Because of mineral mining threats in the headwaters that drain into Lake Clark National Park, we implemented a baseline ecological survey of the Chulitna River basin through the use of a probability study design. A total of 49 wadeable stream and raftable river sites were sampled for fish assemblages, multiple physical habitat structure variables, and multimeter chemistry (dissolved oxygen, conductivity, pH, and water temperature) by the using standard methods that are employed in the United States Environmental Protection Agency's (USEPA) National Rivers and Streams Assessment. We recorded moderate levels of canopy density, low levels of riparian woody vegetation cover, and the absence of large wood in the Chulitna River basin streams. The extremely low levels of channel incision, the absence of riparian anthropogenic disturbance, and high levels of water quality indicate insignificant anthropogenic landscape alteration in these streams and rivers. Fish were not observed at seven sites, representing 27% of the calculated 2,220 km of the target stream length in the study population. Arctic Grayling Thymallus arcticus, Dolly Varden Salvelinus malma, and Northern Pike Esox lucius were present in 10% (227 km), 38% (847 km), and 8% (181 km) of the calculated target stream/river length, respectively. The most commonly occurring and abundant species, Slimy Sculpin Cottus cognatus (now Uranidea cognata), was present in 56% (1,244 km) of the calculated stream/river length. The lack of anadromous salmon detections was associated with salmonid life histories, naturally high levels of substrate fines and embeddedness, and the presence of Northern Pike. The quality of physical habitat and water quality, as well as the occurrences of Arctic Grayling and Dolly Varden, are representative of the unimpaired waters in Alaska, compared with those in the conterminous USA. We concluded that statistically and ecologically rigorous stream and river sampling can be implemented across a roadless region at reasonable cost and with sufficient planning.

中文翻译：

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阿拉斯加克拉克湖国家公园和自然保护区丘利特纳河流域的完整渔业清单：一个受最小扰动的流域的例子

由于排入克拉克湖国家公园的上游水源中的矿产开采威胁，我们通过概率研究设计对楚利塔纳河流域进行了基线生态调查。通过使用美国环境署采用的标准方法，对总共49个可涉河和漂流河站点进行了采样，以用于鱼类组合，多种物理生境结构变量和万用表化学（溶解氧，电导率，pH和水温）保护局（USEPA）的国家河流与溪流评估。我们记录了中等水平的冠层密度，低水平的河岸木质植被覆盖度和丘利特纳河流域河流中没有大片木材的情况。通道切口的水平极低，无河岸人为干扰，高水质表明这些溪流和河流中人为的景观变化不明显。在七个地点未观察到鱼类，占研究种群目标河段长度2220公里的27％。北极河鳟在计算出的目标河流/河流长度的10％（227 km），38％（847 km）和8％（181 km）中分别存在Thymallus arcticus，Dolly Varden Salvelinus malma和Northern Pike Esox lucius。最常见和丰富的物种，史莱姆Sculpin Cottus cognatus（现为Uranidea cognata））占计算出的河流/河道长度的56％（1,244 km）。缺乏鲑鱼检出率与鲑鱼的生活史，自然高水平的底物细度和包埋性以及北派克鱼的存在有关。与美国本土相比，阿拉斯加未受损害的水域代表了自然栖息地和水质的质量，以及北极河鳟和多莉·瓦尔登的出现。我们得出的结论是，可以在合理的成本和充分的规划下，在无路区域上进行统计和生态学上严格的河流和河流采样。