藻場造成と維持に関する研究(学会賞受賞講演)

概要

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The authors attempted to examine the use of the Habitat Suitability Index (HSI) Model for quantitative estimation of Sargassum spp. seaweed bed in the case of low biological and physical disturbances on the coast of Kunda Cove in the western part of Wakasa Bay. A strong correlation was found between the prediction of the HSI model analysis and the field observations (r=0.72〜0.80), while model predictions for the artificial construction were low depending on the substrate configuration. Possible causes preventing seaweed beds formation are feeding damage by herbivores inhabiting in the substrate crevasses. By using a net over the artificial constructions where Sargassum spp. had not previously grown, young Sargassum patens sporophytes were able to survive. To form a submarine forest effectively in this area, it was suggested that it is necessary to prevent herbivores from using substrate crevasses as habitats. The feeding experiments verified the feeding activity of a decapod crustacean Heptacarpus futilirostris on young Sargassum patens sporophytes. Although the grazing amount of each crustacean species would be slight, young Sargassum spp. survival might be affected by the grazing of crustaceans including H. futilirostris especially in the area where the seaweed beds have deteriorated and seaweed bed formation has not been successful.
2012-11-15