Stockwell Craig A, Mulvey Margaret
Department of Zoology, Stevens Hall, North Dakota State University, Fargo, North Dakota, 58105-5517.
Savannah River Ecology Laboratory, Drawer E, Aiken, South Carolina, 29802.
Evolution. 1998 Dec;52(6):1856-1860. doi: 10.1111/j.1558-5646.1998.tb02264.x.
The phosphogluconate dehydrogenase (Pgdh) locus is the only polymorphic allozyme locus observed among 37 loci examined in all four populations of a New Mexico state Endangered species, the White Sands pupfish (Cyprinodon tularosa). We report evidence suggesting that this polymorphism may be associated with salinity. Salinity levels vary widely within and between habitats occupied by White Sands pupfish. The frequency of the Pgdh allozyme was correlated with salinity but not with temperature. Frequency of Pgdh differed between low (3.76 parts per thousand (ppt)) and high (9.23 ppt) salinity sites at Malpais Spring despite no obvious barriers to fish movement. Frequencies of Pgdh in two introduced populations differed from that of the presumptive founding stock and correlated with salinity in the current habitats.
磷酸葡萄糖酸脱氢酶（Pgdh）基因座是在新墨西哥州濒危物种白沙鳉（Cyprinodon tularosa）的所有四个种群中检测的37个基因座里观察到的唯一多态性等位酶基因座。我们报告的证据表明，这种多态性可能与盐度有关。白沙鳉所占据的栖息地内部和之间的盐度水平差异很大。Pgdh等位酶的频率与盐度相关，但与温度无关。尽管鱼类移动没有明显障碍，但在马尔派斯泉低盐度（3.76‰）和高盐度（9.23‰）位点之间，Pgdh的频率有所不同。两个引入种群中Pgdh的频率与假定的奠基种群不同，并且与当前栖息地的盐度相关。
