Nutritional correlates of the overwintering and seaward migratory decisions and long-term survival of post-spawning Atlantic salmon
| العنوان: | Nutritional correlates of the overwintering and seaward migratory decisions and long-term survival of post-spawning Atlantic salmon |
|---|---|
| المؤلفون: | Bruce G. Hatcher, Shelley Denny, Xavier Bordeleau, David A. Patterson, Glenn T. Crossin, Frederick G. Whoriskey |
| المصدر: | Conservation Physiology |
| بيانات النشر: | Oxford University Press, 2019. |
| سنة النشر: | 2019 |
| مصطلحات موضوعية: | 0106 biological sciences, Physiology, Management, Monitoring, Policy and Law, Biology, Lipid storage, 010603 evolutionary biology, 01 natural sciences, Long term survival, 14. Life underwater, Semelparity and iteroparity, Overwintering, reproductive and urinary physiology, Nature and Landscape Conservation, geography, geography.geographical_feature_category, urogenital system, 010604 marine biology & hydrobiology, Ecological Modeling, fungi, plasma triglycerides, Estuary, previously spawned, carryover effects, Fishery, Habitat, life history trade-offs, Acoustic telemetry, Plasma triglyceride level, Body condition, Research Article |
| الوصف: | Despite the importance of iteroparity (i.e. repeated spawning) for the viability of Atlantic salmon populations, little is known about the factors influencing the migratory behaviour and survival prospect of post-spawned individuals (kelts). To test the hypothesis that post-spawning nutritional condition underlies differences in spatiotemporal aspects of the habitat use and survival of migrating Atlantic salmon kelts, we physiologically sampled and acoustically tagged 25 individuals from the Middle River, Nova Scotia in autumn 2015. Kelts were subsequently tracked within their natal river during the winter months, and as far as 650 km away along known migration pathways towards the Labrador Sea and Greenland. Some kelts were detected nearly 2 years later, upon their return to the natal river for repeat spawning. Overall, kelts in poor or depleted post-spawning nutritional state (i.e. low body condition index or plasma triglyceride level): (i) initiated down-river migration earlier than higher condition kelts; (ii) experienced higher overwinter mortality in the natal river; (iii) tended to spend greater time in the estuary before moving to sea and (iv) did not progress as far in the marine environment, with a reduced probability of future, repeat spawning. Our findings suggest that initial differences in post-spawning condition are carried through subsequent migratory stages, which can ultimately affect repeat-spawning potential. These results point to the importance of lipid storage and mobilisation in Atlantic salmon kelts for mediating post-spawning migratory behaviour and survival. Lay summaries We tagged and physiologically sampled 25 Atlantic salmon kelts to test the hypothesis that differences in post-spawning condition are carried through their subsequent migration. We found that kelts in poor nutritional condition migrated down-river sooner and died to a greater extent in freshwater and at sea, ultimately affecting repeat-spawning potential. |
| اللغة: | English |
| تدمد: | 2051-1434 |
| URL الوصول: | https://explore.openaire.eu/search/publication?articleId=doi_dedup___::16d2e491b194b139d6375f9d0ef63691 http://europepmc.org/articles/PMC6919299 |
| حقوق: | OPEN |
| رقم الأكسشن: | edsair.doi.dedup.....16d2e491b194b139d6375f9d0ef63691 |
| قاعدة البيانات: | OpenAIRE |
| تدمد: | 20511434 |
|---|