By Bernard Stonehouse

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Example text

The long decline uf our rabbits following peak density resembled that 'most puzzling feature' of cyclic microtines. Lack (1954b) suggested that the delayed recovery of the vegetation might explain the long decline; but the decline of the rabbits continued long after the vegetation recovered. A long decline is to be expected, however, in prey populations subjected to a buildup of predators that lags behind and eventually overshoots them. The rabbits' decline from predation by cats and ferrets recalls that of Pearson's voles (1964; 1966; 1971) eaten by house cats in California.

They are very different animals ecologically. Hares browse shrubs and tall herbaceous vegetation as well as the short pasture favoured by rabbits. The food supply of hares is rather predictable for most of the year and may reason· ably be measured by the standing crop of vegetation, whereas that of rabbits is uncertain even from week to week and is better measured by the growth rate of the vegetation. Correspondingly, the rabbit is an opportunist breeder while the hare keeps rigidly to a. set breeding season (Flux, 1965).

C. and Myers, J. H. (1974). Population cycles in small mammals. Adv. Ecol. , 8, 267-399. Lack, D. (1954a). The Natural Regulation of Animal Numbers. Clarendon Press, Oxford. Lack, D. (1954b). ]. Wild/. , 18 25-37. Lack, D. (1966). Population Studies of Birds. Clarendon Press, Oxford. Lack, D. (1969). Population changes in the land birds of a small island. J. Anim. , 38,211-218. Leslie, P. H. and Ranson, R. M. (1940). The mortality, fertility and rate of natural increase of the vole (Microtus agrestis) as observed in the laboratory.

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