...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Freshwater science >Spatiotemporal responses of algal, fungal, and bacterial biofilm communities in Atlantic rivers receiving marine-derived nutrient inputs
【24h】

Spatiotemporal responses of algal, fungal, and bacterial biofilm communities in Atlantic rivers receiving marine-derived nutrient inputs

机译：接受海洋来源养分输入的大西洋河流中藻类，真菌和细菌生物膜群落的时空响应

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

Spawning anadromous fishes can enhance primary and secondary production in streams by providing marine-derived nutrients (MDN), but little is known of their effects on individual biofilm constituents (algae, fungi, and bacteria). To address this issue, we measured spatial and temporal changes in the abundance and composition of biofilm algae, fungi, and bacteria in 6 Atlantic rivers with contrasting influx of MDN. Each river had a natural barrier to anadromous fish migration, which established an upstream control and downstream treatment area, with Atlantic Salmon (Salmo salar), Alewife (Alosa pseudoharengus), Rainbow Smelt (Osmerus mordax), or Sea Lamprey (Petromyzon marinus) as the primary anadromous species. In areas receiving MDN, increases in algal and fungal biomass and bacterial density were maintained throughout the season. Algal communities showed the largest (2-10x) increase in abundance over control sites, and Rainbow Smelt spawning streams had the greatest accrual. The river with Alewife showed the largest (2x) increase in fungal biomass during the spawning period. Changes in bacterial density were greatest (2x increase) in the Rainbow Smelt spawning streams. An increase in spawning density (i.e., nutrient load) supported greater biomass accumulation, but the system appeared to saturate quickly. Biofilm in Rainbow Smelt and Alewife streams were enriched up to 2.5 parts per thousand in delta N-15 during spawning, whereas a 1 parts per thousand enrichment occurred in the Sea Lamprey and Atlantic Salmon streams compared with system baseline values. The degree to which MDN drive productivity and the mechanism of how these nutrients are incorporated to increase productivity and ultimately fish production remain unknown.
机译：通过提供海洋来源的养分（MDN），产卵的无鳍鱼类可以提高河流的初级和次级产量，但鲜为人知的是它们对单个生物膜成分（藻类，真菌和细菌）的影响。为了解决这个问题，我们测量了6条大西洋河流中MDN的流入量对比，生物膜藻类，真菌和细菌的丰度和组成的时空变化。每条河流都对天然鱼类的迁移形成天然屏障，从而建立了上游控制区和下游处理区，大西洋鲑（Salmo salar），Alewife（Alosa pseudoharengus），Rainbow Smelt（Osmerus mordax）或Sea Lamprey（Petromyzon marinus）主要的食虫种类。在接受MDN的地区，整个季节藻类和真菌生物量和细菌密度均保持增加。与控制地点相比，藻类群落的丰度增加幅度最大（2-10倍），而彩虹熔炼的产卵流产生的收益最大。产卵期间，带有Alewife的河流显示出最大的（2x）真菌生物量增加。 Rainbow Smelt产卵流中细菌密度的变化最大（增加了2倍）。产卵密度的增加（即养分负荷）增加了生物量的积累，但系统似乎很快饱和了。在产卵期间，彩虹熔炼和Alewife流中的生物膜富集量高达每千份2.5份N-15，而与系统基线值相比，南兰伯利和大西洋鲑鱼流中的生物膜发生了千分之一的富集。 MDN推动生产力的程度以及如何结合这些营养素以提高生产力并最终提高鱼类产量的机制仍然未知。

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