Published
2024-06-14
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Physicochemical characterization of the aquatic-terrestrial transition zone of a tropical wetland (Ayapel-Colombia)

DOI: https://doi.org/10.22490/21456453.6681
Section
Área Ambiental

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Maria Camila Díaz Mesa Universidad de Antioquia
Esnedy Hernández Atilano Universidad de Antioquia
Diana María Agudelo Echavarría Fundación Universitaria Católica del Norte
Nora Elena Villegas Jiménez Universidad de Antioquia
Laura María Lozano Sarria Universidad de Antioquia
Gabriel Adolfo Agudelo Echavarría Universidad de Antioquia
Sergio Esteban Herazo Areiza Universidad de Antioquia
Lina María Berrouet Cadavid Universidad de Antioquia
Natalia Espinosa Aguirre Universidad de Antioquia
Yarin Tatiana Puerta Quintana Universidad de Antioquia
Fabio De Jesús Vélez Macías Vélez Macías Universidad de Antioquia
Néstor Jaime A guirre Ramírez Universidad de Antioquia
Mario Alberto Quijano Abril Universidad Católica de Oriente
Jose Miguel Rojas Villa Universidad Católica de Oriente
Daniela Cardona Alzate Universidad Católica de Oriente
Daniela Salazar Suaza Universidad Católica de Oriente
Alvaro Wills Toro Universidad de Antioquia

Contextualization: The aquatic-terrestrial transition zone (ZTAT) in the floodplain (alluvial plain) Ramsar Ayapel (Colombia) remains flooded for more than half of the year, and its coastal strip generates a strong influence on the ecosystem. An approach to the spatial and temporal characterization of this zone is crucial for further functional analysis, especially when tropical floodplains are little explored except for some Amazonian ecosystems.

 Knowledge gap: Floodplain dynamics are mainly regulated by flood pulses, directly influencing he physical and chemical conditions of water and sediment. Therefore, the biota is adapted to the flooding and waterlogging conditions of the ecosystem. However, research has addressed the terrestrial and aquatic phases as separate systems, making it necessary to resort to methodologies that demonstrate connectivity in the system and facilitate the interpretation of key factors in the ecological functioning of tropical wetlands.

 Purpose: The research analyzed the structure and functioning of the ZTAT through physical and chemical variables at different times of the flood pulse.

 Methodology: In two wetlands of the muddy complex, sensitive to the flood pulse, three samplings were carried out: rising water (July/2021), high water (September/2021), and declining water (March/2022). The ZTAT was monitored by delimiting it into four subzones: water, sediments, floodable soil, and soil.

Results and conclusions: Significant changes in time associated with water level and nitrogen concentrations were revealed; while in space, assisted by the contrast of the ZTAT at the two sites, differences were reflected through in situ variables and soil characteristics. It was detected that depth, transparency, and a higher concentration of nitrogen forms, and some ions such as aluminum and magnesium generated differences on a time level. On the contrary, conductivity, calcium concentration, and variables associated with soil characteristics expressed it at the spatial level due to exploring the ZTAT. Therefore, the physicochemical dynamics of moments and sites in a wetland require a sampling design that, using the ZTAT, facilitates the scale of physicochemical analysis.