An environmental magnetism approach to assess impacts of land-derived sediment disturbances on coral reef ecosystems (Cartagena, Colombia)
| Autor: | Jose Duque-Trujillo, Marcos A. E. Chaparro, Juan D. Restrepo, Daniela Mejia-Echeverry |
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| Rok vydání: | 2018 |
| Předmět: |
Geologic Sediments
010504 meteorology & atmospheric sciences Environmental magnetism Colombia Environment 010501 environmental sciences Aquatic Science Geociencias multidisciplinaria Oceanography Ferric Compounds 01 natural sciences Ciencias de la Tierra y relacionadas con el Medio Ambiente Magnetics Rivers Abundance (ecology) MAGDALENA RIVER Dominance (ecology) Ecosystem LAND-BASED SEDIMENTS TRACE ELEMENTS ESTUARINE/MARINE SEDIMENTS 0105 earth and related environmental sciences Islands Minerals geography geography.geographical_feature_category Coral Reefs Sediment Coral reef MAGNETIC PROPERTIES Pollution Ferrosoferric Oxide ENRICHMENT FACTOR Bays Enrichment factor CIENCIAS NATURALES Y EXACTAS Geology Channel (geography) Environmental Monitoring |
| Zdroj: | Marine Pollution Bulletin. 131:441-452 |
| ISSN: | 0025-326X |
| DOI: | 10.1016/j.marpolbul.2018.04.030 |
| Popis: | We used environmental magnetism methods to study recently deposited marine sediments from the estuarine ecosystems on the Caribbean coast of Colombia. Cartagena region has undergone an increasing sediment load during the last decades via sediment plumes from Magdalena River and its distributary man-made channel. Concentration dependent magnetic parameters show an increasing abundance of ferrimagnetic minerals on the uppermost sediments on sites located close to the continent (remanent magnetization SIRM = 5.4-9.5 × 10−3Am2 kg−1) as well as faraway sites (SIRM = 0.5-1.7 × 10−3Am2 kg−1 near Rosario Islands coral reef complex). The magnetic grain size and mineralogy along the cores are variable, showing the dominance of the magnetite-like minerals (remanent coercivity Hcr = 34.3-45.3 mT), with a minor contribution of high-coercivity minerals (Hcr = 472-588 mT). In addition, there is a moderate enrichment of elements Cu, Mo, and Zn (enrichment factor EF = 1.5-3.8) that indicates the additional land-derived contribution on sediments. The environmental magnetism approach, which shows significant signals of magnetic minerals and trace elements, is a reliable tool to prove the presence of continental sediment supply in coral reef ecosystems. Fil: Mejia Echeverry, Daniela. Universidad Eafit; Colombia Fil: Chaparro, Marcos Adrián Eduardo. Universidad Nacional del Centro de la Provincia de Buenos Aires. Centro de Investigaciones en Física e Ingeniería del Centro de la Provincia de Buenos Aires. - Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Tandil. Centro de Investigaciones en Física e Ingeniería del Centro de la Provincia de Buenos Aires. - Provincia de Buenos Aires. Gobernación. Comisión de Investigaciones Científicas. Centro de Investigaciones en Física e Ingeniería del Centro de la Provincia de Buenos Aires; Argentina Fil: Duque Trujillo, Jose Fernando. Universidad Eafit; Colombia Fil: Restrepo, Juan D.. Universidad Eafit; Colombia |
| Databáze: | OpenAIRE |
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