Connectivity, stressors and responses within and across landscapes

This work aims to test how varying forms of connectivity interact with stressors (pollutants, disease, invasive species) to influence biodiversity and ecosystem function. Because different systems vary in their sensitivity to  stressors our studies target three landscapes with different exposures and sensitivities to different stressors; upland, lowland and urban.

Easedale Tarn (IJW, DSC_0062).jpg
A typical upland ecosystem in the Lake District


We will examine a range of responses to connectivity and stressors in our three contrasting landscapes, including:

  • system productivity and nutrient cycling,
  • gene flow and genetic diversity,
  • community composition in relation to dispersal capacity,
  • dissemination of disease agents across the landscape,
  • the transfer and remobilisation of legacy metal pollutants.


We hypothesise that the interaction between increasing connectivity and the strength and diversity of stressors will result in negative effects on biodiversity and ecosystem function in all landscapes, but that interaction strength and the synergistic or antagonistic effects exerted by multiple stressors will differ among landscapes.

Our results, which will provide the first harmonised datasets on these variables, will be used to characterise and predict how combinations of stressors and variation in connectivity influence biodiversity and ecosystem function in mixed landscapes.

North American signal crayfish, a non-native species to the UK