| Summary: | 碩士 === 國立中山大學 === 海洋生物科技暨資源學系研究所 === 102 === To understand the epibenthic invertebrate community on the contential
shelf break of southwestern Taiwan, we had sampled along the shelf break from
Yongan to southern Penghu with beam trawl. Sampling was more intensively
around nature gas drill site planed by China Petroleum Corporation. Dominant
species were Cnidaria and Arthropoda in this area. The distribution of
dominant species was different from inshore to offshore. The composition of
dominant species group of offshore area were more homogeneous than that of
inshore area. The abundance of Cnidaria was positively correlated to the
number of species, abundance, diversity, and richness of the sampling site.
Cnidaria appeared mostly on offshore, which including Bellonella sp.,
Epizoanthus ramosus, Actiniaria sp., Tropidocyathus lessonii, Flabellum
distinctum and Flabellum sp.. Furthermore, Parapagurus Diogenes, Actumnus
sp. and Polychae sp.2 showed high co-occurrence with Cnidaria in spatial
distribution. Results of multivariate analysis showed heterogeneity in
community structure among inshore and offshore. Community composition of
offshore can be seperated into 3 subgroups, which were western Penghu
Channel, eastern Penghu Channel, and area around nature gas drill. These
findings revealed a significant influence of environment condition and
topography on the composition of benthic community. The dominant species of
inshore area were Portunus spp. and Parapenaeopsis spp.. The dominant
species of western Penghu Channel were Portunus spp., Metapenaeopsis spp.,
Sepia sp., and Philine sp.. The dominant species of eastern Penghu Channel
were Flabellum spp., T. lessonii, Alcyonacea spp., and E. ramosus. The
dominant species of area around nature gas drill were E. ramosus, Actiniaria
sp., T. lessonii, and Parapagurus Diogenes.
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