Luc Phillips: Claws for concern - assessing the impact of an emerging aquatic invader through a multi-method approach

Luc Phillips (BSc Environmental Science) joins us to discuss this research project on the invasive potential of the Narrow-clawed crayfish within UK rivers. More specifically, we delve into how research methods such as kick sampling, crayfish trapping, stable isotope analysis and species distribution modelling were utilised to uncover different dimensions of this species’ impact. The episode also examines the broader implications of the study for invasive species research, management and legislation. Episode summary:Within the UK, there are thought to be 3343 non-native species, with 14 of these being freshwater invasive species established in or along 10% (or greater) of the country’s land area or coastline (JNCC, 2024). Amongst the most successful of these aquatic invaders are Non-Indigenous Crayfish Species (NICS), a group of decapod crustaceans which can greatly impact the ecological integrity of riverine systems and their native flora and fauna (O’Hea Miller et al., 2024). That said, despite there being seven established NICS within England alone, much of the literature has focused upon Signal crayfish, leaving knowledge gaps surrounding the invasive potential of the other species (Harwood et al., 2025). This study discussed within this podcast therefore sought to create a foundational understanding of the ecological impacts associated with one of these understudied species, the Narrow-clawed crayfish, by deploying a multi-method approach comprised of field data collection, stable isotope analysis and species distribution modelling. This study’s findings suggested that Narrow-clawed crayfish alter macroinvertebrate community structure, potentially through predation. Moreover, under current climatic conditions, there are large expanses of land within Northern England and Eastern Scotland which may be suitable for the species to occupy. Future studies will likely need to develop this research further by focusing on one of the utilised research methods. This will allow for individual aspects of the species’ invasion ecology to be explored in greater depth, helping to create species-specific management measures and policy interventions. Additionally, researchers may also use this methodological framework to assess the invasive potential of other emerging aquatic invasive species.Episode guest: Luc Phillips, BSc Environmental ScienceEpisode host: Prof Simon KempEpisode editor: Jack DinhamThe Meliora Podcast Student Research Symposium is part of the 2026 Student Takeover Season where we celebrate the fantastic sustainability research work of our Undergraduate Students.