Genetic Variation of the Viviparid Snail, Sinotaia Quadrata (Gastropod: Viviparidae), in Taiwan

台灣產石田螺(Sinotaia Quadrata; Gastropod: Viviparidae)的遺傳變異

邱郁文(Yuh-Wen Chiu) ； 陳昭倫(Chaolun Allen Chen) ； 陳弘成(Hon-Cheng Chen)

《Acta Zoologica Taiwanica》 13卷1期 (2002/01) Pp. 1-10

https://doi.org/10.6576/AZT.2002.13.(1).1

摘要

本文以同功?水平電泳對台灣地區石田螺進行遺傳變異及親緣地理學的研究。17個基因座中共偵測到五個多型性的基因座，並且普遍有異型結合子缺乏的情形。雖然，六個族群間的傳距離相當低（平均值0.0061），但是，由遺傳距離所建構的UPGMA圖所可以分為兩大群，北部群及南部－東部群。族群間表現了相當低的固定指數（fixation index）（平均Fst = 0.056）及高的有效遷移族群（平均Nm = 6.5846），證明族群間有高度的基因交流。然而，遺傳距離與地理距離並無顯著相關（r2 = 0.0636, p =0.364），這個族群間的高相似度可能是由於近代人為養殖活動的攜帶抵消了地理事件成遺傳結構所致。

關鍵字

田螺 ； 石田螺 ； 同功酶 ； 遺傳變異 ； 親緣地理學

並列摘要

Allozyme electrophoresis was used to assess the genetic variation and population structure of a Taiwanese viviparid snail, Sinotaia quadrata. Five of 17 loci were polymorphic, but a deficiency of heterzygotes for all loci was observed. Values for Nei's genetic distances among the SIX populations were small, with a mean value of 0.0061. The phenogram constructed using the UPGMA method revealed that the six groups of viviparids could be clustered into northern and southern-eastern groups. The fixation index (Fst) was low (mean = 0.056), and the effective number of migrants was high (Nm = 6.5846). However, no correlation between genetic distance and geographical distance was detected (r2 = 0.0636, p = 0.364). Gene now probably due to aquaculture activities has resulted in high genetic similarity among populations of S. quadrata.

並列關鍵字

Viviparid ； Sinotaia quadrata ； Allozyme ； Genetic variation ； Phylogeography