CHANGES IN THE DISTRIBUTION OF INTERTIDAL ATTACHED ORGANISMS OF UPRIGHT STRUCTURES WITH DECREASING NUTRIENTS IN OSAKA BAY

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  • 大阪湾の栄養塩低下と直立構造物の潮間帯付着生物の分布変化

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<p> To clarify the relationship between attached organisms and decreasing nutrients, we investigated attached organisms in the coastal area of Osaka Bay. There was no significant change in the biota, but the number of species of seaweeds in the spring increased in the inner part of the bay, and the number of attached animals in the summer increased south of inner part in Osaka Bay. In addition, the number of attached animal species increased south of inner part at Osaka Bay in summer. Some of the attached organisms have expanded their spatial distribution to the inner part of the Osaka bay. Water quality changes in the coastal areas of Osaka Bay were examined using long-term monitoring data. The results showed that nutrients in the coastal areas of Osaka Bay have decreased since 2000. Distribution of some species that showed characteristic habitat distributions, were analyzed the factors contributing to the distributions, and the results indicated that nutrients contributed to the spring distribution. The results suggest that low nutrient levels in coastal areas of Osaka Bay affect the distribution of attached organisms.</p>

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