El significado paleoceanográfico de los morfogrupos de foraminíferos bentónicos en la zona de Pisco

Dennis Romero; Federico Velazco; Dimitri Gutiérrez

doi:10.53554/boletin.v40i1.403

Authors

Dennis Romero Instituto del Mar del Perú, Dirección General de Investigaciones Oceanográficas y Cambio Climático, Callao, Perú. https://orcid.org/0000-0002-8222-5574
Federico Velazco Instituto del Mar del Perú, Dirección General de Investigaciones Oceanográficas y Cambio Climático, Callao, Perú. https://orcid.org/0000-0003-4884-2728
Dimitri Gutiérrez Instituto del Mar del Perú, Dirección General de Investigaciones Oceanográficas y Cambio Climático, Callao, Perú. https://orcid.org/0000-0001-5443-6924

DOI:

https://doi.org/10.53554/boletin.v40i1.403

Keywords:

Calcareous foraminifera, microfossils, Pisco, continental slope

Abstract

The analysis of benthic foraminiferal morphogroups was performed on a laminated sediment sequence (B1404-11) spanning the last 300 years. The core was retrieved from the continental slope (302 m depth) northwest of Independencia Bay, Pisco (14°7.755S, 76°30.253W), within the influence of the Oxygen Minimum Zone (OMZ). Morphogroups with flattened-elongated tests were dominant, significantly outnumbering other forms, including flattened, conical, plano-convex, biconvex, bi-umbilicate, lenticular, and ovoid morphogroups. Hierarchical cluster analysis identified two primary associations based on the contributions of key morphogroups. The first association was characterized by intervals with a higher representation of conical and bi-umbilicate morphogroups, whereas the second association reflected dominance by flattened and plano-convex forms. These findings suggest that the distribution of the predominant morphogroups mirrors the structural
characteristics of the OMZ in this region.

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