Antecedentes y Objetivos: Los ambientes de los litorales rocosos del estado de Veracruz, México, son sitios únicos en los que la riqueza específica macroalgal ha sido poco estudiada, ya que se carece de listados florísticos completos y de un seguimiento a los cambios en las poblaciones algales. El objetivo de este trabajo fue contribuir al conocimiento de algas de los ambientes rocosos veracruzanos ubicados en Playa Paraíso, Playa Villa Rica y Playa Muñecos, los cuales están influenciados por las estribaciones del Eje Neovolcánico.Métodos: Las algas se recolectaron durante la época de lluvias (septiembre 2016) y de secas (mayo 2017) en Playa Paraíso (PP), Playa Villa Rica (PVR) y Playa Muñecos (PM). Las muestras se preservaron en una solución de agua de mar y formol al 4%. Se realizaron observaciones morfométricas externas e internas de los talos y se determinaron las especies de acuerdo con literatura taxonómica especializada.Resultados clave: Se determinaron un total de 45 especies, de las cuales 18 fueron Chlorophyta, 16 Rhodophyta y 11 Ochrophyta. Las familias mejor representadas fueron Corallinaceae, Rhodomelaceae, Cladophoraceae y Dictyotaceae. La mayor riqueza de especies se observó en PP durante la época de secas. Se mencionan nuevos registros para las localidades de estudio; de éstos, Centroceras gasparrinii, Gracilaria apiculata y G. flabelliformis son nuevos registros para el estado de Veracruz.Conclusiones: La flora algal del litoral rocoso Neovolcánico de Veracruz es de tipo tropical y alberga 31% de la flora algal regional del estado de Veracruz. Los nuevos registros en cada una de las localidades reflejan que aún prevalece una brecha en el conocimiento de la riqueza algal de esta región. Por lo tanto, se sugiere continuar con el registro de especies en la zona con la finalidad de integrar los listados florísticos correspondientes.

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Macroalgae are an ideal substratum for multiple species of diatoms that are ingested along with their hosts by many species of grazers including abalones (Haliotis spp.). Much of the diet of abalones along the western coast of the Baja California peninsula (Mexico) depends on blades of the kelp Macrocystis pyrifera that is heavily colonized by diatoms. Although the kelp Eisenia arborea (its ecological alternative) is an acceptable food-source for Haliotis spp., the epiphytic diatom flora living on this kelp was hitherto unknown. Thus, the association structure of the epiphytic diatoms growing on blades of E. arborea from the western coast of Baja California Sur (B.C.S.) was determined. We tested the hypothesis that the epiphytic diatom assemblages on blades of E. arborea collected at different dates would show low species diversity and taxa representing distinct stages of succession. We identified 99 diatom taxa that represent the first floristic list of diatoms living on E. arborea. Values of diversity (H´) were lower than usual and, together with an extremely high dominance of Pteroncola inane (a new record for the region), the structure of the diatom assemblage is regarded atypical, similar to those measured for assemblages from extreme environments. However, structure analysis did not permit distinction of succession stages in the epiphytic diatom assemblage.

Juniperus plant species are rich sources of bioactive secondary metabolites and are traditionally used for the treatment of several illnesses, including those related to hyperglycemia and diabetes. The major bioactive compounds identified in certain species of this genus are terpenes and phenolics. Juniperus deppeana Steud. is mainly used as a wood resource and its chemical composition has been partially established. Our goal was to perform a comprehensive profiling of a methanolic extract of leaves of J. deppeana, and to determine its potential as a source of α-amylase and α-glucosidase inhibitors. Terpene and phenolic compounds were putatively identified based on their accurate mass spectrometric data. Regarding terpenes, we found mainly diterpenes, specifically dehydroabietic acid-like, hinokiol-like, agathic acid-like and dihydroxyabietatrienoic acid-like compounds. Isopimaric acid was also identified and its identity was confirmed by coelution with an authentic standard via comparing retention time, mass spectrum, and collisional cross section (CCS) values. For phenolic compounds, we identified mainly compounds with a chemical structure similar to the biflavonoids amentoflavone and bilobetin. Besides, the methanolic extract of J. deppeana leaves show inhibition of α-amylase (IC50= 85.11 ± 11.91 µg mL-1) and α-glucosidase (IC50= 32.50 ± 3.40 µg mL-1) enzymes, demonstrating a potential alternative for the search of antidiabetic natural products.