Abstract
The seasonal influence of tidal regimes on sulfidic conditions was studied in intertidal environments from a mangrove estuary in Northern Peru. Along two sampling stations, creek water and sediment cores were collected during the dry and wet seasons at all tidal phases (ebb, low, flow, and high tides). Physical-chemical parameters were measured in the creek water (temperature, salinity, pH, Eh, and DO), whereas pH, redox potential (Eh), and total organic matter contents were obtained from the sediment cores. In addition, total dissolved sulfide content ∑ (H2S, HS−, H2−) was measured from sediment pore water. During the dry and wet seasons, the creek water pH, Eh, and dissolved oxygen were lowest in low tide, whereas oxygenated conditions and higher pH and Eh values prevailed in high tide. The total organic matter content in sediments was higher during the dry season, with the highest contents observed in the seaward station. Higher average ∑H2S (landward station, 243.1 ± 234.9 μM L−1; seaward station, 544.9 ± 174.4 μM L−1) were noted during wet season compared to dry season (landward station, 5.3 ± 4.5 μM L−1; seaward station, 430.2 ± 435.1 μM L−1). These ∑H2S contents increased towards the bottom of the sediment column, reflecting the anaerobic decomposition of the organic matter and sulfate reduction. This study provides insight to the geochemical dynamics of intertidal mangrove sediments that are sensitive to fluctuating reducing and sulfidic conditions, oscillating at time scales of minutes to hours.
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Acknowledgements
This study was carried out within the framework of the project “Impacto de la Variabilidad y Cambio Climático en el Ecosistema de Manglares de Tumbes” supported by the “International Development Research Centre (IRDC)” of Canada under management of the “Instituto Geofísico del Perú (IGP),” in cooperation with the “Instituto del Mar del Perú (IMARPE)” and the “Universidad Peruana Cayetano Heredia (UPCH).” The authors acknowledge the “Cátedra CONCYTEC program” in “Ciencias del Mar” that funded the Master Program in Marine Sciences at UPCH. Detailed geochemical analyses were supported by the IRDC and IMARPE. AP is supported by the “Fondo Nacional de Desarrollo Cientifico Tecnologico y de Innovacion Tecnológica” (Fondecyt, Peru), through the MAGNET research program. CJS is supported by the Australian Research Council (DE160100443). We would like to thank our colleagues Dr. Ken Takahashi, Ernesto Fernández, Wilson Carhuapoma, Percy Montero, Rubén Alfaro, Manuel Vera, and Dr. Jorge Cardich who provided us with invaluable help.
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Pérez, A., Gutiérrez, D., Saldarriaga, M.S. et al. Tidally driven sulfidic conditions in Peruvian mangrove sediments. Geo-Mar Lett 38, 457–465 (2018). https://doi.org/10.1007/s00367-018-0549-3
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DOI: https://doi.org/10.1007/s00367-018-0549-3