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6 resultados encontrados para: AUTOR: Winemiller, Kirk O
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1.
- 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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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.


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
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Resumen en: Inglés |
Resumen en inglés

Variable hydrology of rivers strongly affects biophysical factors that influence primary production and population densities, thereby affecting the relative influence of bottom-up and top-down processes in trophic networks. Many tropical floodplain rivers have sustained seasonal flood pulses driven by precipitation patterns of the Intertropical Convergence Zone. These changes in flow alter concentrations of dissolved nutrients, aquatic primary productivity, and per-unit-area densities of aquatic organisms. Therefore, one would predict that the strength of top-down effects of animals on basal resources should shift as the annual flood pulse progresses. We conducted a series of field experiments in a Neotropical lowland river to test for effects of hydrologic phase, habitat (in-channel vs. floodplain aquatic habitat), and benthic feeding fish and meiofauna on particulate organic matter, chlorophyll, and benthic microalgae. Net ecosystem productivity of this oligotrophic river is higher during the low phase of the annual flood cycle, which is also when resident fishes are at highest densities and there is a seasonal influx of migratory benthic feeding fish. We therefore hypothesized that top-down effects of benthic-feeding fish would fluctuate temporally, with strongest effects during low water levels. We found that fish controlled the abundance of particulate organic matter and algae on solid substrates, but not on sand, during falling- and low-water phases within both channel and floodplain habitats.

Except for diatom assemblages, which responded to fish exclusion, the taxonomic structure of algal and meiofauna assemblages was not significantly influenced by fish exclusion treatments, but varied in relation to habitat type and hydrologic phase. Meiofauna densities were highest during the low-water period; experimental exclusion of meiofauna during this period had a significant effect on accumulation of particulate organic matter in sand. By controlling abundance of important basal resources, fishes and meiofauna have large potential to influence other components of this tropical ecosystem. Our findings emphasize the predictable, gradual, changes in consumer-resource interactions associated with the seasonal flood pulse in tropical river systems.


4.
- 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.


5.
Artículo
*En hemeroteca, SIBE-San Cristóbal
Hydrogen sulfide, bacteria, and fish: a unique, subterranean food chain
Roach, Katherine A. ; Tobler, Michael (coaut.) ; Winemiller, Kirk O. (coaut.) ;
Contenido en: Ecology Vol. 93, no. 11 (November 2011), p. 2056-2062 ISSN: 0012-9658
Bibliotecas: San Cristóbal
Cerrar
SIBE San Cristóbal
51055-10 (Disponible)
Disponibles para prestamo: 1
Nota: En hemeroteca, SIBE-San Cristóbal
Resumen en: Inglés |
Resumen en inglés

Photoautotrophs are generally considered to be the base of food webs, and habitats that lack light, such as caves, frequently rely on surface-derived carbon. Here we show, based on analysis of gut contents and stable isotope ratios of tissues (13C/12C and 15N/14N), that sulfur-oxidizing bacteria are directly consumed and assimilated by the fish Poecilia mexicana in a sulfide-rich cave stream in Tabasco state, Mexico. Our results provide evidence of a vertebrate deriving most of its organic carbon and nitrogen from in situ chemoautotrophic production, and reveals the importance of alternative energy production sources supporting animals in extreme environments.


6.
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
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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