Estimation of some climatic factors influence on abundance of Asian pink and chum salmons
Climatic factors influence on abundance of Asian pink and chum salmons is tested on the data about their catches from NPAFC statistics for 1925-2010. The atmospheric and oceanographic conditions are evaluated by standard indices AFI, ALPI, NP, PCI, GLB.Ts + dSST, N.HEMI, PDO, LOD, the number of Sun spots is also considered. The best links are found for the time series smoothed by 2-points moving average, both for catches and climatic indices. The salmon catches have the maximal correlation with the monthly indices of air temperature and SST averaged for the whole globe and Northern Hemisphere (GLB.Ts + dSST and N.HEMI); the correlation coefficients are 0.82-0.89 for chum salmon, 0.54-0.64 for pink salmon, and 0.74-0.78 for their summary catch. Other indices have lower relationship with the salmon catches; the correlation coefficients don't exceed ±0.3. So, there are no significant correlations between the pink and chum salmon catch dynamics and those climate indices. The multiple regression shows an indirect effects of the set of climatic variables (AFI, ALPI, GLB.Ts + dSST, N.HEMI, PDO) with the maximal correlation coefficients 0.88 for chum salmon, 0.61 for pink salmon, and 0.77 for their summary catch. These preliminary data could be used for further investigations of climate change influence on abundance of pacific salmon mass species with more detailed consideration of its effects on the ecosystems of the Bering Sea and North Pacific.