Open AccessFORAMINÍFEROS BENTÓNICOS RECIENTES EN SEDIMENTOS DE FONDO DE LA CUENCA DE PANAMÁ (PACÍFICO COLOMBIANO), COMO INDICADORES DE PRODUCTIVIDAD Y OXIGENACIÓN
Author(s) -
María Julliet Betancur,
Ignacio Martı́nez
Publication year - 2016
Publication title -
boletin de investigaciones marinas y costeras/boletín de investigaciones marinas y costeras
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.177
H-Index - 14
eISSN - 2590-4671
pISSN - 0122-9761
DOI - 10.25268/bimc.invemar.2003.32.0.262
Subject(s) - terrigenous sediment , upwelling , photic zone , geology , seafloor spreading , oceanography , panama , foraminifera , structural basin , flux (metallurgy) , total organic carbon , geomorphology , chemistry , phytoplankton , benthic zone , organic chemistry , nutrient , environmental chemistry , biology , ecology
Thirteen deep-sea samples (core-tops) from the Panama Basin, Colombian Pacific, were analysed for benthonic foraminifera in the >150μm size fraction. Based on the microfaunal content, three zones are recognised in the Panama Basin: (1) northern euphrophic region (~8º to 5,5ºN), characterized by a high concentration of organic matter flux to the seafloor, oxygenated sediments, and influence of the Panama Bight and the Costa Rica Dome upwelling systems, (2) mesotrophic region (~5,5 to 2ºN), characterized by low fluxes of organic carbon to the seafloor, oxygenated sediments, terrigenous influence and fluctuations of the upwelling systems of the basin, and (3) southern euphotic region (south of ~2ºN), characterized by a larger organic carbon flux to the seafloor, low oxygen content (disoxia) and influence of the Equatorial Divergence.