Rising from the ashes: Changes in salmonid fish assemblages after 30 months of the Puyehue-Cordon Caulle volcanic eruption
| Autor: | Todd A. Crowl, Patricio J. Macchi, Magalí Rechencq, Santiago Martín Juárez, Matthew E. Baker, Nicolaas Bouwes, Mailén Elizabeth Lallement, Pablo H. Vigliano |
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| Jazyk: | angličtina |
| Rok vydání: | 2016 |
| Předmět: |
0106 biological sciences
Environmental Engineering Otras Ciencias Biológicas STREAMS Volcanic Eruptions 010603 evolutionary biology 01 natural sciences Ciencias Biológicas Rivers Environmental Chemistry Animals FISH ASSEMBLAGES Chile DISTURBANCE Waste Management and Disposal Ecosystem Riparian zone Hydrology geography geography.geographical_feature_category Vulcanian eruption MACROINVERTEBRATES VOLCANIC ERUPTION 010604 marine biology & hydrobiology Westerlies Pollution Habitat destruction Volcano ASHES Benthic zone Physical geography Rift zone Geology Salmonidae CIENCIAS NATURALES Y EXACTAS Environmental Monitoring |
| Popis: | Events such as volcanic eruptions may act as disturbance agents modifying the landscape spatial diversity and increasing environmental instability. On June 4, 2011 the Puyehue-Cordon Caulle volcanic complex located on Chile (2236 m.a.s.l., 40° 02' 24? S- 70° 14' 26? W) experience a rift zone eruption ejecting during the first day 950 million metric tons into the atmosphere. Due to the westerly winds predominance, ash fell differentially upon 24 million ha of Patagonia Argentinean, been thicker deposits accumulated towards the West. In order to analyze changes on stream fish assemblages we studied seven streams 8, 19 and 30 months after the eruption along the ash deposition gradient, and compare those data to pre eruption ones. Habitat features and structure of the benthic macroinvertebrate food base of fish was studied. After the eruption, substantial environmental changes were observed in association with the large amount of ash fallout. In western sites, habitat loss due to ash accumulation, changes in the riparian zone and morphology of the main channels were observed. Turbidity was the water quality variable which reflected the most changes throughout time, with NTU values decreasing sharply from West to East sites. In west sites, increased Chironomid densities were recorded 8 months after the initial eruption aswell as lowEPT index values. These relationships were reversed in the less affected streams farther away from the volcano. Fish assemblages were greatly influenced both by habitat and macroinvertebrate changes. The eruption brought about an initial sharp decline in fish densities and the almost total loss of young of the year in themostwestern streams affecting recruitment. This effect diminished rapidly with distance fromthe emission center. Thirty months after the eruption, environmental changes are still occurring as a consequence of basin wide ash remobilization and transport. Fil: Lallement, Mailén Elizabeth. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Universidad Nacional del Comahue. Centro Regional Universitario Bariloche; Argentina Fil: Macchi, Patricio Jorge. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Universidad Nacional del Comahue. Centro Regional Universitario Bariloche; Argentina Fil: Vigliano, Pablo Horacio. Universidad Nacional del Comahue. Centro Regional Universitario Bariloche; Argentina Fil: Juárez, Santiago Martín. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Universidad Nacional del Comahue. Centro Regional Universitario Bariloche; Argentina Fil: Rechencq, Magali. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Universidad Nacional del Comahue. Centro Regional Universitario Bariloche; Argentina Fil: Baker, Matthew. University of Maryland Baltimore County; Estados Unidos Fil: Bouwes, Nicolaas. Eco Logical Research; Estados Unidos Fil: Crowl, Todd. State University of Utah; Estados Unidos |
| Databáze: | OpenAIRE |
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