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Can energy depletion of wild Atlantic salmon kelts negotiating hydropower facilities lead to reduced survival?
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SYSNO ASEP 0538806 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Can energy depletion of wild Atlantic salmon kelts negotiating hydropower facilities lead to reduced survival? Author(s) Baktoft, H. (DK)
Gjelland, K.O. (NO)
Szabo-Meszaros, M. (NO)
Silva, A.T. (NO)
Říha, Milan (BC-A) RID, ORCID
Okland, F. (NO)
Alfredsen, K. (NO)
Forseth, T. (NO)Number of authors 8 Article number 7341 Source Title Sustainability. - : MDPI
Roč. 12, č. 18 (2020), s. 1-12Number of pages 12 s. Language eng - English Country CH - Switzerland Keywords high-resolution 3D telemetry ; 3D hydraulic modeling ; anthropogenic structures ; river connectivity ; energetics model ; energy expenditure Subject RIV EG - Zoology OECD category Zoology Method of publishing Open access Institutional support BC-A - RVO:60077344 UT WOS 000584282200001 EID SCOPUS 85091707185 DOI 10.3390/su12187341 Annotation Repeat spawners constitute an important component of Atlantic salmon populations, but survival of post-spawning individuals (kelts) are often compromised by anthropogenic structures such as hydropower plants (HPPs). Potential effects of HPPs include migration delays and associated increased energy depletion, which potentially results in increased overall mortality. We combined a detailed 3D hydraulic model with high-resolution 3D tracking of tagged kelts (length 73-104 cm) to obtain estimates of kelt movement through water. These estimates were then used in an energetics model to estimate hourly energy expenditure while negotiating the HPP area. Hourly kelt energy expenditure varied between 0.8 and 10.1 kJ x h(-1) and was dependent on kelt length. Degree of additional energy depletion can amount to several percent of remaining energy content (our study indicates 4-5 percentage points) potentially leading to reduced post-spawning survival. In turn, this can nullify the iteroparous breeding strategy and jeopardize long-term stability and persistence of Atlantic salmon populations inhabiting HPP rivers. Workplace Biology Centre (since 2006) Contact Dana Hypšová, eje@eje.cz, Tel.: 387 775 214 Year of Publishing 2021 Electronic address https://doi.org/10.3390/su12187341
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