Publications by authors named "F Galvan-Magana"
Article Synopsis
- The study investigates the feeding behavior and habitat use of thresher sharks in the Galapagos Marine Reserve, focusing on three life stages: neonate, juvenile, and adult.
- Significant differences in nitrogen isotopes (δN) were found between the two shark species, indicating different prey consumption patterns, while carbon isotopes (δC) showed similarity in habitat use.
- The neonate sharks displayed distinct isotopic signatures that suggest they still carry maternal influences, revealing important trophic dynamics and ontogenetic variations in their ecology.
Bioaccumulation and biomagnification of arsenic in the muscle and liver of the speckled guitarfish Pseudobatos glaucostigmus in Santa Rosalía, Gulf of California, Mexico.
Mar Pollut Bull
December 2024
Arsenic (As) concentrations were measured in the muscle and liver of the speckled guitarfish Pseudobatos glaucostigmus and its main prey Penaeus californiensis, in Santa Rosalia, western Gulf of California, to determine bioaccumulation and biomagnification. Higher mean wet weight (w.w.
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- Researchers measured levels of mercury, cadmium, and selenium in several shark species from the western coast of Baja California Sur, Mexico, which are significant for local fisheries.
- The study assessed compliance with Mexican dietary standards and examined potential health risks, particularly for vulnerable groups like young children and pregnant women, finding safe consumption limits based on estimated weekly intake.
- While general health risks for adults are low, children should limit their consumption to no more than 0.5 kg of shark meat per week to avoid carcinogenic risks.
Climate change is an environmental emergency threatening species and ecosystems globally. Oceans have absorbed about 90% of anthropogenic heat and 20%-30% of the carbon emissions, resulting in ocean warming, acidification, deoxygenation, changes in ocean stratification and nutrient availability, and more severe extreme events. Given predictions of further changes, there is a critical need to understand how marine species will be affected.
View Article and Find Full Text PDFThe whale shark (Rhincodon typus) is a filter-feeding organism that can be considered a sentinel species, and Bahía de los Ángeles (BLA) in the Gulf of California is an important sighting site for these elasmobranchs. This filter-feeding organism can be considered a pollutant sampler from the marine environment. Persistent organic pollutants are toxic compounds with high mobility and environmental persistence, bioaccumulation and trophic transfer.
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