title: 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).
authors.affiliation: Instituto Tecnológico de Mazatlán, Calle Corsario 1, No. 203, Col. Urías, Mazatlán 82070, Sinaloa, Mexico. Electronic address: ruelas@ola.icmyl.unam.mx.
authors.forename: J
authors.initials: J
authors.lastname: Ruelas-Inzunza
authors.affiliation: Universidad Nacional Autónoma de México/Instituto de Ciencias del Mar y Limnología, Explanada de la Azada s/n, Mazatlán 82040, Sinaloa, Mexico.
authors.forename: M F
authors.initials: MF
authors.lastname: Soto-Jiménez
authors.affiliation: Universidad Nacional Autónoma de México/Instituto de Ciencias del Mar y Limnología, Explanada de la Azada s/n, Mazatlán 82040, Sinaloa, Mexico.
authors.forename: A C
authors.initials: AC
authors.lastname: Ruiz-Fernández
authors.affiliation: Instituto Tecnológico de Mazatlán, Calle Corsario 1, No. 203, Col. Urías, Mazatlán 82070, Sinaloa, Mexico; Universidad Nacional Autónoma de México/Instituto de Ciencias del Mar y Limnología, Explanada de la Azada s/n, Mazatlán 82040, Sinaloa, Mexico.
authors.forename: M
authors.initials: M
authors.lastname: Ramos-Osuna
authors.affiliation: Instituto Tecnológico de Mazatlán, Calle Corsario 1, No. 203, Col. Urías, Mazatlán 82070, Sinaloa, Mexico.
authors.forename: J
authors.initials: J
authors.lastname: Mones-Saucedo
authors.affiliation: Universidad Nacional Autónoma de México/Instituto de Ciencias del Mar y Limnología, Explanada de la Azada s/n, Mazatlán 82040, Sinaloa, Mexico.
authors.forename: F
authors.initials: F
authors.lastname: Páez-Osuna
mesh_terms: D000818:Animals; D002104:Cadmium / Q000737:chemistry*; D020387:Food Chain; D007854:Lead / Q000737:chemistry*; D008099:Liver / Q000737:chemistry / Q000378:metabolism; D018482:Muscle, Skeletal / Q000737:chemistry / Q000378:metabolism; D010140:Pacific Ocean; D011059:Polonium / Q000737:chemistry* / Q000378:metabolism; D014413:Tuna / Q000378:metabolism*; D014874:Water Pollutants, Chemical / Q000737:chemistry*
chemical_list: D014874:Water Pollutants, Chemical; D002104:Cadmium; D007854:Lead; D011059:Polonium
keywords: (210)Po; Cd; Eastern Pacific; Katsuwonus pelamis; Pb; Thunnus albacares