Download Ecological Methods: With Particular Reference to the Study by T. R. E. Southwood D.SC., PH.D., F.R.S. (auth.) PDF

Download Ecological Methods: With Particular Reference to the Study by T. R. E. Southwood D.SC., PH.D., F.R.S. (auth.) PDF

By T. R. E. Southwood D.SC., PH.D., F.R.S. (auth.)

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A field, is often referred to as nested sampling, and may be on two, three or more levels (Bancroft & Brindley, 1958). 6) Sampling Programme 19 If the interplant variance (sl) is the major source of variance and unless the cost of moving from plant to plant is very high n will be in the order of one or less (which means one in practice). Interplant variance has been found to be much greater than within-plant variance for the spruce sawfly (Diprion hercyniae) (Prebble, 1943), the lodgepole needle miner (Recurvaria starki) (Stark, 1952b), the cabbage aphid (Brevicoryne brassicae) (Church & Strickland, 1954), the spruce budworm (Choristoneura fumiferana) (Morris, 1955), the winter moth (Operophtera brumata) (Morris & Reeks, 1954), the diamondback moth (Plutella maculipennis) (Harcourt, 1961a), the cabbage butterfly (Pieris rapae) (Harcourt, 1962), the Western pine beetle (Dendroctonus brevicomis) (Dudley, 1971), the pine chermid (Pineus pinifoliae,) (Ford & Dimond, 1973) and the spider mite (Panonychus u/mi,) (Herbert & Butler, 1973).

1958). Some insects are distributed without bias on either side of the mid vein ofleaves, so that they may be conveniently subsampled, and Nelson, Slen & Banky (1957) record that when estimating populations of sheep keds, the fleece of only one side need be sampled. g. a field, is often referred to as nested sampling, and may be on two, three or more levels (Bancroft & Brindley, 1958). 6) Sampling Programme 19 If the interplant variance (sl) is the major source of variance and unless the cost of moving from plant to plant is very high n will be in the order of one or less (which means one in practice).

1954, Studies on the biology and population dynamics of British grasshoppers, Anti-Locust Bull. 17, 1-182. STRICKLAND, A. , 1961. Sampling crop pests and their hosts. A, Rev. Ent. 6, 201-20. VARLEY, G. c. and GRADWELL, G. , 1963. The interpretation of insect population changes. Proc. Ceylon Assoc. Adv. Sci. 18 (D), 142-56. FURTHER BIBLIOGRAPHY ALLEN, S. , GRIMSHAW. H. M, PARKINSON, 1. A. , Oxford. CANCELA DA FONSECA, 1. P, 1965-9. L'outil statistique en Biologie du sol. Revue Ecol. BioI. Sol.

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