Mark D. Munn, Ian Waite, Richard W. Sheibley, Celeste Journey
{"title":"The influence of stream nutrients and habitat on three biological assemblages","authors":"Mark D. Munn, Ian Waite, Richard W. Sheibley, Celeste Journey","doi":"10.1007/s10750-024-05680-6","DOIUrl":null,"url":null,"abstract":"<p>This study determined the relative influence of nutrients and stream habitat on three biological assemblages in five regions of the USA. Nutrient samples were collected over a four-week period, followed by habitat assessment and the collection of biological samples. Biological sampling included diatoms, invertebrates and fish, with three assemblage metrics used for each taxonomic group. We developed boosted regression tree (BRT) models for each biological assemblage metric within each region. Diatom BRT models indicated that nutrients, primarily orthophosphate or total phosphorus, played a larger role than habitat. Nutrients and habitat were approximately equal for invertebrate models with ammonia nitrogen and total organic nitrogen dominant. For fish, habitat had greater importance than nutrients, with total organic nitrogen and total phosphorus the dominant nutrients. Invertebrates had the highest model performance with average CV (cross-validation) <i>R</i><sup>2</sup> at 0.47, with diatoms at 0.31 and fish at 0.26. Strongest individual metrics included low phosphorus diatom taxa, tolerant invertebrate abundance and fish multimetric (fish MMI). These findings suggest that the influence of nutrient species varies regionally and by metric, with the relative importance of nutrients and habitat changing as one moves up the trophic level.</p>","PeriodicalId":13147,"journal":{"name":"Hydrobiologia","volume":"10 1","pages":""},"PeriodicalIF":2.2000,"publicationDate":"2024-08-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Hydrobiologia","FirstCategoryId":"99","ListUrlMain":"https://doi.org/10.1007/s10750-024-05680-6","RegionNum":3,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"MARINE & FRESHWATER BIOLOGY","Score":null,"Total":0}
引用次数: 0
Abstract
This study determined the relative influence of nutrients and stream habitat on three biological assemblages in five regions of the USA. Nutrient samples were collected over a four-week period, followed by habitat assessment and the collection of biological samples. Biological sampling included diatoms, invertebrates and fish, with three assemblage metrics used for each taxonomic group. We developed boosted regression tree (BRT) models for each biological assemblage metric within each region. Diatom BRT models indicated that nutrients, primarily orthophosphate or total phosphorus, played a larger role than habitat. Nutrients and habitat were approximately equal for invertebrate models with ammonia nitrogen and total organic nitrogen dominant. For fish, habitat had greater importance than nutrients, with total organic nitrogen and total phosphorus the dominant nutrients. Invertebrates had the highest model performance with average CV (cross-validation) R2 at 0.47, with diatoms at 0.31 and fish at 0.26. Strongest individual metrics included low phosphorus diatom taxa, tolerant invertebrate abundance and fish multimetric (fish MMI). These findings suggest that the influence of nutrient species varies regionally and by metric, with the relative importance of nutrients and habitat changing as one moves up the trophic level.
期刊介绍:
Hydrobiologia publishes original research, reviews and opinions regarding the biology of all aquatic environments, including the impact of human activities. We welcome molecular-, organism-, community- and ecosystem-level studies in contributions dealing with limnology and oceanography, including systematics and aquatic ecology. Hypothesis-driven experimental research is preferred, but also theoretical papers or articles with large descriptive content will be considered, provided they are made relevant to a broad hydrobiological audience. Applied aspects will be considered if firmly embedded in an ecological context.