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Two profs to study why . bull-frog numbers declining Weedy, mosquito-infested _swamps might not be your "idea of pleasant surround- ings, but for the bullfrog it is home. Dr. E.J. Crossman and Jim Lovisek, of the Royal Ontario Museum's Department of Ichthyology and Herpetology, are con- cerned that the increasing rarity of these weed-choked ponds and backwaters is contributing to the downfall of this familiar amphibian. To pull the bullfrog popula- tion out of this potentially fatal decline, Dr. Crossman and Jim Lovisek are collab- orating with the Ontario Min- istry of Natural Resources in a thorough study of the biol- ogy of the bullfrog to clarify some of the dangers threat- ening the species. It has been apparent for several years that bullfrog populations in the Kawartha Lakes district were declin- ing. Recent work has revealed that, from tadpole to aging adult, this amphib- ian's life is fraught with hazards. Our control of water levels and land use severely threatens Ontario's bullfrogs. As tadpoles they depend on shallow temporary ponds, where spring temperatures are high enough to support abundant supplies of the food they devour. Unfortunately, it is possible that these small ponds are filled by the notor- ious acid rain that plagues certain northern Ontario ecosystems. Even if the tadpoles survive this inhos- pitable early environment, they must find a winter shelter which is safe from frost. Normally, their habit of burrowing into the mud on the pond bottom ensures a secure shelter. However, flood prevention programs often call for the lowering of watersheds in the autumn, after the tadpoles and adults have chosen supposedly safe Durham jobless figures The number of clients unemployed and registered for work at the Canada Employment Centres in Ajax, Whitby, and Oshawa, for the month of June totalled 14,992, consisting of 7,811 female and 7,181 male clients. This figure includes 5,171 students. Placements in the three offices totalled 1,671 for the month, which compares to a total of 1,627 placements during May. The majority of clients were registered in Material-Handling and Related; Construction Trades; Product Fabrica- ting, Assembling and Re- pairing; Service; Sales; and Clerical and related. In June, there were 47 agreements signed under the Canada Manpower Indus- trial Training Program. As a result, 80 people will benefit from both training and employment in the Region of Durham. At the end of June, there were 141 students in the skill courses sponsored by the Canada Employment Centre and 35 people receiving academic upgrading at Durham College. places to burrow into the mud bottom for the winter. Ant when the freshly expos- ed mud is frozen solid in the winter, the tadpoles and adults buried in it cannot survive. Further tribulations await those bullfrogs that reach adulthood. In the early spring the frogs leave their mud burrows and head for the local swamp -- probably their own birth place. If the area has not been drained to kill mosquitos, filled with sand to create a beach, or excavated to provide a deep water dock, the bullfrogs can begir the serious business of repreuction. The males establish well defir :d territories where they produce their atonal symphony of croaks. The female frogs, attracted by this * izarre music, enter the mating area, and later pro- duce large egg masses. But last spring something went wrong. At the Royal Ontario Museum's study area in the Kawarthas, Dr. Crossman and Jim Lovisek heard the bulirog chorus in June and July, but they searched in vain for mating pairs and the fertilized egg masses. Per- haps the female. ariived too early or too late to hear the males' calls. This summer the Royal Ontario Museum: biologists will try to discover why the female frogs missed their date with the males last year. Dr. Crossman and Jim Lovisek hope that the results of their work in collaboration with the Ministiy of Natural Resources wii eventually provide sound biological in- formation which will make it possible for the bullfrogs to maintain their numbers in the face of the many environ- mental pressures. VT 0 milion PORT PERRY STAR -- Wednesday, . August 1, 1979 -- 9 gro SAO "DO- NO's 17 Record - Craft - Hobby World PORT PERRY PLAZA We're New "BUT" We're Determined to be the "BEST" For all your Craft, Record or Hobby N=eds - See Us First! If we don't have what you need, We'll get it for you FAST! 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