as ri b e ras de los ríos son sistemas ab i e rtos con propiedades físicas y biológicas propias, a lo largo de los cuales se redistribuye el material orgánico transportado por la corriente del río. Debido a la proximidad y la interacción con los cuerpos de agua, la vegetación ribereña tiene una forma lineal característica y constituye una zona 17 Resumen: Se analizó la estructura y la composición de la vegetación ribereña de la porción media-alta del río Tembembe, Morelos, México. Se registró la altura, el diámetro, la cobertura y la identidad taxonómica de cada individuo 1 cm D AP en 23 unidades de muestreo de 100 m 2 cada una. En total se registraron 74 especies y 516 individuos. La densidad promedio fue de 2,148 ind. ha -1 ; el área basal promedio de 88.39 m 2 ha -1 y la altura promedio (de individuos con DAP 20 cm) de 10.5 m. Con base en análisis de clasificación se distinguieron tres comunidades vegetales cuya distribución está asociada al gradiente altitudinal: la primera (G1) en la parte alta (1,700 -1,650 m s.n.m.), con especies dominantes de afinidad holártica (como Alnus acuminata); la segunda (G2) en la parte media (1,640 -1,340 m s.n.m.), dominada por Trema micrantha; y la tercera (G3) en la porción baja (1,210 -1,110 m s.n.m.), dominada por especies de afinidad neotropical, como Daphnopsis salicifolia. La diversidad, la densidad y la cobertura no difirieron significativamente entre las tres comunidades, pero el área basal fue mayor en las comunidades alta y baja que en la intermedia. La altura promedio del estrato arbóreo disminuyó con la altitud. El presente estudio cont ri bu ye al conocimiento de la vegetación ri b e reña del estado de Morelos y pro p o rciona info rmación ecológica básica para futuro s programas de restauración de la vegetación ribereña del río Tembembe. Palabras clave: composición florística, diversidad florística, estructura de la vegetación, gradiente altitudinal, vegetación ribereña.Abstract: Structure and composition of the riparian vegetation of the middle-upper basin of the Tembembe river, in the state of Morelos, was analyzed. Height, diameter at breast height, crown area and taxonomic identity of each individual having a DBH 1 cm were recorded in 23 quadrats of 100 m 2 each. A total of 74 species and 516 individuals were found. Mean density was 2,148 ind. ha -1 , mean basal area was 88.39 m 2 ha -1 , and mean height (of individuals with DBH 20 cm) w as 10.5 m. Classification analysis allowed the discrimination of three communities whose distribution was associated to the altitudinal gradient: the first (G1) in the upper part (1,700 -1,650 m a.s.l.) was dominated by species (like Alnus acuminata) having a holartic affinity; the second (G2) at an intermediate altitude (1,640 -1,340 m a.s.l.) was dominated by Trema micrantha; and the third (G3) in the lower portion (1,210 -1,110 m a.s.l.) dominated by species (like Daphnopsis salicifolia) having a tropical affinity. Diversity, density and crown cover did not differ among them, but mean basal area was largest in the highest ...
Protected areas play a fundamental role in national, regional, and global climate change adaptation strategies. They safeguard and enhance the resilience of ecosystems and protect clean water and other vital services that human communities rely on for their well-being. This paper highlights how protected areas agencies and their partners in four countries have begun working together to implement ecosystem-based approaches to climate change adaptation. By sharing experiences and knowledge, protected area agencies in Kenya, Mexico, Chile and Colombia have increased local and national capacity to contribute to climate adaptation strategies through research, monitoring, planning, active management and ecological restoration projects. By also identifying opportunities to engage communities and offer meaningful visitor and learning experiences as part of on-the-ground activities, the projects are inspiring citizens and building understanding of how protected areas help address global challenges like climate change.
Editorial Trillas. 417 pp. cepal. 1995. Los procesos de deterioro de bosques, suelos, biodiversidad y aguas continentales en México, LC/R. 1541.
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