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Lethbridge Herald Newspaper Archives

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Lethbridge Herald, The (Newspaper) - January 23, 1973, Lethbridge, Alberta January 13, 1973 THE LETHBRIDCE HERALD 13 Henderson Lake presents science a problem By DR. J. R. AI.LA.V Physiologist Lelhbridgc Research Stelion One of the most pleasant places to relax today is by a peaceful lake, whether it is in a secluded forest or the centre of a growing city. Citizens of Lethbridge are particularly to have in their midst Henderson Lake, 70 acres of wafer bordered by a nicely developed park, a golf course, and a Japanese garden. A lake of this kind comprises a nonliving component the environment, and three living components the plants, the animals, and the microbes. All four components are closely through energy chains End nutrient cycles. The environment involves the physi- cal factors of tempera- ture, sunlight, and wind as well as chemical factors nutrients dissolved in the water and bound to (he soil of the lake bed. The aquatic plants of a lake rie considered to be the "pro- ducers." They need nutrients in the same way that terrestrial plants need them. TTJUS. a lack of nitrogen or phosphorus inhi- bits their development whereas an excess overstimuJates it. Aquatic plants use nutrients, sunlight, aid carbon dioxide to make the substances needed for crowth and give off oxygen. i ike Iheir Cvuiaorparts on land, aquauc plan's an? crazed by various forms pf pninnl life [he "misur.iors.'1 Some of consumers food directly on use ihe larger plants Tor The larger cc-issiuner? feed on ihe srr.rJ! cor.sijrrers and sa oa through the ?ysrem. The iriic.-cb.f3 or bscteria the break ro-vn the plant ma- terial and the1 nutrients to the lake eraircnnierit. Thus. ituicLion? of the the consumors. and the decora- are Kicrrpkted. The removal of all vegeta- tion to produce a plant free lake would seriously ihe cnlire aquatic rv's- To a ?ailbcat a pl.Tt free lake would mean hcurs of sailing, but :o a fisherman it would mean no fish. Thus, to satisfy the maioriry of the pubbc a lake- improvement program must control excessive plant but not eliminate the plants needed to produce oxygen and fcod. fheller fish and aruatic lifo. and stabilize the nutrient level. VTe have found ihat where rcoted aquatic plasu lo-lally removed from a Inke. phosphonis levels doubl- ed. This, in turn, stimulated i.he production of algal scums. Tne Ciiy of parks rippanmew and Lbe LetJibridse Eeser_-ch Etstiorj have beta Morking for ttK last five yesrs on 2 prevram to Lniprove Hen- ccvson Lr.ke. h.-ve been r.iade of nu- trier.: levels, tempera- tures, secsonal oxygen levels, ET-.d the eroTrth rates of aqua- tic plants. Tne responses ri plants and Ihe late As- tern to aquatic herbicides have been, determined. We Style 73' RECREATION VEHICLE SHOW Is Coming To The LETHBRIDGE EXHIBITION PAVILION Thursday, Friday and Saturday Feb. 8, 9, 10 SEE WHAT'S NEW IN PRAVEL COMFORT See on display the Terry, Prowler, Tauras and Intruder Trailers Vanguard Campers and Fifth Wheels Introducing the MOTOR HOMES L DORADO 2910 1st Ave. S. East of Govt. Elevators OTOIS ANNUAL KINSMEN SPORTSMAN'S DINNER John Ferguson Jimmy Piersall Joe Rudi SAT., FEB. 3, LETHBRIDGE EXHIBITION PAVILION TICKETS AVAILABLE FROM MARCEL'S SMOKE SHOP, CLUB CIGA9 OR ANY KINSMEN MEMBER CASINO TO FOLLOW DINNER ;