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versión On-line ISSN 2343-6468
Resumen
RODRIGUEZ, Meximara y GOMEZ, Irma. Microbial activity in surface sediments of mangrove forest of Pertigalete Bay (Anzoátegui, Venezuela), during the up welling and transition periods. Saber [online]. 2016, vol.28, n.3, pp.511-522. ISSN 2343-6468.
The Pertigalete Bay is bordered by an extensive mangrove zone and it is affected by an intense boating and sailing traffic, the pouring of the waste water coming from the nearing population and effluent from the company Cements of Venezuela. The objective of this research was to determinate the microbial activity and the possible anthropogenic impact in surface sediments of mangrove zones in the Pertigalete Bay during the up welling and transition periods. The microbial biomass (Cmic), the basal respiration (RB), dehydrogenases activity (DHS), fluorescein diacetate hydrolysis (HDAF) and the metabolic quotient (qCO2) were used in the determination of the microbial activity. In three zones of the bay three transects of 30 m of length were established with a separation of 10 m among them. In each transect, three sampling points were placed and triplicate samples of the surface sediments were taken from each. The results showed that during the up welling period there is a higher Cmic in the three selected zones: 851.01; 539.87 and 533.66 mg Cmic kg-1 sediment in zones I, II and III, respectively. The DHS indicated that there is a predominance of the anaerobic heterotrophic population during this period. The HDAF confirmed that there is a higher heterotrophic activity during the up welling and the qCO2 indicated a greater efficiency in the use of carbon by the microorganism present in the sediments. The results showed that the predominance of the microbial flora and its activity in the sediments is mainly determined by the up welling and transition periods, especially in the zone I, which is less exposed to the anthropogenic action.
Palabras clave : Microbial biomass; anthropogenic impact; dehydrogenases activity.
