Effects of intermittent stream flow on macroinvertebrate community composition and biological traits in a naturally saline Mediterranean stream |
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| Institution: | 1. Department of Ecology and Evolutionary Biology, School of Biological Sciences, The University of Adelaide, North Terrace, Adelaide 5005, Australia;2. Department of Geography, Environment and Population, Sprigg Geobiology Centre, The University of Adelaide, North Terrace, Adelaide 5005, Australia;3. Department of Environment and Water, Waymouth Street, Adelaide 5000, Australia;1. The Key Laboratory of Aquatic Biodiversity and Conservation, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan 430072, China;2. University of Chinese Academy of Sciences, Beijing 100049, China;3. Freshwater Centre, Finnish Environment Institute, Paavo Havaksen Tie 3, P.O. Box 413, Oulu FI-90014, Finland;4. State Key Laboratory of Eco-hydraulic in Northwest Arid Region of China, Xi’an University of Technology, Xi’an 710048, China;5. Institute of International Rivers and Eco-security, Yunnan University, Kunming 650091, China;1. Centre for Applied Water Science, Institute for Applied Ecology, Faculty of Science and Technology, University of Canberra, Canberra, ACT 2601, Australia;2. Department of Biological, Environmental and Occupational Health, School of Public Health, PO Box LG 13, University of Ghana, Legon, Ghana;3. Biological Sciences, School of Natural Sciences, University of Tasmania, Private Bag 55, Hobart, Tasmania 7001, Australia;4. Department of Planning, Industry and Environment - Water, PO Box 53, Wollongong, NSW 2500, Australia;5. iES Landau - Institute for Environmental Sciences, University of Koblenz-Landau, Fortstrasse 7, Landau 76829, Germany;6. Museum Victoria, GPO Box 666, Melbourne, Victoria 3001, Australia;7. Department for Environment and Water, 81-91 Waymouth St, Adelaide, 5000, Australia;8. Environment Protection Authority, Macleod, Victoria 3085, Australia;1. MARE – Marine and Environmental Sciences Centre, Department of Life Sciences, University of Coimbra, Largo Marquês de Pombal, 3004-517 Coimbra, Portugal;2. Department of Zoology and Physical Anthropology, Faculty of Biology, University of Santiago de Compostela, 15782 Santiago de Compostela A Coruña, Spain;3. Estación de Hidrobioloxia ‘Encoro do con’, Castroagudín, 36617 Vilagarcía de Arousa, Pontevedra, Spain;4. University Lyon 1, UMR 5023 LEHNA, Biodiversité des Ecosystèmes Lotiques, Bât Forel, 69622 Villeurbanne Cedex, France;1. Rayalasheema University, AP, India;2. Department of CSE, JNTUHCEJ, JNT University Hyderabad, Telangana, India;3. Department of CSE, SRKR Engineering College, Bhimavaram, AP, India |
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| Abstract: | As saline streams are geographically widespread in arid and semiarid regions, flow intermittence frequently occurs as another stressor factor apart from salinity. Rambla Salada is a temporary naturally saline stream with an intermittent reach upstream. This stream is an ideal scenario to study the effects of intermittent stream flow on macroinvertebrate community composition and biological traits in a naturally saline Mediterranean stream. This study analysed three sites with different hydrological regimes (one intermittent and two perennials). Flow intermittence exerted low pressure on the macroinvertebrate composition and biological traits which led to the loss of drought-intolerant species and taxa rather than acting as a selective force to promote desiccation-resistant taxa. Macroinvertebrate community at the intermittent site was a subset of the community found in perennial sites, and the presence of flier taxa at this site helped avoid flow cessation. These minor changes have consequences to assess the ecological quality of these saline temporary streams in the context of the Water Framework Directive, given the major differences revealed by some indices between the intermittent and perennial sites as the former obtained lower values due to the presence of few desiccation-intolerant species, which significantly increased the value of those biological indices. |
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| Keywords: | Benthic invertebrate assemblages Flow intermittence Saline stream Salinity Traits |
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