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2022/04/26 14:00 Prof. Meng-Hsien Chen（Department of Oceanography, NSYSU）
Seminar
Poster： ╱ Post date：2022-04-22NCU IHOS Seminar Announcement
Speaker：Prof. Meng-Hsien Chen
Place：S-325, Science Building 1
Abstract：
Title：Spatiotemporal distribution of benthic shrimp assemblages in the western coastal waters off Western Pacific Ocean
Speaker：Prof. Meng-Hsien Chen
Department of Oceanography, NSYSU
Time：04/26（Tue.）14：00
Place：S-325, Science Building 1
Abstract：
Two OR3 research vessel cruises were conducted at seven sites set along the western coastal waters off Taiwan in May (late spring) and November (late autumn) 2019, to elucidate that the benthic shrimp assemblages vary seasonally and geographically. Totally, 27 shrimp species were recorded. The species number was higher in late autumn (20 species) than in late spring (15 species). This difference is due to the appearance of several oligothermal shrimps in the late autumn, compared with only polythermal tropical shrimps found in late spring. Two shrimp assemblages, the northern and southern groups, were identified in the nearshore coastal waters off western Taiwan with distinct dominant shrimp species. Their spatiotemporal distribution reflects the large-scale seasonal water temperature variation driven by the cold China Coastal Current (CCC), and the warm Kuroshio Branch Current (KBC) and South China Sea Surface Current (SCSSC), as well as the shrimp preference for sediment grain size. The northern shrimp assemblage is situated north of Chiku (Qigu) (23˚09’N), which is the cold CCC southbound limit in winter, and is composed mainly of subtropical shrimps, dominated by Parapenaeopsis hardwickii and P. sinica. The southern shrimp assemblage is located south of Jiading (Qieding)(22˚52’N), which is annually affected by the warm KBC and SCSSC, heating the water temperature to > 25℃, even in winter, except for January. This group is composed of mainly tropical shrimps dominated by M. palmensis, which cannot live in water temperatures < 25℃. This is the first report of tropical-subtropical shrimp assemblages formed in conjunction with the large-scale variation of the water mass and current-driven sediment grain size on a seasonal and geographical location basis. It is shown that P. hardwickii made a northward retreat of ca. 0.5˚N in the past two decades, and the baseline has been set to study the northrange shift of the tropical shrimps in the future in this location.
Last modification time：2022-04-22 AM 11:57
