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104/03/24 14:00 東華大學海洋生物研究所謝泓諺助理教授 演講
演講公告
張貼人：網站管理員 ╱ 公告日期：2015-03-20演 講 公 告
主講人：謝泓諺 助理教授
地點：中央大學科學一館S-325教室
摘要：
講題：Effects of typhoon on hydrographic characteristics and larval fish assemblages in the coastal waters of southwestern Taiwan
主講人：謝泓諺 助理教授
東華大學海洋生物研究所
時間：03月24日（星期二）下午2點
地點：中央大學科學一館S-325教室
摘要：
Larval fish and zooplankton were sampled and hydrographic variables were measured in the waters of southwestern Taiwan during September 2009 (non-typhoon) and September 2012 (post-typhoon Tembin). Data from these collections were used to elucidate the effects of hydrographic dynamics after the typhoon event on species assemblage structure and abundance. The results showed that after the typhoon Tembin, the surface temperature and salinity decreased slightly, but the values of the measured chemical and biological parameters were much greater (except for the chlorophyll a concentration) than those derived from the non-typhoon period due to enriched nutrients from entrainment of river runoff of the Kaoping River. Meanwhile, the abundance of larval fish also increased significantly, but the species composition became less diverse. Multivariate statistical analyses revealed two distinct larval fish assemblages that were closely correlated to sampling cruise. The similarity of larval fish assemblage between the non- and post-typhoon periods was low (34.67%). The top five dominant taxa of larval fish changed from Encrasicholina heteroloba, unidentified Sparidae, Cyclothone spp., Nuchequula nuchalis, and Equulites rivulatus during the non-typhoon period to Engraulis japonicus, Sillago sihama, Pennahia argentata, E. rivulatus, and unidentified Engraulidae during the post-typhoon period. Canonical correspondence analysis revealed that, in the waters of southwestern Taiwan, the horizontal distribution of larval fish in late summer may be explained by the food availability. The magnitude of the enhancement of measured variables changed with sampling periods, suggesting the study area was at an unsteady status after the passage of the typhoon Tembin. The coastal ecosystem became more productive after the typhoon event. However, more research is required to observe such community effect caused by the typhoon.
最後修改時間：2015-03-20 AM 9:56
