Science. 1980 Feb 29;207(4434):999-1001. doi: 10.1126/science.207.4434.999.
Amargosa pupfish from a constant-temperature spring have a narrower range of temperature and oxygen tolerances than pupfish from the much more variable Amargosa River, indicating that the two populations have diverged genetically since their isolation. The reduced tolerances of the fish inhabiting a constant environment support the predictions of evolution theory.
来自恒温泉的沙漠帕氏鱼比来自变化多端的阿马戈萨河的沙漠帕氏鱼有更窄的温度和氧气耐受范围，这表明这两个种群自隔离以来已经在基因上发生了分歧。生活在恒常环境中的鱼类的耐受能力降低，支持了进化理论的预测。
