Species and origin specific susceptibility to bird predation among juvenile salmonids ...

• Main Author: Torbjörn
• Format: Article in Journal/Newspaper
• Language: English
• Published: Zenodo 2023
• Subjects: Atlantic salmon; Salmo salar
• Online Access: https://dx.doi.org/10.5281/zenodo.7549782; https://zenodo.org/doi/10.5281/zenodo.7549782

This repository includes all code and data for reproducing the analyses in Säterberg et al. (2023) "Species and origin specific susceptibility to bird predation among juvenile salmonids". Abstract: Juvenile salmonids often experience high mortality rates during migration and bird predation is a common source of mortality. Research suggests that hatchery-reared salmonids are more prone to predation than wild salmonids, and that Atlantic salmon (Salmo salar) experience lower predation than Sea trout (Salmo trutta), yet telemetry studies have displayed equivocal results. Here, using a large data set on PIT tagged hatchery-reared and wild juveniles of Atlantic salmon and Sea trout (25769 individuals) we investigate predation probability by piscivorous birds (mainly great cormorants Phalarocorax carbo) on salmonids originating from River Dalälven in Sweden. Bird colonies and roosting sites were scanned annually (2019-2021) and the temporal dynamics of bird predation on salmonids released in 2017-2021 was ...