Factors controlling abundance of downstream juvenile pink salmon ( <i>Oncorhynchus gorbus</i> <i>с</i> <i>ha</i>) in the Mi River

Abstract

Nonlinear multiplicative model is developed that describes dependence of the pink salmon juveniles abundance in the Mi River (Amur Estuary) on number of their parents and some meteorological factors. The spawning stock is the most significant factor that explains 44.7 % of the abundance dispersion. Among meteorological factors, winter air temperature correlates positively (23.9 % of dispersion) and air temperature during anadromous migration and spawning of pink salmon correlates negatively (5.8 % of dispersion) with the juveniles abundance. In sum, these factors explain 73.7 % of abundance variability for the downstream migrants. In the years with equal number of spawners, the highest abundance of juveniles can be in 6.69 times higher than their lowest abundance because of the meteorological factors influence.

Keywords

• тихоокеанские лососи
• численность родителей
• численность молоди
• метеорологические факторы
• имитационное моделирование