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Effect of organic nitrogen and carbon mineralization on sediment organic matter accumulation in fish ponds

In aquaculture, ponds with high loads of organic inputs, organic matter accumulates at the bottom over time. Uneaten feed, senescent phytoplankton and faeces are the principal sources of accumulated material, but quanti¢cations are scarce. The sedimented organic matter develops into a £occulent laye...

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Autores Principales: Jiménez, Ricardo, Verdegem, Marc, van Dam, Anne A., Verreth, Johan
Formato: Artículo
Idioma: Inglés
Publicado: Aquaculture Research 2020
Materias:
NITROGEN FLUX
MINERALIZATION
ORGANIC MATTER ACCUMULATION
MODELLING
ACUICULTURA
SEDIMENTACIÓN
CALIBRACIÓN
Acceso en línea: http://hdl.handle.net/11056/18305
id RepoUNACR18305
recordtype dspace
spelling RepoUNACR183052024-01-22T20:52:02Z Effect of organic nitrogen and carbon mineralization on sediment organic matter accumulation in fish ponds Jiménez, Ricardo Verdegem, Marc van Dam, Anne A. Verreth, Johan NITROGEN FLUX MINERALIZATION ORGANIC MATTER ACCUMULATION MODELLING ACUICULTURA SEDIMENTACIÓN CALIBRACIÓN In aquaculture, ponds with high loads of organic inputs, organic matter accumulates at the bottom over time. Uneaten feed, senescent phytoplankton and faeces are the principal sources of accumulated material, but quanti¢cations are scarce. The sedimented organic matter develops into a £occulent layer in which di¡erent processes transformthematerial into inorganic forms. A better understanding of factors influencing organic matter accumulation/decomposition in the sediment is needed to better understand and manage the dynamics of nitrogen in fish ponds. In this study, the rate of mineralization of organic nitrogen and the nitrogen flux between the sediment and the water column were measured. Organic matter accumulation in fish ponds was quanti¢ed, and the data were used to construct, calibrate and validate a dynamic simulation model of organic matter deposition/decomposition in fish ponds. The accumulating material consisted of dead phytoplankton, fish faeces and uneaten feed. Through model calibration, the proportion of these materials in the total accumulated organic matter was determined. In the model, gross photosynthetic rate was estimated from an empirical relationship with feed input. After calibration, the model was validated using independent data. The model simulated well the concentrations of organic carbon and nitrogen in the sediments but it may be developed further, especially by considering the e¡ects of resuspension. En la acuicultura, estanques con altas cargas de insumos orgánicos, la materia orgánica se acumula en el fondo con el tiempo. Los piensos no consumidos, el fitoplancton senescente y las heces son las principales fuentes de material acumulado, pero las cuantificaciones son escasas. La materia orgánica sedimentada se convierte en una capa occulenta en la que diferentes procesos transforman el material en formas inorgánicas. Es necesario comprender mejor los factores que influyen en la acumulación / descomposición de materia orgánica en el sedimento para comprender y gestionar mejor la dinámica del nitrógeno en los estanques de peces. En este estudio, se midieron la tasa de mineralización de nitrógeno orgánico y el flujo de nitrógeno entre el sedimento y la columna de agua. Se cuantificó la acumulación de materia orgánica en estanques de peces y los datos se utilizaron para construir, calibrar y validar un modelo de simulación dinámica de la deposición / descomposición de materia orgánica en estanques de peces. El material acumulado consistió en fitoplancton muerto, heces de pescado y alimento no consumido. Mediante la calibración del modelo, se determinó la proporción de estos materiales en el total de materia orgánica acumulada. En el modelo, la tasa fotosintética bruta se estimó a partir de una relación empírica con la entrada de alimento. Después de la calibración, el modelo se validó utilizando datos independientes. El modelo simuló bien las concentraciones de carbono orgánico y nitrógeno en los sedimentos, pero se puede desarrollar más, especialmente considerando los efectos de la resuspensión. Universidad Nacional, Costa Rica Escuela de Ciencias Biológicas 2020-10-06T20:43:40Z 2020-10-06T20:43:40Z 2005-07-01 http://purl.org/coar/resource_type/c_6501 http://hdl.handle.net/11056/18305 10.1111/j.1365-2109.2005.01307.x eng Acceso abierto application/pdf Aquaculture Research Aquaculture Research vol.36 983-995 2005
institution Universidad Nacional de Costa Rica
collection Repositorio UNA-Costa Rica
language Inglés
topic NITROGEN FLUX
MINERALIZATION
ORGANIC MATTER ACCUMULATION
MODELLING
ACUICULTURA
SEDIMENTACIÓN
CALIBRACIÓN
spellingShingle NITROGEN FLUX
MINERALIZATION
ORGANIC MATTER ACCUMULATION
MODELLING
ACUICULTURA
SEDIMENTACIÓN
CALIBRACIÓN
Jiménez, Ricardo
Verdegem, Marc
van Dam, Anne A.
Verreth, Johan
Effect of organic nitrogen and carbon mineralization on sediment organic matter accumulation in fish ponds
description In aquaculture, ponds with high loads of organic inputs, organic matter accumulates at the bottom over time. Uneaten feed, senescent phytoplankton and faeces are the principal sources of accumulated material, but quanti¢cations are scarce. The sedimented organic matter develops into a £occulent layer in which di¡erent processes transformthematerial into inorganic forms. A better understanding of factors influencing organic matter accumulation/decomposition in the sediment is needed to better understand and manage the dynamics of nitrogen in fish ponds. In this study, the rate of mineralization of organic nitrogen and the nitrogen flux between the sediment and the water column were measured. Organic matter accumulation in fish ponds was quanti¢ed, and the data were used to construct, calibrate and validate a dynamic simulation model of organic matter deposition/decomposition in fish ponds. The accumulating material consisted of dead phytoplankton, fish faeces and uneaten feed. Through model calibration, the proportion of these materials in the total accumulated organic matter was determined. In the model, gross photosynthetic rate was estimated from an empirical relationship with feed input. After calibration, the model was validated using independent data. The model simulated well the concentrations of organic carbon and nitrogen in the sediments but it may be developed further, especially by considering the e¡ects of resuspension.
format Artículo
author Jiménez, Ricardo
Verdegem, Marc
van Dam, Anne A.
Verreth, Johan
author_sort Jiménez, Ricardo
title Effect of organic nitrogen and carbon mineralization on sediment organic matter accumulation in fish ponds
title_short Effect of organic nitrogen and carbon mineralization on sediment organic matter accumulation in fish ponds
title_full Effect of organic nitrogen and carbon mineralization on sediment organic matter accumulation in fish ponds
title_fullStr Effect of organic nitrogen and carbon mineralization on sediment organic matter accumulation in fish ponds
title_full_unstemmed Effect of organic nitrogen and carbon mineralization on sediment organic matter accumulation in fish ponds
title_sort effect of organic nitrogen and carbon mineralization on sediment organic matter accumulation in fish ponds
publisher Aquaculture Research
publishDate 2020
url http://hdl.handle.net/11056/18305
_version_ 1796410070662119424
score 12.2319145

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