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17 resultados encontrados para: AUTOR: Mora, Miguel A.
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1.
- Artículo con arbitraje
*Solicítelo con su bibliotecario/a
Carbon sequestration potential of second-growth forest regeneration in the Latin American tropics
Chazdon, Robin L. (coaut.) ; Broadbent, Eben N. (coaut.) ; Rozendaal, Danaë M. A. (coaut.) ; Bongers, Frans (coaut.) ; Almeyda Zambrano, Angélica M. (coaut.) ; Aide, T. Mitchell (coaut.) ; Balvanera, Patricia (coaut.) ; Becknell, Justin M. (coaut.) ; Boukili, Vanessa (coaut.) ; Brancalion, Pedro H. S. (coaut.) ; Craven, Dylan (coaut.) ; Almeida Cortez, Jarcilene Silva (coaut.) ; Cabral, George A. L. (coaut.) ; De Jong, Bernardus Hendricus Jozeph (coaut.) ; Denslow, Julie S. (coaut.) ; Dent, Daisy H. (coaut.) ; DeWalt, Saara J. (coaut.) ; Dupuy, Juan M. (coaut.) ; Durán, Sandra M. (coaut.) ; Espírito Santo, Mario M. (coaut.) ; Fandino, María C. (coaut.) ; César, Ricardo G. (coaut.) ; Hall, Jefferson S. (coaut.) ; Hernández Stefanoni, José Luis (coaut.) ; Jakovac, Catarina C. (coaut.) ; Junqueira, André B. (coaut.) ; Kennard, Deborah (coaut.) ; Letcher, Susan G. (coaut.) ; Lohbeck, Madelon (coaut.) ; Martínez Ramos, Miguel (coaut.) ; Massoca, Paulo (coaut.) ; Meave, Jorge A. (coaut.) ; Mesquita, Rita (coaut.) ; Mora Ardila, Francisco (coaut.) ; Muñoz, Rodrigo (coaut.) ; Muscarella, Robert (coaut.) ; Nunes, Yule R. F. (coaut.) ; Ochoa Gaona, Susana (coaut.) ; Orihuela Belmonte, Dolores Edith (coaut.) ; Peña Claros, Marielos (coaut.) ; Pérez García, Eduardo A. (coaut.) ; Piotto, Daniel (coaut.) ; Powers, Jennifer S. (coaut.) ; Rodríguez Velázquez, Jorge (coaut.) ; Romero Pérez, Isabel Eunice (coaut.) ; Ruíz, Jorge (coaut.) ; Saldarriaga, Juan G. (coaut.) ; Sánchez Azofeifa, G. Arturo (coaut.) ; Schwartz, Naomi B. (coaut.) ; Steininger, Marc K. (coaut.) ; Swenson, Nathan G. (coaut.) ; Uriarte, María (coaut.) ; van Breugel, Michiel (coaut.) ; Van Der Wal, Hans (coaut.) ; Veloso, María D. M. (coaut.) ; Vester, Hans (coaut.) ; Vieira, Ima Celia G. (coaut.) ; Vizcarra Bentos, Tony (coaut.) ; Williamson, G. Bruce (coaut.) ; Poorter, Lourens (coaut.) ;
Contenido en: Science Advances Vol. 2, no. 5, e1501639 (May 2016), p. 1-10 ISSN: 2375-2548
Nota: Solicítelo con su bibliotecario/a
Resumen en: Inglés |
Resumen en inglés

Regrowth of tropical secondary forests following complete or nearly complete removal of forest vegetation actively stores carbon in aboveground biomass, partially counterbalancing carbon emissions from deforestation, forest degradation, burning of fossil fuels, and other anthropogenic sources. We estimate the age and spatial extent of lowland second-growth forests in the Latin American tropics and model their potential aboveground carbon accumulation over four decades. Our model shows that, in 2008, second-growth forests (1 to 60 years old) covered 2.4 million km² of land (28.1%of the total study area).Over 40 years, these lands can potentially accumulate a total aboveground carbon stock of 8.48 Pg C (petagrams of carbon) in aboveground biomass via low-cost natural regeneration or assisted regeneration, corresponding to a total CO2 sequestration of 31.09 Pg CO2. This total is equivalent to carbon emissions from fossil fuel use and industrial processes in all of Latin America and the Caribbean from1993 to 2014. Ten countries account for 95% of this carbon storage potential, led by Brazil, Colombia, Mexico, and Venezuela. We model future land-use scenarios to guide national carbon mitigation policies. Permitting natural regeneration on 40% of lowland pastures potentially stores an additional 2.0 Pg C over 40 years. Our study provides information and maps to guide national-level forest-based carbon mitigation plans on the basis of estimated rates of natural regeneration and pasture abandonment. Coupled with avoided deforestation and sustainable forestmanagement, natural regeneration of second-growth forests provides a low-costmechanism that yields a high carbon sequestration potential with multiple benefits for biodiversity and ecosystem services.


2.
Tesis - Doctorado
Variación de la Colinesterasa plasmática en Turdus grayi en condiciones normales y por exposición a diazinón / Víctor Manuel Cobos Gasca
Cobos Gasca, Víctor Manuel ; Escalona Segura, Griselda (tutora) ; Mora, Miguel A. (asesor) ; Jiménez Osornio, Juan José María (asesor) ; Calmé, Sophie (asesora) ;
San Francisco de Campeche, Campeche, México : El Colegio de la Frontera Sur , 2006
Clasificación: TE/598.809726 / C6
Cerrar
SIBE Campeche
ECO040002998 (Disponible)
Disponibles para prestamo: 1
Cerrar
SIBE Chetumal
ECO030006676 (Disponible)
Disponibles para prestamo: 1
Cerrar
SIBE San Cristóbal
ECO010010623 (Disponible)
Disponibles para prestamo: 1
Cerrar
SIBE Tapachula
ECO020011158 (Disponible)
Disponibles para prestamo: 1
Cerrar
SIBE Villahermosa
ECO050003184 (Disponible)
Disponibles para prestamo: 1
Resumen en español

El uso de plaguicidas organofosforados en la agricultura trae como consecuencia que las aves que forrajean en los cultivos se puedan intoxicar con estas sustancias. El diagnóstico de exposición a estas sustancias, mediante la determinación de la actividad enzimática, es un bioindicador de exposición muy sensible. Uno de los insecticidas ampliamente utilizado en la agricultura es el diazinón. Los objetivos del presente trabajo fueron; evaluar el impacto de la aplicación de diazinón en cultivos de papaya en la actividad de la colinesterasa del zorzal pardo (Turdus grayi), evaluar la variación diurna y estacional de la actividad, y la variación debida a la intoxicación con diazinón, tomando en cuenta el peso y el sexo del ave. Para ello se capturaron mediante trampas, 22 individuos de zorzal pardo, forrajeando en un cultivo de papaya en la unidad agrícola de Yaaxhóm, Yuc., en los meses de marzo y mayo, al día siguiente de haber sido fumigado. Además, se capturaron 20 individuos machos en una zona de la Península de Yucatán con poca actividad agrícola, en dos épocas del año, primavera y otoño, los cuales se utilizaron como grupo control y experimental. Dichos individuos se marcaron, se pesaron, se les determinó el sexo y se aclimataron. Se colocaron en jaulas en grupos de cinco y con ellos se evaluó la variación diurna y estacional de la colinesterasa, y la inhibición de la actividad enzimática debida a la intoxicación con una dosis única de diazinón. A las aves se les tomó una muestra de sangre de la vena braquial y se les determinó la actividad enzimática de acuerdo a la técnica de Hill y Fleming.

Los resultados obtenidos revelan que la actividad enzimática de los machos fue mayor que la de las hembras (53.52%), la inhibición promedio de la colinesterasa fue de 49.43% en el mes de mayo, no se encontraron diferencias significativas en la variación diurna de la colinesterasa y se observó un valor de inhibición del 73% para la dosis de 1.5 mg/kg de diazinón. El conocimiento de factores tales como peso y sexo del ave, así como la variación diurna de la actividad, y el comportamiento y los hábitos alimentarios de esta especie, nos indican que el zorzal pardo sería un buen indicador de la contaminación por plaguicidas organofosforados tanto en cultivos frutícolas.

Índice

Resumen
Introducción
Los Plaguicidas organofosforados
Las aves passeriformes
Antecedentes
Variación de la actividad enzimática
Inhibición de la actividad enzimática
Uso de plaguicidas en yucatán
Objetivos
Métodos
Objeto experimental
Fase inicial
Fase experimental
Fase decampo
Determinación de la actividad enzimática
Análisis de datos
Resultados
Artículo publicado en la Revista de Toxicología
Artículo enviado a la revista Ecotoxicology
Conclusiones
Literatura Citada
Anexos
Anexo 1. Insecticidas organofosforados mas utilizados en la Peninsula de Yucatán
Anexo 2. Valores de peso, pendiente y la actividad enzimática de individuos de Turdus grayi capturados en marzo en un cultivo de papaya maradoi en la Unidad Agricola de Yaxhom, Oxcutcab, Yuc
Anexo 3. Valores del peso y actividad enzimática de machos de Turdus grayi capturados en dos meses del año
Figuras
Figura 1. Transmision del impulso nervioso
Figura 2. Mapa de la ubicacion de los sitios de muestreo y de la colecta de aves para experimentación
Apendice
Apéndice 1. Instrucciones para los autores de la Revista de Toxicología
Apéndice 2. Instrucciones para los autores de la revista Ecotoxicology


3.
Libro

4.
Libro
Memorias del XXXIII congreso nacional de entomología
Congreso Nacional de Entomología (33 : 1998 : Acapulco, Guerrero, México) ;
Distrito Federal, México : Sociedad Mexicana de Entomología , 1998
Clasificación: 595.70972 / C6/1998
Bibliotecas: San Cristóbal , Tapachula
Cerrar
SIBE San Cristóbal
ECO010005646 (Disponible)
Disponibles para prestamo: 1
Cerrar
SIBE Tapachula
ECO020001927 (Disponible) , ECO020002545 (Disponible)
Disponibles para prestamo: 2

Resumen en: Inglés |
Resumen en inglés

The Mediterranean fruit fly, Ceratitis capitata (Wiedemann) (Diptera: Tephritidae), is considered one of the most important pests worldwide because of its direct damage to fruit and vegetable production, and restrictions imposed to commercialization of horticultural commodities by countries free of the pest. It was introduced to Brazil in 1901 and to Costa Rica in 1955, from where it spread across the Central American region, reaching Guatemala and Mexico in 1976 and 1977, respectively. In response, the governments of Guatemala, Mexico, and the USA joined efforts to (1) contain further northward spread of the pest, (2) eradicate it from the areas it had invaded in southernMexico, and (3) in the longer termeradicate it from Guatemala and eventually from the rest of Central America. To this effect, cooperative agreements were subscribed between the three countries and also between the USA and Belize. This allowed regional cooperation against the Mediterranean fruit fly and the creation of the Moscamed Programme. The programme was the first area-wide large-scale application of the sterile insect technique (SIT) against this pest. By 1982, the Programme had achieved its first two objectives with the containment of the northward advance of the pest, and its eradication from the areas it had invaded in the states of Chiapas and Oaxaca in southern Mexico. Furthermore, by 1985 the Mediterranean fruit fly had been eradicated from areas in Guatemala located at the border with Mexico. Since then, the programme has had years with significant territorial advances in the eradication of the pest from areas within Guatemala, combined with years when it had setbacks resulting in losses of the territorial gains. Nevertheless, during 4 decades, the programme has effectively served as an effective containment barrier maintaining the Mediterranean fruit fly-free status of Belize, Mexico, and the USA.

It has also protected and increased the Mediterranean fruit fly-free areas in Guatemala. As a result, it has protected the assets of horticultural producers and contributed during this period to the development of multibillion dollar export industries in these countries. This paper provides an historical review of the programme and describes briefly how technological innovations and decision-making tools have contributed to programme efficiency. It also discusses how non-technical and external factors have limited the eradication process and further programme advance within the Central American region.


6.
Artículo
*En hemeroteca, SIBE-San Cristóbal
Los sismos de septiembre y la salud en México
Frenk Mora, Julio José (1953-) ; González, Miguel A. (coaut.) ; Sepúlveda Amor, Jaime (coaut.) ;
Contenido en: Estudios Demográficos y Urbanos Vol. 2 , no. 1 (enero-abril 1987), p. 121-139 ISSN: 0186-7210
Bibliotecas: San Cristóbal
Cerrar
SIBE San Cristóbal
B9244 (Disponible)
Disponibles para prestamo: 1
Nota: En hemeroteca, SIBE-San Cristóbal

7.
- Artículo con arbitraje
Legume abundance along successional and rainfall gradients in Neotropical forests
Gei, Maga ; Rozendaal, Danaë M. A. (coaut.) ; Poorter, Lourens (coaut.) ; Bongers, Frans (coaut.) ; Sprent, Janet I. (coaut.) ; Garner, Mira D. (coaut.) ; Aide, T. Mitchell (coaut.) ; Andrade, José Luis (coaut.) ; Balvanera, Patricia (coaut.) ; Becknell, Justin M. (coaut.) ; Brancalion, Pedro H. S. (coaut.) ; Cabral, George A. L. (coaut.) ; Gomes César, Ricardo (coaut.) ; Chazdon, Robin L. (coaut.) ; Cole, Rebecca J. (coaut.) ; Dalla Colletta, Gabriel (coaut.) ; De Jong, Bernardus Hendricus Jozeph (coaut.) ; Denslow, Julie S. (coaut.) ; Dent, Daisy H. (coaut.) ; DeWalt, Saara J. (coaut.) ; Dupuy, Juan Manuel (coaut.) ; Durán, Sandra M. (coaut.) ; do Espírito Santo, Mário Marcos (coaut.) ; Fernandes, G. Wilson (coaut.) ; Ferreira Nunes, Yule Roberta (coaut.) ; Finegan, Bryan (coaut.) ; Granda Moser, Vanessa (coaut.) ; Hall, Jefferson S. (coaut.) ; Hernández Stefanoni, José Luis (coaut.) ; Junqueira, André B. (coaut.) ; Kennard, Deborah (coaut.) ; Lebrija Trejos, Edwin (coaut.) ; Letcher, Susan G. (coaut.) ; Lohbeck, Madelon (coaut.) ; Marín Spiotta, Erika (coaut.) ; Martínez Ramos, Miguel (coaut.) ; Meave, Jorge A. (coaut.) ; Menge, Duncan N. L. (coaut.) ; Mora Ardila, Francisco (coaut.) ; Muñoz, Rodrigo (coaut.) ; Muscarella, Robert (coaut.) ; Ochoa Gaona, Susana (coaut.) ; Orihuela Belmonte, Dolores Edith (coaut.) ; Ostertag, Rebecca (coaut.) ; Peña Claros, Marielos (coaut.) ; Pérez García, Eduardo A. (coaut.) ; Piotto, Daniel (coaut.) ; Reich, Peter B. (coaut.) ; Reyes García, Casandra (coaut.) ; Rodríguez Velázquez, Jorge (coaut.) ; Romero Pérez, Isabel Eunice (coaut.) ; Sanaphre-Villanueva, Lucía (coaut.) ; Sánchez Azofeifa, Arturo (coaut.) ; Schwartz, Naomi B. (coaut.) ; Silva de Almeida, Arlete (coaut.) ; Almeida Cortez, Jarcilene Silva (coaut.) ; Silver, Whendee L. (coaut.) ; de Souza Moreno, Vanessa (coaut.) ; Sullivan, Benjamin W. (coaut.) ; Swenson, Nathan G. (coaut.) ; Uriarte, María (coaut.) ; van Breugel, Michiel (coaut.) ; Van Der Wal, Hans (coaut.) ; Magalhães Veloso, Maria Das Dores (coaut.) ; Vester, Hans F. M. (coaut.) ; Guimarães Vieira, Ima Célia (coaut.) ; Zimmerman, Jess K. (coaut.) ; Powers, Jennifer S. (caout.) ;
Contenido en: Nature Ecology and Evolution Vol. 2, no. 7 (Jun. 2018), p. 1104–1111 ISSN: 2397-334X
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Resumen en: Inglés |
Resumen en inglés

The nutrient demands of regrowing tropical forests are partly satisfied by nitrogen-fixing legume trees, but our understanding of the abundance of those species is biased towards wet tropical regions. Here we show how the abundance of Leguminosae is affected by both recovery from disturbance and large-scale rainfall gradients through a synthesis of forest inventory plots from a network of 42 Neotropical forest chronosequences. During the first three decades of natural forest regeneration, legume basal area is twice as high in dry compared with wet secondary forests. The tremendous ecological success of legumes in recently disturbed, water-limited forests is likely to be related to both their reduced leaflet size and ability to fix N2, which together enhance legume drought tolerance and water-use efficiency. Earth system models should incorporate these large-scale successional and climatic patterns of legume dominance to provide more accurate estimates of the maximum potential for natural nitrogen fixation across tropical forests.


8.
- Artículo con arbitraje
*Solicítelo con su bibliotecario/a
Effects of long-term inter-annual rainfall variation on the dynamics of regenerative communities during the old-field succession of a neotropical dry forest
Martínez Ramos, Miguel ; Balvanera, Patricia (coaut.) ; Arreola Villa, Felipe (coaut.) ; Mora Ardila, Francisco (coaut.) ; Maass, José Manuel (coaut.) ; Maza Villalobos Méndez, Susana (coaut.) ;
Contenido en: Forest Ecology and Management Vol. 426, (October 2018), p. 91-100 ISSN: 0378-1127
Nota: Solicítelo con su bibliotecario/a
Resumen en: Inglés |
Resumen en inglés

Effects of long-term rainfall inter-annual variation on regeneration dynamics of tropical dry forests (TDF) are still poorly understood. Such understanding is particularly important to assess the regeneration potential of TDF in landscapes subjected to slash-and-burn farming management. Here, we studied from 2004 to 2016 the effects of inter-annual rainfall variation on the dynamics of regenerative communities of woody species during the old-field succession of a TDF in Western Mexico. Over the study period a severe drought, caused by an El Niño Southern Oscillation (ENSO) event in 2005, and two hurricanes (Jova, 2011, magnitude 2; Patricia, 2015, magnitude 4) were experienced. In 2004, we established a chronosequence of abandoned cattle pastures and old-growth forest sites, which were assigned to four successional categories, each one with three sites: Pasture (0–3 years fallow age), Early (3–5 years), Intermediate (8–12 years), and Old-Growth Forest (without any human disturbance). At each site, seedlings, saplings and resprouts 10–100 cm height of shrub and tree species were tagged, taxonomically identified, measured in height and monitored over 12 continuous year intervals. At each year, all new plants reaching 10 cm height were recorded and considered as recruits. Community rates (recruitment, relative growth rate in height, mortality, species gain and species loss) were calculated per year, considering all plants combined and separating shrub from tree species. All community rates varied notoriously in response to temporal rainfall variability, with almost null interaction with successional category. As expected, mortality and species loss rates declined as the amount of rainfall increased, especially when precipitation of the current and the previous year were taken into account; these rates peaked in the ENSO year and were still high in the following year.

Unexpectedly, recruitment and species gain rates also declined with the increase in rainfall, especially with the amount of rainfall in the current year. Overall, community rates of tree species were more responsive than those of shrub species to temporal rainfall variation. The ENSO-related drought event produced a short and transient instability in the plant density and species density of regenerative communities. However, ENSO effects were smoothed out by subsequent rainy years, leading to a net increase in plant density and species density in all successional categories, especially in the younger one. Overall, our study shows that global (e.g. ENSO) and regional (e.g. storms, hurricanes) climate factors play a key role on forest succession, modulating the speed of the TDF regeneration dynamics. We conclude that low impact agricultural land use and the presence of good levels of remnant forest cover in the landscape confers a high potential for regeneration in abandoned agricultural fields, even under the impact of severe droughts and severe hurricanes.


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Resumen en: Inglés |
Resumen en inglés

Agave tequilana Weber var. 'Azul' is grown for the production of tequila, inulin and syrup. Diverse bacteria inhabit plant tissues and play a crucial role for plant health and growth. In this study culturable endophytic bacteria were extracted from leaf bases of 100 healthy Agave tequilana plants. In plant tissue bacteria occurred at mean population densities of 3 million CFU/g of fresh plant tissue. Three hundred endophytic strains were isolated and 16s rDNA sequences grouped the bacteria into eight different taxa that shared high homology with other known sequences. Bacterial endophytes were identified as Acinectobacter sp., A. baumanii, A. bereziniae, Cronobacter sakazakii, Enterobacter hormaechei, Bacillus sp. Klebsiella oxytoca, Pseudomonas sp., Enterococcus casseliflavus, Leuconostoc mesenteroides subsp. mesenteroides and Gluconobacter oxydans. Isolates were confirmed to be plant growth promoting bacteria (PGPB) by their capacities for nitrogen fixation, auxin production, phosphate solubilization, or antagonism against Fusarium oxysporum AC132. E. casseliflavus JM47 and K. oxytoca JM26 secreted the highest concentrations of IAA. The endophyte Acinectobacter sp. JM58 exhibited the maximum values for nitrogen fixation and phosphate solubilization index (PSI). Inhibition of fungi was found in Pseudomonas sp. JM9p and K. oxytoca JM26. Bacterial endophytes show promise for use as bio-inoculants for agave cultivation. Use of endophytes to enhance cultivation of agave may be particularly important for plants produced by micropropagation techniques, where native endophytes may have been lost.


10.
Libro
Entomología mexicana 2004 / editores Alberto Morale Moreno, Marcela Ibarra González, Andrea del Pilar Rivera González, Sergio Stanford Camargo
Morales Moreno, Alberto (ed.) ; Ibarra González, Marcela (coed.) ; Rivera González, Andrea del Pilar (coed.) ; Stanford Camargo, Sergio (coed.) ;
México : Colegio de Postgraduados :: Sociedad Mexicana de Entomología , 2004
Clasificación: 595.7 / C6/2004
Bibliotecas: Tapachula
Cerrar
SIBE Tapachula
ECO020013880 (Disponible)
Disponibles para prestamo: 1