Bringing Back the Manchester Argus Coenonympha tullia ssp. davus (Fabricius 1777): Quantifying the habitat resource requirements to inform the successful reintroduction of a specialist peatland butterfly

2021-30 has been designated the UN decade of ecosystem restoration.  A landscape scale peatland restoration project is being undertaken on Chat Moss, Greater Manchester, UK, with conservation translocations an important component of this work.  The Manchester Argus Coenonympha tullia ssp. davus, a specialist butterfly of lowland raised bogs in the northwest of England, UK is under threat due to severe habitat loss and degradation.  A species reintroduction was planned for spring 2020.  
This study aimed to quantify the resource thresholds for C. tullia, in order to assess potential risks for the project.  Thirteen peatland habitat patches with either recent historic or current C. tullia populations were surveyed for biotic and abiotic factors based on previous qualitative research on the species’ requirements.  
Percentage cover of two habitat resources were found to be the strongest predictors in models of C. tullia presence: cross-leaved heath Erica tetralix and hair’s-tail cotton-sed...