EVALUACIÓN DEL MEJOR CONJUNTO DE DATOS PARA EL ANÁLISIS ESTADÍSTICO DE LA DISTRIBUCIÓN DE COCOLITOFÓRIDOS EN EL MARGEN CONTINENTAL ARGENTINO
DOI:
https://doi.org/10.5710/PEAPA.04.02.2023.411Palabras clave:
Nanoplancton calcáreo, Metodología de conteo, Análisis de datos, Sedimentos superficiales, Océano Atlántico SudoesteResumen
Se analizó la tanatocenosis de cocolitofóridos en 33 sedimentos superficiales en el Margen Continental Argentino. Emiliania huxleyi, especie actual más ubicua, se encuentra en abundancias relativas superiores al 60% y tiende a ocultar las variaciones de especies menos representadas. El objetivo del estudio es comparar dos métodos de conteo de uso intensivo: incluir y excluir E. huxleyi del conjunto de datos y comparar cuál de ambas metodologías refleja mejor las condiciones oceanográficas. En los dos conjuntos de datos, las abundancias de los taxones se convirtieron en porcentajes y se realizaron Análisis de Conglomerados. El resultado que incluye E. huxleyi revela dos grupos (A y B) separados por una distancia euclidiana de 12,8. El grupo A, restringido a la zona sureste (cerca de las Islas Malvinas), está dominado por Gephyrocapsa muellerae (> 56%). El grupo B, dominado por E. huxleyi (> 93%), se distribuye en dos áreas: suroeste (cerca de Tierra del Fuego) y norte (entre 40 ° S - 47 ° S). El resultado que excluye a E. huxleyi muestra dos grupos (A’ y B’) a una distancia euclidiana de 15,8. El grupo A’ tiene una distribución sur y norte, mientras que el grupo B’ está presente en el norte. Estos dos agrupamientos no pueden explicarse por la relación entre la dominancia de los cocolitofóridos y las condiciones oceanográficas superficiales. Nuestros resultados indican que la inclusión de E. huxleyi es el enfoque más apropiado ya que parece correlacionarse mejor con el régimen oceanográfico conocido en el Margen Continental Argentino.
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