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Differences Between the Invertebrate Faunas of Grazed and Ungrazed Chalk Grassland. IV. Abundance and Diversity of Homoptera-Auchenorhyncha

M. G. Morris
Journal of Applied Ecology
Vol. 8, No. 1 (Apr., 1971), pp. 37-52
DOI: 10.2307/2402126
Stable URL: http://www.jstor.org/stable/2402126
Page Count: 16
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Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
Differences Between the Invertebrate Faunas of Grazed and Ungrazed Chalk Grassland. IV. Abundance and Diversity of Homoptera-Auchenorhyncha
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Abstract

(1) Samples of the Auchenorhyncha of ungrazed exclosures and grazed control plots at the Barton Hills, Bedfordshire, were taken in summer 1967 and April 1968 to March 1969. (2) Forty-five species were recorded, of which fifteen were in small numbers, six showed no consistent pattern of occurrence related to management, two occurred more frequently on the grazed grassland and twenty-two were more numerous in the exclosures. Larvae were taken in greater numbers in the ungrazed grassland. (3) Marked increases in numbers in the exclosures from 1967 to 1968 were recorded for several species. (4) The relevance of measurements of diversity to conservation is discussed and the mean diversity of the leafhopper samples from the grazed and ungrazed plots compared. In both cases diversity increases during the summer to reach a maximum in late summer or early autumn. Mean diversity in the exclosures is greater than that on the grazed land at all times of the year. (5) The samples are compared with similar ones taken by Whittaker (1969) at Wytham, Berkshire, in relation to diversity and habitat preferences of the species. (6) The relevance of the results to the management of grassland for conservation is discussed. Some features of the measurement of diversity and its use in management research are considered.

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