Resumen

BASANEZ-MUNOZ, A. de J. et al. Comparison of mangrove structural values in different conditions of ecological degradation. Polibotánica [online]. 2022, n.54, pp.51-69.  Epub 12-Sep-2022. ISSN 1405-2768.  https://doi.org/10.18387/polibotanica.54.4.

Changes in hydrology in mangroves translate into well-defined degradation gradients that mainly translate into a decrease in their structure. A good estimator of the structure of a forest is the Complexity Index, which relates density, basal area, height and the number of species present in 0.1 ha. A neotropical mangrove swamp located within Ramsar site No. 1602 was fragmented by the construction of three solid structures across the width of the forest. This eventually caused the degradation of the forest, with three scenarios, apparently undegraded sections, semi-degraded and complete mortality. The present work, based on two ecological index, seeks to find changes in the behavior of the tree structure and regeneration that show the degradation process. A reference site was established and four more transects were made covering the width of the mangrove and all degradation scenarios. Quadrants were made every 25 m, taking the indicators to process the Complexity Index and a Regeneration Index. The reference site presented the best regeneration value and the second best in tree structure in relation to the forest fragments. When comparing for the degradation condition, the reference site and the area that apparently is not degraded had close values, not the semi-degraded condition that presented values ​​much lower, mainly attributed to its low density and height of its individuals. Compared to the reference site, the apparently non-degraded areas of the forest fragments have good structural development and regeneration, so a rehabilitation is feasible to solve the stress caused and begin its recovery, not so for the total mortality area, which requires active intervention to begin a slow process that leads to its integration into the other areas.

Palabras llave : Complexity; Density; Height; Index; Mexico; Tampamachoco; Tuxpan.

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