Registrado por

RODRÍGUEZ MARTÍNEZ ROSA ELISA

Tipo de artículo

Revistas indexadas

Título de artículo

Pelagic Sargassum as an emerging vector of high rate carbonate sediment import to tropical Atlantic coastlines

Volúmen

103332

Número de registro

NA

Campo

CIENCIAS DE LA TIERRA Y EL COSMOS

Disciplina

OTRAS ESPECIALIDADES EN MATERIA DE CIENCIAS DE LA TIERRA DEL COSMOS Y DEL MEDIO AMBIENTE

Subdisciplina

Resumen

Since 2011, pelagic Sargassum has inundated Caribbean, West African, and northern Brazilian shorelines in increasing volumes. These events are linked to the emergence of a major new Sargassum bloom region in the Atlantic Ocean, and annual high-volume Sargassum beachings are seemingly becoming an established norm. Resultant socioeconomic and ecological implications are widespread and potentially serious, but an important question that has so far received no attention is whether these Sargassum inundations might represent a new source of carbonate sediment in affected coastal areas. This sediment derives from calcareous epiphyte communities that colonise Sargassum, and if volumetrically significant, may help to counteract aspects of Sargassum beachings thought to reduce sediment supply and decrease coastal stability. Here we determine the carbonate contents of Sargassum from coastal waters of the Mexican Caribbean. Integrating these with volumetric data on beached Sargassum, we then estimate total epiphytic carbonate import during 2018 at 11 sites along a 60 km section of the Quintana Roo coast, Mexico. Based on measured mean carbonate content of Sargassum (2.09 percent wet weight, 95 percent confidence interval: 1.83–2.32), and estimates of annual beached Sargassum (7.0 * 103 kg drained weight*m of shoreline, 95 percent CI: 6.9–7.2), our findings indicate that Sargassum beachings in the Mexican Caribbean contributed an average of 179 kg CaCO3*m of shoreline (95% CI: 173–185) in 2018: close to our upper estimate of seagrass epiphyte contributions (210 kg*m). Although quantitative data on Sargassum beachings from other locations are sparse, numerous media reports suggest the scale of these events is comparable for many exposed tropical Caribbean and Atlantic shorelines. This represents the first documentation of pelagic Sargassum as a major vector of coastal sediment import, the significance of which has likely only arisen since the onset of large-scale inundations in 2011.

URL (DOI, ORCID, HANDLE, enlace)

Fuente

Global and Planetary Change

Número de Visitas

3