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Ciudad Victoria, Mexico

Guevara-Carrizales A.A.,Autonomous University of Baja California | Martinez-Gallardo R.,Autonomous University of Baja California | Moreno-Valdez A.,Instituto Tecnologico Of Cd Victoria
Revista Mexicana de Biodiversidad | Year: 2010

We report the first record of a colony of the phillostomid bat Leptonycteris curasoae for Baja California, Mexico. This region represents the second locality reported for this species in the state.

Vahed K.,University of Derby | Gilbert J.D.J.,University of Sussex | Weissman D.B.,California Academy of Sciences | Barrientos-Lozano L.,Instituto Tecnologico Of Cd Victoria
Evolution | Year: 2014

The function of nuptial gifts has generated longstanding debate. Nuptial gifts consumed during ejaculate transfer may allow males to transfer more ejaculate than is optimal for females. However, gifts may simultaneously represent male investment in offspring. Evolutionary loss of nuptial gifts can help elucidate pressures driving their evolution. In most katydids (Orthoptera: Tettigoniidae), males transfer a spermatophore comprising two parts: the ejaculate-containing ampulla and the spermatophylax-a gelatinous gift that females eat during ejaculate transfer. Many species, however, have reduced or no spermatophylaces and many have prolonged copulation. Across 44 katydid species, we tested whether spermatophylaces and prolonged copulation following spermatophore transfer are alternative adaptations to protect the ejaculate. We also tested whether prolonged copulation was associated with (i) male cercal adaptations, helping prevent female disengagement, and (ii) female resistance behavior. As predicted, prolonged copulation following (but not before) spermatophore transfer was associated with reduced nuptial gifts, differences in the functional morphology of male cerci, and behavioral resistance by females during copulation. Furthermore, longer copulation following spermatophore transfer was associated with larger ejaculates, across species with reduced nuptial gifts. Our results demonstrate that nuptial gifts and the use of grasping cerci to prolong ejaculate transfer are functionally equivalent. © 2014 The Society for the Study of Evolution.

Dias-Guerra W.,University of Brasilia | Carla De Oliveira P.,Federal University of Mato Grosso | Barrientos-Lozano L.,Instituto Tecnologico Of Cd Victoria
Journal of Orthoptera Research | Year: 2010

We reared Baeacris punctulatus (Orthoptera: Acrididae) in cages under seminatural conditions in Cuiabá, Mato Grosso, Brazil. Five nymphal instars were recorded. One generation required ∼ 82 d (24 d egg stage + 43 d nymphal development + 15 d preoviposition period). Colony females laid ∼ 4.4 egg pods during their ∼ 30-d adult life. Pods contained ∼ 13 eggs, and most eggs hatched, giving ∼ 56 offspring per female. Survival during the nymphal stage was 38.9%, with highest mortality in 4th-5 th instars. Average and maximum lifespans from hatch to adult death were 73 and 80 d, respectively. Field sampling in Campo Novo do Parecis and Parecis Plateau regions of Brazil showed that adults and older nymphs were present in all months of the year, but that oviposition and young nymphs were scarce during the dry-cool months of May to mid-August. Overall, our study suggests that in the State of Mato Grosso, there are 3.9 to 5.1 generations per year. The various instars could be differentiated by the number of antennal segments, body size, and shape and size of wing pads. Annual and regional variation in temperature and moisture may influence the life history and population dynamics of B. punctulatus.

Guevara G.,Instituto Tecnologico Of Cd Victoria | Bonito G.,Duke University | Cazares E.,Oregon State University
Revista Mexicana de Biodiversidad | Year: 2013

Species in the genus Tuber have received little taxonomic attention in Mexico, despite its great ecological and economic importance. Only 10 species have been described for Mexico. In this study, Tuber canaliculatum, T. gibbosum, and T. malacodermum are described for the first time for the Mexican mycobiota. These species are distinguished by a combination of morphological and ecological characteristics. Illustarations and a dichotomic key are presented for the known described species from Mexico.

Rodriguez H.H.,Polytechnic University of Guanajuato | Maldonado-Reyes A.,Instituto Tecnologico Of Cd Victoria | Cortes-Hernandez D.A.,CINVESTAV
Journal of Applied Research and Technology | Year: 2011

This work consisted in the development and characterization of a vitroceramic coating on 316L stainless steel by means of electrophoretic deposition (EPD). This vitroceramic coating was obtained through a Si-, Ca-rich glass coating crystallization. The electrophoretic deposition tests were performed on 316L stainless steel mechanically polished substrates. The results suggest that the electrophoretic coatings adhered well to the metallic surfaces. The results demonstrate that the crystallized coatings are potentially bioactive, because a dense and homogeneous apatite layer, similar to a bone, makes up.

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