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  • 2020Crafish plague affects juvenile survival and adult behaviours of invasive signal crayfish

    Accepted author manuscript, 301 KB, PDF document

    Embargo ends: 31/12/99

    Licence: CC BY-NC-ND Show licence

  • John Rhidian Thomas
    Cardiff School of Biosciences, Cardiff University
  • Chloe Robinson
    Swansea University
  • Agata Mrugała
    Charles University Prague
  • Amy Ellison
  • Emily Matthews
    Cardiff School of Biosciences, Cardiff University
  • Sian Griffiths
    Cardiff School of Biosciences, Cardiff University
  • Sofia Consuegra
    Swansea University
  • Jo Cable
    Cardiff School of Biosciences, Cardiff University
The spread of invasive, non-native species is a key threat to biodiversity. Parasites can play a significant role by influencing their invasive host’s survival or behaviour, which can subsequently alter invasion dynamics. The North American signal crayfish (Pacifastacus leniusculus) is a known carrier of Aphanomyces astaci, an oomycete pathogen that is the causative agent of crayfish plague and fatal to European crayfish species, whereas North American species are considered to be largely resistant. There is some evidence, however, that North American species, can also succumb to crayfish plague, though how A. astaci affects such ‘reservoir hosts’ is rarely considered. Here, we tested the impact of A. astaci infection on signal crayfish, by assessing juvenile survival and adult behaviour following exposure to A. astaci zoospores. Juvenile signal crayfish suffered high mortality 4-weeks post-hatching, but not as older juveniles. Furthermore, adult signal crayfish with high infection levels displayed altered behaviours, being less likely to leave the water, explore terrestrial areas and exhibit escape responses. Overall, we reveal that A. astaci infection affects signal crayfish to a much greater extent than previously considered, which may not only have direct consequences for invasions, but could substantially affect commercially harvested signal crayfish stocks worldwide.
Original languageEnglish
JournalParasitology
Publication statusAccepted/In press - 21 Jan 2020
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