Multiple Correlation of Konbu Yields, Spring-herring Catch and the Coastal Temperature along the Southwest Coast of Hokkaido, Japan.

概要

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Yields of Hosome-konbu (Laminaria religiosa) up to 3 × 103 t and catches of spring-spawning herring (Culpea pallasii) in excess of 2 × 105 t had been landed from Shiribeshi district along the southwest coast of Hokkaido during the former half of this century. However, there is no migration of herring and yields of Hosome-konbu are on the decrease less than 102 t at present. Long-term coastal sea temperatures at Suttu in Shiribeshi district indicate a difference in sea conditions in winter between the cold-former half of this century and the warm-later. Regression of yields of Hosome-konbu (Y: t) to the variables of catches of spring-hering l year earlier (H&lt-1>: 103 t) and of favorable temperature indices (Ft) is given by Y=5.18H&lt-1>+8.67Ft+579 (R2=0.80, α=0.01, Fo=73.17 > F=5.39). This relationship indicates possible effects of spawned eggs and sperm by herring (0.80) and the environment (0.28) upon the decreases in yields and biomass of Hosome-konbu.
日本海洋学会の論文