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  • 1
    Publication Date: 2017-01-25
    Description: Complex marine-terrestrial interactions characterize Chilean fjords, where benthic communities influence the distribution of organic matter (OM). We examined spatial and seasonal changes in the hydrography, sediment conditions and soft-bottom macrobenthic, meiobenthic, and total microbial biomass in a glacial Patagonian fjord (Martinez Channel, Chile). The transport of a high load of glacial mineral and particulate OM to the fjord in the austral summer coincided with low total live benthic biomass. Multivariate analysis evidenced temporal-related macrofaunal groups influenced by the different environments produced by the advection of sediment transport and terrestrial OM from the Baker River, Chile. The relationships between density/biomass and respiration versus body size varied considerably with distance from major riverine inputs, but the slopes of density size spectra and normalized biomass size spectra were less negative in summer than in winter. Occasional large-scale advective processes in the water column affected sediment conditions and removed surface macrofauna, influencing the slope and intercept of the regression models. In the outer fjord, lateral advection and subsequent sedimentation of terrestrial OM contributed a significant fraction to total OM sediments (〈14.76%). Stable carbon isotopes measured in benthic organisms suggest that benthic communities in the inner fjord may assimilate a significant fraction of terrestrial OM via heterotrophic bacteria in contrast to the minor input of terrestrial OM in the outer fjord.
    Repository Name: EPIC Alfred Wegener Institut
    Type: Article , isiRev
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  • 2
    Publication Date: 2021-05-19
    Description: Se exponen los resultados del estudio de impacto ambiental llevado a cabo durante 3 años en la zona costera sur central del golfo de Guacanayabo. El estudio comprende la evaluación de la calidad de agua y de los sedimentos de las principales fuentes de abasto de la granja camaronera CALISUR y la zona costera adyacente. Los valores obtenidos de los análisis en agua y sedimentos de las áreas de estudios permitieron dar una valoración del estado ambiental de las zonas, revelando el no impacto de la granja camaronera en la zona costera, salvo en el sistema lagunar Las Playas, ecosistema muy deteriorado, dadas sus características como receptor directo de los residuales camaroneros por el sistema de producción de la granja. Según los datos obtenidos de los muestreos en 2005 y considerando los datos de 2002 y 2004, se puede plantear que las aguas de la laguna han continuado recibiendo el impacto directo de la granja camaronera CALISUR y su calidad entra en el rango de dudosa a mala. En cuanto a los sedimentos, según los límites que establece la Norma Cubana No. 25/99, se pueden considerar los suelos como normales con una tasa alta de descomposición. Con este estudio, se recomiendan acciones al sector productivo para el mejoramiento y manejo de la calidad de agua de la granja y de la fuente de abasto de agua de mar y como mejorar las condiciones ambientales del sistema lagunar.
    Description: The environmental impact study results are exposed carried out during 3 years in the south central coastal area of the Guacanayabo gulf. The study understands the evaluation of the water and sediment quality of the main supply sources of the CALISUR shrimp farm and the adjacent coastal area. The obtained values of the water and sediment analyses of the studies areas allowed to give a environmental valuation of the coastal zone, revealing the CALISUR shrimp farm no impact in the coastal area, only in The Beaches lagoon system, ecosystem that have been deteriorated given their characteristics as direct receiver of the shrimp farm waste water by the normal shrimp farm production system. According to the obtained samplings data in 2005 and considering the data of 2002 and 2004, we can say that the lagoon waters have continued receiving the direct impact of the CALISUR shrimp farm and their quality is into the doubtful to bad range. About the sediment quality, according to the Cuban Law No. 25/99 establishes limits, they can be considered the floors like normal with a high decomposition rate. With this study, we recommended some actions to apply in the productive sector about the shrimp farm water quality management, and how to improve the seawater supply and the environmental conditions of the lagoon system.
    Description: Published
    Keywords: Environmental impact ; Coastal zone management ; Shrimp farming
    Repository Name: AquaDocs
    Type: Working Paper , Refereed , Article
    Format: 17
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