Brown trout thermal niche and climate change: expected changes in the distribution of cold-water fish in central Spain

Santiago Saez, Jose Maria and Garcia De Jalon Lastra, Diego and Alonso González, Carlos and Solana Gutierrez, Joaquin and Rybalaigua Batalla, Jaime and Pórtoles, Javier and Monjo, Robert (2015). Brown trout thermal niche and climate change: expected changes in the distribution of cold-water fish in central Spain. "Ecohydrology" ; pp. 1-15. ISSN 1936-0584. https://doi.org/10.1002/eco.1653.

Description

Title: Brown trout thermal niche and climate change: expected changes in the distribution of cold-water fish in central Spain
Author/s:
  • Santiago Saez, Jose Maria
  • Garcia De Jalon Lastra, Diego
  • Alonso González, Carlos
  • Solana Gutierrez, Joaquin
  • Rybalaigua Batalla, Jaime
  • Pórtoles, Javier
  • Monjo, Robert
Item Type: Article
Título de Revista/Publicación: Ecohydrology
Date: 25 June 2015
Subjects:
Faculty: E.T.S.I. Montes (UPM)
Department: Sistemas y Recursos Naturales
Creative Commons Licenses: Recognition - No derivative works - Non commercial

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Abstract

This paper addresses the determination of the realized thermal niche and the effects of climate change on the range distribution of two brown trout populations inhabiting two streams in the Duero River basin (Iberian Peninsula) at the edge of the natural distribution area of this species. For reaching these goals, new methodological developments were applied to improve reliability of forecasts. Water temperature data were collected using 11 thermographs located along the altitudinal gradient, and they were used to model the relationship between stream temperature and air temperature along the river continuum. Trout abundance was studied using electrofishing at 37 sites to determine the current distribution. The RCP4.5 and RCP8.5 change scenarios adopted by the International Panel of Climate Change for its Fifth Assessment Report were used for simulations and local downscaling in this study. We found more reliable results using the daily mean stream temperature than maximum daily temperature and their respective seven days moving-average to determine the distribution thresholds. Thereby, the observed limits of the summer distribution of brown trout were linked to thresholds between 18.1ºC and 18.7ºC. These temperatures characterise a realised thermal niche narrower than the physiological thermal range. In the most unfavourable climate change scenario, the thermal habitat loss of brown trout increased to 38% (Cega stream) and 11% (Pirón stream) in the upstream direction at the end of the century; however, at the Cega stream, the range reduction could reach 56% due to the effect of a ?warm-window? opening in the piedmont reach.

More information

Item ID: 37468
DC Identifier: http://oa.upm.es/37468/
OAI Identifier: oai:oa.upm.es:37468
DOI: 10.1002/eco.1653
Official URL: http://onlinelibrary.wiley.com/doi/10.1002/eco.1653/abstract?isLogout=true
Deposited by: Memoria Investigacion
Deposited on: 17 Nov 2015 09:32
Last Modified: 17 Jun 2019 06:56
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