'riiiKTV-SKViox'iii i:ii;N.\iAh Ki;i'()K'r 



31 



Several pluises of the i)i'()bl(Mii will he iii\('sti<i:ate(l. Extensive sur- 

 veys will be cai'i'ied out to (let(M'Hiiu(! what ])arasites occur, how wide- 

 spread are certain diseases and what other animals may be affected or may 

 serve as carriers. Ki-om such information, ])Ius Jaboi-itory experiments 

 on life histories and pat]ioIo<iy, il is hoped that we sh;ill be able to evalu- 

 ate the importance of diseases and the nalure of damage to wild animal 

 ]iopulations. Once such information has been obtaiiu'd control measures 

 will be attempted. One of the important still unanswered questions in 

 wildlife is the fluctuation of populations know'u as cych's. The first 

 known project on this subject was the British Grouse investigation on 

 which a rei)ort was ])ublished in li)l 1 . Similar surveys have been cai-ried 

 out in other parts of the world as well as in this Country since that time. 

 At the Matamek Conference on Biolooical Cycles (1982) a <ii-eat deal 

 of importance was placed on the disease factor. Although much inves- 

 tigation has been made, particularly on rabbits and game birds, the 

 reasons for the periodicity, with cyclic diseases as a possible factor, are 

 still obscure and much more extensive work is indicated. Often the 



r*^ 



MAP or 

 CALIFORNIA 



DCP*BrvEWT Of NATURAL BfSOUOCCS 



D'Vis'On Of rrSH 1 camC 

 I STATe or CA| <rotiun 



J'^ Ur 



Fig. 7 



