Ocean Science
Ocean Science
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Articles | Volume 14, issue 5
Articles | Volume 14, issue 5
https://doi.org/10.5194/os-14-1185-2018
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/os-14-1185-2018
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.
Articles | Volume 14, issue 5
Research article
 | 
09 Oct 2018
Research article |  | 09 Oct 2018

Turbulence and hypoxia contribute to dense biological scattering layers in a Patagonian fjord system

Iván Pérez-Santos, Leonardo Castro, Lauren Ross, Edwin Niklitschek, Nicolás Mayorga, Luis Cubillos, Mariano Gutierrez, Eduardo Escalona, Manuel Castillo, Nicolás Alegría, and Giovanni Daneri

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Short summary
Fjord systems play an important role in primary production and carbon export. Acoustic, hydrographic and in situ abundance measurements were used to study macrozooplankton assemblages at 44.7° S. Diel vertical migration of zooplankton stopped at the hypoxic boundary layer and apparently did not tolerate the hypoxic conditions. Turbulence appears to be the oceanographic process that contributes to vertical mixing around the sill, helping the interchange of nutrients, feeding and carbon export.
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