Juvenile salmonid distribution, growth, condition, origin, and environmental and species associations in the Northern California Current
Juvenile salmonid distribution, growth, condition, origin, and environmental and species associations in the Northern California Current
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北加州海流幼鱼的分布、生长、状况、起源以及环境和物种关联
DOI：
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发表时间：
2004
期刊：
影响因子：
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通讯作者：
T. Miller
中科院分区：
文献类型：
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作者：
R. Brodeur;J. Fisher;D. Teel;R. Emmett;E. Casillas;T. Miller
总结了有关鲑鱼幼鱼分布、大小、状况、生长、种群来源和
2000 年 6 月和 8 月 GLOBEC 航行中的物种和环境协会，特别强调与俄勒冈州南部附近布兰科角北部和南部地区有关的差异。与六月航行相比，八月航行期间的幼鲑鱼数量更加丰富，并且
主要分布于布兰科角以北。之间的分布模式存在明显差异
鲑鱼种类：奇努克鲑鱼在沿海较冷的水域附近发现，而银鲑鱼则在
在布兰科角以南很少发现。离岸距离和温度是与银鲑鱼和奇努克鲑鱼分布相关的主要解释变量。游轮之间的游生物组合存在显着差异。六月的巡游以石斑鱼幼鱼、霸王鳎鱼和黑貂鱼为主，而八月几乎完全没有这些鱼。六月份的饵料鱼群落包括布兰科角以北的太平洋鲱鱼和胡胡鱼，以及布兰科角以南的胡胡瓜鱼。八月的鱼类群落以太平洋沙丁鱼和高度洄游的中上层物种为主。 GLOBEC 研究区域中银大麻哈鱼幼鱼的估计生长率高于更北地区。研究区域的银鲑鱼中早熟雄性的比例异常高。银大麻哈鱼幼鱼生长和状况的显着差异表明布兰科角北部和南部的海洋环境不同。北部的幼年银鲑鱼的状况指数较高，但一岁大奇努克鲑鱼的状况指数没有显着差异。遗传混合种群分析表明，6 月份，我们样本中的大部分奇努克鲑鱼起源于俄勒冈州中部海岸沿线的河流。八月，在布兰科角以南采集的奇努克鲑鱼大部分来自俄勒冈州南部和加利福尼亚州北部；而布兰科角以北的大多数奇努克鲑鱼来自加利福尼亚州的中央山谷。
Information is summarized on juvenile salmonid distribution, size, condition, growth, stock origin, and
species and environmental associations from June and August 2000 GLOBEC cruises with particular emphasis on differences related to the regions north and south of Cape Blanco off Southern Oregon. Juvenile salmon were more abundant during the August cruise as compared to the June cruise and were
mainly distributed northward from Cape Blanco. There were distinct differences in distribution patterns between
salmon species: chinook salmon were found close inshore in cooler water all along the coast and coho salmon were
rarely found south of Cape Blanco. Distance offshore and temperature were the dominant explanatory variables related to coho and chinook salmon distribution. The nekton assemblages differed significantly between cruises. The June cruise was dominated by juvenile rockfishes, rex sole, and sablefish, which were almost completely absent in August. The forage fish community during June comprised Pacific herring and whitebait smelt north of Cape Blanco and surf smelt south of Cape Blanco. The fish community in August was dominated by Pacific sardines and highly migratory pelagic species. Estimated growth rates of juvenile coho salmon were higher in the GLOBEC study area than in areas farther north. An unusually high percentage of coho salmon in the study area were precocious males. Significant differences in growth and condition of juvenile coho salmon indicated different oceanographic environments north and south of Cape Blanco. The condition index was higher in juvenile coho salmon to the north but no significant differences were found for yearling chinook salmon. Genetic mixed stock analysis indicated that during June, most of the Chinook salmon in our sample originated from rivers along the central coast of Oregon. In August, chinook salmon sampled south of Cape Blanco were largely from southern Oregon and northern California; whereas most chinook salmon north of Cape Blanco were from the Central Valley in California.