51. Citizen scientists document long-term streamflow declines in intermittent rivers of the desert southwest, USA
- Author
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Daniel C. Allen, Dale S. Turner, Timothy J. Flood, Gita S. Bodner, Katie H. Costigan, Darin A. Kopp, Thibault Datry, Bernard Hugueny, Department of Biology, Ecology and Evolutionary Biology Graduate Program, University of Oklahoma (OU)-University of Oklahoma (OU), School of Geosciences, University of Louisiana, Milieux aquatiques, écologie et pollutions (UR MALY), Institut national de recherche en sciences et technologies pour l'environnement et l'agriculture (IRSTEA), Evolution et Diversité Biologique (EDB), Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées, The Nature Conservancy, Friends of the Agua Fria National Monument, National Science Foundation (NSF)NSF DEB-1754389, Université Toulouse III - Paul Sabatier (UT3), and Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Institut de Recherche pour le Développement (IRD)-Centre National de la Recherche Scientifique (CNRS)
- Subjects
010504 meteorology & atmospheric sciences ,0208 environmental biotechnology ,Climate change ,02 engineering and technology ,drought ,Aquatic Science ,01 natural sciences ,Streamflow ,citizen science ,Citizen science ,intermittent river ,14. Life underwater ,skin and connective tissue diseases ,Ecology, Evolution, Behavior and Systematics ,0105 earth and related environmental sciences ,fish ,Desert (philosophy) ,Ecology ,[SDV.BA]Life Sciences [q-bio]/Animal biology ,15. Life on land ,6. Clean water ,020801 environmental engineering ,Term (time) ,Fishery ,Geography ,river drying ,climate change ,13. Climate action ,habitat connectivity ,%22">Fish ,sense organs ,streamflow ,[SDE.BE]Environmental Sciences/Biodiversity and Ecology - Abstract
Intermittent rivers are spatially dynamic, expanding and contracting in response to changes in water availability, but studies that explicitly examine spatial drying patterns are scarce. We used long-term data produced by citizen scientists to map wet and dry reaches of 3 different river systems to investigate mechanisms producing temporal variation in drying patterns. We quantified the total wetted river length in each survey, and calculated ecologically scaled landscape indices that indicate the carrying capacity (population size) and habitat connectivity of large and small fish metapopulations in these systems. We found that the spatial extent of perennial water decreased over the study period in 2 of the 3 study rivers: similar to 26% in the Agua Fria River from 2008 to 2016, and similar to 14% in Cienega Creek from 2006 to 2016. We also observed an similar to 8% decline in habitat connectivity for large fish in the Agua Fria River. We used multivariate structural equation models to infer causal relationships between spatial drying patterns and temperature, precipitation, streamflow, and drought conditions. These models explained 85% of year-to-year variation in the total length of wet reaches, and 63 and 55% of year-to-year variation in habitat connectivity for large and small fish, respectively. With the US Southwest shifting to an even more arid climate, our results suggest that this may reduce habitat connectivity of fish populations in this region.
- Published
- 2019
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