Keywords
sediments
mangrove forest
Térraba Sierpe National Wetland
Costa Rica.
morfodinámica litoral
sedimentación litoral
bosque de manglar
Térraba-Sierpe
Costa Rica.
How to Cite
Abstract
In the last sixty years many geomorphological changes have occurred in Costa Rica's Térraba-Sierpe National Wetlands. Changes in coastal geomorphology are generally associated with erosion or accretion of sediment, which has led to the removal of sections of mangrove forests or sediment banks colonized by mangroves. The aim of this study was to analyze sedimentation as a leading process in the dynamics of coastal morphology and its implications for mangrove forest cover in the Boca Zacate area of Térraba-Sierpe wetlands. The study was conducted in the sectors of Bocón, Brujo and Coco Island in Boca Zacate, from 2008 to 2013. The research was based on a multi-temporal analysis of coastal morphology using aerial photographs from the years 1948, 1960, 1974, 1978, 1984, 1992 and 2011. The following measurements were also performed: monthly sedimentation rate (g/cm2/day), and granulometric composition and content of chemical elements in the sediments of the study area. These last two measurements were performed once each in the dry and rainy seasons during the years of study. The results indicated that over the past 60 years, Boca Zacate has witnessed a process of sustained erosion; from 1948 through 2001, losing 10.6 % of its land and approximately 8.9 % of its forest cover. It has also experienced accretion in the area of Coco Island. The Brujo sector showed the highest sedimentation rate and the Camibar estuary, the lowest. The dominant type of sediment in all study sites was sand, followed by clay and silt. The most widespread chemical elements (mg/L) included magnesium, calcium and potassium; others, such as manganese, iron, aluminum, phosphorus, zinc and copper, were measured in smaller amounts. Transport, composition and quantity of sediment in Boca Zacate are crucial to the changes that have occurred on the coastal area of La Boca, where the presence of dead trees was evident. This geomorphological analysis holds great importance for future guidelines and actions for the conservation and integrated management of the mangrove in Terraba- Sierpe National Wetlands.References
Adams, A. E., MacKenzie, W. S., & Guilford, C. (1984). Atlas of Sedimentary Rocks under the Microscope. Inglaterra: Longman Group Ltd. Essex.
Alongi, D. (2002). Present state and future of the world's mangrove forests. Environmental Conservation, 3, 331-349.
Alongi, D. M., Boto, K. G., & Robertson, A. (1992). Nitrogen and phosphorus cycles. In A. I. Robertson, & D. M. Alongi (Eds.), Tropical mangrove ecosystems (pp. 251-292). Washington, DC: American Geophysical Union.
Arche, A. (1989). Deltas. In A. Arche (Ed.), Sedimentología (pp. 395-449). Madrid, España: Consejo Superior de Investigación Científicas.
Bird, E., & Barson, M. (1977). Measurement of physiographic changes on mangrove-fringed estuaries coastlines. Marine Research Indonesia, 18, 73-80.
Blanco, J. F., Estrada, L. F., & Urrego, L. E. (2012). Ecosystem-Wide Impacts of Deforestation in Mangroves: The Uraba Gulf (Colombian Caribbean) Case Study. ISRN Ecology, 1-14.
Blasco, F., Saenger, P., & Janodet, E. (1996). Mangroves as indicators of coastal change. Catena, 27, 167-178.
Cárdenes, G. (2003). Evolución de los sistemas sedimentarios costero y aluvial de la región de Parrita, Pacífico Central de Costa Rica. Revista Geológica de América Central, 31, 45-59.
Cedeño, B., López, A., Villalobos, E., & Hernández, A. (2012). Ejes modificadores de las condiciones biofísicas de la Cuenca del Río Grande de Térraba. Revista Geográfica de América Central, 48, 95-116.
Denyer, P., Cárdenes, G., & Kruse, S. (2004). Registro histórico y evolución de la barra arenosa de Puntarenas, Golfo de Nicoya, Costa Rica. Revista Geológica de América Central, 31, 45-59.
Elliot, T. (1991). Deltas. In H. Reading (Ed.). Sedimentary Environments and Facies (2da ed.). Londres, Inglaterra: Oxford.
Ellison, J. C. (1998). Impacts of sediment burial on mangroves. Marine Pollution Bulletin, 37, 420-426.
Espinoza, J., Rojas, E., Aguilar, J., Gutiérrez, V., Granados, G., & Rodríguez, H. (2005). Análisis Sedimentológico del Delta Térraba. Campaña Geológica 2005. San José: Universidad de Costa Rica.
Furukawa, K., & Wolanski, E. (1996). Sedimentation in mangrove forest. Mangroves and salt marshes, 1, 3-10.
González, C., Urrego, L., Martínez, J., Polanía, J., & Yokoyama, Y. (2010). Mangrove dynamics in the southwestern Caribbean since the “Little Ice Age”: A history of human and natural disturbances. The Holocene, 20, 849-861.
Gutiérrez, E. M. (2008). Geomorfología. Madrid, España: Pearson/Prentice Hall.
Jiménez, J. A., Lugo, A. E., & Cintrón, G. (1985). Tree mortality in mangrove forests. Biotropica, 17, 177-185.
Kathiresan, K. (2003). How do mangrove forest induce sedimentation? Revista Biología Tropical, 51, 355-360.
Lizano, O., & Salas, M. (2001). Variaciones geomorfológicas en los últimos 50 años de la Isla Damas, Quepos, Costa Rica. Revista de Biología Tropical, 49, 171-177.
Lizano, M., & Lizano, O. (2010). Creación de escenarios de inundación en la Ciudad de Puntarenas ante el aumento del nivel del mar. InterSedes, XI(21), 215-229.
Lizano, R. O. G. (2012). Estudio oceanográfico costero en las desembocaduras del Humedal Nacional Térraba Sierpe (HNTS). Informe Técnico preparado para El Instituto Costarricense de Electricidad (ICE), Proyecto Hidroeléctrico El Diquís (PHED).
Lizano, O. G., Alfaro, E. J., & Salazar, A. (2012). Un método para evaluar el enriquecimiento de metales en sedimentos marinos en Costa Rica. Revista de Biología Tropical, 60(Suppl. 2), 197-211.
Lizano, O. (2013). Erosión en las costas de Costa Rica. Módulo de Información Oceanográfica. Recuperado de http://www.miocimar.ucr.ac.cr/erosioncostarica.
Middelburg, J., Nieuwenhuize, J., Slim, F., & Ohowa, B. (1996). Sediment biogeochemistry in an East African mangrove forest (Gazi Bay, Kenya). Biogeochemistry, 34, 133-155.
Mora, S. C. (1989). Extent and social-economic significance of slope instability in Costa Rica. In Landslides: Extent and Economic Significance. Proceedings of the 28th International Geological Congress: Symposium on Landslides (pp. 93-99). Balkema: Rotterdam.
Olsen, R., Cole, C. V., Watanabe, F. S., & Dean, L. A. (1954). Estimation of available phosphorus in soils by extraction with sodium bicarbonate. USDA Circ. 939 USDA, Washington, DC.: Government printing office.
Ortiz, M. E. (2008). Cambios geomorfológicos en el litoral Caribe y Pacífico de Costa Rica. Caso del Complejo Déltico de Sierpe. Revista Forestal Mesoamericana Kurú, 5, 15.
Rojas, N. (2011). Cuenca Río Grande de Térraba. San José, Costa Rica.
Woodroffe, C. (1992). Mangrove Sediments and Geomorphology. In D. Alongi, & E. Robertson (Eds.), Coastal and Estuarine Studies, Tropical Mangrove Ecosystems (pp. 51-70). Washington, DC: American Geophysical Union.
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