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| DOI | 10.1111/jfb.15693 |
| Atlantic salmon Salmo salar do not prioritize digestion when energetic budgets are constrained by warming and hypoxia | |
| 发表日期 | 2024 |
| ISSN | 0022-1112 |
| EISSN | 1095-8649 |
| 英文摘要 | During summer, farmed Atlantic salmon (Salmo salar) can experience prolonged periods of warming and low aquatic oxygen levels due to climate change. This often results in a drop in feed intake; however, the physiological mechanism behind this behaviour is unclear. Digestion is a metabolically expensive process that can demand a high proportion of an animal's energy budget and might not be sustainable under future warming scenarios. We investigated the effects of elevated temperature and acute hypoxia on specific dynamic action (SDA; the energetic cost of digestion), and how much of the energy budget (i.e. aerobic scope, AS) was occupied by SDA in juvenile Atlantic salmon. AS was 9% lower in 21 degrees C-acclimated fish compared to fish reared at their optimum temperature (15 degrees C) and was reduced by similar to 50% by acute hypoxia (50% air saturation) at both temperatures. Furthermore, we observed an increase in peak oxygen uptake rate during digestion which occupied similar to 13% of the AS at 15 degrees C and similar to 20% of AS at 21 degrees C, and increased the total cost of digestion at 21 degrees C. The minimum oxygen tolerance threshold in digesting fish was similar to 42% and similar to 53% at 15 and 21 degrees C, respectively, and when digesting fish were exposed to acute hypoxia, gut transit was delayed. Thus, these stressors result in a greater proportion of the available energy budget being directed away from digestion. Moderate environmental hypoxia under both optimal and high temperatures severely impedes digestion and should be avoided to limit exacerbating temperature effects on fish growth. |
| 英文关键词 | aquaculture; climate change; fish; specific dynamic action |
| 语种 | 英语 |
| WOS研究方向 | Fisheries ; Marine & Freshwater Biology |
| WOS类目 | Fisheries ; Marine & Freshwater Biology |
| WOS记录号 | WOS:001179166900001 |
| 来源期刊 | JOURNAL OF FISH BIOLOGY
 |
| 文献类型 | 期刊论文 |
| 条目标识符 | http://gcip.llas.ac.cn/handle/2XKMVOVA/289652 |
| 作者单位 | University of Queensland; University of Queensland |
| 推荐引用方式 GB/T 7714 | . Atlantic salmon Salmo salar do not prioritize digestion when energetic budgets are constrained by warming and hypoxia[J],2024. |
| APA | (2024).Atlantic salmon Salmo salar do not prioritize digestion when energetic budgets are constrained by warming and hypoxia.JOURNAL OF FISH BIOLOGY. |
| MLA | "Atlantic salmon Salmo salar do not prioritize digestion when energetic budgets are constrained by warming and hypoxia".JOURNAL OF FISH BIOLOGY (2024). |
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