Read e-book online Earthworms for Ecology and Profit: Earthworms and the PDF

By Sr. Ronald E. Gaddie, Donald E. Douglas

ISBN-10: 0916302008

ISBN-13: 9780916302009

Quantity One basically - Illustrated

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Extra resources for Earthworms for Ecology and Profit: Earthworms and the Ecology

Example text

G. and Birch, L C. (1954). 'The Distribution and Abundance of Animals: University of Chicago Press, Chicago, 782 pp. Bull, P. C. (1964). N. Z. Dep. Sci. industr. Res. Bull. 158; 147. Chitty, D. (1958). Self-regulation of numbers through changes in viability, in 'Population Studies: Animal Ecology and Demography'. Cold Spring Harb. Symp. quant. Bioi. 22; 277-280. Chitty, D. (1967). The natural selection of self-regulatory behaviour in animal populations. Proc. ecol. Soc. Aust. 2, 51 - 78. R. and Birch, L.

Three years later only 16 animals were left, of which at least 12 were males. It was one thing to demonstrate that predators ate many young and adult rabbits, but quite another to suggest that they so reduced the population that this prevented successful breeding in 1961, 1962 and most of 1963. We therefore removed the carnivores in late 1963, so as to compare the rabbits' survival without them with that of the preceding years. The results were spectacular. It was not until late October 1963 that the fence was heightened and electrified and the carnivores removed.

Huxley, J. (1934). Br. Birds, 27, 270-277. , Watson, A. and Miller, G. R. (I 963). ) in north-east Scotland. J. Anim. , 32, 317-376. , Watson, A. and Picozzi, N. (I 965). Red grouse chick survival in captivity and in the wild. Trans. Congr. int. Un. , 6, 63-70. Lack, D. (1954). The Natural Regulation of Animal Numbers. Clarendon Press, Oxford, 343 pp. Lack D. (I 966). Population Studies of Birds. Clarendon Press, Oxford, p. 341. Lack, D. (1969). Population changes in the land birds of a small island.

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Earthworms for Ecology and Profit: Earthworms and the Ecology by Sr. Ronald E. Gaddie, Donald E. Douglas


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