²¹⁰Po, Cd and Pb distribution and biomagnification in the yellowfin tuna Thunnus albacares and skipjack tuna Katsuwonus pelamis from the Eastern Pacific.

Abstract:

:We measured Cd and Pb in the muscle and stomach contents of Thunnus albacares and Katsuwonus pelamis to define the distribution of the elements in the tissues and their degrees of biomagnification. (210)Po was measured in the livers of both species and compared to the results of similar studies. The trophic position of the tuna species was determined by N isotope measurements. The average activity of (210)Po in the liver ranged from 119 to 157 (Bq kg(-1) wet weight) in K. pelamis and T. albacares. The trophic position of T. albacares (4.60) was higher than that of K. pelamis (3.94). The Cd content of the muscle increased significantly with the trophic position of the tuna. δ(13)C in T. albacares and K. pelamis varied, with values of 3.13 and 1.88‰, respectively. The δ(15)N values in yellowfin tuna were higher than in skipjack tuna. The trophic position of T. albacares (4.60 ± 0.67) was therefore more elevated than that of K. pelamis (3.94 ± 1.06). Pb was biomagnified in T. albacares (transfer factor=1.46).

journal_name

Mar Pollut Bull

authors

Ruelas-Inzunza J,Soto-Jiménez MF,Ruiz-Fernández AC,Ramos-Osuna M,Mones-Saucedo J,Páez-Osuna F

doi

10.1016/j.marpolbul.2014.08.006

subject

Has Abstract

pub_date

2014-10-15 00:00:00

pages

98-103

issue

1-2

eissn

0025-326X

issn

1879-3363

pii

S0025-326X(14)00533-5

journal_volume

87

pub_type

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