...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Aquatic Sciences >Timing, growth and proportion of spawners of the threatened unionoid mussel Margaritifera margaritifera: influence of water temperature, turbidity and mussel density
【24h】

Timing, growth and proportion of spawners of the threatened unionoid mussel Margaritifera margaritifera: influence of water temperature, turbidity and mussel density

机译：受威胁的union类贻贝玛格丽塔玛格丽塔玛的产卵时间，生长和比例：水温，浊度和贻贝密度的影响

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

Anthropogenic disturbances often cause decline and extinction of threatened species. The present study investigated how gravid freshwater mussels, Margaritifera margaritifera, were affected by turbidity and water temperature, and by mussel density. At an early date of mussel spawning, there were lower proportions of gravid mussels in streams with evidence of mussel recruitment than in streams without mussel recruitment. At a late spawning date, this pattern was reversed. Higher water temperature in streams without recruitment was probably responsible for this difference. The combination of high water temperature and turbidity may be one reason for reduced growth of gravid mussels in streams without recruitment. There was a positive relationship between adult mussel density and the proportions of gravid mussels. Early gravidity may lead to early release of larvae, early infestation on the host fish and an earlier start of the benthic phase, which may reduce survival rates. Clear-cutting of forests and global warming are factors that are likely to cause increased turbidity/sedimentation and water temperatures in streams. One restoration measure that reduces sediment input and water temperatures is maintaining or restoring riparian zones, but these are long-term measures that require many years before they have an effect in streams.
机译：人为干扰通常导致受威胁物种的减少和灭绝。本研究调查了浑浊度，水温和贻贝密度如何对妊娠淡水贻贝，玛格丽特酒（Margaritifera margaritifera）产生影响。在贻贝产卵的早期，有贻贝募集迹象的溪流中的贻贝比例要低于没有贻贝募集的溪流。在较晚的产卵日期，这种模式被颠倒了。没有差异的溪流中较高的水温可能是造成这种差异的原因。高水温和浑浊的结合可能是导致淡水贻贝在溪流中生长而减少的原因之一。成年贻贝密度与妊娠贻贝的比例呈正相关。早期妊娠可能导致幼虫早期释放，对寄主鱼的早期侵染和底栖阶段的较早开始，这可能会降低成活率。砍伐森林和全球变暖是可能导致河流浑浊/沉积和水温升高的因素。减少或减少沉积物输入量和水温的一种恢复措施是维持或恢复河岸带，但这是一项长期措施，需要很多年才能对河流产生影响。

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