Occurrence of Isoyake in kelp beds of Saccharina japonica in Primorskii, far-east Russia

Tadashi Kawai; Akiyoshi Shinada; Tatiana Krupnova; Norishige Yotsukura

doi:10.29244/HAJ.3.1.46

Tadashi Kawai Hokkaido Research Organization
Akiyoshi Shinada Salmon and Freshwater Research Institute, 3–373 Kita-Kashiwagi, Eniwa, Hokkaido 061-0433, Japan
Tatiana Krupnova Pacific branch of VNIRO (“TINRO”), 4, pereulok Shevchenko, Vladivostok, 690091, Russia
Norishige Yotsukura Hokkaido University, North 9, West 9, Kita-ku, Sapporo, Hokkaido 060–0809, Japan

DOI: https://doi.org/10.29244/HAJ.3.1.46

Keywords: algae, seaweed, Japan

Abstract

A decline in the abundance of the seaweed Saccharina japonica has occurred in Primorskii, far-eastern Russia. Most of the seaweed has disappeared at this location, resulting in a barren coastline known as Isoyake. Field surveys conducted from 1975 to 2015 in Valentin Bay revealed a significant decline in the seaweed population. This decline correlated with fluctuating water temperatures. In the period 1980 to 1990, water temperatures tended to be lower, then increased in the period 2000–2010, and again decreased in temperatures in 2010–2019. Despite lower temperatures after 2010, Isoyake persisted. These findings emphasize the need for continued monitoring and deeper investigation of the environmental and ecological drivers behind Isoyake, with implications for conservation and sustainable management of seaweed resources in far-east Russia.

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