Characterization of black mangrove (Avicennia germinans) and red mangrove (Rhizophora mangle) ecosystems in Paraíso, Tabasco, Mexico

Objective: The characterization of black and red mangrove ecosystems in the coastal zone of Paraiso, Tabasco, Mexico. Design/methodology/approach: Four plots were randomly set in each mangrove ecosystem. Inside each plot, trees were counted, and measured for basal area, DBH, vegetation cover and height. We estimated seven diametric classes to calculate the relative species richness and emergence/disappearance dynamics in both ecosystems. Soil samples were survey at two depths and during different seasons (dry and rainfall), the samples were tested for organic matter (OM), soil organic carbon (SOC), nitrogen content (N), phosphorus (Olsen P), pH, exchangeable bases and humic and fulvic acids; with the objective to characterize nutrient flux dynamics between seasons and compare the two mangrove ecosystems.   Results: Red mangrove ecosystems contains higher OM during rainy season. Black mangrove ecosystems showed low contents of OM and exchangeable bases during dry season. More species richness was achieved by red mangroves, and black mangroves presented higher and thicker trees.                 Limitations on study/implications: Regional characterization of mangrove ecosystems provide information about nutrient flux, which is necessary to the adequate proposal of protection and conservation programs of these wetlands. Findings/conclusions: Dominant mangrove specie affect nutrient flux in soils associated to these ecosystems, suggesting they have specific functions in the ecosystem dynamics.O Objective: To characterize black and red mangrove ecosystems in the coastal zone of Paraíso, Tabasco, Mexico. Design/Methodology/Approach: Four plots were randomly established in each mangrove ecosystem. Inside each plot, trees were counted per transect, and measured for basal area, diameter at breast height, plant cover and height. Seven diametric classes were estimated to calculate the relative species richness and the dynamics of emergence/disappearance in the ecosystem. Soil samples were surveyed at two depths and during different seasons (dry and rainy). The samples were tested for organic matter (OM), nitrogen content (N), phosphorus (Olsen P), pH, exchangeable bases and humic and fulvic acids; with the objective to characterize nutrient flux dynamics between seasons and compare the two mangrove ecosystems. Results: Red mangrove ecosystems contain higher OM during rainy season. Black mangrove ecosystems showed low contents of OM and exchangeable bases during dry season. The species with more individuals m-2 is red mangrove, and black mangrove presents individuals with greater basal area and diameters. Study Limitations/Implications: Regional characterization of mangrove ecosystems provides information about nutrient flux, which is necessary for the adequate proposal of protection and conservation programs of these wetlands. Findings/Conclusions: The dominant mangrove species affects nutrient flux in soils associated to the ecosystem, suggesting they have specific functions in the ecosystem dynamics