講演情報
[AOS26-P15]四国西岸アイゴの動態解析手法の検討
*樋口 富彦1 (1.愛媛大学 大学院農学研究科)
キーワード：
アイゴ、耳石、眼球水晶体
Environmental change is dramatically altering the distribution of marine life, including fish. Water temperature, in particular, is a major factor that strongly influences biodiversity and distribution, and rising water temperatures due to global warming are causing species to expand their distribution poleward. In temperate zones, coral populations are increasing, a phenomenon sometimes referred to as the "tropicalization of the oceans." Seaweed is vulnerable to high water temperatures, and in addition to their decline due to global warming, there have been reports of coastal barrens and the disappearance of seaweed communities due to the expansion of herbivorous species such as rabbitfish. As a result, ecosystems are becoming more coral-centered, with significant impacts on ecosystems and the fishing industry. The decline of abalone, which feed on seaweed, is a particularly serious problem for the fishing industry. However, much remains unknown about the ecology of herbivorous fish, making it difficult to develop effective countermeasures. Where do these fish originate, where do they migrate, where do they overwinter and reproduce? What impact does this have on the distribution of seaweed? These important questions have yet to be fully answered. This study focuses on rabbitfish in the coastal waters of western Shikoku, with the aim of developing a method to comprehensively understand the behavioral ecology of herbivorous fish and clarifying the relationship between the abundance of seaweed beds and fish.
Samples used in this research will be herbivorous fish (rabbitfish) caught using fixed nets, etc. In this presentation, we will integrate field surveys, environmental DNA, otolith and eye lens analysis, and marine environmental data analysis to examine methods for accurately reconstructing the life history and behavioral ecology of herbivorous fish, which have been difficult to understand using any single method.
Samples used in this research will be herbivorous fish (rabbitfish) caught using fixed nets, etc. In this presentation, we will integrate field surveys, environmental DNA, otolith and eye lens analysis, and marine environmental data analysis to examine methods for accurately reconstructing the life history and behavioral ecology of herbivorous fish, which have been difficult to understand using any single method.