Abstract
The Propagule Pressure Index (PPI) is commonly used in riverine systems to understand the environmental impacts of non-native species introductions. As not all introduction events are equal, we propose refinements to the PPI equation formalised by Bennett et al. (2010) to account for availability of introduced fish (a) and annual mortality rates (m) of fish in lakes. Using simulated data, we show that the adjusted metric (adjPPI) is lower, with the greatest magnitude of difference from PPI when a is low and m is high. The adjusted PPI can calculate a more realistic impact estimate for researchers and environmental managers.
Citation
Lothian, A.J. and Kissinger, B.C. (2026), Adjusting the Riverine Propagule Pressure Index for Fish Introduction Events in Lakes: A Theoretical Framework. Aquatic Conserv: Mar Freshw Ecosyst, 36: e70436. https://doi.org/10.1002/aqc.70436