DOI: 10.5061/dryad.47d7wm3s5
title: Eco-evolutionary responses of a cold-water fish (Salmo trutta) to the combined effects of an emerging pathogen and temperature

description: This dataset contains genetic, phenotypic, demographic, and environmental
 data from wild brown trout (Salmo trutta) populations sampled along
 natural gradients of water temperature and infection prevalence by
 Tetracapsuloides bryosalmonae, the parasite responsible for proliferative
 kidney disease (PKD). It includes single nucleotide polymorphisms (SNPs),
 genotypes at an immune-related gene (MHC-DAB), individual-level metrics of
 body condition and carotenoid-based coloration, as well as population
 density, infection prevalence, and water temperature records. Sampling was
 conducted both before and after seasonal disease outbreaks, enabling
 temporal comparisons. The dataset was used to investigate how pathogen
 pressure and thermal stress affect genetic and phenotypic variation, and
 to disentangle the roles of phenotypic plasticity and viability selection
 in wild populations. This resource is suitable for reuse in studies of
 eco-evolutionary dynamics, host–pathogen interactions, and climate-related
 stress responses in freshwater ecosystems. No identifiable human data are
 included, and all field sampling was conducted under appropriate ethical
 and legal permits.
description: # Dryad dataset Dataset DOI:
 [10.5061/dryad.47d7wm3s5](10.5061/dryad.47d7wm3s5) ## Description of the
 data and file structure **"Duvaletal2025_MHC_858ind.txt"** and
 **"Duvaletal2025_SNPs_141loci.txt"** contain the MHC and SNP
 genotypes, respectively, for 858 brown trout individuals sampled from 15
 populations described in Supplementary Tables S1 and S2.
 **"Duvaletal2025_model_pop_parameters.txt"** includes the
 environmental, morphological, and genetic variables used in the
 statistical analyses conducted in the study. ### Files and variables ####
 File: Duvaletal2025\_CMH\_858ind.txt **Description:**  ##### Variables *
 code: Pop x Session id * Pop: Pop name * Ind: Ind name * DAB: MHC-DAB
 genotype * MHC1: Haplotype 1 * MHC2: Haplotype 2 #### File:
 Duvaletal2025\_SNPs\_141loci.txt **Description:**  ##### Variables * Pop:
 Pop name * Ind: Ind name * SNP genotype for each lous #### File:
 Duvaletal2025\_model\_pop\_parameters.txt **Description:**  #####
 Variables * Pop: Pop name * Temp_moy: Mean temperature * Prevalence:
 Infection prevalence measured during S2 * Density_S1: Number of trout
 caught per minute using single-pass electrofishing surveys in S1 *
 Density_S2: Number of trout caught per minute using single-pass
 electrofishing surveys in S2 * Delta_density: Variation in brown trout
 density across summer * K_S1: Mean body condition factor in S1 * K_S2:
 Mean body condition factor in S2 * Delta_K: Variation in mean body
 condition across summer * Mean_area_carotenoid_S1: Mean area of
 carotenoids in S1 * Mean_area_carotenoid_S2: Mean area of carotenoids in
 S2 * Delta_area_carotenoid: Variation in mean area of carotenoid across
 summer * Mean_area_melanine_S1: Mean area of melatonine in S1 *
 Mean_area_melanine_S2: Mean area of melatonine in S1 *
 Delta_area_melanine: Variation in mean area of melanine across summer *
 N_all_SNPs_141sc_S1: Total number of SNPs (141 loci) in S1 *
 N_all_SNPs_141_S2: Total number of SNPs (141 loci) in S2 *
 Delta_N_all_SNPs_141: Variation in the number of SNPs between S1 and S2 *
 He_SNPs_S1_141: Expected heterozygosity at the SNPs loci in S1 *
 He_SNPs_S2_141: Expected heterozygosity at the SNPs loci in S2 *
 Delta_He_SNPs_141: Variation in He between S1 and S2 * FST_SNPs: Pairwise
 FST values between S1 and S1 for each site at the SNPs *
 SignificativiteFSTSNP: Significativity of Fst values (SNPs) *
 N_all_CMH_S1: Total number of haplotypes at MHC-DAB locus in S1 *
 N_all_CMH_S2: Total number of haplotypes at MHC-DAB locus in S2 *
 Delta_N_all_CMH: Variation in the total number of haplotypes at MHC-DAB *
 He_CMH_S1: Expected heterozygosity at the MHC-DAB locus in S1 * He_CMH_S2:
 Expected heterozygosity at the MHC-DAB locus in S2 * Delta_He_CMH:
 Variation in He at MHC-DAB between S1 and S2 * FST_CMH: Pairwise FST
 values between S1 and S1 for each site at the MHC-DAB *
 SignificativiteFstCMH: Significativity of Fst values (MHC)