Silva-Ontiveros, C.A., S., de los Santos-Villalobos, J.R., Torres, M., Martínez-Porchas, A., Piñón-Gimate & J.A., Arreola-Lizárraga (2024). Comportamiento estacional de bacterias en sedimentos de mangle negro Avicennia germinans. Madera y Bosques. 30(4): e304260-e304260. DOI: 10.21829/myb.2024.3042609.
Crhistian Anibal Silva-Ontiveros 1, Sergio de los Santos-Villalobos 2, Jony R. Torres 3, Marcel Martínez-Porchas 4, Alejandra Piñón-Gimate 5 y José Alfredo Arreola-Lizárraga 6
Bacteria are essential for the functioning of themangrove ecosystem. The objective of this study was to examine the seasonalbehavior of densities and cellulolytic activity of heterotrophic bacteria inblack mangrove Avicennia germinans sediments and their relationship withlitterfall, water, and sediment variables in a semi-arid subtropical coastallagoon. The study was conducted in the coastal lagoon El Soldado, located inthe central region of the Gulf of California’s eastern coast. Water, sediment,and litterfall of Avicennia germinans were sampled during an annual cycle. Inthe water, physicochemical parameters and dissolved inorganic nutrients weredetermined; in the sediments, texture, organic matter, dissolved inorganicnutrients, as well as densities and cellulolytic activity of heterotrophicbacteria, were evaluated. The results showed higher values of densities andcellulolytic activity of heterotrophic bacteria in spring (4.9 log CFU g-1; 75%) and summer (4.9 log CFU g-1; 94%), and lower values in autumn (3.9 log CFU g-1; 27%) and winter (3.9 log CFU g-1; 11%). The highest water temperature values,ammonium in water, organic matter in sediments and mangrove litterfall wereobserved in spring and summer, showing the highest bacterial density. It isconcluded that the bacterial densities and cellulolytic activity in blackmangrove sediments from an arid region exhibit a seasonal pattern coupled withorganic matter inputs and water temperature changes. This evidence is importantbecause it contributes to understanding the role of bacteria in ecosystemfunctioning.
Palabras clave: bacterial communities; biogeochemical processes; cellulolytic activity; Coastal ecosystems; Gulf of California; litter production
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