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亚热带浅水湖泊中两种裸腹溞生活史特征的比较

张菲云,王梓燕,李军,曹雅芹,戚惠颖,孙雨琛,张婷婷,邓道贵*   

  1. (淮北师范大学生命科学学院, 安徽淮北 235000)
  • 发布日期:2020-05-10

Comparison on life history traits of two Moina species from shallow lakes in subtropical China.

ZHANG Fei-yun, WANG Zi-yan, LI Jun, CAO Ya-qin, QI Hui-ying, SUN Yu-chen, ZHANG Ting-ting, DENG Dao-gui*   

  1. (School of Life Science, Huaibei Normal University, Huaibei 235000, Anhui, China).
  • Published:2020-05-10

摘要: 以来自武汉南湖的远东裸腹溞和江苏太湖的微型裸腹溞为对象,在温度为(25±1) ℃、食物条件为2×105 cells·mL-1斜生栅藻下,研究了两种裸腹溞的体长、成熟时间、存活率、寿命和产幼溞数等生活史参数。结果表明:两种裸腹溞的体长均随着龄数增加呈现递增的趋势;远东裸腹溞的成熟时间(P=0.008)和首次产幼溞时间(P=0.022)均显著小于微型裸腹溞,而其成熟体长(P<0.001)、寿命(P=0.003)和首次产幼溞数(P<0.001)均显著大于微型裸腹溞;远东裸腹溞和微型裸腹溞的内禀增长率分别为0.73和0.49 ind·d-1;Pearson相关性分析显示,远东裸腹溞(r=0.659, P=0.008)和微型裸腹溞(r=0.649,P=0.009)的首次产幼溞数与成熟体长间均呈极显著相关;江苏太湖的微型裸腹溞的成熟时间长,而武汉南湖的远东裸腹溞的生殖能力更强,这可能与两种裸腹溞的遗传结构及它们对环境适应等差异有关。

关键词: 相似性系数, 青檀, 分离频率, 多样性指数

Abstract: The life history parameters (e.g. body length, time to maturation, survival rate, lifespan and the number of offspring) of Moina weismanni from Lake Nanhu in Wuhan (Hubei Province)and Moina micrura from Lake Taihu in Jiangsu Province were examined under 2×105cells·mL-1Scenedesmus obliquus at (25±1) ℃. The results showed that body length of bothMoina species showed an increasing trend with increasing instar number. Time to maturation (P=0.008) and the first reproduction time (P=0.022) of M.weismanni were significantly lower than those of M. micrura, whereas body length at maturity (P<0.001), lifespan (P=0.003) and the number of offsprings at first reproduction (P<0.001) of M.weismanni were significantly higher than those of M. micrura. Innate rate of increase was 0.73 ind·d-1 forM. weismanni and 0.49 ind·d-1 for M. micrura. Results from Pearson correlation analysis showed that there were significant relationships between the number of offspring at first reproduction and body length at maturity for both M.weismanni(r=0.659,P=0.008) and M. micrura (r=0.649, P=0.009). Our results suggested that M. micrura from Lake Taihu had a longer time to maturation, whereas M. weismanni from Lake Nanhu had a stronger reproductive ability, which might be related to differences in their genetic structure and adaptation to environmental factors in two lakes.

Key words: diversity index, Pteroceltis tatarinowii, similarity coefficient., isolation frequency