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7 resultados encontrados para: TEMA: Ecomorfología
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1.
Artículo
*Solicítelo con su bibliotecario/a
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
Nota: Solicítelo con su bibliotecario/a
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
*Solicítelo con su bibliotecario/a
Feeding ecology and ecomorphology of cichlid assemblages in a large Mesoamerican river delta
Pease, Allison A. ; Mendoza Carranza, Manuel (coaut.) ; Winemiller, Kirk O. ;
Contenido en: Environmental Biology of Fishes Vol. 101, no. 6 (June 2018), p. 867–879 ISSN: 0378-1909
Nota: Solicítelo con su bibliotecario/a
Resumen en: Inglés |
Resumen en inglés

Fish assemblages in tropical lowland rivers are characterized by a high richness of species that feed on a diverse array of food resources. Although closely related species often have similar feeding ecology, species within the family Cichlidae display a broad spectrum of trophic niches, and resource partitioning has been inferred from studies conducted in Neotropical rivers. We investigated interspecific variation in food resource use and its relationship to morphological variation among cichlid fishes within the Pantanos de Centla Biosphere Reserve, a coastal area encompassing the delta of the Grijalva-Usumacinta River in Tabasco, Mexico. Most species consumed benthic crustaceans, aquatic insect larvae, and detritus, but some were more herbivorous, and one species was a specialized piscivore. Dietary niche overlap among species was higher than expected for one assemblage, and similar to random expectations for another, suggesting a lesser role for resource partitioning than has been shown for some cichlid assemblages, perhaps due to availability of abundant resources, even in low-water conditions. Canonical correspondence analysis revealed that greatest morphological differences am7ong species involved functional traits directly associated with resource use. Relationships between feeding ecology and morphology were similar to those described for other riverine cichlids. Strong ecomorphological relationships facilitate inferences about the ecology of cichlid species, including species that currently lack data from field studies. Knowledge of ecological relationships will be important for conservation in the Pantanos de Centla, an ecosystem of global significance for biodiversity and ecosystem services.


3.
- Artículo con arbitraje
Functional diversity and trait–environment relationships of stream fish assemblages in a large tropical catchment
Pease, Allison A. ; González Díaz, Alfonso Ángel (coaut.) ; Rodiles Hernández, María del Rocío (coaut.) (1956-) ; Winemiller, Kirk O. (coaut.) ;
Contenido en: Freshwater Biology Vol. 57, no. 5 (May 2012), p. 1060–1075 ISSN: 0046-5070
Resumen en: Inglés |
Resumen en inglés

1. The species composition of stream fish assemblages changes across the longitudinal fluvial gradient of large river basins. These changes may reflect both zonation in species distributions and environmental filtering of fish traits as stream environments change from the uplands to the lowlands of large catchments. Previous research has shown that taxonomic diversity generally increases in larger, lowland streams, and the River Continuum Concept, the River Habitat Template and other frameworks have provided expectations for what functional groups of fishes should predominate in certain stream types. However, studies addressing the functional trait composition of fish assemblages across large regions are lacking, particularly in tropical river basins. 2. We examined functional trait–environment relationships and functional diversity of stream fish assemblages in the Río Grijalva Basin in southern Mexico. Traits linked to feeding, locomotion and life history strategy were measured in fishes from streams throughout the catchment, from highland headwaters to broad, lowland streams. Relationships between functional traits and environmental variables at local and landscape scales were examined using multivariate ordination, and the convex hull volume of trait space occupied by fish assemblages was calculated as a measure of functional diversity. 3. Although there were a few exceptions, functional diversity of assemblages increased with species richness along the gradient from uplands to lowlands within the Grijalva Basin. Traits related to swimming, habitat preference and food resource use were associated with both local (e.g. substratum type, pool availability) and landscape-scale (e.g. forest cover) environmental variables.

4. Along with taxonomic structure and diversity, the functional composition of fish assemblages changed across the longitudinal fluvial gradient of the basin. Trait–environment relationships documented in this study partially confirmed theoretical expectations and revealed patterns that may help in developing a better understanding of general functional responses of fish assemblages to environmental change.


4.
Artículo
*En hemeroteca, SIBE-San Cristóbal
Contrasting change in taxonomic vs. functional diversity of tropical fish communities after habitat degradation
Villeger, Sebastien ; Ramos Miranda, Julia (coaut.) ; Flores Hernández, Domingo (coaut.) ; Mouillot, David (coaut.) ;
Contenido en: Ecological Applications Vol. 20, no. 6 (September 2010), p. 1512-1522 ISSN: 1051-0761
Bibliotecas: San Cristóbal
Cerrar
SIBE San Cristóbal
49836-10 (Disponible)
Disponibles para prestamo: 1
Nota: En hemeroteca, SIBE-San Cristóbal
Resumen en: Inglés |
Resumen en inglés

Human activities have strong impacts on ecosystem functioning through their effect on abiotic factors and on biodiversity. There is also growing evidence that species functional traits link changes in species composition and shifts in ecosystem processes. Hence, it appears to be of utmost importance to quantify modifications in the functional structure of species communities after human disturbance in addition to changes in taxonomic structure. Despite this fact, there is still little consensus on the actual impacts of human-mediated habitat alteration on the components of biodiversity, which include species functional traits. Therefore, we studied changes in taxonomic diversity (richness and evenness), in functional diversity, and in functional specialization of estuarine fish communities facing drastic environmental and habitat alterations. The Terminos Lagoon (Gulf of Mexico) is a tropical estuary of primary concern for its biodiversity, its habitats, and its resource supply, which have been severely impacted by human activities. Fish communities were sampled in four zones of the Terminos Lagoon 18 years apart (1980 and 1998). Two functions performed by fish (food acquisition and locomotion) were studied through the measurement of 16 functional traits. Functional diversity of fish communities was quantified using three independent components: richness, evenness, and divergence. Additionally, we measured the degree of functional specialization in fish communities.

We used a null model to compare the functional and the taxonomic structure of fish communities between 1980 and 1998. Among the four largest zones studied, three did not show strong functional changes. In the northern part of the lagoon, we found an increase in fish richness but a significant decrease of functional divergence and functional specialization. We explain this result by a decline of specialized species (i.e., those with particular combinations of traits), while newly occurring species are redundant with those already present. The species that decreased in abundance have functional traits linked to seagrass habitats that regressed consecutively to increasing eutrophication. The paradox found in our study highlights the need for a multifaceted approach in the assessment of biodiversity changes in communities under pressure.


5.
Tesis - Doctorado
Ecomorfología de los Cíclidos en la Selva Lacandona (Rebima), Chiapas, México / Miriam Soria Barreto
Soria Barreto, Miriam ; Rodiles Hernández, María del Rocío (tutora) (1956-) ; Schmitter Soto, Juan Jacobo (asesor) ; Barba Macías, Everardo (asesor) ; Winemiller, Kirk O. (asesor) ;
San Cristóbal de Las Casas, Chiapas, México : El Colegio de la Frontera Sur , 2009
Clasificación: TE/597.74097275 / S6
Cerrar
SIBE Campeche
ECO040003886 (Disponible)
Disponibles para prestamo: 1
Cerrar
SIBE Chetumal
ECO030007002 (Disponible)
Disponibles para prestamo: 1
Cerrar
SIBE San Cristóbal
ECO010010822 (Disponible)
Disponibles para prestamo: 1
Cerrar
SIBE Tapachula
ECO020012419 (Disponible)
Disponibles para prestamo: 1
Cerrar
SIBE Villahermosa
ECO050003873 (Disponible)
Disponibles para prestamo: 1
PDF
Índice | Resumen en: Español |
Resumen en español

La diversidad morfológica en los cíclidos se ha asociado al uso diferencial de los recursos; es posible, que en la Selva Lacandona también manifiesten segregaciones en el alimento y espacio. En este sentido, el objetivo del trabajo fue conocer la morfología relacionada con la alimentación y uso de hábitat, que aunada a la segregación espacial y trófica permitan explicar la coexistencia y diversidad de estos peces. Se utilizaron 16 especies de cíclidos procedentes del río Tzendales, río Lacanjá y lago Lacanjá, se realizó el análisis morfométrico a partir de 33 medidas tradicionales y 15 marcas en la morfometría geométrica. Se calculó el reparto trófico y espacial. La morfología se correlacionó con la dieta y el hábitat; además, se analizó la variación morfológica en la ontogenia de tres especies. El análisis morfométrico indicó una diferenciación morfológica interespecífica, relacionada con el uso de macrohábitat y tipo de alimento consumido; este patrón morfológico fue semejante entre los sitios analizados. Los cíclidos del río Tzendales manifestaron un uso diferencial del hábitat, fuerte correlación entre la abundancia y el hábitat durante el estiaje y se obtuvo una importante superposición espacial entre cinco pares de especies.

El análisis trófico señaló que son especies herbívoras, carnívoras y omnívoras; la superposición trófica fue mayor entre las carnívoras y las especies del género Vieja. Sin embargo, existe un reparto de recursos alimenticios y espaciales, lo cual constituye un posible mecanismo que explique la coexistencia de las especies. La correlación entre la morfología y el hábitat fue muy débil, se presentó sólo en la época de estiaje. La correlación trófica fue mayor y permitió diferenciar los grupos tróficos, lo cual apoya la idea de la especialización por el tipo de alimento consumido en los cíclidos neotropicales y se considera que es un mecanismo importante en la diversificación del grupo.

Índice

Resumen
Introducción
Antecedentes
Justificación
Hipótesis
Objetivo General
Objetivos Particulares
Área de Estudio
Materiales y Métodos
Resultados
Análisis morfométrico
Uso del hábitat
Morfología y hábitat
Alimentación
Morfología y alimentación
Análisis ontogénico
Discusión
Conclusiones
Recomendaciones
Literatura Citada
Anexo 1
Anexo 2
Anexo 3
Anexo 4


6.
Libro
Functional and evolutionary ecology of bats / edited by Akbar Zubaid, Gary F. McCracken, and Thomas H. Kunz
Zubaid, Akbar (ed.) ; McCracken, Gary F. (coed.) (1948-) ; Kunz, Thomas H. (coed.) ;
Oxford : Oxford University Press , 2006
Clasificación: 599.417 / F8
Bibliotecas: San Cristóbal
Cerrar
SIBE San Cristóbal
ECO010012510 (Disponible)
Disponibles para prestamo: 1

7.
Libro
Ontogeny, functional ecology, and evolution of bats / edited by Rick A. Adams and Scott C. Pedersen
Adams, Rick A. (ed.) ; Pedersen, Scott C. (coed.) (1960-) ;
Cambridge : Cambridge University , c2000
Clasificación: 599.4 / F5
Bibliotecas: Chetumal
Cerrar
SIBE Chetumal
ECO030000166 (Disponible)
Disponibles para prestamo: 1