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Estimates of Population Size and Longevity of Adult Narcissus Bulb Fly Merodon equestris Fab. (Diptera: syrphidae)

D. L. T. Conn
Journal of Applied Ecology
Vol. 13, No. 2 (Aug., 1976), pp. 429-434
DOI: 10.2307/2401792
Stable URL: http://www.jstor.org/stable/2401792
Page Count: 6
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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.
Estimates of Population Size and Longevity of Adult Narcissus Bulb Fly Merodon equestris Fab. (Diptera: syrphidae)
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Abstract

(1) Daily population estimates were made on adult Merodon equestris during 1968 to 1971 using Jolly's and Fisher-Ford's method. (2) The population trends estimated by the two methods generally coincided but Jolly's estimates fluctuated more widely. (3) Temperature accounted for 40% of the variation when predicting population size, the remainder being possibly due to sampling errors. (4) Sex ratio varies from approximately 1.8 females to one male to 1.4 males to each female. (5) Average longevity varies from about three days to twelve days.

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