...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Journal of environmental science and health >Combined Effects Of Exposure Time And Copper Toxicity On The Demography Of Moina Macrocopa (crustacea: Cladocera)
【24h】

Combined Effects Of Exposure Time And Copper Toxicity On The Demography Of Moina Macrocopa (crustacea: Cladocera)

机译：暴露时间和铜毒性对Moina Macrocopa（甲壳纲：Cladocera）人口的综合影响

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Cohort life table experiments were conducted on M. macrocopa using copper at three nominal concentrations (as CuSO_4, 0.1, 0.2 and 0.4 mg L~(-1), in addition to controls) for different periods of exposure (3 to 24 h). Age-specific survivorship of M. macrocopa decreased in relation to age of the cohort, concentration and duration of exposure to copper. Age-specific life expectancy curves also decreased with increasing age of the cohort. However, at low copper levels and shorter exposure time, there was an increase in life expectancy when the cohort was about 10 day old. Fecundity (m_x) was nearly regular in controls; however, at higher copper levels and longer duration of exposure, the offspring production was more oscillating. The offspring production completely ceased when continuously exposed to CuSO_4 at 0.4 mg L~(-1). Most of the measured demography variables significantly decreased with increasing concentration of Cu in the medium. The average lifespan and life expectancy at birth varied 2.9 to 9.6 and 2.4 to 9.1 days, respectively. Gross reproductive rate (GRR) varied from 31 to 89 offspring female~(-1) lifespan~(-1), while the survival-weighted net reproductive rates were nearly one-third of the GRR. Generation time of M. macrocopa varied from 5 to 7 days while the rate of population increase ranged from 0.36 to 0.84 per day. The results are discussed in relation to the sensitivity of M. macrocopa to copper toxicity and the necessity of amending the national water quality criteria in Mexico.
机译：在不同的暴露时间（3至24小时）中，使用三种标称浓度的铜（CuSO_4、0.1、0.2和0.4 mg L〜（-1），除对照组外）对铜绿假单胞菌进行了队列寿命表实验。与种群的年龄，浓度和接触铜的持续时间有关，M。macrocopa的特定年龄存活率降低。特定年龄的预期寿命曲线也随着队列年龄的增加而降低。但是，在低铜水平和较短的暴露时间下，当该队列为10天左右时，预期寿命会增加。生殖力（m_x）在对照中几乎是正常的；然而，在较高的铜水平和更长的暴露时间下，后代的生产更加振荡。当连续暴露于0.4 mg L〜（-1）的CuSO_4时，后代的生产完全停止。大多数测量的人口统计学变量会随着介质中Cu浓度的增加而显着降低。出生时的平均寿命和预期寿命分别为2.9至9.6天和2.4至9.1天。总生殖率（GRR）在31至89个后代雌性〜-1寿命〜-1之间变化，而生存加权的净生殖率接近GRR的三分之一。大co的发生时间从5天到7天不等，而人口增长率每天从0.36到0.84不等。对结果进行了讨论，涉及大毛白杨对铜毒性的敏感性以及墨西哥修改国家水质标准的必要性。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号