POPULATION DYNAMICS AND EXPLOITATION OF SEALS 183 



ACKNOWLEDGEMENTS 



Without the aid of many people and organizations the field work on which 

 this report is based would have been impossible. I am especially indebted to 

 Drs D. V. EUis, E. H. Grainger and A. W. Mansfield for their large contribu- 

 tions of observations and material. Professor G. E. Hutchinson, Dr D. E. 

 Sergeant, and Dr W. E. Ricker have all read the draft of this paper, to its 

 improvement. 



REFERENCES 



Andrewartha, H. G. & Birch, L. C. (1954). The distribution and abundance of animals. Univ. 



Chicago Press, 782 pp. 

 Laws, R. M. (1953). A new method of age determination for mammals with special reference 



to the elephant seal {Mirounga leonina Linn.). Falkland Islands Dependencies Survey Set., 



Rep. 2, iipp. 

 McLaren, I. A. (1958a). Some aspects of growth and reproduction of the bearded seal, Erignathus 



harbatus (Erxleben). J. Fish. Res. Bd Canad., 15, 219-27. 

 McLaren, I. A. (1958^). The biology of the ringed seal (Phoca hispida Schreber) in the eastern 



Canadian Arctic. Bull. Fish. Res. Bd Canad., 18., 97 pp. 

 McLaren, L A. (1958c). The economics of seals in the eastern Canadian Arctic. Fish. Res. Bd 



Canada, Arctic Unit Circular, i, 94 pp. (mimeo). 

 McLaren, L A. (in press). Methods of determining the numbers and availabiHty of ringed seals 



in the eastern Canadian Arctic. Arctic. 

 Plekhanov, p. (1933). [Determination of ages of seals.] Sovetskii Sever, 4, 11 1-4. 

 Sergeant, D. E. (1959). Studies on the sustainable catch of harp seals in the western North 



Atlantic. Fish. Res. Bd Canada, Arctic Unit Circular, 4, 38 pp. (mimeo). 

 SuRKOV, S. S. (1957). [Distribution and stocks of harp seals in the White Sea.] PINRO, Murmansk, 



60 pp. 



