Polymorphism in recent ostracods of southwestern Spain: an environmental approach |
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Authors: | Francisco Ruiz Manuel Abad Juan Manuel Muñoz |
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Institution: | a Departamento de Geodinámica y Paleontología, Universidad de Huelva, Avenida de las Fuerzas Armadas, s/n. 21071 Huelva, Spain b Département de Géologie et Océanographie, Université de Bordeaux-I, Avenue des Facultés, 33405 Talence cedex, France c Departamento de Estadística e Investigación Operativa, Facultad de Matemáticas, Universidad de Sevilla, Avenida Reina Mercedes, s/n. Sevilla, Spain |
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Abstract: | The analysis of the surface ornamentation permits us to differentiate two morphotypes in the recent populations of the ostracod Urocythereis oblonga collected in shallow marine sediments of the Huelva littoral (SW Spain). An environmental analysis was made and its abundances were compared with different environmental parameters. Morph 1 (reticulated or “normal”) is almost always dominant, characterizing microenvironments with low salinity water changes, low to moderate energy levels, poorly sorted bottom sediments with high percentages of fine grain sizes (very fine sands, silts and clays) and moderate to high ostracod diversity. Morph 2 (punctuated or “degraded”) is significantly represented (> 10%) in stressing conditions, i.e., moderate salinity fluctuations, moderate to high hydrodynamic levels, low organic matter contents, moderate to well-sorted sediments with high percentages of medium sands and low to very low ostracod diversity. These differences make clear the potential of these microcrustaceans as environmental tracers in these transitional areas. |
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Keywords: | Ostracodes Polymorphism Recent SW Spain |
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