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Diseases of Aquatic Organisms

    DAO prepress abstract   -  DOI: https://doi.org/10.3354/dao03502

    Occurrence of Batrachochytrium dendrobatidis in Sweden: higher infection prevalence in southern species

    Sara Meurling*, Simon Kärvemo, Niki Chondrelli, Maria Cortazar Chinarro, David Åhlen, Lola Brookes, Per Nyström, Marika Stenberg, Trenton W. J. Garner, Jacob Höglund, Anssi Laurila

    *Corresponding author:

    ABSTRACT: The chytrid fungus Batrachochytrium dendrobatidis (Bd) has caused worldwide declines in amphibian populations. While Bd is widespread in southern and central Europe, its occurrence and distribution in northernmost Europe is mostly unknown. We surveyed for Bd in breeding anurans in Sweden by sampling 1917 amphibians from 101 localities and three regions in Sweden (Southern, Northern and Central). We found that Bd was widespread in southern and central Sweden, occurring in all nine investigated species and in 45.5% of the 101 localities with an overall prevalence of 13.8%. No infected individuals were found in the four northern sites sampled. The records from central Sweden represent the northernmost records of Bd in Europe. While the proportion of sites positive for Bd was similar between the southern and central regions, prevalence was much higher in the southern region. This was due to southern species with a distribution mainly restricted to southernmost Sweden having higher prevalence than widespread generalist species. The nationally red-listed green toad Bufotes variabilis and the fire bellied toad Bombina bombina had the highest prevalence (61.4% and 48.9% respectively). Across species, Bd prevalence was strongly positively correlated with water temperature at the start of egg-laying. However, no individuals showing visual signs of chytridiomycosis were found in the field. These results indicate that Bd is widespread and common in southern and central Sweden with southern species breeding in higher temperatures and with longer breeding periods having higher prevalence. However, the impact of Bd on amphibian populations in northernmost Europe remains unknown.