Tracing organic matter sources in a tropical lagoon of the Caribbean Sea

Détails

ID Serval
serval:BIB_58130953ED16
Type
Article: article d'un périodique ou d'un magazine.
Collection
Publications
Institution
Titre
Tracing organic matter sources in a tropical lagoon of the Caribbean Sea
Périodique
Continental Shelf Research
Auteur(s)
Alonso-Hernandez Carlos M., Garcia-Moya Alejandro, Tolosa Imma, Diaz-Asencio Misael, Corcho-Alvarado Jose Antonio, Morera-Gomez Yasser, Fanelli Emanuela
ISSN
0278-4343
Statut éditorial
Publié
Date de publication
08/2017
Peer-reviewed
Oui
Volume
148
Pages
53-63
Langue
anglais
Résumé
The natural protected lagoon of Guanaroca, located between Cienfuegos Bay and the Arimao River, Cuba, has been heavily impacted by human-induced environmental changes over the past century. Sources of organic matter in the Guanaroca lagoon and concentrations of radioisotopes (Pb-210, Ra-226, Cs-137 and Pu-239,Pu-240), as tracers of anthropogenic impacts, were investigated in a 78 cm sediment core. Variations in total organic carbon (TOC), total nitrogen (TN), stable isotopic composition (delta C-13 and delta N-15) and ratio of total organic carbon to total nitrogen (C/N) were analysed. On such a basis, environmental changes in the lagoon were revealed. Down core variation patterns of the parameters representing sources of organic matter were predominantly related to the impacts of human activities. Up to the nineteenth century, the principal sources of organic matter to sediments (more than 80%) were a mixing of terrestrial vascular plants (similar to 48%) and freshwater phytoplankton (similar to 8%), with minimal contribution from the marine component (similar to 16%). In the period 1900-1980, due to the strong influence of human activities in the catchment area, the water exchange capacity of the lagoon declined sub stantially, as indicated by the relatively high proportion of organic matter originated from human activities (58%). Since 1980, as a result of management actions in the protected area, the lagoon has regained gradually its capability to exchange freshwater, showing sources of organic matter similar to the natural conditions recorded previous to 1900, although an indication of human impact (treated sewage contributed for 26% to the organic matter in sediments) was still observed and further management measures would be required.
Mots-clé
Aquatic Science, Geology, Oceanography
Web of science
Création de la notice
24/08/2017 10:26
Dernière modification de la notice
20/08/2019 15:11
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