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105 resultados encontrados para: AUTOR: Rodiles Hernández, María del Rocío
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1.
Artículo
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Applicability of biodiversity databases to regional conservation planning in the tropics: a case study evaluation of the effect of environmental bias on the performance of predictive models of species richness
Vaca Genuit, Raúl Abel (autor) ; Rodiles Hernández, María del Rocío (autora) (1956-) ; Soria Barreto, Miriam (autora) ; Muñoz Alonso, Luis Antonio (autor) ; González Díaz, Alfonso Ángel (autor) ; Castillo Santiago, Miguel Ángel (autor) ;
Disponible en línea
Contenido en: Acta Oecologica Volumen 109, artículo número 103653 (November 2020), páginas 1-13 ISSN: 1146-609X
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Resumen en: Inglés |
Resumen en inglés

The biodiversity data typically available for fitting distributional models in the tropics come from museum and scientific collections which are often incomplete and prone to sampling and environmental biases. Nevertheless, most studies undertaken in tropical regions assume that collection data offers a satisfactory environmental coverage without any quantitative assessment. In this study, we investigate the effects of differences in environmental bias and coverage provided by distributional data when aggregated into different grid cell sizes, on the performance of species richness-environment models and predictions. We use an extensive data compilation, including national and regional collections, on the distribution of amphibians, reptiles and fishes in the hydrologic region of the Usumacinta River as a case study. General additive models and environmental variables are used to construct predictive models at 40, 20, 10 and 5 km grid resolutions, based on well-sampled cells. The best multivariate models included nonparametric interaction terms for the effects of precipitation and temperature and suggested an altitudinal shift in the relative importance of energy and water in determining the distribution of species richness.

For fishes, geomorphology accounted for fine scale variation in species richness along the hydrologic network, indicated by peaks in species diversity at the junction of the major rivers where major accumulation of water and sediments occurs. For all taxonomic groups, we found that sampling biases deviated most from the mean bias at the extremes of gradients accounting for important environmental factors. The pattern of environmental bias changed with grid size, with the form and amount of change being casespecific. Biases affected distribution predictions when compared with unbiased datasets. Moreover, not all models resulted best at coarser resolution as it is commonly assumed. Our results demonstrate that bias in the available data must be evaluated before mapping biodiversity distributions, irrespective of the choice of scale.


2.
Artículo
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A geographical cline in craniofacial morphology across populations of Mesoamerican lake-dwelling fishes
Powers, Amanda K. (autora) ; Garita Alvarado, Carlos A. (autor) ; Rodiles Hernández, María del Rocío (autora) (1956-) ; Berning, Daniel J. (autor) ; Gross, Joshua B. (autor) ; Ornelas García, Claudia Patricia (autora) ;
Disponible en línea
Contenido en: Journal of Experimental Zoology. Part A: Ecological and Integrative Physiology Vol. 333, no 3 (March 2020), p. 171-180 ISSN: 2471-5646
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Resumen en: Inglés |
Resumen en inglés

Together, the complex geological history and climatic diversity of Mesoamerica create a rich source of biodiversity from which evolutionary processes can be studied. Here, we discuss highly divergent morphs of lake‐dwelling fishes distributed across Mexico and Central America, originally recognized as members of different genera (Astyanax and “Bramocharax”). Recent phylogenetic studies, however, suggest these morphs group within the same genus and readily hybridize. Despite genetic similarities, Bramocharax morphs exhibit stark differences in cranial shape and dentition. We investigated the evolution of several cranial traits that vary across morphs collected from four lakes in Mexico and Nicaragua and discovered an ecomorphological cline from northern to southern lakes. Northern populations of sympatric morphs exhibit a similar cranial shape and tooth morphology. Southern populations of Bramocharax morphs, however, showed a larger disparity in maxillary teeth, length and frequency of unicuspid teeth, an elongated snout, and a streamlined cranium compared to Astyanax morphs. This divergence of craniofacial morphology likely evolved in association with differences in trophic niches. We discuss the morphological differences across the four lake systems in terms of geological history and trophic dynamics. In summary, our study suggests that Bramocharax morphs are likely locally adapted members derived from independent Astyanax lineages, highlighting an interesting parallel evolutionary pattern within the Astyanax genus.


3.
Tesis - Maestría
Variación e integración morfológica de las mojarras de agua dulce del género Thorichthys Meek 1904 (Cichliformes: Cichlidae) / Limber Sigarroa Gómez
Sigarroa Gómez, Limber (autor) ; González Díaz, Alfonso Ángel ; Soria Barreto, Miriam (asesora) ; Rodiles Hernández, María del Rocío (asesora) (1956-) ;
San Cristóbal de Las Casas, Chiapas, México : El Colegio de la Frontera Sur , 2020
Clasificación: TE/597.58 / S5
Bibliotecas: San Cristóbal
Cerrar
SIBE San Cristóbal
ECO010019911 (Disponible)
Disponibles para prestamo: 1
Resumen en español

El estudio de la diversidad biológica involucra el análisis de los cambios morfológicos. Los cambios en la variación morfológica no siempre tienen el mismo origen y función; existen estructuras que presentan relaciones estrechas y cambian de manera integrada, mientras que otras llegan a ser independientes entre sí, modificándose a través de módulos. Con la finalidad de conocer si la variación morfológica del género Thorichthys es resultado de patrones de integridad morfológica, se evaluó la organización modular utilizando seis modelos modulares, mediante el análisis de morfometría geométrica en 246 especímenes pertenecientes a las nueve especies del género. Se emplearon 20 hitos o marcas y cinco semimarcas alineadas a través del método de superimposición Procrustes. Así mismo, para descartar el efecto alométrico causado por las diferencias en el tamaño, se obtuvieron los residuales de la regresión entre el tamaño del centroide y las variables de deformación. Los valores residuales se usaron en los análisis de componentes principales y en el análisis de integración. Se encontró que la variación interespecífica en la forma del cuerpo se acentúa en el perfil de la cabeza, parte media del cuerpo y el pedúnculo caudal. El análisis de integración morfológica reveló que el cuerpo está organizado en módulos. Los modelos más robustos están integrados por dos módulos: uno anterior representado por la cabeza y otro posterior que incluye la parte media del cuerpo y el pedúnculo caudal; el segundo modelo consta de cabeza y parte media del cuerpo como el primer módulo y el pedúnculo caudal como el segundo. Los cambios en el patrón de modularidad corresponden con los eventos de diversificación dentro del grupo. La organización modular de este grupo de peces está relacionada con la filogenia del grupo.

Índice

Resumen
Palabras clave
Capítulo 1. Introducción
Capítulo 2. Artículo. “Variation and morphological integration in species of Thorichthys (Cichliformes: Cichlidae)”
Capítulo 3. Conclusiones
Literatura Citada


4.
- Artículo con arbitraje
PDF
Resumen en: Inglés |
Resumen en inglés

There is increasing recognition that ecosystems and their services need to be managed at landscape scale and greater. The development of landscape-scale conservation strategies need to incorporate information from multiple sources. In this study, we combine various research tools to link landscape patterns with production units and systems in the Usumacinta River Basin, and inform the discussion of key questions around decisionmaking related to conservation action and policy in Southern Mexico. A typology based on policy-relevant farmer characteristics (land tenure, farm size, source of income, farming system) differentiated between farmers (traditional vs. cattle ranching) with different motivations that determine how management affects landscape configuration. Five main types of traditional farming systems were identified that combine different forms of land use and vary in their degree of land intensification. Major fragmentation and decrease in connectivity coincided spatially with floodplains dominated by large-scale commercial farms that specialize in livestock production.

Traditional practices within large units with low-sloped high quality land were also seen to be intensive; however the presence of trees was notable throughout these units. Policies that promote livestock farming are among the principle causes motivating deforestation. Land intensification by traditional farmers decreased as the landscape became increasingly rugged. Traditional farmers are the focus of initiatives developed by the Biological Corridor project which seeks to increase forest cover and landscape connectivity. These initiatives have shown high levels of rural participation (10,010 farmers benefited from 27,778 projects involving 95,374 ha of land) and acceptance (producers carried out more than one project and several types of projects during the first eight years of work). Strong action is still required to take on the segment of large-scale ranchers. Changes in the structure of land tenure over the past decade are highlighted that could have a profound impact on conservation policies and programs.


5.
- Artículo con arbitraje
PDF PDF
Resumen en: Inglés |
Resumen en inglés

The Lacantun Catfish, Lacantunia enigmatica, is reported for the first time in the Usumacinta river basin in Guatemala. Two specimens were collected in the Usumacinta tributaries Río La Pasión and Río Negro, which are characterized by seasonally fast-flowing deep channels and high fluctuations in water-level. We present a map with new records, and a brief description, and images of the specimens collected.


6.
- Artículo con arbitraje
Trophic ecomorphology of cichlid fishes of Selva Lacandona, Usumacinta, Mexico
Soria Barreto, Miriam (autora) ; Rodiles Hernández, María del Rocío (autora) (1956-) ; Winemiller, Kirk O. (autor) ;
Contenido en: Environmental Biology of Fishes Vol. 102, no. 7 (July 2019), p. 985-996 ISSN: 2007-901X
Resumen en: Inglés |
Resumen en inglés

Neotropical cichlids exhibit great diversity of morphological traits associated with feeding, locomotion, and habitat use. We examined the relationship between functional traits and diet by analyzing a dataset for 14 cichlid species from rivers in the Selva Lacandona region, Usumacinta Basin, Chiapas, Mexico. Volumetric proportions of ingested food items were used to calculate diet breath and interspecific dietary overlap. Morphometric analysis was performed using 24 traits associated with feeding. Associations between morphological and dietary components were assessed using canonical correspondence analysis. The most common feeding guilds were omnivore, herbivore and carnivore (the latter consuming invertebrates and/or fish), with detritivores represented by relatively few species and strict piscivore by one species. Dietary overlap was highest among carnivores (P. friedrichsthalii and T. salvini), herbivores (C. intermedium and C. pearsei) and detritivore-herbivores (V. melanura and K. ufermanni). Dietary components were strongly correlated with several morphological traits, confirming patterns observed in other cichlids. For example, jaw protrusion and mandible length were positively correlated with consumption of fish and terrestrial invertebrates. A longer gut and a wider tooth plate on the lower pharyngeal jaw were correlated with ingestion of vegetation, algae and detritus. Findings confirmed a high degree of trophic specialization in certain species as well as interspecific divergence of functional traits associated with feeding among cichlids of the Usumacinta Basin, which is consistent with the idea that Middle American cichlids represent an adaptive radiation.


7.
- Artículo con arbitraje
Resumen en: Inglés |
Resumen en inglés

Assessments of trophic diversity are critical for evaluating ecological integrity of habitats, but interpretations of such assessments require an understanding of variation across natural environmental gradients. This can be problematic when comparing structure of assemblages in under-studied regions or habitats, such as watersheds in dry tropical forests. Here,we compared assemblage-wide trophic metrics and intraspecific variation for a subset of consumer traits across rivers and among different ecosystem types within the Grijalva and Usumacinta River basins of Mexico. The two rivers differ with respect to flow-regime alteration and climate: the Grijalva River has been hydrologically altered by a series of dams and has wet and dry tropical forests in its watershed, whereas the Usumacinta River remains unimpounded with a watershed dominated by tropical wet forest. Use of allochthonous resourceswas pervasive in Usumacinta basin tributaries,with stable isotope signatures suggesting that many fishes directly consumed riparian plants and detritus. In contrast, fish assemblages inGrijalva basin tributaries were supported by higher proportions of in-stream production. Food-chain length was highest in a Grijalva River reservoir fish assemblage, although trophic diversity was lowin the impounded systemcompared to the mainstem Usumacinta River, where fishes consumed the broadest variety of food resources. We also observed differences in trophic ecology and body nutrient content within taxa across habitat types and basins. The differences we observed suggest that even in relatively intact watersheds, expectations for trophic structure in tropical streams should be adjusted based on factors such as discharge, climate, and riparian forest cover.


8.
- Artículo con arbitraje
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Checklist of the marine and estuarine fishes of Chiapas, Mexico
González Acosta, Adrián Felipe (autor) ; Rodiles Hernández, María del Rocío (autora) (1956-) ; González Díaz, Alfonso Ángel (autor) ;
Disponible en línea
Contenido en: Marine Biodiversity Vol. 48, no. 3 (September 2018), p. 1439–1454 ISSN: 1867-1624
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Resumen en: Inglés |
Resumen en inglés

A systematic checklist is presented for the marine estuarine fishes of Chiapas, Mexico, including notes on their zoogeography and conservation status. The checklist includes 379 species, two classes, 30 orders, 91 families, and 207 genera. Actinopterygii is the most diverse class (323 species, 181 genera, 72 families, and 23 orders), while Chondrichthyes (56 species, 26 genera, 19 families, and seven orders) is the least diverse class. Perciformes is the richest order (175 species, 98 genera, and 32 families), including seven families representing 32.2% of the total fish diversity reported here: Sciaenidae (25 species), Carangidae (21), Gobiidae (20), Haemulidae (14), Epinephelidae (11), Dactyloscopidae (10), and Gerreidae (10). Based on a taxonomical review of specimens in fish collections and literature-verified records, the list is composed of marine-stenohaline (46.7%), marine-euryhaline (48.8%), primary freshwater (1%), secondary freshwater (2.6%), and diadromous (0.2%) species. The ichthyofauna showed greater zoogeographic affinity to the Mexican (81.5%) and Panamic (80.5%) provinces, while 48 species are circumtropical, four amphipacific, five amphiamerican, and one exotic (Oreochromis niloticus). Based on the IUCN Red List, 259 species are of "Least Concern", 18 are "Near Threatened", 11 are "Vulnerable", two are "Critically Endangered" (Pristis pectinata and P. pristis), and one is "Endangered" (Rhincodon typus); 23.2% are "Not Evaluated" or "Data Deficient".

Three species are under "Special Protection" and another three are "Threatened" under Mexican law NOM-059-SEMARNAT-2010. Nearly 75% of the teleostean and 25% of the cartilaginous fishes are of commercial value. Taxonomic identifications should be updated and the geographic distributions of Chiapas’ coastal fish species should be documented in order to design and implement effective management and conservation programs.


9.
- Artículo con arbitraje
Diversidad de la herpetofauna en la cuenca del Usumacinta, México
Muñoz Alonso, Luis Antonio ; Rodiles Hernández, María del Rocío (coaut.) (1956-) ; López León, Nora Patricia (coaut.) ; González Navarro, Alondra (coaut.) ; Chau Cortés, Alba Marina (coaut.) ; Nieblas Camacho, Jorge Alberto (coaut.) ;
Contenido en: Revista Mexicana de Biodiversidad Supl., Vol. 89 (diciembre 2018), p. S79-S99 ISSN: 0187-6376
PDF PDF
Resumen en: Español | Inglés |
Resumen en español

Se presenta un estudio sobre la diversidad y riqueza de la herpetofauna de la cuenca del río Usumacinta, realizado a partir del análisis de 8,808 registros provenientes de colecciones científicas, de la base de datos faunística de la Comisión Nacional para el Conocimiento y Uso de la Biodiversidad, la revisión de referencias bibliográficas y de trabajo de campo, entre agosto del 2014 y octubre del 2015 para 3 zonas (selva, lagunas y costa) en la cuenca del río Usumacinta. Se reportan 42 especies de anfibios y 110 de reptiles. La zona selva es la más rica en especies, con 136, siguiéndole la zona lagunas con 108 herpetozoos y la zona costa con una riqueza de 66 especies. Los valores del número efectivo de especies reportados (qD) indican diferencias entre las zonas estudiadas; el más alto para lagunas (1D = 20.98 ± 3.35), el segundo para costa (1D = 16.01 ± 2.35) y el último para zona selva (1D = 11.63 ± 1.64). Se analiza la diversidad y composición de 3 gremios funcionales: anuros, tortugas y cocodrilos. Desde el punto de vista herpetofaunístico, las zonas selva y lagunas son las más importantes por su alta riqueza y diversidad de especies.

Resumen en inglés

A study is presented on the diversity and richness of the herpetofauna of the Usumacinta basin, based on 8,808 records from scientific collections, faunistic databases of the Comisión Nacional para el Conocimiento y Uso de la Biodiversidad, bibliographical references review, and field survey (2014-2015) for 3 study zones (Selva, Lagunas, and Costa) in the basin. For the study region, 42 species of amphibians and 110 species of reptiles were reported. The Selva zone was the richest in species, with 136, followed by Lagunas with 108 herpetozoos and Costa with a richness of 66 species. Values of effective number of species (qD) indicate differences between the study zones, showing Lagunas (1D = 20.98 ± 3.35) the highest value, followed by Costa (1D = 16.01 ± 2.35) and Selva (1D = 11.63 ± 1.64). The diversity and composition of three functional guilds (anurans, turtles and crocodiles) were analyzed. Selva and Lagunas are the most important zones based on their high richness and diversity of amphibians and reptiles.


10.
- Artículo con arbitraje
Diversidad íctica en la cuenca del Usumacinta, México
Soria Barreto, Miriam ; González Díaz, Alfonso Ángel (coaut.) ; Castillo Domínguez, Alfredo (coaut.) ; Álvarez Pliego, Nicolás (coaut.) ; Rodiles Hernández, María del Rocío (coaut.) (1956-) ;
Contenido en: Revista Mexicana de Biodiversidad Supl., Vol. 89 (diciembre 2018), p. S100-S117 ISSN: 0187-6376
PDF PDF
Resumen en: Español | Inglés |
Resumen en español

La cuenca del río Usumacinta se caracteriza por su gran extensión, heterogeneidad ecológica y alta biodiversidad. Con el objetivo de documentar de manera integral la riqueza y distribución de la ictiofauna, se incluyen en este trabajo los registros para la cuenca (1994-2014) depositados en la Colección de Peces (ECOSC), además de la revisión bibliográfica y de los registros de otras bases de datos nacionales e internacionales. Adicionalmente y con la finalidad de analizar la diversidad y abundancia, se realizaron muestreos (2014 y 2015) en 3 zonas: selva, planicie y delta. La ictiofauna se compone de 2 clases, 28 órdenes, 50 familias y 172 especies, de las cuales 3 son nuevos registros. De acuerdo a su afinidad ecológica, 75 especies son dulceacuícolas, 8 estuarinas y 89 marinas. La zona selva tuvo más especies dulceacuícolas exclusivas y la zona delta registró la mayor riqueza de peces marinos. Los cambios observados en la diversidad a lo largo de las 3 zonas están influidos por la historia geológica, dinámica hidrológica y su conectividad con el golfo de México. Es necesario continuar con el estudio de la ictiofauna en función de la complejidad geomorfológica para entender patrones biogeográficos, así como procesos ecológicos importantes para su conservación.

Resumen en inglés

The Usumacinta Basin is characterized by its large size, ecological heterogeneity and high diversity of fish. The purpose of this work was to examine the richness and distribution of the fish fauna, and analyze the diversity and abundance in three zones of the basin. The records (1994-2014) in the Fish Collection (ECOSC) are included, additional information was obtained from a review of the scientific literature, records of national and international fish databases, and from samplings conducted (2014-2015) in 3 zones: rainforest, floodplain and delta. The fish fauna is composed of 2 classes, 28 orders, 50 families and 172 species; 3 of these are new records for the region. According to the ecological affinity, 75 species are freshwater, 8 estuarine and 89 marine. The rainforest zone had more freshwater exclusive species, and the delta zone had the biggest richness of marine fish. The diversity changes along 3 zones, which is influenced by its hydrological dynamics, geological history and its connectivity with the Gulf of Mexico. It is necessary to continue studying the ichthyofauna as related to the geomorphological complexity to understand biogeographical patterns, as well as ecological processes important for conservation.