Exploring patterns of population subdivision in hte net-winged midge, Elporia barnardi (Diptera: Blephariceridae), in mountain streams of the south-western Cape, South Africa.

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Title Exploring patterns of population subdivision in hte net-winged midge, Elporia barnardi (Diptera: Blephariceridae), in mountain streams of the south-western Cape, South Africa.
Author Wishart, Marcus; Hughes, Jane
Journal Name Freshwater Biology
Editor Alan hildrew
Year Published 2001
Place of publication UK
Publisher Blackwell Science
Abstract 1. The net-winged midges (Diptera: Blephariceridae) are a highly specialized group whose morphological characteristics and specific habitat requirements suggest a limited potential for dispersal. Levels of genetic variation were examined within streams, between streams in the same range and between mountain ranges in larval populations of Elporia barnardi in the south-western Cape of South Africa. The aim was to examine the hypothesis that population structure would reflect the poor potential for dispersal. 2. Significant deviations from HardyWeinberg equilibrium in 17 of the 57 individual comparisons indicate a non-random mating population. Given the swarming behaviour and life history traits, larvae sampled may reflect the product of limited matings. 3. Analysis of population substructuring revealed significant levels of differentiation among geographically proximate populations. Large differences between streams within Table Mountain, similar in magnitude to those between mountain ranges, suggest that movement of individuals out of the stream catchment is rare. Observed FST values are more similar to those of fully aquatic species than other lotic insects with winged adult stages. 4. Results suggest that mountain ridges provided effective physical barriers to the dispersal of E. barnardi, with the catchment representing the effective population unit.
Peer Reviewed Yes
Published Yes
Publisher URI http://www.blackwell-synergy.com/doi/full/10.1046/j.1365-2427.2001.00691.x
Alternative URI http://www.blackwell-synergy.com/links/doi/10.1046%2Fj.1365-2427.2001.00691.x
Copyright Statement Copyright 2001 Blackwell Publishing. The definitive version is available at [www.blackwell-synergy.com.]
Volume 46
Page from 479
Page to 490
ISSN 0046-5070
Date Accessioned 2002-04-17
Date Available 2007-03-14T02:33:15Z
Language en_AU
Research Centre Australian Rivers Institute
Subject Freshwater Ecology
URI http://hdl.handle.net/10072/3708
Publication Type Journal Articles (Refereed Article)
Publication Type Code c1

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