A test of biological trait analysis with nematodes and an anthropogenic stressor

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• 作者：Hanan M. Mitwally ; John W. Fleeger
• 关键词：Functional groups ; Salt marsh ; Nutrient enrichment ; Environmental monitoring
• 刊名：Environmental Monitoring and Assessment
• 出版年：2016
• 出版时间：March 2016
• 年：2016
• 卷：188
• 期：3
• 全文大小：1,446 KB
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• 作者单位：Hanan M. Mitwally (1) (2)
  John W. Fleeger (1)
  
  1. Department of Biological Sciences, Louisiana State University, Baton Rouge, LA, 70803, USA
  2. Oceanography Department, Faculty of Science, University of Alexandria, Moharem Bey, 21151, Alexandria, Egypt
  
• 刊物类别：Earth and Environmental Science
• 刊物主题：Environment
  Monitoring, Environmental Analysis and Environmental Ecotoxicology
  Ecology
  Atmospheric Protection, Air Quality Control and Air Pollution
  Environmental Management
  
• 出版者：Springer Netherlands
• ISSN：1573-2959

文摘

Aquatic ecosystems are fundamentally altered by nutrient enrichment, and effective monitoring tools are needed to detect biological responses especially in the early stages of eutrophication. We tested the utility of biological trait analysis (BTA) to quantify the temporal responses of nematodes inhabiting salt marsh creeks that were experimentally enriched with nutrients for 6 years. Feeding, body shape, and tail shape traits were characterized on >6000 nematodes from annual samples from enriched and non-enriched sites. Here, we ask if trait combinations are more effective than single traits in detecting the magnitude and rate of change. We also sought to identify combinations of traits that best distinguish natural from nutrient-induced variation. BTA revealed that feeding, body shape, and all traits combined equally detected the response to nutrient enrichment. Compared to single traits however, BTAs were more sensitive to temporal trends and better distinguished natural variation from the response to nutrient enrichment. Tail shape traits (that might respond to altered sediment texture or geochemistry) were not affected by enrichment, and feeding traits yielded the greatest difference between enriched and reference communities indicating that changes in food resources drove responses. Feeding traits provided the highest quality information content in our study, and the use of feeding traits alone may adequately identify anthropogenic effects in many studies. However, we caution that body shape, tail shape, and feeding traits were strongly interrelated at our study site, and a diversity of trait groups may increase the information content of BTAs in more diverse habitats. Keywords Functional groups Salt marsh Nutrient enrichment Environmental monitoring