Life strategy and phosphorus relations of the cyanobacterium Gloeotrichia echinulata in an oligotrophic Precambrian Shield lake.
Tymowski, R. G.; Duthie, H. C.
published: Jun 14, 2000
ArtNo. ESP141014803006, Price: 29.00 €
Experiments to measure phosphorus uptake by the cyanobacterium Gloeotrichia echinulata (J. E. SMITH) RICHTER from lake sediments and from epilimnetic water show that phosphorus accumulated from the sediments by benthic colonies plays an important role in the development of planktonic populations, whereas uptake from epilimnetic water by vegetative colonies is insignificant. During the spring and summer of 1996, the cellular phosphorus quota of both benthic and epilimnetic Gloeotrichia colonies was monitored in the oligotrophic Peninsula Lake, central Ontario, Canada, in order to detect signs of luxury uptake and subsequent utilisation during growth. Assays were also used to measure the rate of phosphorus uptake from the sediment and from lake water. G. echinulata, which overwinters in the form of the benthic akinete packets, is capable of obtaining phosphorus directly from the sediments following germination in early summer, and subsequent growth in the epilimnion is based almost entirely on accumulated reserves.