Ranchería River delta (La Guajira, Colombia): flow, salinity and sediment transport, and its possible influence on mangrove composition and structure
DOI:
https://doi.org/10.17533/udea.acbi.329400Keywords:
flow, mangroves, salinity, solid transport, structureAbstract
Interstitial water level, salinity, flow, and dissolved suspended and total solids were measured monthly from December 1999 to August 2001, in 60 permanent sampling 20 x 20 m plots (sea level and river flow for past yearswere taken from IDEAM); topographic profiles of paired transects on the Ranchería river branches Riíto (RT) and Valle de los Cangrejos (VC), Colombian Caribbean, were made. All those variables were compared with structure parameters of the mangrove forest, taken from Vásquez at 2000. Salinity was higher in VC than in RT, and is presumed to exert influence, together with the water level, area, composition and structure of the mangroves. Sewage discharged to RT through box culverts may affect the forest structure. Intermittent waterflows into the VC only during the rainy season. Total solids (400.5 mg l-1), as well as hydrological readings, were higher at RT. The average flow of the Ranchería was 6.3 m3 s-1, and RT do channel 3.5 m3 s-1. While A. germinans do respond directly to salinity, and better to dry conditions, L. racemosa do it inversely. Human populations have been settling on the delta while it has going dry, since its riverine mangroves do function as sediment traps, and the Caimancito branch has allowed the development of fresh water species
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