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Abstract

A changing climate reshapes the range distribution of many organisms, and species with relatively low thermal optima, like many salmonids, are increasingly expected to face local population extinctions at lower latitudes. Understanding where and how fast these changes are happening is of pivotal importance for successful mitigation and conservation efforts.We used an extensive electrofishing database to explore temporal trends of juveniles of brown trout Salmo trutta in 218 locations from 174 Swedish streams, over the last 30 years (1991-2020). We hypothesized that 1) declines in abundance have occurred predominately in the warmer, southern regions, while increases have occurred in the colder, northern regions, 2) larger stream sizes may partly offset negative effects of climate, and 3) migrating and resident populations are affected differently by a warming climate.We found that abundance of brown trout juveniles generally declined in warmer regions especially in smaller streams (

Keywords

anadromous species; brown trout; climate; hydrological connectivity; temperature; temporal trends

Published in

Ecography
2023, number: 5, article number: e06522
Publisher: WILEY

SLU Authors

Global goals (SDG)

SDG13 Climate action
SDG14 Life below water

UKÄ Subject classification

Ecology

Publication identifier

  • DOI: https://doi.org/10.1111/ecog.06522

Permanent link to this page (URI)

https://res.slu.se/id/publ/121956