ISSN: 2310-2799
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546,196 artículos
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Año:
2002
ISSN:
2448-8445, 0065-1737
Romero Nápoles, Jesús; Ayers, Tina J.; Johnson, Clarence Dan
Instituto de Ecología, A.C.
Resumen
A preliminary cladistic analysis of forty species of Amblycerus Thunberg is presented based on 29 morphological characters. The analysis generated four equally parsimonious trees of 60 steps in length with a consistency index of 0.63 and a retention index of 0.88. By replacing host families by each species of Amblycerus on the cladogram, an approximation of macroevolution into host taxa was formulated. These bruchids appear to have moved from the plant family Fabaceae into 12 other plant families, with many species into the families Sterculiaceae and Boraginaceae. Various factors including oviposition behavior are cited for some host shifts. Plant chemistry is especially important but we only have correlative data to support these conclusions. To us, it appears that the most parsimonious explanation for the host shifts that we observed was by macroevolution during enhanced rates of bruchid diversification in the Recent epoch.
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Año:
2002
ISSN:
2448-8445, 0065-1737
Márquez Olivas, Marcelo
Instituto de Ecología, A.C.
Resumen
La rata magueyera (Neotoma albigula) se usa como alimento en las comunidades rurales del Altiplano Potosino-Zacatecano. Las formas de captura de este roedor disminuyen sus poblaciones y destruyen continuamente su hábitat. Para revertir esta tendencia destructiva y proponer otras formas de su aprovechamiento, en el Colegio de Postgraduados (Campus San Luis Potosí), se hizo de 1993 a 1995 el presente estudio con los siguientes objetivos: 1) determinar el ciclo estral de la rata magueyera con base en cambios celulares de su epitelio vaginal y 2) describir su conducta asociada a la reproducción. El ciclo estral se presentó en promedio cada 5.21 días y el número de estros por rata, en 30 días, fue de 4.6. El macho montó a la hembra de dos a cinco veces cada 4.8 minutos y permaneció sobre ella 25 segundos.
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Año:
2002
ISSN:
2448-8445, 0065-1737
Coronado Blanco, Juana María; Ruíz-Cancino, Enrique
Instituto de Ecología, A.C.
Resumen
The presence of Rhopalosoma simile Brues (Hymenoptera: Rhopalosomatidae) in the State of Tamaulipas, México, is recorded.
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Año:
2002
ISSN:
2448-8445, 0065-1737
Extensión austral a la distribución conocida de Micoureus constantiae (Didelphimorphia, Didelphidae)
Flores, David A.; Díaz, M. Mónica
Instituto de Ecología, A.C.
Resumen
The distribution of Micoureus constantiae is extended about 350 km south of the southernmost previously known record. Two new localities are added to the distribution of the species in Salta and Tucumán provinces, Argentina. It is registered for the first time in Tucumán Province.
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Año:
2002
ISSN:
2448-8445, 0065-1737
Correa Sandoval, Alfonso; Rodríguez Castro, Rubén
Instituto de Ecología, A.C.
Resumen
Cuarenta y seis géneros, 102 especies y 11 subespecies de gastrópodos terrestres pertenecientes a 24 familias se registran para la región sur del estado de Tamaulipas. Treinta y tres especies son nuevos registros. Las familias con más especies son Spiraxidae (18), Polygyridae (11) y Helicinidae (10). Las especies con mayor distribución por localidades son Praticolella berlandieriana y Helicina chrysocheila. Tomando en cuenta los registros del norte del estado se conocen en total 105 especies para Tamaulipas.
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Año:
2002
ISSN:
2448-7589, 0187-7151
Cuevas Guzmán, Ramón; López-Mata, Lauro; García Moya, Edmundo
Instituto de Ecología, A.C.
Resumen
Desmopsis trunciflora is recorded for the first time from the state of Jalisco, where it grows in the transition between montane cloud forest and tropical subdeciduous forest. A morphological comparison was done with D. mexicana R. E. Fries, the species most related with. A study of the species population structure and the community where it grows showed that out of 56 plots surveyed (0.1 ha each) along an altitudinal gradient ranging from 550 to 1,850 m, the species was present in only 11 at altitudes between 850 and 1,450 m. Desmopsis trunciflora is a typical shade-tolerant species coexisting in the understorey with a reverse J-shaped population structure. Presence of D. trunciflora is positively correlated with the percentage of rock cover and the superficial horizon depth of soil in the area, based on a Canonical Correspondence Analysis.
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Año:
2002
ISSN:
2448-7589, 0187-7151
Pérez-Calix, Emmanuel; García Ruiz, Ignacio
Instituto de Ecología, A.C.
Resumen
Sedum neovolcanicum is described as new species, based on plants collected in the western portion of the geographical region known as the Trans-Mexican Volcanic Belt, in the states of Jalisco and Michoacán. The new taxon resembles Sedum bourgaei Hemsl., S. tortuosum Hemsl. and S. multiflorum R. T. Clausen in possessing white or rosy-white flowers. However, it is distinguished from these species by its habit, number of flowers per inflorescence, unbranched inflorescence, and petals and sepals length.
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Año:
2002
ISSN:
2448-7589, 0187-7151
Ramos Álvarez, Clara Hilda; Diego-Pérez, Nelly
Instituto de Ecología, A.C.
Resumen
Fuirena stephani sp. nov., is described from plants collected in the state of Campeche, Mexico. F. stephani can be distinguished from F. robusta Kunth, by the shape of the outer perianth set. It is known at present only from one locality.
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Año:
2002
ISSN:
2448-7589, 0187-7151
Ocampo Acosta, Gilberto
Instituto de Ecología, A.C.
Resumen
Portulaca guanajuatensis is described as a new species. It is only known from the type locality, in the municipality of Iturbide, state of Guanajuato, Mexico. It belongs to section Portulaca of subgenus Portulaca and is distinguished mainly by its perennial habit with napiform root as well as by its red style.
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Año:
2002
ISSN:
2448-7589, 0187-7151
de Luna, Efraín; Ussher Miozzo, María Silvina; Cobos Acosta, Raquel
Instituto de Ecología, A.C.
Resumen
As a result of field trips during the first “Tropical Bryology” course of the Red Latinoamericana de Botánica, we collected two species of Polytrichaceae that are new to the moss flora of Costa Rica and Central America: Steereobryon subulirostrum (Schimp. ex Besch.) G. L. Sm. and Pogonatum pensilvanicum (Hedw.) P. Beauv. The former taxon represents also a genus previously not known from Central America. In this connection we provide two identification keys, one for the genera of Polytrichaceae, and another for species of Pogonatum in Costa Rica.
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