Metal mobility and bioaccumulation differences at lower trophic levels in marine ecosystems dominated bySargassumspecies

Abstract

Concentrations of cadmium (Cd), lead (Pb), copper (Cu), zinc (Zn) and iron (Fe) were measured in three macroalgal species, Codium simulans, Sargassum sinicola and Gracilaria pachydermatica, and in the sea slug Elysia diomedea, living in marine ecosystems dominated by Sargassum species and located near exploited phosphorite deposits. Metal concentrations in macroalgae and sea slugs were significantly different among sites. The highest concentrations of Cd recorded in C. simulans and S. sinicola, as well as in E. diomedea were recorded at the site closest to the phosphorite deposit. In general, Cd and Zn concentrations in E. diomedea were higher than those recorded in specimens of C. simulans, S. sinicola and G. pachydermatica. In contrast, Pb, Cu, and Fe concentrations in E. diomedea were lower than or similar to those in macroalgae from all sampled sites. The information generated contributes to the knowledge about potential mobility and metal bioaccumulation at lower trophic levels in marine eco systems.

Hypnea musciformis (Wulfen) J. V. Lamour. (Gigartinales, Rhodophyta) responses to gasoline short-term exposure: biochemical and cellular alterations

“…Besides, there are other elements responsible for gasoline toxic effects. Among them, heavy metals are present in variable amounts or composition (Pulles et al 2012) being responsible for organisms changes in metabolism and as well as its lower physiological resilience of (Hernandez-Almaraz et al 2014).…”

Macroalgae from two coastal lagoons of the Gulf of California as indicators of heavy metal contamination by anthropogenic activities

“…An ~0.5 g sample of dried material was digested in a 3:1 nitric acid:hydrogen peroxide solution (reagent grade, Avantor Performance Material, Central Valley, PA) in a microwave oven (Mars 5X, CEM, Matthews, NC). Concentrations of cadmium, lead, copper, zinc, nickel, manganese and iron in the digested samples were quantified by flame atomic absorption spectrophotometry using an air-acetylene flame (Avanta, GBC Scientific Equipment, Braeside, VIC, Australia) (Méndez et al ., 2006; Hernández-Almaraz et al ., 2014). The accuracy of the analytical methods was validated as per the International Atomic Energy Agency (Reference Material IAEA-392 – trace, minor and major elements in algae).…”

“…Previous studies conducted in Guaymas Bay and La Paz Bay involving organisms such as clams, urchins and fish, as well as sediments, measured Cd, Cu, Pb, Zn, Ni and Mn concentrations. Until the past decade, these metals in macroalgae still maintained levels considered typical of non-polluted sites, despite some of these study sites being known for heavy anthropogenic activities that could potentially release toxic wastes into the environment (Méndez et al ., 2002, 2004, 2006; Hernández-Almaráz et al ., 2014, 2016; Serviere-Zaragoza et al ., 2021).…”

Bacterial flora associated with commercial Octopus maya captured in the Yucatan Peninsula, Mexic

“…En el área de Baja California Sur, México, Siqueiros-Beltrones & Riosmena Rodríguez (1995) identificaron 102 especies de macroalgas. Adicionalmente, para la zona se conocen otros aspectos comunitarios, como la variabilidad espaciotemporal de especies conspicuas (Cruz-Ayala, 1996), las especies con mayor producción de biomasa (Fajardo, 1993) y los cambios en contenidos de minerales ante los procesos de contaminación (Páez-Osuna et al, 2000;Hernández-Almaraz et al, 2014.…”