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Hidrobiológica
versión impresa ISSN 0188-8897
Resumen
CRUZ-RAMIREZ, Allan K. et al. Intra-annual variation of chlorophyll-a and nutrients in a hydraulically perturbed river-floodplain system in the Grijalva River basin. Hidrobiológica [online]. 2019, vol.29, n.3, pp.163-170. Epub 13-Sep-2021. ISSN 0188-8897. https://doi.org/10.24275/uam/izt/dcbs/hidro/2020v29n3/cruz.
Background:
The lateral connectivity in the Maluco river-floodplain system was partially reduced by the highway built on a natural barrier.
Goal:
To determine if the concentrations of chlorophyll-a (Chl-a) and nutrients contrast in different water levels (WL) during a hydrologic year in the Maluco river-floodplain system.
Methods:
The WL, Chl-a, and nutrients (NO2 -, NO3-, NH4+, and TP) were simultaneously measured six times in two sites during two years. The expected differences of Chl-a and nutrients concentrations, related to the intra-annual fluctuation of the WL, were tested through multivariate techniques. The hypothesis holds that there will be no intra-annual differences of Chl-a and nutrients due to the reduction of lateral interconnection by the physical effect of the embankment.
Results:
No variable was discarded during PCA. The intra-annual distribution of samples was similar according to the similarity profile routine. Furthermore: 1) more than 54% of the Chl-a and TP values indicated hypereutrophic conditions throughout the year, and 2) none of the values of WL surpassed the height of the bankfull (4.5 masl). The maximum concentrations of Chl-a were registered at the minimum WL values.
Conclusions:
The intra-annual similarity of Chl-a and inorganic nutrients can be linked to the disconnection between the floodplain and the Grijalva river since the bankfull was not overflowed throughout the sampling time. The intra-annual trend independent at the time of persistence of the high Chl-a and TP concentrations in the river-floodplain system opens up the opportunity to estimate the minimum input flow required to biogeochemical processes in a long-term study.
Palabras llave : Embankment; eutrophication; fragmentation; Grijalva river; hydraulic disconnection.