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Relationship among physicochemical conditions, chlorophyll-a concentration, and water level in a tropical river-floodplain system

Cruz Ramírez, Allan K [autor] | Salcedo Meza, Miguel Ángel [autor] | Sánchez, A. J [autor/a] | Barba Macías, Everardo [autor] | Mendoza Palacios, Juan de Dios [autor].
Tipo de material: Artículo en línea Artículo en línea Tipo de contenido: Texto Tipo de medio: Computadora Tipo de portador: Recurso en líneaTema(s): Llanuras sujetas a inundaciones | Nivel del agua | Características fisicoquímicas del agua | Clorofila | Fitopláncton | Producción de biomasaTema(s) en inglés: Flood plains | Water levels | Physicochemical characteristics of water | Chlorophyll | Phytoplankton | Biomass productionDescriptor(es) geográficos: Río Chaschoc (Tabasco, México) | Río Usumacinta Nota de acceso: Disponible para usuarios de ECOSUR con su clave de acceso En: International Journal of Environmental Science and Technology. volumen 16, número 7 (July 2019), páginas 3869-3876. --ISSN: 1735-2630Número de sistema: 41663Resumen:
Inglés

The free-flowing Usumacinta River maintains an average annual water-level fluctuation of 6.7 m. This study evaluated relationships between 14 physicochemical and biological variables and key factors in four water-level conditions in a river-floodplain system. The analysis incorporated intra-annual variation in all variables, with each selected in accordance with multiple statistical and physicochemical criteria. Possible correlations were examined as a function of various physicochemical and biological factors at each water level. Within the study area, defined by a temporal gradient in principal component 1, the yearly river overflow above the bankfull stage is characterized by water with a low level of total suspended solids. Data on riverine wetlands suggest that seasonal changes are key to determining intra- and inter-annual chlorophyll-a levels and water clarity. However, opposite trends are observed for high and low water-level conditions. Nutrient enrichment cannot be taken as the key physicochemical factor of water level, under either water-level conditions, due to the lack of a temporal gradient in principal component 2 and the high biochemical variability of nitrate and orthophosphate levels. In conclusion, the hypothesis was accepted for the production of phytoplankton biomass and light attenuation at low and high water levels, as both were dependent on intra-annual changes. The increases in chlorophyll-a related to the minimal variability at the lowest water level open the opportunity to gauge this relationship as a possible environmental predictor for river-floodplain systems.

Recurso en línea: https://link.springer.com/article/10.1007/s13762-018-2127-7
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Disponible para usuarios de ECOSUR con su clave de acceso

The free-flowing Usumacinta River maintains an average annual water-level fluctuation of 6.7 m. This study evaluated relationships between 14 physicochemical and biological variables and key factors in four water-level conditions in a river-floodplain system. The analysis incorporated intra-annual variation in all variables, with each selected in accordance with multiple statistical and physicochemical criteria. Possible correlations were examined as a function of various physicochemical and biological factors at each water level. Within the study area, defined by a temporal gradient in principal component 1, the yearly river overflow above the bankfull stage is characterized by water with a low level of total suspended solids. Data on riverine wetlands suggest that seasonal changes are key to determining intra- and inter-annual chlorophyll-a levels and water clarity. However, opposite trends are observed for high and low water-level conditions. Nutrient enrichment cannot be taken as the key physicochemical factor of water level, under either water-level conditions, due to the lack of a temporal gradient in principal component 2 and the high biochemical variability of nitrate and orthophosphate levels. In conclusion, the hypothesis was accepted for the production of phytoplankton biomass and light attenuation at low and high water levels, as both were dependent on intra-annual changes. The increases in chlorophyll-a related to the minimal variability at the lowest water level open the opportunity to gauge this relationship as a possible environmental predictor for river-floodplain systems. eng

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