美国西部河流创纪录高温，钓鱼禁令日趋频繁

创纪录的高温正在改变美国西部的河流生态。在水温升至对鱼类致命水平的驱动下，野生动物部门正在大范围实施钓鱼禁令和限制措施。1科罗拉多州今夏对19条河流共635.5英里（1023公里）实施了前所未有的限制措施，1蒙大拿州已将下午钓鱼限制范围扩至1200英里河流，1黄石公园也扩大了下午钓鱼限制至整个公园范围。1

这种禁令变得越来越常见。黄石公园在过去六年中有五年因高水温限制钓鱼，1蒙大拿州渔业部门生物学家Adam Strainer表示这些禁令"在过去十多年里变得非常普遍"。1气候变化正在改变山区积雪的规模和时间，导致河流热浪现象日益频繁。1

Record-breaking temperatures across the American West are forcing wildlife agencies to implement unprecedented fishing restrictions as rivers reach dangerously high temperatures for aquatic life. Colorado has imposed limitations on 635.5 miles across 19 rivers this summer in what officials describe as an unprecedented measure 1. Yellowstone National Park expanded its afternoon fishing restrictions to the entire park on Wednesday 1, while Montana extended similar afternoon closures to 1,200 miles of rivers the same day 1.

These restrictions reflect a growing pattern rather than isolated incidents. Yellowstone has limited fishing due to high water temperatures in five of the past six years 1. According to Adam Strainer, a biologist with Montana's Fish and Wildlife Parks Department, such fishing bans have "become very commonplace over the past more than a decade" 1. Research by Penn State professor Li Li indicates that "river heat waves" are becoming increasingly frequent in snow-covered regions, driven by climate change's effects on mountain snowpack scale and timing 1.