Concentrations of seven metals (As, Cd, Cr, Cu, Pb, Ni, and Zn) were analyzed in 33 bone tissue samples of Antillean manatees (Trichechus manatus manatus) found dead in lagoons and rivers of Tabasco and Campeche in the Gulf of Mexico and Chetumal Bay in the Caribbean region. The concentrations of Cr, Cu, Pb, and Zn were significantly different between regions, with greater levels found in the Gulf of Mexico group than in the Mexican Caribbean group (p < 0.05). Pb concentrations differed significantly between adults and calves. No differences were observed between sexes. Metal concentrations detected in the manatee bones were higher than most of those reported for bones in other marine mammals around the world. Future studies are necessary to establish whether the metal concentrations represent a risk to the health of the species.
El tapir centroamericano (Tapirella bairdii) es el mamífero más grande del Neotrópico, y se considera como una especie indicadora de la calidad de hábitat en los bosques tropicales. Recientemente, se documentó la presencia, por primera vez, de una población residente de T. bairdii en la Sierra Mixe, Oaxaca. Aquí se estimó la densidad poblacional del tapir centroamericano en esta localidad usando el método de captura-recaptura por fototrampeo, y con 5 observadores independientes. Se estimaron 6 individuos del tapir centroamericano en un área de 18.75 km 2 y una densidad de 0.32 ind/km 2 , que es una de las más elevadas reportadas para la familia Tapiridae. Estos resultados ubican a Totontepec como una zona de relevancia para la conservación de la especie.
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