Fine scale distribution constrains cadmium accumulation rates in two geographical groups of Franciscana dolphin from Argentina
P.S. Polizzi, L.N. Chiodi Boudet, M.B. Romero , P.E. Denuncio, D.H. Rodríguez, M.S. Gerpe. Fine scale distribution constrains cadmium accumulation rates in two geographical groups of Franciscana dolphin from Argentina. Marine Pollution Bulletin. 72 (): 41-46. 2013.
Franciscana dolphin is an endemic cetacean in the southwestern Atlantic Ocean and is classified as Vulnerable
A3d by the International Union for Conservation of Nature. Cadmium accumulation was assessed
in two geographic groups from Argentina; one inhabits the La Plata River estuary, a high anthropogenic
impacted environment, and the other is distributed in marine coastal, with negligible pollution. Despite
the environment, marine dolphins showed an increase of renal Cd concentrations since trophic independence;
while in estuarine dolphins was from 6 years. This is associated with dietary Argentine anchovy
which was absent in the diet of estuarine dolphins, being a trophic vector of cadmium in shelf waters
of Argentina. Cluster analysis also showed high levels of cd in association with the presence of anchovy
in the stomach. The difference in the fine scale distribution of species influences dietary exposure to Cd
and, along with other data, indicates two stocks in Argentina.
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