High summer temperatures are associated with poorer performance of underyearling Atlantic salmon (Salmo salar) in upland streams
Authors:
Publication Type:
Journal Article
Year of Publication:
2022
Secondary Title:
Journal of Fish Biology
DOI:
10.1111/jfb.15282
Year:
2022
Abstract
Future warming scenarios are predicted to result in an increased frequency of high, and potentially stressful, temperatures in aquatic ecosystems. Here we examined whether the performance of wild underyearling Atlantic salmon (Salmo salar) in Scottish streams stocked with identical egg densities was influenced by thermal stress. Biomass and density declined with degree hours exceeding 23°C, indicating apparent mortality or emigration as a possible result of exposure to high temperatures. These results strengthen the need for further action such as riparian tree planting to reduce stream summer temperatures.
