Blue carbon in mangrove sediments from Mazatlán, Mexican Pacific; a century of urbanization and neglect
Por:
Jupin J.L.J., Ruiz-Fernández A.C., Sánchez-Cabeza J.A., Pérez-Bernal L.H.
Publicada:
1 ene 2025
Resumen:
Despite ranking among the most productive and most efficient blue carbon sink ecosystems, mangrove forests still face worldwide loss due to deforestation and land-use change. Uncertainties remain about the impact of anthropogenic disturbances on belowground mangrove carbon stock and the potential contribution of their destruction to global warming through CO2 emissions. In this study, geochemical data (element composition, grain size distribution, and magnetic susceptibility) obtained from two 210Pb-dated sediment cores, were used to evaluate temporal changes in sediment and Corg accumulation over the past century in the urbanized mangrove area of Estero El Infiernillo, a northern channel of the coastal lagoon Estero de Urías, in Mazatlán (southern Gulf of California). Sediment accumulation rates (0.06–2.4 g cm-2 yr-1) and Corg burial rates (22–1100 g m-2 yr-1) increased over time in tandem with population growth in Mazatlán. Multivariate analysis of geochemical data revealed a progressive transition from a predominantly marine environment (before the 1900s) to a more terrigenous one over the past 100 years. The time-dependent Corg stock (1.9–6.5 Mg ha-1) decreased owing to reductions in sea water exchange and marine-Corg inputs as a result of anthropogenic coastline modifications and ecosystem disturbances. The destruction of the present carbon stock would release 26,000 ± 13 to 44,000 ± 14 t CO2eq, thereby contributing to global warming and causing a mean economic loss of ~1.2 million USD for Mazatlán. These findings demonstrate the effects of anthropic activities on the climate regulation services afforded by mangroves. The methods employed here can be replicated worldwide to underscore the importance of integrated coastal management in preserving blue carbon ecosystems as a nature-based solution for mitigation of climate change. © 2025 The Author(s)
Filiaciones:
Jupin J.L.J.:
Posgrado en Ciencias Del Mar y Limnología, Universidad Nacional Autónoma de México, Av. Universidad 3000, Ciudad Universitaria, Coyoacán, Ciudad de México, 04510, Mexico
IRD, CNRS, SU, MNHN, IPSL, LOCEAN, Laboratoire d'Océanographie et du Climat: Expérimentation et Approches Numériques Centre IRD France Nord, Bondy, 93143, France
Ruiz-Fernández A.C.:
Unidad Académica Mazatlán, Instituto de Ciencias del Mar y Limnología, Universidad Nacional Autónoma de México, Sin., Mazatlán, 82040, Mexico
Sánchez-Cabeza J.A.:
Unidad Académica Mazatlán, Instituto de Ciencias del Mar y Limnología, Universidad Nacional Autónoma de México, Sin., Mazatlán, 82040, Mexico
Pérez-Bernal L.H.:
Unidad Académica Mazatlán, Instituto de Ciencias del Mar y Limnología, Universidad Nacional Autónoma de México, Sin., Mazatlán, 82040, Mexico
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