Filter products by Segment
Filter products by Technology
Select a Product
Select a Product
Select a Product
Filter products by Technology
Select a Product
Filter products by Technology
Select a Product
Select a Product
Filter products by Technology
Select a Product
Select a Product
Select a Product
Help us find what you are looking for by searching for species, products, technologies and other keywords.
Abstract
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 × 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.
Publication Date
SEPTEMBER 7, 2020
Keywords
guillemots, light-level geolocation, murres, Uria aalge, Uria lomvia
PUBLICATION AVAILABLE AT: https://onlinelibrary.wiley.com/doi/pdf/10.1111/jbi.13883
Join our mailing list for all the latest information on product releases and updates.