population was followed in three field campaigns, when the population was most abundant. The largest vertical displacement was 2.8 m (in 11.5 h) and the fastest vertical displacement was 0.6 m h−1. Sudden changes in the irradiance reaching the bacterial population were detected by the cells, which moved up or down, rapidly modifying the mean vertical position of the population.4. There was positive phototaxis with an ascent during the morning and a descent during the afternoon/night. The whole population was active while migrating upwards (towards higher light intensity) or downwards (towards lower redox concentration).
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1046/j.1365-2427.2003.01039.x
