Despite the importance of straying in understanding the ecology of Pacific salmon Oncorhynchus spp. and steelhead O. mykiss, most of what is known about salmon and steelhead straying comes from tagged hatchery fish. We provide estimates of donor straying by natural‐origin spring, summer, and fall Chinook Salmon O. tshawytscha and summer steelhead at three spatial scales in the upper Columbia River watershed by using PIT tags. In total, 823,770 natural‐origin Chinook Salmon and steelhead were PIT‐tagged as juveniles in the Wenatchee, Entiat, Methow, and Okanogan River subbasins and tributaries and the upper Columbia River between 2002 and 2017. Anadromous adults with PIT tags (n = 2,611) were detected at a variety of antenna arrays in the Columbia River basin between 2004 and 2018. Mean donor stray rates of each population were less than 1% at the basin scale (range = 0.0–0.7%), less than 10% at the subbasin scale (range = 0.0–9.8%), and less than 15% at the tributary scale (range = 0.0–14.3%). Many of the populations (11 of 28) that were evaluated across all spatial scales did not have any strays detected, and the mean of means for both species’ stray rates at all spatial scales was generally less than 5% (range = 0.2–4.0%). Chinook Salmon and steelhead strayed at similar rates when originating from the same subbasins and tributaries. Most straying occurred in an upstream direction at the subbasin (84%) and tributary (94%) scales. Variation in stray rates was most consistently associated with spatial scale and location and was less than 15% for both species at all spatial scales.

中文翻译：

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哥伦比亚河上游流域的天然起源的奇努克鲑鱼和硬皮鱼流浪率

尽管努力了解太平洋鲑鱼Oncorhynchus spp的生态非常重要。和steel鱼（O. mykiss），关于鲑鱼和steel鱼流浪的大多数信息都来自带有标签的孵化场鱼。我们使用PIT标签在哥伦比亚河上游流域的三个空间尺度上估算了自然起源的春季，夏季和秋季的奇努克鲑鱼O.tshawytscha和夏季硬头动物的捐助者流失情况。总之，823770天然来源的大马哈鱼和虹鳟是PIT标记作为韦纳奇，恩蒂亚特，Methow和奥卡诺根河子流域支流和2002年和2017年与PIT标记溯河产卵的成年人之间的上部哥伦比亚河的少年（ñ  = 在2004年至2018年期间，在哥伦比亚河盆地的各种天线阵列上检测到了2611个。在盆地规模（范围= 0.0–0.7％）下，每个人群的平均施主流浪率均小于1％，而在流域尺度上，均小于10％子流域规模（范围= 0.0–9.8％），而支流规模小于15％（范围= 0.0–14.3％）。在所有空间范围内进行评估的许多种群（28个中的11个）没有检测到任何杂散，并且两个物种在所有空间范围内的杂散率的平均值均值通常小于5％（范围= 0.2-4.0） ％）。当来自同一子盆地和支流时，奇努克鲑鱼和硬头鲨以相似的速度偏离。大部分流浪发生在上游（子流域（84％）和支流（94％））。