Land use impacts on stream community composition and concordance along a natural stress gradient |
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| Institution: | 1. Department of Ecology, University of Oulu, P.O. Box 3000, FI-90014, Finland;2. Thule Institute, University of Oulu, P.O. Box 7300, FI-90014, Finland;3. Finnish Environment Institute, Freshwater Centre, University of Oulu, P.O. Box 413, FI-90014, Finland;4. Pöyry Finland Oy, Oulu Office, Tutkijantie 2, FI-90590 Oulu, Finland;5. Geological Survey of Finland, P.O. Box 1237, FI-70211 Kuopio, Finland;6. Ruuhikoskenkatu 17 B 5, FI-24240 Salo, Finland;7. Finnish Environment Institute, Natural Environment Centre, P.O. Box 140, FI-00251 Helsinki, Finland;1. MARE - Marine and Environmental Sciences Centre, Faculdade de Ciências, Universidade de Lisboa, Campo Grande, 1749-016 Lisboa, Portugal;2. Santa Fe Institute, 1399 Hyde Park Road, Santa Fe, NM 87501, USA;1. Department of Urology, University of Michigan Health System, Ann Arbor, MI;2. Dow Division of Health Services Research, Department of Urology, University of Michigan Health System, Ann Arbor, MI;3. Comprehensive Cancer Center, University of Michigan Health System, Ann Arbor, MI;4. Center for Clinical Management Research, Veterans Affairs (VA) Health Services Research & Development Service, VA Ann Arbor Healthcare System, Ann Arbor, MI;1. The Key Laboratory of Biomedical Information Engineering, Ministry of Education, School of Life Science and Technology, Xi’an Jiaotong University, Xi’an 710049, China;2. College of Life Science, Northwest Normal University, Lanzhou 730070, China |
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| Abstract: | Most ecosystems are subjected to multiple stressors derived from natural and anthropogenic sources and community responses to human disturbance in naturally stressful habitats may differ from those in more benign habitats. We examined the influence of a natural (geology-driven acidity) vs. human-induced stress (land drainage) and their interaction on the composition and concordance of stream diatom, bryophyte and invertebrate communities. To account for differing drainage impacts in circumneutral (sedimentation) and naturally acid (reduced pH and increased metal concentrations) streams we investigated concordance in three groups of streams: reference (circumneutral and naturally acidic reference), circumneutral (reference and drained) and naturally acidic (reference and drained) streams. We expected diatoms to respond more strongly to anthropogenic acidification and more weakly to sedimentation compared to bryophytes and invertebrates. We expected overall strong concordance among the three taxonomic groups, but especially so in reference streams. All three organism groups had distinct species composition in naturally acidic vs. circumneutral streams. Concordance between communities was overall strong, especially so in the reference streams. All groups responded to drainage disturbance in both types of streams. Invertebrates were slightly less responsive to increased acidification in the naturally acidic streams but were more affected by sedimentation in the circumneutral streams than were the other two groups. The natural stressor affected communities more than the anthropogenic stressors. Naturally stressed communities were affected by an anthropogenic stressor as much as those in more benign habitats, although the additional stressor was similar to the initial stress (further reduction of stream pH). Naturally acid streams may need special concern in bioassessment because models based on circumneutral reference sites will likely produce biased predictions for these streams. |
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| Keywords: | Anthropogenic stress Aquatic bryophytes Benthic invertebrates Diatoms Multiple stressors Natural acidity |
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