. Cottage country : an environmental manual for cottagers. Cottages; Vacation homes; Environmental protection; Pollution. 7^<u^£«<}% Ca\PTERI Countless factors affect} our lake's water quality. Some you can do some- tiling about. Some you can't. In either case, you should know the facts. Let's look at the major influences. Good Bacteria, Bad Bacteria For the sake of simplicity, water micro-organisms can be divided into two groups: 1. bacteria that thrive in a lake envi- ronment and make up the natural bacterial flora; and 2. disease-causing micro-organisms, called pathogens, which can in
. Cottage country : an environmental manual for cottagers. Cottages; Vacation homes; Environmental protection; Pollution. 7^<u^£«<}% Ca\PTERI Countless factors affect} our lake's water quality. Some you can do some- tiling about. Some you can't. In either case, you should know the facts. Let's look at the major influences. Good Bacteria, Bad Bacteria For the sake of simplicity, water micro-organisms can be divided into two groups: 1. bacteria that thrive in a lake envi- ronment and make up the natural bacterial flora; and 2. disease-causing micro-organisms, called pathogens, which can infect human tissues. Tlie pathogens are generally intro- duced to an aquatic environment by raw or inadequately treated sewage, althougli a few are found naturally in the soil. Other sources of patliogens include cats and dogs, chipmunks and even loons. The presence of these bacteria does not change (he appearance of water, but it poses an immediate health hazard if the w ater is used for drinking or swimming (hence, the ob- vious need to disinfect the water sup- ply from the lake). This hazard does not necessarily mean that you will contract such seri- ous waterborne infections as typhoid fever, polio or hepatitis, but you may catch the less serious gastroenteritis (stomach flu). dysentery or diarrhea. Included in this minor category arc eye, ear and throat infections that .swimmers encounter every year and the more insidious, but seldom diag- nosed, subclinical infections usually associated with several waterborne viruses. This type of microbial pollution can be remedied by preventing wastes from reaching the lake. Since disease- causing bacteria usually do not thrive in an aquatic environment, water quality should return to satisfactory conditions within approximately one year after remedial measures are implemented TheEfifectof Bacteria on Oxygen The remaining bacteria, instruments of normal and necessary decay, live and thrive within a lake environment. Any organic matter
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