Between 2017 and 2018, samplings out for four months in a tropical evergreen forest fragment from a natural protected area of Chiapas, Mexico, were carried. Pitfall traps were installed along a path of about 500 m. The traps were baited with freshly killed individuals of Messicobolus magnificus, an abundant millipede during the rainy season in the reserve. 108 individuals of four beetles’ species were captured: Canthon vazquezae (92), Deltochilum pseudoparile (13), Coprophanaeus corythus (2) and Ateuchus rodriguezi (1). Only D. pseudoparile has been previously collected with carcasses from other millipede species. The use of this resource type is possibly an alternative source that reduces interspecific competition among the Scarabaeinae for other ephemeral resources.

Entre 2017 y 2018 se realizaron muestreos durante cuatro meses en un fragmento de bosque tropical perennifolio de un área natural protegida de Chiapas, México. Se instalaron trampas de caída ubicados a lo largo de un trayecto de aproximadamente 500 m. Las trampas fueron cebadas con individuos recién muertos de Messicobolus magnificus, un milpiés abundante en la reserva durante la temporada lluviosa. Se capturaron 108 individuos de cuatro especies de escarabajos: Canthon vazquezae (92), Deltochilum pseudoparile (13), Coprophanaeus corythus (2) y Ateuchus rodriguezi (1). Únicamente D. pseudoparile ha sido previamente recolectada con carroña de otras especies de milpiés. El uso de este tipo de recurso posiblemente sea una fuente alterna que permite reducir la competencia interespecífica por otros recursos efímeros entre los Scarabaeinae.

El Zapotal Recreational Ecological Preserve (CEREZ) is characterized by presenting one of the last remnants of tropical forest in the central region of Chiapas, Mexico. However, the knowledge of some taxa of the reserve is not entirely adequate. In this work the composition and structure, as well as the temporal distribution of the dung beetles that reside in CEREZ, are analyzed. Monthly samplings were carried out between February 2013 and January 2014 using pitfall traps baited with dung of six mammal species that are kept in captivity inside the Miguel Álvarez del Toro Zoo (ZooMAT). An annotated checklist of 22 species grouped into 12 genera and six tribes of Scarabaeinae is presented. Onthophagus anthracinus, Canthon femoralis, Onthophagus landolti, and Copris laeviceps provide 89.7% of the total abundance. The rarefaction curve shows an asymptotic tendency, with 92% completeness. Th...

El Zapotal Recreational Ecological Preserve (CEREZ) is characterized by presenting one of the last remnants of tropical forest in the central region of Chiapas, Mexico. However, the knowledge of some taxa of the reserve is not entirely adequate. In this work the composition and structure, as well as the temporal distribution of the dung beetles that reside in CEREZ, are analyzed. Monthly samplings were carried out between February 2013 and January 2014 using pitfall traps baited with dung of six mammal species that are kept in captivity inside the Miguel Álvarez del Toro Zoo (ZooMAT). An annotated checklist of 22 species grouped into 12 genera and six tribes of Scarabaeinae is presented. Onthophagus anthracinus, Canthon femoralis, Onthophagus landolti, and Copris laeviceps provide 89.7% of the total abundance. The rarefaction curve shows an asymptotic tendency, with 92% completeness. Th...

The snowy plover (Charadrius nivosus) is one of the least abundant shorebirds. It is an endangered species whose populations are in steady decline. Mexico is important for the populations of this species, but there is little information on its reproduction and threats. To obtain data on nesting and potential threats, we monitored the snowy plover population at Atotonilco Lagoon during the breeding season (March-July) in 2020. We conducted counts of individuals and nests, clutch size, approximate egg-laying date, and observations on threats present during this period. Males represented 85% (n = 140) of the total population and the month with the highest number of nests was May (n = 15). The average nest size was 2.5 eggs. Water surface area was variable during the sampling months, but it was not statistically proven that the greater the desiccation, the smaller the nest size (p = 0.09). T...