Final answer:
Introduction of rainbow trout changed fishing practices, with efforts becoming initially dispersed and later concentrated in areas of high trout abundance. The alteration in ecosystems further influenced spatial fishing over time.
Step-by-step explanation:
After the introduction of the rainbow trout (Oncorhynchus mykiss), the spatial aspects of fishing changed notably. Fishing efforts became more dispersed across various locations, as fishermen would have initially targeted diverse habitats to locate areas with high abundance of rainbow trout. Over time, as the habitats and regions where rainbow trout thrived became known, fishermen concentrated their efforts in those specific zones. Rainbow trout have been known to replace native species, such as cutthroat trout, due to their competitive nature. In environments where the ecosystem has been altered, such as reduced high flow events in rivers leading to changes in habitat, the non-native trout species have been able to increase in density and biomass. This indicates that temporal changes, such as the impact on native species and habitat alteration, can also influence spatial fishing practices over the long term.