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Características físico-químicas y determinación de plaguicidas en el agua de la laguna de Gandoca, Limón, Costa Rica

ABSTRACT Nutrients and chlorophylls concentrations, as well as salinity, temperature and Secchi disk depth were determined from November 1999 to April 2000, at three stations and two depths, at Gandoca lagoon, Gandoca- Manzanillo National Wildlife Refuge, Limón, Costa Rica. Salinity profiles indicated that the lagoon was a salt wedge estuary with a partially mixed region near the mouth. No processes of eutrophication were found. The distribution and abundance of nutrients and chlorophylls showed a slight influence of continental water and water circulation patterns in the lagoon. A preliminary study was done in order to analyze the presence of 20 organochlorated and organophosphorated pesticides along the Gandoca lagoon in February 2000. None of the pesticides were detected by the analysis of residues from liquid-liquid extractions. The absence of the pesticides may be due to the fact that they did not reach the lagoon or, if they did, they were washed away by the strong rains during the sampling period.

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    • "Apart from a flood that washed away some trees, this mangrove seems to have very little impact from the local community, which is rather small (Coll et al. 2001); logging is not systematic, and locals are shifting their agricultural practices to ecotourism in the area of the lagoon. Levels of pesticide pollution were very low (Coll et al. 2004). Environmental awareness of the inhabitants of Gandoca and the protected status of this mangrove by the Gandoca Manzanillo National Wildlife Refuge might guarantee the mangrove´s survival, expansion and functionality, as well as better quality of life for the Gandoca inhabitants. "
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    ABSTRACT: The coral reefs, seagrasses and mangroves from the Costa Rican Caribbean coast have been monitored since 1999 using the CARICOMP protocol. Live coral cover at Meager Shoal reef bank (7 to 10 m depth) at the Parque Nacional Cahuita (National Park), increased from 13.3% in 1999, to 28.2% in 2003, but decreased during the next 5 years to around 17.5%. Algal cover increased significantly since 2003 from 36.6% to 61.3% in 2008. The density of Diadema antillarum oscillated between 2 and 7ind/m2, while Echinometra viridis decreased significantly from 20 to 0.6ind/m2. Compared to other CARICOMP sites, live coral cover, fish diversity and density, and sea urchin density were low, and algal cover was intermediate. The seagrass site, also in the Parque Nacional Cahuita, is dominated by Thalassia testudinum and showed an intermediate productivity (2.7 +/- 1.15 g/m2/d) and biomass (822.8 +/- 391.84 g/m2) compared to other CARICOMP sites. Coral reefs and seagrasses at the Parque Nacional Cahuita continue to be impacted by high sediment loads from terrestrial origin. The mangrove forest at Gandoca, within the Refugio Nacional de Vida Silvestre Gandoca-Manzanillo (National Wildlife Refuge), surrounds a lagoon and it is dominated by the red mangrove, Rhizophora mangle. Productivity and flower production peak was in July. Biomass (14 kg/m2) and density (9.0 +/- 0.58 trees/100 m2) in Gandoca were relatively low compared to other CARICOMP sites, while productivity in July in Costa Rica (4 g/m2/d) was intermediate, similar to most CARICOMP sites. This mangrove is expanding and has low human impact thus far. Management actions should be taken to protect and preserve these important coastal ecosystems.
    Revista de biologia tropical 10/2010; 58 Suppl 3:1-22. · 0.61 Impact Factor
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    • "2008 101 WINGCHING: RESIDUALIDAD DE SUSTANCIAS XENOBIÓTICAS EN EL SUELO sobre la toxicidad en cobre (Cordero y Ramírez 1979, Pérez y Bornemiza 1986, Granados y Bornemiza 1991 y Cabalceta et al. 1996), donde asocian el efecto de este elemento a la poca movilidad en el suelo, al pH, a los contenidos de carbonatos, a la capacidad de intercambio catiónica (CIC), al contenido de arcillas y al contenido de materia orgánica en el suelo. Por otra parte, los trabajos de Acuña et al. (2004), García- Céspedes et al. (2004) y Coll et al. (2004) se refi eren a los efectos residuales de hidrocarburos, metales traza y plaguicidas, en ambientes acuáticos en Costa Rica, respectivamente. "
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    ABSTRACT: Se resume la información disponible en la literatura sobre la residualidad en el suelo de los productos xenobióticos aplicados en los sistemas de producción animal, que se dosifi can directamente al animal o en el alimento a razón de 3 a 220 g por tonelada producida de alimento, dependiendo del tipo de animal y del antibiótico. Según las características químicas de cada sustancia, ésta será retenida en el suelo o se lixiviara, con la problemática de ser un precursor de contaminación de aguas subterráneas. También pueden sufrir biodegradación, fotodescomposición, inhibición por temperatura, ser absorbidas por la planta, hidrólisis o formar complejos con la materia orgánica. Durante la permanencia de estas sustancias en el suelo, éstas afectan las poblaciones de organismo reduciendo sus habilidades de competencia, tasas de mineralización, capacidad a biodegradación, resistencia a temperaturas extremas y la diversidad de metabolitos secundarios. La intensidad de estos efectos dependerá del tiempo de exposición, tipo de antibiótico, tipo de microorganismo y a la adición de nutrientes. Las alternativas empleadas como sustitutos de estas sustancias se han desarrollado paralelamente a la producción animal orgánica.
    Agronomía Mesoamericana 01/2008; DOI:10.15517/am.v19i1.5027
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    • "La laguna de Gandoca es producto de una depresión topográfica en la interfase tierra-mar creada por interacciones fluviales y de marea (Cortés 1998). Los niveles de contaminación en la laguna son muy bajos (Coll et al. 2004). Esta laguna es un hábitat clave para varias especies de agua dulce como cangrejos, algas, esponjas y ascídeas, y es uno de los sitios principales de crianza del sábalo Megalops atlanticus "
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    ABSTRACT: Monitoring of the mangrove forest at Gandoca, Costa Rica (CARICOMP site). The man- grove forest at Gandoca, Refugio Nacional de Vida Silvestre Gandoca-Manzanillo, Caribbean coast of Costa Rica, has been monitored since 1999, following the CARICOMP protocol. The dominant species was the red mangrove, Rhizophora mangle. The peak of productivity and flowering was in July. The mangrove productiv- ity decline from 2001 to 2004 while the temperature rised. Biomass (14 kg/m2) and density (9 trees/10 m2) in Gandoca were relatively low compared to other CARICOMP sites, while productivity in July in Costa Rica (4 g/m2/day) was intermediate, similar to most CARICOMP sites. Rev. Biol. Trop. 55 (1): 23-31. Epub 2007 March. 31.
    Revista de biologia tropical 01/2007; 55(1). DOI:10.15517/rbt.v55i1.6054 · 0.61 Impact Factor
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