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Antecedentes: La subcuenca Sayula localizada al centro-sur del estado de Jalisco, presenta un complejo paisaje conformado por diferentes comunidades vegetales a lo largo de un gradiente altitudinal. Pese a que existen diferentes trabajos del área, éstos no han abordado la distribución de la vegetación a lo largo de dicho gradiente, ni su interpretación bioclimática. Preguntas: ¿Cuál es la diagnosis bioclimática de la subcuenca? ¿Cuáles son los pisos bioclimáticos y como se vinculan con su correspondiente vegetación potencial natural? ¿Cuáles son los bioindicadores florísticos de cada piso bioclimático? Especies de estudio: Plantas vasculares, tipos de vegetación. Sitio y años de estudio: La subcuenca Sayula; 2017 a 2020. Métodos: Revisión de literatura, trabajo de campo, análisis bioclimático y trabajo de gabinete. Resultados: El área pertenece al Macrobioclima Tropical, reconociéndose los bioclimas Tropical Xérico y Tropical Pluviestacional; en el primero se incluyen los pisos bioclimáticos Termotropical Semiárido, Termotropical Seco y Mesotropical Seco, y en el segundo, los pisos bioclimáticos Mesotropical Subhúmedo y Mesotropical Húmedo. Las categorías mencionadas fueron trabajadas en un SIG obteniendo una cartografía que mostró su distribución espacial. Asimismo, la información geobotánica se sintetizó en una catena de vegetación representativa y en tablas que vinculan la información florística, vegetacional y bioclimática. Conclusiones: La diagnosis bioclimática permitió establecer la distribución de los pisos bioclimáticos, así como su relacióncon los tipos de vegetación. Los recambios en cuanto a fisionomía, estructura, composición y ecología de los pisos están enconsonancia con las variaciones de las condiciones bioclimáticas a lo largo del gradiente altitudinal. Translate stop

Background: seasonally dry tropical forests are considered critical and important ecosystems because they harbor exceptional biological diversity. Mexico lacks sound phytosociological studies of Seasonally Dry Tropical Forest and Michoacán is no exception. The present study may be regarded the first phytosociological in most of the Mexican pacific coast where seasonally dry tropical forests occurs. Questions/Objective: We aimed at describing the representative plant associations of the seasonally dry tropical forest, distributed on western Michoacán and to provide a sintaxonomic classification framework based on the floristic differentiation of the recognized communities and highlight its phytocenotic diversity. Study site and dates: Estado de Michoacán; 20 years. Methods: A total of 82 phytosociological inventories were conducted. Data were submitted to multivariate two-way indicator species analyses to depict plant communities and their ecological affinities. Results: From its analysis and interpretation, nine plant groups were differentiated, of which all but one was given the rank of association, which are Lysilomo acapulcensis–Heliocarpetum terebinthinacei, Ceibo aesculifoliae–Lysilometum divaricatae, Caesalpinio platylobae-Cordietum elaeagnoidis, Cochlospermo vitifolii-Lueheetum candidae, Lysilomo divaricatae-Cordietum elaeagnoidis; Stenocereo quevedonis-Cordietum selerianae, Guazumo ulmifoliae-Cordietum elaeagnoidis¸ Lonchocarpo huetamoensis-Cordietum elaeagnoidis and the community of Spondias purpurea-Cochlospermum vitifolium. Conclusions: Comparative floristic and structural profiles among plant communities permitted us to distinguish their bioclimatic relationships. Diagnostic species representative of all plant associations were selected and used for sintaxonomic nomenclature. Plant associations were finally array along bioclimatic and altitudinal gradients and showed in arranged phytosociological tables. The plant association/community’descriptions permitted to compare structural physiognomy, floristic composition, ecological affinities, distribution patterns and bioclimatic liaison among them.

Background: The Sayula sub-basin presents a complex landscape composed of plants communities that to date have not been studied in a timely manner, so this study contributes to the knowledge of the flora and vegetation of the area and the State. Question: i) How many and which families, genera and species are in the Sayula sub-basin? ii) What are the main biological forms of the species? iii) Are there species under any category of protection? iv) How many vegetation types are present within the region? Studied species: Ferns, Gymnosperms and Angiosperms. Study site and years of study: The Sayula sub-basin, Jalisco, Mexico; from February 2012 to October 2015. Methods: Through the literature review and field work the floristic checklist was elaborated. In addition, with the use of geographic information systems, a map of land use and vegetation was made. Results: A total of 687 species were recorded, including 415 genera and 113 families. The five main families were Poaceae, Asteraceae, Fabaceae Solanaceae and Euphorbiaceae representing 42.6 % of the total species and 36.6 % of the genera. It should be noted that the predominant biological forms were herbs with 409, 105 shrubs and 74 trees. On the other hand, 47 species registered under some protection category of which, only one species Cleomella jaliscensis is endemic to the region. Finally, eight vegetation types were determined, being the tropical deciduous forest the one that occupies greater surface and presents greater floristic diversity. Conclusions: It is important to emphasize that during the realization of the work, agricultural activities were detected affecting the flora and vegetation, threatening the biodiversity and the natural balance of the region.

En el desierto de San Felipe de Baja California se registraron 324 especies de plantas vasculares, agrupadas en 68 familias y 206 géneros, siendo 9 especies endémicas. Las familias con mayor diversidad fueron Asteraceae y Fabaceae, las cuales constituyen el 13.0% (42) y el 9.3% (30), respectivamente, del total de la flora. Entre las diferentes formas de crecimiento que se presentan, las hierbas anuales fueron las más numerosas (129 especies), sufrútices (57), hierbas perennes (55), arbustos (40), suculentas (22), trepadoras (8), árboles y rosetas (5 cada una) y parásitas (4).