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VERY HIGH POPULATION ESTIMATES AND LIMITED MOVEMENT OF SNAIL-KILLING FLIES (DIPTERA: SCIOMYZIDAE) ON AN IRISH TURLOUGH (TEMPORARY LAKE)

Christopher D. Williams, Michael J. Gormally and Lloyd V. Knutson
Biology and Environment: Proceedings of the Royal Irish Academy
Vol. 110B, No. 2 (September 2010), pp. 81-94
Published by: Royal Irish Academy
Stable URL: http://www.jstor.org/stable/20799779
Page Count: 14
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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.
VERY HIGH POPULATION ESTIMATES AND LIMITED MOVEMENT OF SNAIL-KILLING FLIES (DIPTERA: SCIOMYZIDAE) ON AN IRISH TURLOUGH (TEMPORARY LAKE)
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Abstract

Sciomyzid flies (Diptera) have potential as biological control agents of intermediate hosts of snail-borne trematode diseases and as bioindicators of habitat condition and quality (particularly hydrology and vegetation structure). Standard area sweep net sampling of these flies in a single vegetation zone across ten turloughs in summer 2004 highlighted the importance of vegetation structure (standing height and outstretched length) on the abundance and species richness of Sciomyzidae. A mark-recapture study was initiated in the summer of 2005 with the aim of quantifying absolute populations at one site where sciomyzid abundance was particularly high (Cregaclare South, Co. Galway). The total abundance of Sciomyzidae at the site was estimated at 3512 flies over an area of 600 square metres. This density (6.08 flies per square metre) is considerable higher than densities previously reported in two studies of a sciomyzid species in the USA, but is in line with estimates from the 2004 wider study. Specific markings were used in the 2005 mark-recapture study to monitor any adult fly movements within the habitat. Females in two out of the three univoltine species showed a positive correlation in the proportion of gravid individuals caught over time. Multivoltine species showed no such relationship. Additionally, multivariate procedures were used to investigate the effect of date of sampling and spatial position on sciomyzid assemblage composition.

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