Influence of Extreme Environmental Factors on the Dynamics of Abundance of the Pink Salmon Oncorhynchus gorbuscha

Technical Report 11

“…But even if the timing series of environmental factors coincides, this does not always lead to similar results. Thus, the dates with strong winds in Aniva Bay and southeastern Sakhalin coast often concurred, however, they did not equally affect the formation of pink salmon abundance in these areas because of different timing of fry migrations (Kaev 2018). When reporting regional characteristics of the negative cyclonic impact on pink salmon reproduction, we should also note that in southern areas this impact was mainly manifested through the storms in the juvenile feeding period, and in northern areas it manifested through the soil erosion on spawning grounds during floods.…”

“…Based on the results of these studies we suggested that in 2017 the pink salmon abundance in southern areas of the region would remain low, and in northern areas, significant decline would be inevitable because of the record high autumn precipitation (Kaev 2018). This scenario was fully realized in eastern Sakhalin, but on Iturup Island, at first glance, the prediction was not true.…”

Analysis of Steller's Sea Eagle reproduction efficiency on Sakhalin Island using Generalized Linear Mixed Models (GLMM)

“…Численность горбуши колеблется с огромным размахом, что связано с двухлетним циклом её онтогенеза и наличием, таким образом, двух независимых субпопуляций («линий»), каждая со своей собственной динамикой [11]. Как правило, наблюдаются колебания с периодичностью два года, имеющие характер пилообразной кривой, что Рис.…”