銀河宇宙線指数とマイワシSardinops melanostictus資源量の長期変動に関する研究

抄録

It is widely known that sardine have population cycles, and their population peaks every 60 and 300 years for multiple sardine species in distant ocean regions in the world. Recent studies by Tameishi have suggested (possible) correlation between sardine population cycles and Length of Day (LOD) and Geomagnetic Intensity (GEOM) derived from the fluctuation of earth’s outer liquid core (Holme and Viron, 2005). This study suggests another correlation between the Galactic Cosmic Ray Data (GCRD) and sardine population cycle. More specifically, sardine population and photon energy of galactic cosmic ray are positively correlated. The Index Galactic Cosmic Ray Data (GCRD) and the Index of Sardine Scale Deposition Rate (SSDR) were examined if they have correlations with Sardine Catch Volume (SCV), and followings were found out: (i) a statistically significant correlation between the Index of GCRD and the Index of SSDR: from 1951 to 2004 (R² = 0.877, p = 2.85E-25 < 0.001) and (ii) a statistically significant correlation between the Index of GCRD and the Sardine Catch Volume in Japan (SCV: from 1951 to 2004) (R² = 0.672, p = 3.59E-14 < 0.001). But, (iii) no statistically significant correlation between the Index of NPP and the Index of SSDR: from 1951 to 2004) (R² = 0.073, p = 0.052 > 0.05). It is possibly because photon energy of galactic cosmic ray stimulates atoms in the cells of sardine, then the atoms turn into excited states (so called excitation).