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54 resultados encontrados para: TEMA: Sedimentos fluviales
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Directorio de participantes
Parte 1. Gobernanza Adaptativa
1. Diseño de la gobernanza costera
2. Análisis y evaluación gubernamental de mares y costas en México: hacia una evaluación integral
3. Formación educativa para los gestores en la solución de problemas en las áreas costeras de México. Entre la formación en programas de licenciatura y los programas de posgrado o especialidad
4. Resiliencia costera: elementos para su instrumentación
5. Gobernanza ambiental ante el cambio climático: municipios costeros de México
6. Elementos para la gobernanza del agua ante la vulnerabilidad a la sequía y el cambio climático: cuencas hidrológicas con destino turístico de Baja California Sur
7. Adaptabilidad y transformaciones en el lago de Chapala. Retos para la gobernanza y el manejo de los cuerpos de agua epicontinentales
8. Frente a la variabilidad del clima: riesgo y vulnerabilidad en las zonas costeras
9. Análisis comparado de los impactos económicos y sociales ante el cambio climático en municipios costeros del noreste del golfo de México
10. Playas recreativas de México: vulnerabilidad y gestión
11. Situación jurídica para el manejo de los ecosistemas arrecifales de México
12. Energía limpia y uso del suelo en las costas mexicanas: escenarios y costo de oportunidad
13. Las energías renovables en las costas
14. Evaluación del impacto social de los proyectos de generación de energía eléctrica: propuesta metodológica para la construcción de los índices de la línea base
15. Costos ambientales y económicos no internalizados por la generación de energía eléctrica limpia: servicios ecosistémicos vs condicionantes ambientales
16. Las dunas costeras y zofemat: un vínculo necesario para fortalecer la gestión de las costas
17. Experiencias sobre la gestión sustentable de las costas y playas de isla Cozumel, México
18. Plásticos y basura en las zonas costeras y los océanos

19. Análisis de vulnerabilidad y gestión de riesgo por inundación en áreas de cuencas
20. Impacto socioambiental de la erosión costera. El caso de Chiapas
21. Panarquia: propuesta de análisis de la dinámica costera de Tabasco ante el cambio global
22. Vulnerabilidad y riesgo socioambiental en localidades del Área Natural Protegida Laguna de Términos, Campeche, México
23. La Agencia Mexicana de Mares y Costas: estrategia para el desarrollo socioeconómico de los mares y costas mexicanas
24. Reducción del riesgo por desastres: breve descripción del FOPREDEN y el FONDEN en el contexto del modelo FMPEIR y de la gobernanza
Parte 2. Gobernanza Ambiental
25. La variabilidad climática en las zonas costeras
26. Ecosistemas costeros complejos
27. Ecosistemas marinos complejos
28. Importancia del monitoreo costero para la construcción de la resiliencia
29. Anomalías climáticas futuras en una cuenca hidrológica costera del Golfo de México: impacto de escenarios de cambio climático
30. Cambio temporal en los sedimentos de las playas del sur del estado de Campeche: una herramienta para la toma de decisiones
31. Evaluación de inundación costera debido al incremento del nivel del mar en Ensenada, Baja California, México
32. Humedales costeros de agua dulce y bases para su gobernanza
33. Restauración ecológica de manglares de México
34. Almacenes de carbono en los manglares de Centla, Tabasco, asociado a gradientes ambientales y grado de conservación
35. Biomarcadores: una herramienta para medir y predecir los efectos del cambio climático sobre los peces y su aplicación en la toma de decisiones
36. Pautas para la conservación y manejo de impactos ambientales en pastos marinos
37. El sargazo en el Caribe mexicano, revisión de una historia impensable
38. Evaluaciones de impacto ambiental y su coincidencia con hábitats de tortugas marinas en la península de Yucatán, México

39. El papel de los Programas de Acción para la Conservación de Especies (PACE) en el manejo y restauración de especies y ecosistemas del sureste de México
40. Pesquerías y variabilidad ambiental vs gobernanza, algunas reflexiones
41. Situación actual de conservación y manejo de meros y pargos en el sureste del golfo de México y mar Caribe Mexicano
42. La necesidad en México de generar un marco regulatorio para el uso de aditivos probióticos en la acuicultura costera


2.
Artículo
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Spatial and temporal habitat use by Penaeid shrimp (Decapoda: Penaeidae) in a coastal lagoon of the southwestern Gulf of Mexico
Torres Velázquez, Jony Ramiro (autor) ; Sánchez Martínez, Alberto de Jesús (autor) ; Barba Macías, Everardo (autor) ;
Contenido en: Regional Studies in Marine Science Vol. 34, article number 101052 (February 2020), p. 1-12 ISSN: 2352-4855
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Resumen en: Inglés |
Resumen en inglés

Knowledge of the environmental factors that influence the spatial–temporal densities of penaeid shrimp in Mecoacán Lagoon is important for understanding their relationship with the presence (migration) and estuarine habitat preferences. In the present study, the relationships between the physical–chemical components of water and sediments and the population dynamics of penaeid shrimp in Mecoacán Lagoon were evaluated according to a spatial–temporal and multihabitat approach. In six monitoring sites (Boca, Cerros, Mojarrero, Aspoquero Arrastradero and Pajaral), the density and biomass of shrimp were determined from November 2014 to October 2015 based on monthly captures with two nets (seine and renfro) in three habitats: mangrove, soft substrates without vegetation, and submerged aquatic vegetation that corresponds to seagrasses (seagrasses was registered only in Bocaand Cerros). The maximum salinity was found in Boca (23±2.6PSU), with pH values ranging from 7.9±0.1 to 8.3±0.2, and the maximum dissolved oxygen was found in Cerros (6.6±0.5mg/L). The average texture of sediments was 62±3.5% sand, 24±2.4% silt, and 14±1.2% clay.

The highest organic matter (7.8±1.2%) and nitrogen (875mg/kg) contents were recorded in Pajaral. A total of 5,085 penaeid shrimp were captured (seine 77% and renfro 33%), including the species Farfantepenaeus aztecus (Ives) (1,774 ind.), Farfantepenaeus duorarum (Burkenroad) (1,559 ind.), and Litopenaeus setiferus (L.) (1,752 ind.), with a total wet weight of 2,419 g. The spatial segregation patterns of penaeid shrimp suggest that their temporal distribution and habitat preferences are important for reducing interspecific competition. Salinity, dissolved oxygen, organic matter content, and sediment type were the factors that most influenced the spatial–temporal differences in the density and biomass of the penaeid shrimp among sites. Knowledge of the habitat distribution and preferences of key estuarine species such as penaeid shrimp can be used as an informational baseline for evaluating future environmental scenarios and modeling species distribution along the estuarine gradient.


3.
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Vertical variability of benthic foraminifera and trace elements in a tropical coastal lagoon in the Gulf of California
Sánchez, Alberto (autor) ; Gómez León, Adriana (autora) ; Pérez Tribouillier, Habacuc (autor) ; Rey Villiers, Néstor (autor) ; Ortíz Hernández, Ma. Concepción (autora) ; Rodríguez Figueroa, Griselda Margarita (autora) ; Shumilin, Evgueni (autor) ;
Disponible en línea
Contenido en: Marine Pollution Bulletin Volumen 158, artículo número 111417 (September 2020), p. 1-9 ISSN: 0025-326X
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Resumen en: Inglés |
Resumen en inglés

Population growth around water bodies is deteriorating environmental quality. The benthic foraminiferal and trace element concentration in a pair of short sediment cores were used to establish the quality of the sedimentary environment in a tropical coastal lagoon in the southwestern Gulf of California. From 25 cm depth towards the surface of the sediment core, Ammonia beccarii was dominant over nontolerant species and the concentrations of V, Ni, Co, Zn, Cu, Hg and Pb in the sediments increased compared with the lower depth intervals. This finding suggests a deterioration in the environmental quality of the lagoon since 1980, associated with an increase in the sizes of the population and vehicle fleet in the city of La Paz, Baja California Sur, and with the operation of three fossil fuel-based thermoelectric plants since 1985.


4.
Artículo
Anomalía climática medieval y la pequeña edad de hielo en Quintana Roo
Carrillo Bastos, Alicia (autora) ; Islebe, Gerald A. (autor) ; Ulanie Rosas, Chloe Brynie (autora) ; Villegas Sánchez, Carmen Amelia (autora) ;
Disponible en línea
Contenido en: AvaCiet Año 4, volumen 6, número 1 (enero-junio 2019), p. 95-105
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Resumen en: Español | Inglés |
Resumen en español

En el presente estudio se analizan las señales en Quintana Roo, de eventos climáticos globales como la Anomalía Climática Medieval (ACM) y la Pequeña Edad de Hielo (PEH), a través de la comparación de registros sedimentarios de isótopos estables (δ18O/δ16O) y la relación de estos con teleconexiones y forzamientos climáticos por medio de la comparación de distintos sitios. La variabilidad climática fue inferida a partir de la relación de valores de isótopos estables de oxígeno (δ18O/δ16O) medida en la calcita de restos de organismos y a partir del porcentaje de titanio acumulado en sedimentos marinos. La Anomalía Climática Medieval y la Pequeña Edad de Hielo podrían estar vinculados a cambios en la irradiancia solar, las fases de El Niño-Oscilación del Sur y la migración de la Zona Intertropical de Convergencia (ITCZ). La discusión sugiere que las sequías en Quintana Roo ocurren durante fases de baja irradiancia solar, la condición tipo-Niño y la consecuente migración al Sur de la ITCZ. Durante las fases de mayor precipitación cuando la irradiancia solar aumenta, se presenta la condición tipo-Niña (fase negativa del ENSO) y la permanencia en el Norte de la ITCZ. Este mecanismo parece haber regulado el clima durante la ACM, en la cual se presentaron condiciones principalmente húmedas, mientras que en la PEH ocurrieron dos fases sostenidas de sequía.

Resumen en inglés

We analyze the expression of the global climatic events such as the Medieval Climatic Anomaly (ACM) and the Little Ice Age (PEH) in Quintana Roo by comparing stable isotope sedimentary records (δ18O / δ16O) and the relationship of those with teleconnections and climate forcing through the analysis of sediment cores from different sites. Climate variability has been inferred through the relationship of the value of the stable isotope of oxygen (δ18O/δ16O) that was measured from calcium carbonate of skeletal remains and from the percentage of titanium that accumulated in marine deposits offshore Venezuela. The Medieval Climatic Anomaly and the Little Ice Age could be linked to changes in the solar irradiance, the El Niño Southern Oscillation phases and the migration of the Intertropical Convergence Zone. The discussion suggests that dry conditions occur during phases of low solar irradiance, the El Niño-like condition and the consequent southward migration of the ITCZ. And the phases of greater precipitation when the solar irradiance increases, the La Niña-Like condition (negative phase of the ENSO) and the ITCZ is situated north of the Equator. This mechanism seems to have regulated the climate during the ACM, in which humid conditions dominated the Quintana Roo. During the PEH two protracted phases of drought occurred.


5.
- Artículo de divulgación
¿Conviene dragar los cuerpos de agua en las áreas protegidas?
Velázquez Pérez, Carolina ;
Disponible en línea
Contenido en: ECOfronteras Vol. 23, no. 67 (septiembre/diciembre 2019), p. 26-29 ISSN: 2007-4549
Bibliotecas: Tapachula
Cerrar
SIBE Tapachula
29615-90 (Disponible)
Disponibles para prestamo: 1
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Resumen en: Español |
Resumen en español

La deforestación no es solo la ausencia de árboles en un lugar determinado, también se traduce en azolvamiento, es decir, obstrucción de cauces, como ocurre en La Encrucijada, reserva de la biósfera de gran importancia ambiental y reconocimiento internacional. Esta área natural protegida enfrenta la degradación de sus recursos por varias razones, una de las cuales, paradójicamente, debería ser una solución: las obras de dragado.


6.
Artículo
Experimental validation of a cohesive suspended sediment transport model for two Mexican rivers
García Aragón, Juan Antonio (autor) ; Izquierdo Ayala, Klever (autor) ; Castillo Uzcanga, María Mercedes (autora) ; Carrillo Bibriezca, Laura (autora) ; Salinas Tapia, Humberto (autor) ;
Disponible en línea
Contenido en: Environmental Systems Research Volumen 8, número 12 (2019), p. 1-20 ISSN: 2193-2697
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Resumen en: Inglés |
Resumen en inglés

Background: The south of Mexico is the least developed part of the country but its basins generate more than 60% of the country’s available water. Though disturbances to the rivers caused by development are still low, there is concern about the environmental health of the rivers. The calculation of the sediment load with a focus in fine fraction, where nutrients are found, is a priority. However, models for suspended sediment transport in large rivers are difficult to formulate because they carry a large amount of cohesive sediments, those cohesive sediments form aggregates or flocs with primary particles that are less than 65 μm. The hydrodynamic behavior of flocs depends on their size, density and shape, which differs from that of non‑cohesive sediments as theirs depends on their interaction with the water column. A classical model to calculate suspended sediment concentration profiles for steady flow conditions is the Rouse equation, which has been extensively validated for non‑cohesive suspended sediment. Some authors have demonstrated that when applied in some large rivers in conjunction with non‑cohesive settling velocity models it does not perform very well. The difficulty comes from the fact that most of the suspended sediment charge in large rivers is constituted by cohesive sediments.

Results: Suspended sediments from Mexico’s two largest rivers Usumacinta and Grijalva, with a mean flow rate near river mouth of 2020 m³/s and 1150 m³/s respectively, were analyzed in a rotating annular flume (RAF). The shear velocity obtained in the field by ADCP was reproduced in the annular flume, the size and shape of flocs were obtained by means of PTV. Settling velocity was also obtained to calibrate a settling velocity model appropriate for cohesive sediments. Conclusions: The settling velocity model developed for cohesive sediments in conjunction with the Rouse equation allowed the reproduction of suspended sediment concentration profiles for the rivers Usumacinta and Grijalva. The estimated concentration profiles were compared and validated with the measured concentration profiles in the field. Thus, the model obtained through this research can be used to estimate nutrient delivery to the sea from the largest rivers in Mexico.


7.
- Capítulo de libro con arbitraje
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From Calakmul to the sea: the historical ecology of a classic maya city that controlled the Candelaria/Champoton watersheds
Gunn, Joel D. (autor) ; Folan Higgins, William J. (autor) ; Torrescano Valle, Nuria (autor) ; Faust, Betty (autora) ; Geovannini Acuña, Helga Z. (autora) ; Siemens, Alfred H. (autor) ;
Disponible en línea
Contenido en: The holocene and anthropocene environmental history of Mexico: a paleoecological approach on Mesoamerica / editors: Nuria Torrescano Valle, Gerald A. Islebe, Priyadarsi D. Roy Cham, Switzerland: Springer International Publishing, 2019 páginas 209-248 ISBN:978-3-030-31718-8
Bibliotecas: Campeche , Chetumal , San Cristóbal
Cerrar
SIBE Campeche
59785-30 (Disponible)
Disponibles para prestamo: 1
Cerrar
SIBE Chetumal
59785-20 (Disponible)
Disponibles para prestamo: 1
Cerrar
SIBE San Cristóbal
59785-10 (Disponible)
Disponibles para prestamo: 1
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Resumen en: Inglés |
Resumen en inglés

The Candelaria River watershed of Campeche, Mexico, and Petén, Guatemala, has shaped millennia of Maya, perhaps from their beginnings and generations of archaeologists. This chapter reviews efforts to understand Candelaria historical ecology over the past four decades, mostly in the northern branch, the Candelaria-El Caribe-Tomatillal system, as it relates to the cities of Calakmul and Uxul. Additional investigations stem from the river system farther north, the Champoton-Desempeño watershed, which also approaches Calakmul at its headwaters. Four other projects (Oxpemul, Yaxnohcah, Naachtun, Uxul) have emerged in the southern branches of the Candelaria and Desempeño in recent years, in addition to a long-standing project at El Mirador. Methods utilized range over global-local climate teleconnections, geology, ethnoecology, soil formation and transformation, geochemistry, pollen, and phytolith sampling. Brief but key statements of results for each method are reported as they contribute to a holistic perspective on the evolution and the death of Calakmul. Key interests that guided the research are the commercial location of the city and watershed in the Maya urban system, the way the watershed shaped the human settlement pattern in the west central Maya Lowlands, the socio-ecological adaptations over time, and its utility as a middle-level unit of study in links between human and Earth system changes. Finally, a nutrient flow model unifies the results into a concept that may yield deeper insights into the narrative and simulation modelling of Maya social evolution.


8.
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Production and biomass of mangrove roots in relation to hydroperiod and physico-chemical properties of sediment and water in the Mecoacan Lagoon, Gulf of Mexico
Torres Velázquez, Jony Ramiro ; Barba Macías, Everardo (coaut.) ; Choix, Francisco J. (coaut.) ;
Contenido en: Wetlands Ecology and Management Vol. 27, no 2–3 (June 2019), p. 427–442 ISSN: 1572-9834
Bibliotecas: Chetumal
Cerrar
SIBE Chetumal
59486-10 (Disponible)
Disponibles para prestamo: 1
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Resumen en: Inglés |
Resumen en inglés

Production and biomass information of roots is valuable for understanding the ecological process within mangroves. In this study, the production, biomass, turnover rate, and longevity of underground roots of mangrove (Rhizophora mangle L., Laguncularia racemosa L. Gaertn, and Avicennia germinans L. Stearn), as well as the density and biomass of pneumatophores was evaluated in relation to hydroperiod and physico-chemical properties of substrate and water in the Mecoacan Lagoon, Gulf of Mexico. Root extraction was performed in order to measure the biomass and production of roots by in-growth core technique; whilst the hydroperiod and physico-chemical parameters in water were determined using piezometers. The study was conducted from September 2016 to August 2017. A total root biomass of 23.7 tonDw ha−¹ (subterranean roots + pneumatophores) was weighing; the large roots showed the highest biomass weighing 1532 ± 254 gDw m−²; followed by the medium roots (189 ± 30 gDw m−²) and fine roots (194 ± 27 g Dw m−²). The average total production was 0.41 ± 0.05 g m−² day−¹, an average turnover rate of 0.41 ± 0.07 year−¹ and longevity of 4.04 ± 0.07 years. Pneumatophores showed average heights of 17.8 ± 0.8 cm with a density of 292 ± 30 pneumatophores m−² and average biomass of 453 ± 51 gDw m−². In conclusion, the production and biomass of subterranean roots and pneumatophores show spatial variations controlled by environmental factors as hydroperiod, interstitial redox potential, mangrove tree density and soil moisture content.


9.
- Artículo con arbitraje
Mangrove productivity and phenology in relation to hydroperiod and physical–chemistry properties of water and sediment in Biosphere Reserve, Centla Wetland, Mexico
Torres Velázquez, Jony Ramiro ; Barba Macías, Everardo (coaut.) ; Choix, Francisco J. (coaut.) ;
Contenido en: Tropical Conservation Science Vol. 11 (October 2018) p. 1-14 ISSN: 1940-0829
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Resumen en: Inglés |
Resumen en inglés

Mangrove is the dominant vegetation in the estuaries, river deltas, and coastal lagoons of tropical and subtropical regions. A number of factors affect the structure and productivity of mangrove forests, including hydrology, soil salinity, and soil type. In this study, litter production in the Centla Wetland Biosphere Reserve in Tabasco, Mexico, was evaluated as a function of the physical–chemical properties of water and sediments. The study cycle was from June 2015 to June 2016. Litterfall was measured, and water samples were collected at the surface, interstitial, and subterranean level to estimate the physical– chemical parameters. Sediment samples were also collected to determine the texture, pH, organic matter, bulk density, and moisture content. The mangrove was composed of Rhizophora mangle (L.), Laguncularia racemosa (L.) Gaertn, and Avicennia germinans (L.) Stearn. The pH was presented in a range of 5.3 to 7.4, and spatially, the texture of sediment varied significantly, with high values of sand in Playa (73.7% 3.4%) and high content of clay (57.2% 1.4%) and organic matter (41% 2% average) in mangrove riverine type. The highest salinity of interstitial water was encountered at Beach (29 3.0 PSU) and of groundwater (36.4 1.5 PSU). Overall, the average estimated litter fall was 10.45 tonha 1 year 1 . These results indicate that the litter production is related to the response of the mangrove to the variation of the environmental conditions of each site (substrate texture, hydroperiod, soil moisture, water salinity, water redox potential, and soil organic matter).


10.
- Artículo con arbitraje
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Resumen en: Español | Inglés |
Resumen en español

Se provee una primera evidencia sobre un sitio de desove del cangrejo herradura americano Limulus polyphemus en Río Lagartos perteneciente a la Reserva de la Biósfera Ría Lagartos (RBRL) en Yucatán, México. En un solo día, junio de 2016, se realizó un muestreo aleatorio simple sin reemplazo, trazando seis transectos de 10 m de largo cada uno (BOC 1 - BOC 6), medidos a lo largo de la zona intermareal, con tres cuadrantes de 1m² (a, b, c), alternados en cada transecto. Se contabilizaron los nidos encontrados, la profundidad y el número de huevecillos hallados. Se midieron la temperatura, oxígeno disuelto, pH, conductividad eléctrica y salinidad del agua en cada cuadrante, por triplicado, y el sedimento marino se analizó mediante la técnica del tamizado mecánico de Folk. Se encontraron dos nidos sumergidos con profundidades en el sedimento de 20.1 y 16.8 cm, conteniendo un racimo cada uno, con 313 huevecillos y 194 huevos, respectivamente. El ANDEVA no mostró diferencias significativas entre los parámetros fisicoquímicos del agua (p>0.05). Los resultados de los valores sedimentológicos evidenciaron un sedimento compuesto de arena media y pobremente clasificado, presentando una curva muy platicúrtica. Es posible que el número reducido de nidos y huevos en el presente estudio con respecto a los registrados en la costa atlántica de los EUA, se deba a factores relacionados con la estacionalidad, la morfología de la playa y las actividades antrópicas registradas en la zona. Se recomienda incrementar los estudios sobre reproducción y desove de L. polyphemus en la RBRL para sustentar acciones de conservación de la especie y su hábitat en México.

Resumen en inglés

This study provides first evidence about a spawning site of American horseshoe crab Limulus polyphemus at Rio Lagartos, belonging to Biosphere Reserve, in Yucatan, Mexico. In a single day, June 2016, a simple random sampling without replacement was performed. Six transect (BOC 1 - BOC 6) of 10 m of length each one, were measured along the intertidal zone, with 3 quadrants of 1m²(a, b, c) alternated in each transect. The nests, its depth, and the number of eggs found there were quantified. The temperature, dissolved oxygen, pH, electrical conductivity and salinity of the water in every quadrant, for triplicate, were measured. The marine sediment was analyzed by means of grain size analysis of Folk. Two nests, with depths in the sediment of 20.1 and 16.8 cm, containing one cluster each one, with 313 and 194 eggs, respectively, were found. The ANOVA did not show significant differences between the physicochemical parameters of the water measured (p>0.05). The results of the sedimentological values demonstrated sediment consisted of sand and poorly classified, presenting a curve very platicurtic. It is possible that the limited number of nests and eggs in our study with regard to the registered on the Atlantic coast of the USA, should be because several factors i.e. the seasonal variation, the morphology of the beach and anthropic activities. It is recommended to increase the studies on reproduction and spawning of L. polyphemus in the RBRL to encourage actions of preservation of the species in critical habitats of Mexico.