• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文OA文献 >Interactions between pH and nutrients on benthic algae in streams and consequences for ecological status assessment and species richness patterns
【2h】

Interactions between pH and nutrients on benthic algae in streams and consequences for ecological status assessment and species richness patterns

机译：pH和营养物质在底栖藻类中的相互作用以及对生态状况评估和物种丰富度模式的影响

代理获取
本网站仅为用户提供外文OA文献查询和代理获取服务，本网站没有原文。下单后我们将采用程序或人工为您竭诚获取高质量的原文，但由于OA文献来源多样且变更频繁，仍可能出现获取不到、文献不完整或与标题不符等情况，如果获取不到我们将提供退款服务。请知悉。
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Eutrophication and acidification are among the major stressors on freshwater ecosystems in northern Europe and North America, but possible consequences of interactions between pH and nutrients on ecological status assessment and species richness patterns have not previously been assessed. Using data from 52 river sites throughout Norway, we investigated the combined effects of pH and nutrients on benthic algae assemblages, specifically 1) taxa-specific couplings between nutrient and acidity traits, 2) the degree of consistency between different biotic indices, separately for nutrients and acid conditions, 3) the impact of pH on nutrient indices and phosphorus on indices of acid conditions, and 4) the impact of pH and phosphorus supply on diatom and non-diatom taxon richness. We found that 1) acid-tolerant taxa are generally associated with nutrient-poor conditions, with only a few exceptions; this is probably more a consequence of habitat availability than reflecting true ecological niches; 2) correlation coefficients between nutrient indices and TP, as well as acid conditions indices and pH were barely affected when the confounding factor was removed; 3) the association of acid-tolerant taxa with nutrient-poor conditions means that the lowest possible nutrient index at a site, as indicated by benthic algae, is lower at acid than at circumneutral sites. Although this may be an artifact of the datasets from which taxa-specific indicator values were derived, it could lead to a drift in nutrient indices with recovery from acidification; 4) the response of non-diatom taxon richness follows a complex pattern with a synergistic interaction between nutrient supply and pH. In contrast, diatom richness follows a simple additive pattern; this suggests structural differences between diatoms and non-diatom benthic algae in their response to nutrient supply and pH; diatom taxon richness tended to increase with nutrient supply, while non-diatom richness decreased. (C) 2012 Elsevier B.V. All rights reserved.
机译：富营养化和酸化是北欧和北美淡水生态系统的主要压力源，但先前尚未评估pH和营养素之间相互作用对生态状况评估和物种丰富度模式的可能后果。利用来自挪威52个河流站点的数据，我们研究了pH和营养物对底栖藻类组合的综合影响，特别是1）营养物和酸度特征之间的分类群特异性耦合，2）不同生物指数之间的一致性程度，分别针对营养物和酸性条件； 3）pH对营养指标和磷的影响对酸性条件的影响，以及4）pH和磷的供应对硅藻和非硅藻类群丰富度的影响。我们发现1）耐酸类群通常与营养不良条件相关，只有少数例外；这可能是栖息地可利用性的结果，而不是反映真正的生态位； 2）去除混杂因素后，营养指数与总磷之间的相关系数以及酸性条件指数与pH值几乎没有受到影响； 3）耐酸类群与缺乏营养的条件相关联，这意味着底栖藻类在某个地点的最低可能营养指数在酸性处比在中性地点低。尽管这可能是从中导出特定生物分类指标值的数据集的人工产物，但是随着酸化的恢复，它可能导致营养指数的漂移； 4）非硅藻类群丰富度的响应遵循一种复杂的模式，在养分供应和pH值之间具有协同作用。相反，硅藻的富集遵循简单的累加模式。这表明硅藻和非硅藻底栖藻类在对养分供应和pH的响应方面存在结构差异；硅藻类群丰富度随养分供应而增加，而非硅藻类丰富度则下降。 （C）2012 Elsevier B.V.保留所有权利。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
代理获取

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