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2 resultados encontrados para: AUTOR: López Rasgado, Francisco Javier
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1.
Artículo
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Resumen en: Español | Inglés |
Resumen en español

El objetivo de este estudio es mostrar que las pesquerías de elasmobranquios del sur del Golfo de México son parte de sistemas pesqueros complejos y que es posible la aplicación del marco metodológico basado en los sistemas socio-ecológicos (SSE) para su evaluación. La heterogeneidad de las pesquerías artesanales del sur del Golfo de México, en relación con la cambiante importancia estacional de los recursos pesqueros y con la dinámica de la flota, hace necesario el uso de marcos metodológicos integrales, como el basado en SSE, que permitan analizar las interacciones de las dimensiones sociales y ecológicas. Este estudio demuestra que es posible la delimitación regional para identificar SSE considerando límites políticos y biofísicos, así como la dinámica de los recursos y de la flota pesquera. Con base en los resultados se considera que los escenarios para la delimitación de SSE más factibles de evaluar e instrumentar es a escala estatal (escenario 1, con tres SSE: Tabasco, Campeche y Yucatán), o el que considera los principales recursos pesqueros (escenario 4, con siete SSE). En ambos escenarios, los elasmobranquios tienen un papel importante en algunos de los SSE. La generación y la recopilación exhaustiva de la información para caracterizar los SSE, permitirá determinar en estudios futuros cuál es el escenario más apropiado, no sólo en términos de evaluación, sino de la instrumentación del manejo pesquero.

Resumen en inglés

The objective of this study was to show that elasmobranch fisheries from southern Gulf of Mexico are included within complex fishery systems, and that the use of the Social-Ecological Systems (SSE) framework can assess those fishery systems. The heterogeneity of the small-scale fisheries in southern Gulf of Mexico, related to the seasonal importance changes of the fishery resources and the fleet dynamic, generates the necessity for the use of integral frameworks (such as the SSE framework), to analyze interactions between social and ecological dimensions. This study demonstrates that the regional delimitation is possible to identify SSE considering political and biophysical boundaries, as well as the fishing resources and fishing fleet dynamics. Based on the results, we consider that the more feasible delimitation to assess and implement SSE is at the state level (scenario 1, with three SSE: Tabasco, Campeche and Yucatan), or the one that considered the main fishing resources (scenario 4, with seven SSE). In both scenarios, elasmobranchs play an important role in some SSE. The generation and comprehensive compilation of data to characterize SSE will allow determining in future studies which scenario is more appropriate not only in terms of assessment, but also with regard to the implementation of fishery management.


2.
- Artículo con arbitraje
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Variation in isotopic trophic structure and fish diversity in mangrove systems subject to different levels of habitat modification in the Gulf of California, Mexico
López Rasgado, Francisco Javier ; Lluch Cota, Salvador E. (coaut.) ; Balart, Eduardo F. (coaut.) ; Herzka, Sharon Z. (coaut.) ;
Contenido en: Bulletin of Marine Science Vol. 92, no. 4 (October 2016), p. 399-422 ISSN: 0007-4977
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Resumen en: Inglés |
Resumen en inglés

Anthropogenic modification of mangrove systems can lead to decreased habitat quality, potentially affecting food web structure and ecosystem function. Based on carbon and nitrogen stable isotopes, we evaluated the trophic structure of the fish communities from three mangrove systems in southern Baja California, Mexico, subject to varying levels of habitat modification. We hypothesized that anthropogenic habitat modification leads to differences in niche space (and hence trophic structure). We applied a Bayesian approach to the calculation of community level isotope-based metrics of functional trophic structure and compared the results to a structural (Shannon-Wiener) index of diversity. Frequency distributions of stable isotope ratios revealed differences between the highly modified mangrove system and those with limited or no habitat modification. Comparison of the isotopic composition of the dominant fish species sampled in summer and winter indicated limited seasonal differences in this arid region. However, isotope-derived metrics of niche space were evaluated in the most highly modified mangrove system, suggesting a greater complexity in nutrient and primary production sources, a higher level of dietary specialization, and low functional redundancy. Fishes from the most pristine mangrove system exhibited highest diversity, a more limited range of isotopic values, and smaller measures of isotopic niche space, indicative of higher trophic redundancy. Comparison of the standardized (baseline-controlled) species-specific isotope ratios indicated that in 37% of cases isotopic differences persisted, further supporting our interpretation of variations in trophic structure. This research highlights that mangrove habitat modification has a marked influence on functional trophic diversity, as well as the fish community structure.