Fishing pressure and species traits affect stream fish invasions both directly and indirectly

• DOI: 10.1111/ddi.12747
• Publication Date: 2018-04-10T00:51:18Z
• Authors: Brandon K. Peoples; Stephen R. Midway
• Keywords: Propagule pressure; Trait

Abstract Aim We sought to identify direct and indirect effects of factors contributing establishment spread 272 stream fish species. Location Two hundred ninety‐seven watersheds in the eastern United States. Methods modelled two variables: (1) whether a species had become established outside its native range ( ) (2) number which their ). estimated these variables by comparing historical distributions rich data set contemporary sampling. calculated metrics human use (indexing propagule pressure), gathered trait from an open‐access database. then used piecewise path analysis estimate use, size traits on introductions. Results identified hierarchical causal structure fishing pressure were important determinants Species some effects, but played more role. Native was significantly affected thermal tolerance diet breadth. Likewise, life history strategy: larger‐bodied, longer‐living fecund positively associated with pressure. Main conclusions Functional can confer advantage during phase, is for subsequent dispersal throughout non‐native range. However, non‐random, largely function traits. Considering both across stages invasion process help elucidate full role invasions.