From June 2003 to June 2004, an investigation on the life cycle, production and trophic basis of dominant species of macrozoobenthos community in a second-order river of the Hanjiang River basin, Hubei, China was card...From June 2003 to June 2004, an investigation on the life cycle, production and trophic basis of dominant species of macrozoobenthos community in a second-order river of the Hanjiang River basin, Hubei, China was carded out. The results showed that the dominant species Leptophlebia sp. and Ephemera sp. appeared to develop two generations per year, and there was a small overlap in the two generations of both species. The pupation of Leptophlebia sp. mainly occurred in autumn and winter, while pupation of Ephemera sp. mainly took place in summer and winter. The standing stocks of the Leptophlebia sp. population and Ephemera sp. population had two peaks in a year. The cohort production and cohort P/B ratio of the Leptophlebia sp. population estimated by size frequency method were 19.018 1 g/m^2.a and 5.7 respectively, while its annual production and P/B ratio were 38.036 2 g/m^2.a and 11.4. The cohort production and cohort P/B ratio of the Ephemera sp. population were 38.015 9 g/m^2.a and 5.9, while its annual production and P/B ratio were 76.031 8 g/m^2.a and 11.8.展开更多
"蜉蝣"不仅指一种短命的昆虫,在英文中更指称一种"日常生活中琐碎而短暂的文档"。印刷蜉蝣是特殊的历史记录物,具有重要的研究价值,并被以档案的形式保存下来。尤其是随着数字技术的流行和普及,印刷蜉蝣得以被大量..."蜉蝣"不仅指一种短命的昆虫,在英文中更指称一种"日常生活中琐碎而短暂的文档"。印刷蜉蝣是特殊的历史记录物,具有重要的研究价值,并被以档案的形式保存下来。尤其是随着数字技术的流行和普及,印刷蜉蝣得以被大量数字化和档案化,相关研究也得以出现了新的趋势,如蜉蝣的数字档案化。美国弗吉尼亚大学的"阴影谷"(The Valley of Shadow)项目和爱尔兰梅努斯大学的"1916—1923年信件"(Letters 1916-1923)项目提供了很好的示例。更进一步,如中国商业广告档案库的案例所证明的,随着数字档案化的普及和新的研究方法的出现,蜉蝣研究中出现了新的研究问题、路径和方法,也由此产生了新的知识。展开更多
文摘From June 2003 to June 2004, an investigation on the life cycle, production and trophic basis of dominant species of macrozoobenthos community in a second-order river of the Hanjiang River basin, Hubei, China was carded out. The results showed that the dominant species Leptophlebia sp. and Ephemera sp. appeared to develop two generations per year, and there was a small overlap in the two generations of both species. The pupation of Leptophlebia sp. mainly occurred in autumn and winter, while pupation of Ephemera sp. mainly took place in summer and winter. The standing stocks of the Leptophlebia sp. population and Ephemera sp. population had two peaks in a year. The cohort production and cohort P/B ratio of the Leptophlebia sp. population estimated by size frequency method were 19.018 1 g/m^2.a and 5.7 respectively, while its annual production and P/B ratio were 38.036 2 g/m^2.a and 11.4. The cohort production and cohort P/B ratio of the Ephemera sp. population were 38.015 9 g/m^2.a and 5.9, while its annual production and P/B ratio were 76.031 8 g/m^2.a and 11.8.
文摘"蜉蝣"不仅指一种短命的昆虫,在英文中更指称一种"日常生活中琐碎而短暂的文档"。印刷蜉蝣是特殊的历史记录物,具有重要的研究价值,并被以档案的形式保存下来。尤其是随着数字技术的流行和普及,印刷蜉蝣得以被大量数字化和档案化,相关研究也得以出现了新的趋势,如蜉蝣的数字档案化。美国弗吉尼亚大学的"阴影谷"(The Valley of Shadow)项目和爱尔兰梅努斯大学的"1916—1923年信件"(Letters 1916-1923)项目提供了很好的示例。更进一步,如中国商业广告档案库的案例所证明的,随着数字档案化的普及和新的研究方法的出现,蜉蝣研究中出现了新的研究问题、路径和方法,也由此产生了新的知识。
