Campbell Matthew A, Habibi Ensieh, Auringer Grace, Stephens Molly, Rodzen Jeff, Conway Kevin W, Finger Amanda J
Genomic Variation Laboratory, 2403 Meyer Hall, Department of Animal Science, University of California, Davis, 1 Shields Avenue, Davis, CA 95616. Phone: 530-752-6351.
2Natural Reserve System, University of California Merced, Merced, CA 95343.
Zootaxa. 2023 Mar 9;5254(1):1-29. doi: 10.11646/zootaxa.5254.1.1.
Rainbow Trout, Oncorhynchus mykiss, exhibit high levels of phenotypic diversity leading to the recognition of numerous subspecies. A major distinction among Rainbow Trout subspecies exists between Coastal Rainbow Trout (O. m. irideus), which occurs west of the Cascade and Sierra Nevada mountain ranges, and interior Redband Trout (O. mykiss sspp.), largely distributed to the east. Interior Redband Trout are composed of three primary lineages and can share various outward, anatomical or physiological characteristics that are often symplesiomorphies or examples of convergence. We examine high-throughput DNA sequence data from Sacramento Redband Trout O. m. stonei from the Upper Pit and Upper McCloud Rivers along with representatives of Rainbow Trout and Golden Trout lineages to clarify the composition and relationships of the Sacramento Redband Trout. We find O. m. stonei to be polyphyletic, divided between populations in the Pit River and the Upper McCloud River. Redband Trout obtained from the Pit River are most-closely related to Great Basin Redband Trout O. m. newberrii and to fish of the Warner Lakes Basin and Surprise Valley within the O. m. newberrii lineage. The type specimen of O. m. stonei, collected from the Lower McCloud River, is phenotypically similar to Great Basin Redband Trout. We find as well that the isolated populations of trout in the Upper McCloud River Basin represent a lineage of Rainbow Trout now restricted to that region, are monophyletic and are not most closely related to the interior Redband Trout lineages of O. m. newberrii or O. m. gairdnerii. Furthermore, they are not represented by the type specimens of O. m. stonei or O. m. shasta. Consequently, we formally describe the McCloud River Redband Trout O. mykiss calisulat, new subspecies.
虹鳟（Oncorhynchus mykiss）表现出高度的表型多样性，从而产生了众多亚种。虹鳟亚种之间的一个主要区别存在于沿海虹鳟（O. m. irideus）和内陆红带鳟（O. mykiss sspp.）之间，沿海虹鳟分布在喀斯喀特山脉和内华达山脉以西，而内陆红带鳟主要分布在东部。内陆红带鳟由三个主要谱系组成，可能具有各种外部、解剖学或生理学特征，这些特征通常是同祖特征或趋同的例子。我们研究了来自上皮特河和上麦克劳德河的萨克拉门托红带鳟（O. m. stonei）以及虹鳟和金鳟谱系代表的高通量DNA序列数据，以阐明萨克拉门托红带鳟的组成和关系。我们发现O. m. stonei是多系的，分为皮特河和上麦克劳德河的种群。从皮特河获得的红带鳟与大盆地红带鳟（O. m. newberrii）以及O. m. newberrii谱系中的华纳湖盆地和惊喜谷的鱼类关系最为密切。从下麦克劳德河采集的O. m. stonei的模式标本在表型上与大盆地红带鳟相似。我们还发现，上麦克劳德河流域孤立的鳟鱼种群代表了一个现在仅限于该地区的虹鳟谱系，是单系的，与O. m. newberrii或O. m. gairdnerii的内陆红带鳟谱系关系并不最为密切。此外，它们没有被O. m. stonei或O. m. shasta的模式标本所代表。因此，我们正式描述了麦克劳德河红带鳟（O. mykiss calisulat），新亚种。
