Dynamic responses of key economic species in the Northwest Pacific to fisheries-induced evolution: a study on different life history strategies
摘要
Increasing evidence shows that fishing activities can trigger evolutionary changes in fish life history traits and thus affect population dynamics. In this study, an individual-based eco-evolutionary model was applied to investigate the impact of fisheries-induced evolution (FIE) under varying fishing pressures. The study focused on four economically important species in the Northwest Pacific representing four life history strategies: Sardinops melanostictus (opportunistic strategists), Scomber japonicus (intermediate strategists), Thunnus alalunga (periodic strategists), and Prionace glauca (equilibrium strategists). As expected, we found that selective fishing drove these species to evolve toward faster life history strategies, and that the resulting FIE further amplified such changes. Under high fishing pressures, the rate of change in the life history traits of S. melanostictus and S. japonicus was more pronounced, but T. alalunga and P. glauca showed slower changes. The changes allowed the evolved species to maintain larger population sizes during fishing, especially the species with a short lifespan. However, the impact of the above changes on biomass exhibited the more complex patterns. Moreover, FIE significantly influenced the post-fishing recovery of population dynamics and life history traits. Even after fishing ceased, evolved species failed to fully recover and their recovery capacity was closely related to their life history strategies. As the fishing pressure increased, the recovery capacity of fishing populations slowed down. Therefore, reducing fishing pressure aids in population recovery, particularly the species with a long lifespan. This study revealed the impact of FIE on the adaptive dynamics of fish populations and contributed to fisheries management strategies and sustainable utilization.