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Warming climate impacts on production dynamics of southern populations of Pacific salmon in the North Pacific Ocean

Warming climate impacts on production dynamics of southern populations of Pacific salmon in the... This study reviews the evidence for warming climate impacts on ocean migration, growth, and survival of southern populations of Pacific salmon (Oncorhynchus spp.), in particular, Japanese chum salmon (O. keta). In this century, productivity of Asian and North American Pacific salmon declined in southern areas but increased in northern areas owing to a warming climate. Japanese chum salmon, mainly hatchery‐produced fish, are roughly divided into two populations: warm‐current populations (WCPs) affected by the Tsushima warm current and cold‐current populations (CCPs) affected by the Oyashio cold current. Their population size and survival rate have declined in Honshu since the late 1990s and in Hokkaido since the late 2000s. The decrease in population size of CCPs is greater than that of WCPs, suggesting that WCPs are relatively adaptable to global warming. A decline in survival rate and insufficient growth of juveniles in coastal habitats due to a shortened duration of coastal stay as a consequence of global warming was identified as the factor affecting the reduced production of Japanese chum salmon. The current situation of chum salmon is approaching that of the Jomon transgression period in Japan (7–5.5 kyr before present). Therefore, it is necessary to establish sustainable conservation management for southern populations of Pacific salmon under a warming climate regime. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Fisheries Oceanography Wiley

Warming climate impacts on production dynamics of southern populations of Pacific salmon in the North Pacific Ocean

Fisheries Oceanography , Volume 32 (1) – Jan 1, 2023

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References (37)

Publisher
Wiley
Copyright
© 2023 John Wiley & Sons Ltd
ISSN
1054-6006
eISSN
1365-2419
DOI
10.1111/fog.12598
Publisher site
See Article on Publisher Site

Abstract

This study reviews the evidence for warming climate impacts on ocean migration, growth, and survival of southern populations of Pacific salmon (Oncorhynchus spp.), in particular, Japanese chum salmon (O. keta). In this century, productivity of Asian and North American Pacific salmon declined in southern areas but increased in northern areas owing to a warming climate. Japanese chum salmon, mainly hatchery‐produced fish, are roughly divided into two populations: warm‐current populations (WCPs) affected by the Tsushima warm current and cold‐current populations (CCPs) affected by the Oyashio cold current. Their population size and survival rate have declined in Honshu since the late 1990s and in Hokkaido since the late 2000s. The decrease in population size of CCPs is greater than that of WCPs, suggesting that WCPs are relatively adaptable to global warming. A decline in survival rate and insufficient growth of juveniles in coastal habitats due to a shortened duration of coastal stay as a consequence of global warming was identified as the factor affecting the reduced production of Japanese chum salmon. The current situation of chum salmon is approaching that of the Jomon transgression period in Japan (7–5.5 kyr before present). Therefore, it is necessary to establish sustainable conservation management for southern populations of Pacific salmon under a warming climate regime.

Journal

Fisheries OceanographyWiley

Published: Jan 1, 2023

Keywords: archaeology; inter‐ and intra‐specific interaction; life history; Pacific salmon; population dynamics; sea surface temperature (SST); warming climate impact

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