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Evidence of energy and nutrient transfer from invasive pink salmon (Oncorhynchus gorbuscha) spawners to juvenile Atlantic salmon (Salmo salar) and brown trout (Salmo trutta) in northern Norway
Ecology of Freshwater Fish ( IF 1.8 ) Pub Date : 2020-11-16 , DOI: 10.1111/eff.12582
Kathy Dunlop 1 , Antti P. Eloranta 2, 3 , Erik Schoen 4 , Mark Wipfli 5 , Jenny L.A. Jensen 6 , Rune Muladal 7 , Guttorm N. Christensen 6
Affiliation  

Recent large influxes of non‐native Pacific pink salmon (Oncorhynchus gorbuscha) to North European rivers have raised concern over their potential negative impacts on native salmonids and recipient ecosystems. The eggs and carcasses of semelparous pink salmon may provide a significant nutrient and energy subsidy to native biota, but this phenomenon has not been widely documented outside the species' native distribution. We analysed the stomach contents and stable isotope values (δ15N and δ13C) in muscle and liver tissues of juvenile Atlantic salmon (Salmo salar) and brown trout (Salmo trutta) to determine whether these native salmonids utilise marine‐derived nutrients and energy provided by pink salmon eggs and carcasses in the subarctic river system Vesterelva, northern Norway. Although egg foraging and assimilation of marine‐derived nutrients in fish body tissues were found to be minor at the population level, a few juvenile salmon and trout had recently eaten large quantities of pink salmon eggs. Some of these individuals also had high δ15N and δ13C values, indicating a long‐term diet subsidised by marine‐derived nutrients and energy from pink salmon eggs. Hence, our study provides novel evidence that the eggs of invasive pink salmon may provide an energetic, profitable food resource for juvenile native fish. More research is needed to understand the broader ecological implications for fishes and other biota in river ecosystems invaded by pink salmon.

中文翻译:

能量和养分从入侵粉红鲑鱼(Oncorhynchus gorbuscha)产卵器转移到挪威北部的幼大西洋大西洋鲑鱼(Salmo salar)和褐鳟(Salmo trutta)的证据

最近大量非本地太平洋粉红鲑鱼(Oncorhynchus gorbuscha)涌入北欧河流,引起了人们对其潜在对本地鲑鱼和受体生态系统的潜在负面影响的担忧。粗粉状鲑鱼的卵和car体可能为原生生物群提供重要的营养和能量补贴,但是这种现象尚未在该物种的原生分布范围之外得到广泛记载。我们分析了胃内容物和稳定同位素值(δ 15 N和δ 13 C)在少年大西洋鲑的肌肉和肝脏组织(大西洋鲑)和鳟(褐鳟)以确定这些原生鲑鱼是否利用了挪威北部亚北极河系Vesterelva中粉红色鲑鱼卵和cas体提供的海洋来源的养分和能量。尽管在种群水平上觅食和吸收鱼体组织中海洋来源的营养成分很少,但是最近有一些幼鲑鱼和鳟鱼食用了大量的粉红鲑鱼卵。其中一些人也有高δ 15 N和δ 13C值,表明长期饮食受到海洋来源的营养物质和粉红鲑鱼卵的能量的补贴。因此,我们的研究提供了新的证据,即入侵粉红鲑鱼卵可能为幼年本地鱼类提供一种充满活力,有利可图的食物资源。需要更多的研究来了解粉红色鲑鱼入侵的河流生态系统中鱼类和其他生物群的更广泛的生态意义。
更新日期:2020-11-16
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