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Juvenile Coho and Chinook Salmon Growth, Size, and Condition Linked To Watershed-Scale Salmon Spawner Abundance
Transactions of the American Fisheries Society ( IF 1.4 ) Pub Date : 2020-04-15 , DOI: 10.1002/tafs.10233
Philip J. Joy 1, 2 , Craig A. Stricker 3 , Renae Ivanoff 4 , Shiao Y. Wang 5 , Mark S. Wipfli 6 , Andrew C. Seitz 2 , Jiaqi Huang 7 , Mathew B. Tyers 1
Affiliation  

Anadromous Pacific salmon Oncorhynchus spp. are semelparous, and resource subsidies from spawning adult salmon (marine-derived nutrients [MDN]) benefit juvenile salmonids while they rear in freshwater. However, it is unclear if juvenile salmon populations respond predictably to the abundance of spawning salmon at the watershed scale. To address whether hypothesized benefits to rearing juveniles scale up to population and watershed scales, we examined juvenile Coho Salmon Oncorhynchus kisutch and Chinook Salmon O. tshawytscha growth, fork length, condition, and abundance as a function of MDN assimilation throughout the Unalakleet and North rivers in western Alaska. Additionally, a mark–recapture experiment provided abundance estimates of Coho Salmon smolts emigrating from these two rivers. Prior to spawning, residual MDN from past years offered little advantage to juvenile salmon. However, after the arrival of spawning adults, juveniles demonstrated a positive relationship between MDN and fish size, growth, and condition in fall and winter. Out-migrating smolts also benefitted from MDN resources via increased size and growth rates. Coho Salmon smolt abundance was unrelated to total spawner biomass, but a positive relationship between MDN assimilation and smolt abundance suggested a possible effect on overwinter survival. Furthermore, similar trends in spawner biomass and the abundance of age-1 smolts suggested that age at smolting was influenced by MDN. These relationships support the hypothesis that salmon spawner abundance during Coho and Chinook Salmon rearing is an important factor in the juvenile productivity of these species.

中文翻译:

幼年Coho和Chinook鲑鱼的生长,大小和状况与流域规模的鲑鱼Spawner丰度有关

太平洋太平洋鲑鱼Oncorhynchus spp。鲑鱼是同卵的,产卵成年鲑鱼(海洋来源的养分[MDN])产生的资源补贴使幼鲑鱼在淡水中养育时受益。但是,尚不清楚少年鲑鱼种群是否能够对分水岭规模的产卵鲑鱼的数量做出可预测的反应。为了解决假定的养育幼鱼的好处是否可以扩大到人口和分水岭规模,我们研究了幼鱼Coho Salmon Oncorhynchus kisutch和Chinook Salmon O. tshawytscha在整个阿拉斯加西部的Unalakleet河和North河中,MDN同化的增长,叉长,状况和丰度都与MDN同化有关。另外,一项标记回收实验提供了从这两条河中迁徙的鲑科鲑的丰度估计。在产卵之前,过去几年中残留的MDN对幼鲑几乎没有优势。但是,在产卵的成年虾到来后,幼鱼在秋季和冬季表现出MDN与鱼的大小,生长和状况之间的正相关关系。通过增加规模和增长率,MDN资源也使迁徙的小白鲑受益。Coho Salmon的软体动物丰富度与产卵总生物量无关,但是MDN同化和软体动物丰富度之间呈正相关关系,这可能对越冬存活率产生影响。此外,产卵生物量的类似趋势和1龄幼体的丰富性表明,mol育时的年龄受MDN的影响。这些关系支持以下假设:在Coho和Chinook鲑鱼饲养期间鲑鱼的产卵量是这些鱼类幼体生产力的重要因素。
更新日期:2020-04-15
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