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103 resultados encontrados para: AUTOR: Rodiles Hernández, María del Rocío
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1.
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.


2.
- Artículo con arbitraje
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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.


3.
- Artículo con arbitraje
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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.


4.
- Artículo con arbitraje
Trophic ecomorphology of cichlid fishes of Selva Lacandona, Usumacinta, Mexico
Soria Barreto, Miriam ; Rodiles Hernández, María del Rocío (coaut.) (1956-) ; Winemiller, Kirk O. (coaut.) ;
Contenido en: Environmental Biology of Fishes Vol. 102, no. 7 (July 2019), p. 985-996 ISSN: 2007-901X
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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.


5.
- Artículo con arbitraje
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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.


6.
- Artículo científico
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Checklist of the marine and estuarine fishes of Chiapas, Mexico
González Acosta, Adrián Felipe ; Rodiles Hernández, María del Rocío (1956-) ; González Díaz, Alfonso Ángel (coaut.) ;
Contenido en: Marine Biodiversity Vol. 48, no. 3 (September 2018), p. 1439–1454 ISSN: 1867-1624
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Resumen en: Inglés |
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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.


7.
- 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
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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.


8.
- 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
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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.


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Quantifying patterns of deforestation and linking these patterns to potentially influencing variables is a key component of modelling and projecting land use change. Statistical methods based on null hypothesis testing are only partially successful for interpreting deforestation in the context of the processes that have led to their formation. Simplifications of cause-consequence relationships that are difficult to support empirically may influence environment and development policies because they suggest simple solutions to complex problems. Deforestation is a complex process driven by multiple proximate and underlying factors and a range of scales. In this study we use a multivariate statistical analysis to provide contextual explanation for deforestation in the Usumacinta River Basin based on partial pattern matching. Our approach avoided testing trivial null hypotheses of lack of association and investigated the strength and form of the response to drivers. As not all factors involved in deforestation are easily mapped as GIS layers, analytical challenges arise due to lack of a one to one correspondence between mappable attributes and drivers. We avoided testing simple statistical hypotheses such as the detectability of a significant linear relationship between deforestation and proximity to roads or water.

We developed a series of informative generalised additive models based on combinations of layers that corresponded to hypotheses regarding processes. The importance of the variables representing accessibility was emphasised by the analysis. We provide evidence that land tenure is a critical factor in shaping the decision to deforest and that direct beam insolation has an effect associated with fire frequency and intensity. The effect of winter insolation was found to have many applied implications for land management. The methodology was useful for interpreting the relative importance of sets of variables representing drivers of deforestation. It was an informative approach, thus allowing the construction of a comprehensive understanding of its causes.


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

La cuenca del Usumacinta es uno de los principales sistemas hidrológicos de México, posee una alta diversidad de flora y fauna, y constituye el último río vivo en el país, por consiguiente la generación de información que ayude a su aprovechamiento sustentable es urgente. El objetivo de esta investigación es analizar la diversidad de especies asociada a la pesca en la cuenca del Usumacinta, haciendo énfasis en la importancia de las especies introducidas en relación a la diversidad de especies explotadas. La cuenca fue dividida en 3 regiones (selva, lagunas y costa). En toda la cuenca, la pesca de pequeña escala explota 35 especies (30 especies de peces y 5 de crustáceos). La mojarra pinta (Parachromis managuensis), la tilapia (Oreochromis niloticus), el bobo escama (Ctenopharyngodon idella), la carpa común (Cyprinus carpio), la carpa roja (Carassius auratus) y los plecos (Pterygoplichthys spp.) son especies introducidas, representando 20.7% del total. En la zona selva, las especies introducidas alcanzaron altas tasas de captura, siendo las carpas las más capturadas. A pesar de que estas especies son parte fundamental de las pesquerías del Usumacinta, sus efectos sobre el ecosistema deben ser analizados, especialmente especies con altas abundancias y nula importancia comercial como los plecos.

Resumen en inglés

The Usumacinta basin is one of the main hydrological systems in Mexico, it has a high diversity of flora and fauna, and it is the last free flowing river in the country, so that the generation of information that helps its sustainable use is urgent. The aim of this research is to analyze the species diversity associated with fishing in the basin of the Usumacinta, considering the importance of invasive species in relation to the diversity of exploited species. The basin was divided into 3 regions (forest, lagoons and coast). Throughout the basin, small-scale fisheries exploited 35 species (30 species of fish and 5 of crustaceans). The jaguar guapote (Parachromis managuensis), tilapia (Oreochromis niloticus), grass carp (Ctenopharyngodon idella), common carp (Cyprinus carpio), red carp (Carassius auratus) and the suckermouth armoured catfish (Pterygoplichthys spp.) are introduced species, representing 20.7% of the total. In the upper area, introduced species reached high catch rates, having the carps the highest capture rate. Although these species are a fundamental part of fisheries in the Usumacinta, its effects on the ecosystem should be analyzed, especially species with high abundances and no importance as the suckermouth armored catfish.