| Summary: | 碩士 === 國立臺灣大學 === 海洋研究所 === 102 === Amphipods are mesograzers using macroalgae as food and habitat. Due to their close associations, the amphipods assemblages may be influenced by the seasonal variations of macroalgal flora. In this study, the macroalgae and associated amphipods at the intertidal zones of Aodi and Longdong in northeastern Taiwan were sampled monthly for 14 months from January 2013 to February 2014. The results showed that Ulva lactuca, U. fasciata, Ulva spp. (=Enteromorpha) and Marginisporum aberrans were the most abundant macroalgal species at both sites, and they had a clear seasonal variation. A total of 8,075 individuals representing 33 amphipod taxa were collected from both sites. The amphipod assemblages were associated with seasonal macroalgal flora at both sites and could be classified into three groups: (1) the winter and spring groups (dominated by Ampithoe sp. 1 and Platorchestia sp. 1); (2) the summer group (Paracorophium sp. 1); (3) the fall group (Paracorophium sp. 1 and other species). The winter and spring groups were mainly associated with the presence of Ulvaceae and they possibly utilized the green algae for food and shelter. The summer and fall groups were mainly associated with M. aberrans. The juveniles and pregnant individuals of Paracorophium sp. 1 appeared throughout the year and they might use all macroalgae as habitats. This study demonstrated that the temporal variation of amphipod assemblages were possibly determined by the interactions between seasonal pattern of macroalgal flora and the life history traits of amphipods
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