ABSTRACT. The term lunar phobia is used to explain the behavior that some nocturnal animals have to avoid periods with greater moonlight intensity. The aim was to determine the eect of the brightness of the new moon and the full moon on the richness, abundance and diversity of the phyllostomid bat community at the La Ceiba estate, Tuxpan, Veracruz, where the study was conducted from October 2013 to February 2014 using ve mist nets for two nights per month. We captured 142 bats belonging to eight species, with Artibeus lituratus being the species with the highest records in both lunar phases (74 individuals). Although no signicant dierences were found in diversity between the two lunar phases, greater cumulative species richness and abundance were recorded in the new moon (eight species, 118 individuals) than the full moon (ve species, 24 individuals). The signicant decrease in abundance between the new moon and the full moon, mainly of small frugivorous species, indicates that lunar luminosity aects bat activity. It also has an eect on total species richness as three species were exclusively recorded in the new moon phase.Key words: Abundance, Chiroptera, diversity, moon phases, species richness RESUMEN. El término fobia lunar se emplea para explicar el comportamiento que algunos animales nocturnos presentan al evadir los periodos con mayor luminosidad de la luna. El objetivo fue conocer el efecto de la luminosidad de luna nueva y la luna llena sobre la riqueza, abundancia y diversidad de murciélagos. El estudio se realizó en la nca La Ceiba de octubre 2013 a febrero 2014 empleando cinco redes de niebla durante dos noches por mes. Se capturaron 142 murciélagos pertenecientes a ocho especies, siendo Artibeus lituratus la especie con mayores registros en ambas fases lunares. Aunque no se encontraron diferencias signicativas en la diversidad entre ambas fases lunares, se registró una mayor riqueza y abundancia acumulada en la luna nueva con ocho especies y 118 individuos. Lo que demuestra que la luminosidad lunar afecta la actividad de los murciélagos al presentarse una disminución signicativa de la abundancia entre la luna nueva y la luna llena, principalmente de especies frugívoras pequeñas, mientras que en la luna nueva se registraron tres especies exclusivas.
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