کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
4387097 1304589 2007 9 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Relationship between reservoir size and genetic differentiation of the stream caddisfly Stenopsyche marmorata
موضوعات مرتبط
علوم زیستی و بیوفناوری علوم کشاورزی و بیولوژیک بوم شناسی، تکامل، رفتار و سامانه شناسی
پیش نمایش صفحه اول مقاله
Relationship between reservoir size and genetic differentiation of the stream caddisfly Stenopsyche marmorata
چکیده انگلیسی
Reservoirs have the potential to block the gene flow of stream macroinvertebrates along a channel, which takes place via larval drift and adult flight, resulting in genetic differentiation above and below the reservoirs. Gene flow across the reservoirs may be strongly obstructed if the area of standing water is larger. Using random amplified polymorphic DNA markers, we investigated the genetic structure of Stenopsyche marmorata (Stenopsychidae: Trichoptera) populations found above and below the reservoirs, and the reference stream of six reservoirs with small to large water surface area ranging from 0.12 km2 to 6.00 km2. As a result, the two largest reservoirs with a standing water area larger than 3.27 km2 showed significant differences in pairwise θ between fragmented and reference streams, whereas the other four reservoirs with a standing water area smaller than 1.64 km2 showed insignificant differences. The genetic differentiations in the two largest reservoirs did not result in the reduction of genetic diversities in the fragments. Based on the significant correlation between relative population size and mean expected heterozygosity, we concluded that local genetic diversities were constrained in smaller populations due to the effect of genetic drift.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Biological Conservation - Volume 136, Issue 2, April 2007, Pages 203-211
نویسندگان
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