North Pacific Anadromous Fish Commission

Technical Report 11

Table of Contents

Activity of Extreme Environmental Factors as a Reason for Pink Salmon Abundance Decline in the Sakhalin-Kuril Region, Russia

Authors:
Alexander M. Kaev

Abstract Excerpt:
Some changes in pink salmon abundance from 2007–2017 have been studied on Iturup Island and four areas of the eastern Sakhalin coast. An abrupt decline in abundance was observed in broodlines which appeared to be due to the influence of extreme environmental factors. The extreme events were both the floods caused by abnormal high precipitation that destroyed spawning grounds, and the storms on the seacoast during the mass fry downstream migrations to the sea. Estimated run sizes of pink salmon in 2017 in the monitored areas fully agreed with the ascertained dependences for the preceding period. These results show a decisive role of extreme environmental factors in pink salmon abundance formation.

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DOI:
https://doi.org/10.23849/npafctr11/17.21

Citation

Kaev, A.M.  2018.  Activity of extreme environmental factors as a reason for pink salmon abundance decline in the Sakhalin-Kuril Region, Russia.  N. Pac. Anadr. Fish Comm. Tech. Rep. 11: 17–21.  https://doi.org/10.23849/npafctr11/17.21