RELATIONSHIP BETWEEN SOLAR RADIATION AND DISTRIBUTION OF INTERTIDAL ORGANISMS ON GENTLY SLOPING REVETMENTS IN THE BRACKISH WATER AREA OF THE YOSHINO RIVER

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  • 吉野川汽水域の緩傾斜護岸における日射と潮間帯生物の分布の関係について

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<p> In order to find a way to deal with the problem of less shade and less biodiversity on the gently sloping masonry revetment, a survey was conducted on the relationship between solar radiation and the distribution of intertidal organisms on the gently sloping revetment of the Yoshino River brackish water area in the summer. The amount of solar radiation on the south-facing revetment at the survey site was approximately 1.4 times that of the north-facing revetment, and it was found that the south-facing revetment is strongly affected by solar radiation, tends to dry out, and has a high surface temperature. Correspondingly, the number of species and the coverage of the organisms on the surface of the revetment were smaller on the southfacing side than on the north-facing side. On the other hand, since the moist environment is maintained in the revetment gaps, even on the south-facing revetments, the number of species and the degree of coverage are higher than on the surface, and the seaweed (Caulacanthus okamurai) can also grow. In order to reduce the influence of solar radiation on gently sloping revetments and increase biodiversity, it was shown that it is important to appropriately provide gap structures that can maintain a moist environment.</p>

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