Otto Raúl Leyva-Ovalle

Alpha Diversity of the Myrmecofauna of the Natural Protected Area Metlac from Fortin, Veracruz, Mexico

Abstract. Although the State of Veracruz is a megadiverse entity, it has the highest annual deforestation rates. Protected natural areas are considered strategic to preserve local biodiversity. In this paper, composition and alpha diversity of ant assemblages were analyzed in the natural protected area ‘Metlac’ near Fortin, Veracruz, Mexico. Sampling was conducted at four transects using baited pitfall traps and hand-collection. In total 3,204 ant workers belonging to 36 species, 21 genera, 12 tribes, and seven subfamilies were collected. The average alpha diversity was 16 species and no significant differences between recorded richness in each transect were found. Average sampling completeness was above 80%. Locally, Solenopsis geminata and Nylanderia steinheili dominate the epigeous and shrub strata due probably to their biological, behavioral and ecological plasticity that allows them to easily adapt to disturbed environments. This paper shows that for the small area sampled, the relict of tropical semi-evergreen forest is of great biological value despite heavy human intervention and the space-geographic context in which it is found.

Variación Temporal y Espacial de la Abundancia del Picudo Negro (Rynchophorus palmarum L., Coleoptera: Curculionidae) en Cultivos de Palmas Ornamentales del Centro de Veracruz, México

Resumen. Rhynchonphorus palmarum es una plaga importante en los cultivos de palmas de América puesto que es el vector del nematodo Bursaphelenchus cocophilus causante de la enfermedad del anillo rojo. Debido a que en el centro de Veracruz, México el cultivo de palmas ornamentales es económicamente importante, en este trabajo se analizó su abundancia temporal y espacial. Se reporta por primera vez para el Estado de Veracruz la presencia de R. palmarum asociado a diferentes hospederos. Se encontró que este escarabajo es significativamente abundante en la época lluviosa, lo cual coincide con la sincronía existente entre el ciclo biológico de este escarabajo y las estaciones del año en la región. Se encontró un efecto significativo de la abundancia de Whashingtonia robusta, Livistonona australis, y Dypsis lutescens, con la abundancia de R. palmarum. Nuestros resultados sugieren una preferencia de este insecto por hospedar en Washintonia robusta.

Myrmecofauna from Three Ornamental Agroecosystems with Different Management and a Forest Remnant in Ixtaczoquitlán, Veracruz, Mexico

Abstract. Ornamental horticulture is the commercial exploitation of fresh or preserved species that satisfy the visual tastes of consumers. This report compares the alpha and beta diversity associated with the myrmecofauna of ornamental crops of zingiberaceae, heliconias, and palms with different agricultural management practices and a remnant of forest in Ixtaczoquitlán, Veracruz, Mexico. A total of 965 ant workers belonging to 37 species, 25 genera, 16 tribes, and seven subfamilies was collected. Richness, diversity and evenness of species decreased significantly as the degree of management and agricultural intensification increased. The myrmecofauna composition from the forest was significantly different from that found in the three ornamental crops. The impact of ornamental horticulture on biodiversity may be due to farm management. Excessive use of agrochemicals generates local loss of species diversity. Ornamental crops with low intensification of agricultural management could represent a habitat that offers resources and conditions to different ant guilds and other invertebrates.

Prevention of the development of polluting characteristics in cooking water residue from nixtamalisation of corn by removing solid lime particles

1 Colegio de Postgraduados – Campus C ordoba, Programa de Innovaci on Agroalimentaria Sustentable, Km. 348 Carr. Fed. C ordobaVeracruz, Amatl an de los Reyes, Veracruz, C.P. 94946, Mexico 2 School of Nutrition and Food Sciences, Agricultural Center, Louisiana State University, Baton Rouge, LA 70803-4200, USA 3 Centro de Investigaci on y de Estudios Avanzados del I.P.N, Unidad Quer etaro, Libramiento Norponiente No. 2000, Fracc. Real de Juriquilla, Quer etaro, Qro, C.P. 76230, Mexico 4 Facultad de Ciencias Biol ogicas y Agropecuarias, Universidad Veracruzana, Regi on Orizaba-C ordoba, Camino Pe~ nuela-Amatl an s/n, Municipio de Amatl an de los Reyes, Veracruz, C.P. 94945, Mexico 5 Facultad de Ciencias Qu ımicas, Laboratorio de Gesti on y Control Ambiental, Universidad Veracruzana, Orizaba, Ver, 94340, Mexico

New State-Wide Records of Ant Species Collected in Tizatlan Botanical Garden, Tlaxcala, Tlaxcala, Mexico

Summary With the goal of increasing the known myrmecofauna of the state of Tlaxcala, Mexico, specimens were collected in soil and shrub vegetation using different collecting techniques. Seventeen species belonging to 14 genera, 10 tribes and 5 subfamilies are reported for the first time increasing the total number of species known to occur in Tlaxcala to 20, genera to 17, and tribes to 12. These results demonstrate the scarcity of knowledge regarding the myrmecofauna of Tlaxcala state. Systematic sampling is recommended to further the knowledge of species inhabiting this region of Mexico.