Búsqueda avanzada


Área de conocimiento




241 resultados, página 8 de 10

Dynamic simulation of diploid vs. triploid Pacific oyster (Crassostrea gigas) productive performance in northwestern Mexico

ROBERTO ASCENCIO MICHEL Ana María Ibarra Humphries MARCELO EDUARDO ARANEDA PADILLA GERMAN PONCE DIAZ FRANCISCO JAVIER VERGARA SOLANA (2022, [Artículo])

"The Pacific oyster Crassostrea gigas was introduced in northwestern Mexico for aquaculture purposes. Although its cultivation has been successful, this species has shown high mortalities during summer. To mitigate this problem, producers have resorted to biotechnology (triploidy), whose performance -regarding diploid seedling- depends on site conditions and stocking time. Hence, uncertainty exists on its benefits under real production conditions. This research evaluates triploidy performance by implementing a Dynamic simulation model considering environmental effects (temperature and chlorophyll) on culture production. The dynamic simulation was based on systems theory, dividing the productive system into two sub-models (environmental and biological), including temperature and chlorophyll effects, growth, mortality, and condition index parameterized in the function of the environmental parameters. The dynamic simulation results suggest that implementing triploid culture is advantageous in zones under high stress associated with high temperatura and low productivity; likewise, triploid spat tends to show better performance independently of the site. Nevertheless, performance by ploidy varies depending on the environmental conditions of the sites."

BIOLOGÍA Y QUÍMICA CIENCIAS DE LA VIDA BIOLOGÍA ANIMAL (ZOOLOGÍA) FISIOLOGÍA ANIMAL FISIOLOGÍA ANIMAL

Draft Genome Sequence of Pediococcus pentosaceus Strain PP16CC, Isolated from Oyster Crassostrea corteziensis

JULIO ANTONIO HERNANDEZ GONZALEZ RICARDO VAZQUEZ JUAREZ Jose Manuel Vazquez-Guillen Carlos Rangel Dávalos MARIA CRISTINA RODRIGUEZ PADILLA MAURILIA ROJAS CONTRERAS (2022, [Artículo])

"Pediococcus pentosaceus strain PP16CC comes from the intestine of Crassostrea corteziensis. A 1.82-Mbp draft genome of this strain was assembled using A5-miseq from illumina reads, resulting in 4 contigs and 1,856 predicted protein coding genes. Additionally, 23 proteins belonging to various glycosyl hydrolase families and 6 prophage regions were identified."

Genome Sequence, Pediococcus pentosaceus BIOLOGÍA Y QUÍMICA CIENCIAS DE LA VIDA BIOLOGÍA ANIMAL (ZOOLOGÍA) GENÉTICA ANIMAL GENÉTICA ANIMAL

Desigualdad social en la distribución, acceso y uso del agua potable en la comunidad de San Juan de Guadalupe

JESUS FRANCISCO GUTIERREZ RADILLO (2020, [Tesis de maestría])

"La presente investigación tiene como objetivo analizar las desigualdades sociales en las zonas periurbanas de la ciudad de San Luis Potosí, con énfasis al desabasto de agua potable y los conflictos por la tierra. Se pone como caso de estudio la comunidad de San Juan de Guadalupe (CSJG) para explicar cómo accede la población a este líquido y, cómo es la

distribución. A fin de entender qué es lo que ha dado origen a desigualdades sociales en el servicio de agua potable, asociadas a la tenencia de la tierra y la consecuente organización vecinal."

Agua -- Condiciones sociales -- San Juan de Guadalupe -- San Luis Potosí, México Agua potable -- Leyes y legislación -- México Agua potable -- Abastecimiento -- San Juan de Guadalupe CIENCIAS FÍSICO MATEMÁTICAS Y CIENCIAS DE LA TIERRA CIENCIAS DE LA TIERRA Y DEL ESPACIO HIDROLOGÍA HIDROLOGÍA

Trophic ecology of Mexican Pacific harbor seal colonies using carbon and nitrogen stable isotopes

MARICELA JUAREZ RODRIGUEZ (2020, [Artículo])

There is limited information that provides a comprehensive understanding of the trophic ecology of Mexican Pacific harbor seal (Phoca vitulina richardii) colonies. While scat analysis has been used to determine the diet of some colonies, the integrative characterization of its feeding habits on broader temporal and spatial scales remains limited. We examined potential feeding grounds, trophic niche width, and overlap, and inferred the degree of dietary specialization using stable carbon and nitrogen isotope ratios (δ13C and δ15N) in this subspecies. We analyzed δ13C and δ15N on fur samples from pups collected at five sites along the western coast of the Baja California Peninsula, Mexico. Fur of natal coat of Pacific harbor seal pups begins to grow during the seventh month in utero until the last stage of gestation. Therefore pup fur is a good proxy for the mother's feeding habits in winter (∼December to March), based on the timing of gestation for the subspecies in this region. Our results indicated that the δ13C and δ15N values differed significantly among sampling sites, with the highest mean δ15N value occurring at the southernmost site, reflecting a well-characterized north to south latitudinal 15N-enrichment in the food web. The tendency identified in δ13C values, in which the northern colonies showed the most enriched values, suggests nearshore and benthic-demersal feeding habits. A low variance in δ13C and δ15N values for each colony (<1‰) and relatively small standard ellipse areas suggest a specialized foraging behavior in adult female Pacific harbor seals in Mexican waters. © 2020 Juárez-Rodríguez et al.

carbon, delta carbon 13, delta nitrogen 15, isotope, nitrogen, unclassified drug, carbon, nitrogen, Article, correlational study, feeding behavior, latitude, Mexico, nonhuman, organism colony, Pinnipedia, population abundance, species richness, troph BIOLOGÍA Y QUÍMICA CIENCIAS DE LA VIDA BIOLOGÍA ANIMAL (ZOOLOGÍA) BIOLOGÍA ANIMAL (ZOOLOGÍA)

Alternativas viables para la provisión de servicios básicos en áreas periurbanas: lecciones desde Xochimilco, Ciudad de México

JOSE LUIS MARTINEZ RUIZ (2016, [Libro])

Tabla de contenido: Introducción -- 1. Agua potable, saneamiento y residuos sólidos en el contexto del crecimiento demográfico de la Ciudad de México -- 2. Xochimilco: la urbanización acelerada de un espacio rural -- 3. La importancia de la participación social -- 4. La participacion social en el proyecto Vivace -- 5. De los escenarios a la realidad: estudio de factibilidad sociotécnica del proyecto Vicace -- 6. conclusiones y recomendaciones.

Dentro del marco de coloboración internacional entre la Unión Europea y el Instituto Mexicano de Tecnología del Agua, se desarrolló el proyecto de investigación denominado Vital and Viable Services for Natural Resources Management in Latin America (Vivace), con el objetivo de integrar varios factores que permitan encontrar soluciones viables a necesidades vitales en las áreas periurbanas. Se presentan los resultados obtenidos en dos estudios comparativos: uno en la zona periurbana de Xochimilco, Ciudad de México y otro en la municipalidad de El Trigre, Buenos Aires, Argentina. En ambos casos se presenta el control centralizado del sector agua, desde, al menos, la década de los años ocheta, en México y en los años noventa, para el caso de Argentina.

Introducción -- 1. Agua potable, saneamiento y residuos sólidos en el contexto del crecimiento demográfico de la Ciudad de México -- 2. Xochimilco: la urbanización acelerada de un espacio rural -- 3. La importancia de la participación social -- 4. La participacion social en el proyecto Vivace -- 5. De los escenarios a la realidad: estudio de factibilidad sociotécnica del proyecto Vicace -- 6. conclusiones y recomendaciones.

Abastecimiento de agua Saneamiento básico Participación comunitaria Zonas periurbanas Xochimilco, Ciudad de México CIENCIAS SOCIALES

Recent advances on research of native prawn Macrobrachium americanum (Decapoda: Palaemonidae) with aquaculture and conservation purposes

Yuneisy Milagro Agüero Fernández MIRIAM VICTORIA MARTIN MANZO MARITZA LOURDES SOBERANES YEPIZ Marcelo Ulises García Guerrero Yuniel Méndez Martínez Luis Hector Hernandez Hernandez Laura S López Greco Edilmar Cortés Jacinto (2022, [Artículo])

"Where good management practices on aquaculture are mandatory. The economic and ecological importance of prawns of the Genus Macrobrachium cause an impact at a global level involving economic, academic and social aspects. Macrobrachium americanum appears as one of the genus species with high nutritional value and an economic demand in the national and international markets, as well as a vital income for fisherman and producers of this species. For researchers, it is a challenge to find solutions to culture and propose conservation measures for M. americanum with emphasis on development, nutrition and reproduction. Although there are scientific studies supporting the economic importance of this species, our knowledge about its cultivation, reproduction and conservation is limited. This paper summarizes the latest studies made in cooperation with M. americanum in research lead by the Centro de Investigaciones Biológicas del Noroeste, Mexico. After several years of continuous research, it is considered that those efforts have produced useful information for the sustainable exploitation, conservation and basic management practices of this species."

Freshwater ecosystem, growth rate, native prawn species, conservation, sustainable fishing BIOLOGÍA Y QUÍMICA CIENCIAS DE LA VIDA BIOLOGÍA ANIMAL (ZOOLOGÍA) ECOLOGÍA ANIMAL ECOLOGÍA ANIMAL