Trace metals in two wild populations of the squalid callista clam (megapitaria squalida) in the southeastern gulf of california, mexico

• Sepúlveda, Carlos Humberto ^[4] ; Góngora-Gómez, Andrés Martín ^[5] ; Álvarez-Pérez, Sandra ^[1] ; Rodríguez-González, Hervey ^[5] ; Muñoz-Sevilla, Norma Patricia ^[2] ; Villanueva-Fonseca, Brenda Paulina ^[3] ; Hernández-Sepúlveda, Juan Antonio ^[5] ; García-Ulloa Gómez, Manuel ^[5]
  1. [1] Universidad Autónoma de Chihuahua

     Universidad Autónoma de Chihuahua

     México

     
  2. [2] Instituto Politécnico Nacional

     Instituto Politécnico Nacional

     México

     
  3. [3] Universidad Autónoma de Occidente

     Universidad Autónoma de Occidente

     Colombia

     
  4. [4] Posgrado en Ciencias en Recursos Acuáticos, Facultad de Ciencias del Mar, Malecón de Mazatlán, Balcones de Loma Linda, 82000 Mazatlán, Sinaloa
  5. [5] Instituto Politécnico Nacional-Centro Interdisciplinario de Investigación para el Desarrollo Integral Regional- Unidad Sinaloa, A las Glorias, San Juachin, Guasave, Sinaloa, CP 81101

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• Localización: Revista Internacional de Contaminación Ambiental, ISSN 0188-4999, Vol. 36, Nº. 3, 2020, págs. 667-676
• Idioma: inglés
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• 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.