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皖南上溪群中的虫牙类和疑源类化石及其地质意义 被引量:6
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作者 陈冠宝 尹磊明 徐树桐 《石油与天然气地质》 EI CAS CSCD 北大核心 2001年第2期105-107,共3页
“江南古陆”东北端上溪群中,发现了虫牙类化石和疑源类化石组合,为这套地层的准确定时,提供了直接证据。经鉴定,这一化石及化石组合的时代为寒武-奥陶纪,而不是以往所认为的中元古代。这些化石的发现说明依据岩体同位素年龄确定... “江南古陆”东北端上溪群中,发现了虫牙类化石和疑源类化石组合,为这套地层的准确定时,提供了直接证据。经鉴定,这一化石及化石组合的时代为寒武-奥陶纪,而不是以往所认为的中元古代。这些化石的发现说明依据岩体同位素年龄确定围岩年龄具有不确定性,另外,这一发现对研究该区的构造演化史具有重要意义。 展开更多
关键词 “江南古陆” 虫牙类 疑源 化石 上溪群 皖南地区
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Effects of Calanoid Copepod Schmackeria poplesia as a Live Food on the Growth, Survival and Fatty Acid Composition of Larvae and Juveniles of Japanese Flounder, Paralichthys olivaceus 被引量:3
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作者 LIU Guangxing XU Donghui 《Journal of Ocean University of China》 SCIE CAS 2009年第4期359-365,共7页
Zooplankton constitutes a major part of the diet for fish larvae in the marine food web, and it is generally believed that copepods can meet the nutritional requirements of fish larvae. In this study, calanoid copepod... Zooplankton constitutes a major part of the diet for fish larvae in the marine food web, and it is generally believed that copepods can meet the nutritional requirements of fish larvae. In this study, calanoid copepod Schmackeria poplesia, rotifer Brachionus plicatilis and anostraca crustacean Artemia sp. were analyzed for fatty acid contents, and were used as live food for cul- turing larval Japanese flounder, Paralichthys olivaceus. The total content of three types of HUFAs (DHA, EPA and ARA) in S. po- plesia was significantly higher than that in the other two live foods (P〈O.O1). Three live organisms were used for raising larvae and juveniles of Paralichthys olivaceus respectively for 15 and 10 d. Then the growth, survival and fatty acid composition of the larvae and juveniles were investigated. The results showed that the larvae and juveniles fed with copepods (S. poplesia) had significantly higher growth rate than those fed with the other two organisms (P〈0.01). The survival of the flounder larvae fed with copepods was significantly higher than that of the others (P〈0.01), and the survival of the juvenile fish fed with copepods was higher than that fed with Artemia (P〈0.05). The contents of three types of HUFAs (DHA, EPA and ARA) and the ratio of DHA/EPA in larval and juve- nile flounder P. olivaceus were analyzed. The results showed that the contents of DHA, EPA and ARA in the larvae and juveniles fed with S. poplesia were higher than those fed with a mixed diet orArtemia only, and the ratio of EPA/ARA in larvae and juveniles of P. olivaceus fed with S. poplesia was lower than that in the case of feeding with a mixed diet or Artemia only. The present data showed that copepod is the best choice for feeding the larvae and juveniles of fish considering its effects on the survival, growth and nutrition composition of the fish. 展开更多
关键词 copepod Schmaekeria poplesia Japanese flounder GROWTH HUFA
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