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Unformatted text preview: Meiofauna and sedimentary organic matter off Central Chile: response to changes caused by the 1997-1998 El Nino. Carlos Neira, Javier Sellanes, Aldo Soto, Dimitri Gutierrez, Victor Gallardo This study was conducted off the west coast of central Chile from May of 1997 to May 1998 (May 1997 was defined as “El Nino conditions” while May 1998 was defined as “non-El Nino conditions”). Sampling locations were located from an inner bay to the outer continental shelf (figure 1). This area is subjected to seasonal and yearly variability in upwelling and also feels the effects of the El Nino Southern Oscillation (ENSO). In non-El Nino conditions, dissolved oxygen at the sea water interface is low and some areas even experience anoxic conditions. This is attributed to the increased upwelling during this time and the resulting increase in primary production in the surface water and delivery of organic matter to the bottom. Another interesting change that occurs in non-El Nino years is the seasonal development of a certain kind of bacteria ( Thioploca ). This species of bacteria has been shown to remove toxic sulfide in the sediments and may enhance conditions for aerobic organisms. Thioploca also forms dense mats with many small channels and cavities that may provide microhabitats for...
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This note was uploaded on 04/13/2008 for the course MSCI 479 taught by Professor Koepfler during the Spring '08 term at Coastal Carolina University.
- Spring '08