TRACE METALS IN TWO WILD POPULATIONS OF THE SQUALID CALLISTA CLAM (<em>Megapitaria squalida</em>) IN THE SOUTHEASTERN GULF OF CALIFORNIA, MEXICO

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Carlos Humberto Sepúlveda
Andrés Martín Góngora-Gómez
Sandra Álvarez-Pérez
Hervey Rodríguez-González
Norma Patricia Muñoz-Sevilla
Brenda Paulina Villanueva-Fonseca
Juan Antonio Hernández-Sepúlveda
Manuel García-Ulloa Gómez

Resumen

The squalid callista clam (Megapitaria squalida) is a popular raw seafood item for human consumption; however, as a filter feeder, this clam accumulates heavy metals from natural and anthropogenic sources. The concentrations of copper (Cu), cadmium (Cd), chromium (Cr), nickel (Ni), lead (Pb), zinc (Zn), arsenic (As), and mercury (Hg) in sediments and the soft tissues of M. squalida from two sites on the southeastern coast of the Gulf of California, Mexico, were evaluated from April 2016 to April 2017 on a monthly basis. The metal concentrations in sediments from both sites did not exceed the Mexican and international regulations. Concentrations of Cd and Pb in the clams from Altata bay (2.49 and 5.68 µg/g dw, respectively) and Agiabampo bay (2.38 and 5.54 µg/g dw, respectively) exceeded the permissible limits recommended by Mexican sanitary regulations, thus representing a threat to human health. The higher values of Cd, As, and Hg obtained for the biota sediment accumulation factor in both sampling areas indicate that squalid callista is a strong accumulator of these metals. The metal burdens in sediments and M. squalida soft tissues are influenced by chemicals from agriculture and aquaculture, as well as urban sewage disposal near both sites. This study brings useful information on metal bioaccumulation in one of the most important commercial clam species on the Pacific coast.

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Biografía del autor/a

Carlos Humberto Sepúlveda, Centro Interdisciplinario de Investigación para el Desarrollo Integral Regional, Unidad Sinaloa, Instituto Politécnico Nacional CIIDIR-Sinaloa

SNI 1

Andrés Martín Góngora-Gómez, Instituto Politécnico Nacional-Centro Interdisciplinario de Investigación para el Desarrollo Integral Regional- Unidad Sinaloa, A las Glorias, San Juachin, Guasave, Sinaloa, CP 81101

Ph D, Aquaculture, Biology, distribution and culture of mollusks

Sandra Álvarez-Pérez, Facultad de Ciencias Agrícolas y Forestales, Universidad Autónoma de Chihuahua, Km 2.5, carretera Delicias-Rosales, campus Delicias, CD. Delicias, Chihuahua CP 33000

Ph D, Toxicology, heavy metals

Hervey Rodríguez-González, Instituto Politécnico Nacional-Centro Interdisciplinario de Investigación para el Desarrollo Integral Regional- Unidad Sinaloa, A las Glorias, San Juachin, Guasave, Sinaloa, CP 81101

Ph D, Aquaculture, Nutrition of Aquatic Organsims, Statistics

Norma Patricia Muñoz-Sevilla, Instituto Politécnico Nacional, Centro Interdisciplinario de Investigaciones y Estudios sobre Medio Ambiente y Desarrollo-CIIEMAD, 30 de Junio de 1520 s/n, La Laguna Ticoman, Gustavo A. Madero, 07340 Ciudad de México, CDMX CDMX

Ph D, Climate change, Toxicology

Brenda Paulina Villanueva-Fonseca, Universidad Autónoma de Occidente, Avenida Universidad S/N, Flamingos, 81048 Guasave, Sinaloa

Ph D, Biomonitoring, Toxicology

Juan Antonio Hernández-Sepúlveda, Instituto Politécnico Nacional-Centro Interdisciplinario de Investigación para el Desarrollo Integral Regional- Unidad Sinaloa, A las Glorias, San Juachin, Guasave, Sinaloa, CP 81101

Ms C, Environment, Mollusks

Manuel García-Ulloa Gómez, Instituto Politécnico Nacional-Centro Interdisciplinario de Investigación para el Desarrollo Integral Regional- Unidad Sinaloa, A las Glorias, San Juachin, Guasave, Sinaloa, CP 81101

Ph D, Biology, distribution, culture, toxicology and parasitology of mollusks

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