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    Fluctuations in export productivity over the last century from sediments of a southern Chilean fjord (44°S)

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    Sepulveda et al (2005).pdf (589.8Kb)
    Date
    2005-07-08
    Author
    Sepulveda, Julio  Concept link
    Pantoja, Silvio  Concept link
    Hughen, Konrad A.  Concept link
    Lange, Carina B.  Concept link
    Gonzalez, Fidelina  Concept link
    Munoz, Praxedes  Concept link
    Rebolledo, Lorena  Concept link
    Castro, Rodrigo  Concept link
    Contreras, Sergio  Concept link
    Avila, Alejandro  Concept link
    Rossel, Pamela  Concept link
    Lorca, Gisella  Concept link
    Salamanca, Marco  Concept link
    Silva, Nelson  Concept link
    Metadata
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    Citable URI
    https://hdl.handle.net/1912/397
    As published
    https://doi.org/10.1016/j.ecss.2005.07.005
    Keyword
     Paleoproductivity; Organic matter; Fjords; Chile 
    Abstract
    Here we present the first reconstruction of changes in surface primary production during the last century from the Puyuhuapi fjord in southern Chile, using a variety of parameters (diatoms, biogenic silica, total organic carbon, chlorins, and proteins) as productivity proxies. Two sediment cores from the head and the center of the fjord were analyzed and compared to gain insights on past changes in productivity in these two different depositional environments. Higher sedimentation rates found at the head of the fjord result from the combination of a shallower water column and a restricted circulation by the occurrence of a sill. Additionally, sediment mixing depths estimated from 210Pb data suggest that suboxic conditions may dominate the bottom water and the sediment-water interface in this location. Productivity of the Puyuhuapi fjord during the last century was characterized by a constant increase from the late 19th century to the early 1980s, then decreased until the late-1990s, and then rose again to present-day values. The influence of rainfall on productivity was most noticeable during periods of low rainfall, which coincided with decreased overall productivity within the Puyuhuapi fjord. Simultaneous variations in productivity and rainfall in the study area suggest that marine productivity could respond to atmospheric-oceanic interactions at a local scale. At a regional scale, marine productivity of the area may be related to other large-scale processes such as the El Niño Southern Oscillation.
    Description
    Author Posting. © The Authors, 2005. This is the author's version of the work. It is posted here by permission of Elsevier B. V. for personal use, not for redistribution. The definitive version was published in Estuarine, Coastal and Shelf Science 65 (2005): 587-600, doi:10.1016/j.ecss.2005.07.005.
    Collections
    • Marine Chemistry and Geochemistry (MC&G)
    Suggested Citation
    Preprint: Sepulveda, Julio, Pantoja, Silvio, Hughen, Konrad A., Lange, Carina B., Gonzalez, Fidelina, Munoz, Praxedes, Rebolledo, Lorena, Castro, Rodrigo, Contreras, Sergio, Avila, Alejandro, Rossel, Pamela, Lorca, Gisella, Salamanca, Marco, Silva, Nelson, "Fluctuations in export productivity over the last century from sediments of a southern Chilean fjord (44°S)", 2005-07-08, https://doi.org/10.1016/j.ecss.2005.07.005, https://hdl.handle.net/1912/397
     

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