Seasonal variability of δ13C and δ15N of fish and squid in the Cabo Frio upwelling system of the southwestern Atlantic
Soares, Lucy S. H.
Muto, Elizabeti Y.
Lopez, Juliana P.
Clauzet, Gabriela R. V.
MetadataShow full item record
To determine whether shifts occurred in the food web associated with upwelling at the Brazilian western boundary South Atlantic Central Water (SACW), we measured isotopic composition (δ15N and δ13C) of 38 fish and 3 squid species from the Cabo Frio food web. Sampling was performed during the austral summer upwelling period (February 2002) and the austral winter non-upwelling period (July 2001). Mean lipid-corrected δ13 δ13Ccor) values ranged from -20.17 to -15.02‰, and mean δ15N ranged from 10.28 to 16.08‰. An analysis of covariance performed using length as a covariate provided evidence of seasonal effects on the mean fish δ13Ccor and δ15N, with higher values during the non-upwelling period than during the upwelling period. These effects are most likely related to biophysical processes that occurred 1 to 6 mo earlier. The data furnish circumstantial evidence of a link between the dynamics of the SACW and the trophic structure of Cabo Frio. The trophic level of the species of fish and squids ranged between the theoretical trophic levels of 3.6 and 5.1, but there were no discrete steps, rather a continuous gradient in isotopic values. This suggests that these food webs are unstructured and the component species have mixed diets.
Author Posting. © Inter-Research, 2014. This article is posted here by permission of Inter-Research for personal use, not for redistribution. The definitive version was published in Marine Ecology Progress Series 512 (2014): 9-21, doi:10.3354/meps10948.
Showing items related by title, author, creator and subject.
Gruber, Nicolas; Frenzel, Hartmut; Doney, Scott C.; Marchesiello, Patrick; McWilliams, James C.; Moisan, John R.; Oram, John J.; Plattner, Gian-Kasper; Stolzenbach, Keith D. (2006-06-13)We study the dynamics of the planktonic ecosystem in the coastal upwelling zone within the California Current System using a three-dimensional, eddy-resolving circulation model coupled to an ecosystem/biogeochemistry ...
Trophic structure of benthic communities in the Cabo Frio upwelling system (southeastern Brazilian shelf) : a temporal study using stable isotope analysis Corbisier, Thais N.; Petti, Monica A. V.; Soares, Lucy S. H.; Muto, Elizabeti Y.; Bromberg, Sandra; Valiela, Ivan (Inter-Research, 2014-10-09)In Brazil, coastal upwelling is observed in 7 areas along the southeastern/southern region and is most pronounced near Cabo Frio, Rio de Janeiro. This region is exposed to moderate seasonal Ekman-driven upwelling that ...
Loose, Brice; Jenkins, William J.; Moriarty, Roisin; Brown, Peter; Jullion, Loic; Naveira Garabato, Alberto C.; Valdes, Sinhue Torres; Hoppema, Mario; Ballentine, Chris; Meredith, Michael P. (John Wiley & Sons, 2016-08-18)The distribution of noble gases and helium isotopes in the dense shelf waters of Antarctica reflects the boundary conditions near the ocean surface: air-sea exchange, sea ice formation, and subsurface ice melt. We use a ...