Experiments and observations on the phytoplankton of certain lakes in the English Lake District were made from early 1973 to the end of March, 1974. They included laboratory and lake bioassays and observations on the quantity and quality of the phytoplankton in six lakes. The introductory sections of the report are about algae, the ecology of phytoplankton and the scope of the contracted work. Laboratory bioassays on water from one lake, Blelham Tarn, showed that phosphorus, silicon (for diatoms) and organic substances forming complexes with iron were the major substances limiting the growth of the algae tested. The growth of the test algae was limited to different degrees by those substances and, to some extent, to a greater or lesser degree at different times of year. It is suggested that a relatively simple form of bioassay could give valuable information to water undertakings. Lake bioassays and other experiments were carried out by using large in situ tubular plastic enclosures. Two such investigations are described. The effects of a change in sewerage in two drainage basins on the phytoplankton of three lakes is described and some data given about changes since 1945 in three other lakes in the same overall drainage basin. These latter lakes have been affected too by changes in sewerage and by increasing inputs of domestic and agricultural wastes. Throughout, the relevance of the work done to practical problems of water usage is kept in mind and discussed. In the last section special reference is made to the largely unpredictable results of water transfers. The report ends with a note on river phytoplankton.
显示更多 [+] 显示较少 [-]
AGRIS - 国际农业科技情报系统
Share
出版者
Freshwater Biological Association, Ambleside, UK
其它主题
Bioassays; English lake district; Nutrients (mineral); Controlled conditions
语言
英语
格式
application/pdf, application/pdf, 64, application/pdf
类型
Book; Monograph
来源
http://aquaticcommons.org/id/eprint/5281, 1256, 2011-09-29 15:11:31, 5281, Freshwater Biological Association
2024-06-20
2026-02-03
Dublin Core