Life history, secondary production and trophic basis of two dominant mayflies in a subtropical stream of China

YAN Yunjun; LI Xiaoyu

摘要

Mayflies constitute a major part of macroinvertebrate biomass and production in lotic ecosystems, and play an important role in material cycle and energy flow. There are more than 250 species of mayflies in rivers and streams of China. In order to learn their ecological functions, an investigation on life cycle,production and trophic basis of dominant species of mayflies in a second-order branch_of Hanjiang River basin,Hubei, China was carried out during June 2003 to June 2004. The results showed that the dominant mayfly species Epeorus sp. and Caenis sp. developed two generations per year; in term of Epeorus sp., pupation mainly occurred in spring and then from late summer to early autumn, while Caenis sp. pupated in spring and autumn. The abundance and biomass of the Epeorus sp. population peaked twice (1 226 ind/m2, 3.142 5g/m2)in April and June. Caenis sp. also had two peaks (307ind/m2, 1.590 g/m2), but in February and June. Cohort production and cohort P/B ratio ofEpeorus sp. were 161.009 g/m2 wet weight and 7.7, respectively, and annual production and P/B ratio were 267.46g/m2.a wet weight and 15.4, respectively; cohort production and P/B ratio of Caenis sp. were 26.7995g/m2 wet weight and 4.7, its annual production and P/B ratio were 53.60g/m2.a wet weight and 9.4, respectively. For Epeorus sp., the proportions contributing to secondary production of the main food types were: amorphous detritus, 33.46%; fungi, 10.83%; vascular plant detritus, 1.80%; diatoms, 53.90%; for Caenis sp., the proportions were 70.79%, 6.90%, 3.52% and 18.77%, respectively.

机译：黄花菜是许多无脊椎动物生态系统中大型无脊椎动物生物量和生产的主要部分，并在物质循环和能量流中发挥重要作用。中国的河流和溪流中有超过250种250。为了了解它们的生态功能，于2003年6月至2004年6月对湖北省汉江流域二阶分支may的生命周期，产量和营养基础进行了调查。结果表明： may类优势种Epeorus sp。和Caenis sp。每年发展两代;就Epoeorus sp。而言，化up主要发生在春季，然后是夏末至初秋，而Caenis sp。则是化脓。在春季和秋季化up。 Epeorus sp。的丰度和生物量。人口高峰在4月和6月两次（分别为1226 indd / m2、3.142 5g / m2）。 Caenis sp。也有两个峰值（307ind / m2，1.590 g / m2），但在2月和6月。 Epeorus sp。的同类群生产和同类群P / B比。湿重分别为161.09 g / m2和7.7，年产量和P / B比分别为267.46g / m2.a和15.4。 Caenis sp。的队列生产和P / B比。湿重为26.7995g / m2和4.7，年产量和P / B比为53.60g / m2.a湿重和9.4。对于Epoeorus sp。，主要食品类型的二次生产所占比例为：无定形碎屑，占33.46％;真菌，10.83％;维管植物碎屑，1.80％;硅藻53.90％; Caenis sp。的比例分别为70.79％，6.90％，3.52％和18.77％。

Life history, secondary production and trophic basis of two dominant mayflies in a subtropical stream of China

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