Resumen del producto

Evidence is increasing thath human activities can impact marine ecosystems in coastal and oceanic áreas. Simultaneously, oceanographic chanves caused by natural anomalies effect ecosystem functioning. Pelagic top predators Ie.g. sharks, tunas, billfishes, and mahi-mahi) are sensitive to natural and human-induced changes in marline food webs. Also, pelagic top predators may serve as bio-indicators of the health of marine food webs, because they bioaccumulate and biomagnify toxic concentrations of trace elements in their tissues, mainly through food consumption in the aquatic food web. I will present information on changes in the food webs utilized by billfishes, tunas, sharks, and mahi-mahi in the Eastern Pacific Ocean (Gulf of California and western coast of Baja California Sur) related to changes in fishing effort and natural anomalies, and information on trace elements (mercury and selenium) found in top predators and their prey to show the effect of pollution on their food webs.

Palabras clave: Trace elements; oceanographic changes; bioindicators; Pelagic top predators; ecosystem functioning

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