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Search Results: 1 - 10 of 29553 matches for " Rebeca;Godínez-Domínguez "
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Summer composition and distribution of the jellyfish (Cnidaria: Medusozoa) in the shelf area off the central Mexican Pacific
Segura-Puertas, Lourdes;Franco-Gordo, Carmen;Suárez-Morales, Eduardo;Gasca, Rebeca;Godínez-Domínguez, Enrique;
Revista mexicana de biodiversidad , 2010,
Abstract: the composition, distribution, and abundance of the jellyfish community of a shelf area of the mexican tropical pacific were surveyed during august 1988. zooplankton samples were collected along transects on the outer and inner sectors of the continental shelf to determine the structure of the jellyfish community and its variation in this area during the rainy season. a total of 23 species were recorded, with aglaura hemistoma, solmundella bitentaculata, liriope tetraphylla, pelagia noctiluca, and rhopalonema velatum being the most abundant. the total abundance of medusae and of the most abundant species was statistically independent of depth and distance to the coast. hence, the total jellyfish abundance of the most abundant species, and shannon's diversity index had a uniform distribution in both the inner and the outer shelf; furthermore, neritic-oceanic forms and oceanic species occurred indistinctly over the entire continental shelf. on the outer shelf a. hemistoma and s. bitentaculata were most abundant; the former species, together with l. tetraphylla, weakly characterized the inner shelf jellyfish community. the narrowness of the shelf, the wide distribution of the most abundant forms, and the possible effect of local advective processes from the oceanic zone masked a definite gradient across the shelf. three species have not been recorded previously in the mexican pacific: amphinema dinema (péron and lesueur, 1810), sarsia coccometra bigelow, 1909, and clytia mccradyi (brooks, 1888). the finding of a. dinema is the first in the eastern pacific.
Abundance variation of Porichthys margaritatus (Pisces: Batrachoididae) throughout thermic and bathymetric gradients in the central Mexican Pacific
Godínez-Domínguez,Enrique; Aguilar-Palomino,Bernabé; González-Sansón,Gaspar;
Revista de Biología Tropical , 2001,
Abstract: three cruises, one in cach of the main stream patterns in the area, were made on the central mexican pacific continental slope (may-june 1995, november 1995, and march 1996). seven trawl sampling sites were defined per cruise, and in each site four bathymetric levels were sampled (20, 40, 60, and 80 m). during the warmest seasons, the highest abundance of porichthys margaritatus was at 60 m. when the temperature of the bottom water was lower, in march 1996, the highest abundance of p. margaritatus moved towards 40 m. the depths with greatest abundance fluctuated between 18 and 21°c, indicating a narrow temperature preference range. a gaussian model was used to explain the relation between abundance and temperatura.
Abundance variation of Porichthys margaritatus (Pisces: Batrachoididae) throughout thermic and bathymetric gradients in the central Mexican Pacific
Enrique Godínez-Domínguez,Bernabé Aguilar-Palomino,Gaspar González-Sansón
Revista de Biología Tropical , 2001,
Abstract: Three cruises, one in cach of the main stream patterns in the area, were made on the central Mexican Pacific continental slope (May-June 1995, November 1995, and March 1996). Seven trawl sampling sites were defined per cruise, and in each site four bathymetric levels were sampled (20, 40, 60, and 80 m). During the warmest seasons, the highest abundance of Porichthys margaritatus was at 60 m. When the temperature of the bottom water was lower, in March 1996, the highest abundance of P. margaritatus moved towards 40 m. The depths with greatest abundance fluctuated between 18 and 21°C, indicating a narrow temperature preference range. A Gaussian model was used to explain the relation between abundance and temperatura. Se analizaron tres cruceros de pesca demersal, uno por cada pauta principal de circulación marina en la zona (mayo-junio de 1995, noviembre de 1995, y marzo de 1996). Se determinaron siete sitios de muestreo en cada crucero y en cada sitio se muestrearon cuatro estratos batimétricos (20,40, 60 y 80 m). Durante la época cálida, las mayores abundancias de Porychthys nwrgaritatus se encontraron en 60 m. Cuando la temperatura de fondo fue mínima durante marzo de 1996, las mayores abundancias se desplazaron a 40 m de profundidad. La temperatura de máximas abundancias fluctuaron entre 18 y 21 °C, lo cual indica un estrecho rango de preferencia térmica. Se propone un modelo Gaussiano para explicar la relación entre la abundancia y la temperatura.
Fishing power, efficiency and selection of gillnets for the shortfin grunt (Microlepidotus brevipinnis Steindachner, 1869), in the southern coast of Jalisco, Mexico
Rojo-Vázquez,Jorge A; Arreguín-Sánchez,Francisco; Godínez-Domínguez,Enrique;
Revista de biología marina y oceanografía , 2001, DOI: 10.4067/S0718-19572001000100002
Abstract: gillnet selectivity, fishing power and catch efficiency for microlepidotus brevipinnis (steindachner, 1869) off bahia de navidad, jalisco, mexico, were estimated. field experiments were conducted using gillnets of 7.62 and 8.89 cm of mesh-size, during april 1994 to march 1995. a total of 457 organisms were caught with the 7.62 cm mesh-size, and 592 with the 8.89 mesh-size. results shows gillnet of 8.89 cm mesh size caught 3 cm larger organisms and 110 g more weighted fish than those caught by the 7.62 mesh-size. the 7.62 mesh-size caught 1.9 times organisms and 1.3 more weight than the 7.62 cm mesh-size. selectivity analysis indicates an optimum length (100% probability of retention) was 27.7 cm tl for the 7.62 mesh-size and 32.3 cm tl for the 8.89 cm mesh-size. the relative efficiency analysis was estimated as relative catchability ratio between nets and it varied in a range of 25% to 39% with fish length.
Hábitos alimentarios de tres especies de raya (Rajiformes: Urotrygonidae) en el Pacífico central mexicano
Flores-Ortega, JR;Godínez-Domínguez, E;González-Sansón, G;Rojo-Vázquez, JA;Corgos, A;Morales-Jáuregui, MY;
Ciencias marinas , 2011,
Abstract: stomach contents and dietary overlap of three round stingray species (urobatis halleri, urotrygon munda, and urotrygon rogersi) captured off the central pacific coast of mexico were analyzed during the two main hydroclimatic periods (t1 and t2) that characterize the environmental variability in the area. the three round stingray species showed a narrow bathymetric distribution range, and the highest abundances were located at 20 m depth in both seasons. in general, the diets were mainly composed of benthic microcrustaceans (caridean shrimps) and to a lesser extent of fishes, polychaetes, and molluscs. the most abundant prey items in the diets were carideans of the families processidae and ogyriididae, and penaeids, followed by brachyuran and stomatopod larvae. all three stingrays exhibited a generalist feeding strategy. the diets showed high overlap values during period t1 in both inter- and intraspecies analyses, but lower values during period t2. there was no evidence of ontogenetic diet changes and sex was not a factor for trophic differences. the slight differences among diets were due to seasonal changes in the soft-bottom macrobenthic invertebrate assemblages in the shallow waters, and relationships like predation and competition were not the main factors influencing the population dynamics of the three stingray species.
Ictiofauna de la pesquería ribere a en Bahía de Navidad, Jalisco, México, asociada al evento El Ni o 1997-1998
J.A. Rojo-Vázquez,B. Aguilar-Palomino,V.H. Galván-Pi?a,E. Godínez-Domínguez
Revista de Biología Tropical , 2001,
Abstract: Se cuantificó la ictiofauna obtenida por la pesquería ribere a de Bahía de Navidad, Jalisco, México durante 1998. Se capturaron 6 944 ejemplares distribuidos en 130 especies (3 231 kg). Las familias con mayor número de especies fueron Carangidae, Haemulidae y Sciaenidae. Las especies más importantes en número y biomasa fueron Microlepidotus brevipinnins, Caranx caninus, C. caballus. El máximo número de especies se registró en junio (61), mínimo en marzo (33). En enero se capturó la mayor abundancia (1397 organismos), la menor durante agosto (25). La mayor biomasa fue en enero (556.5 kg), y la menor en agosto (114.7 kg). Dieciocho especies acumularon el 86.7 % de la abundancia total, mientras que 20 especies reúnen el 86.3 % de la biomasa. De igual forma, se encontraron grandes diferencias entre el número de especies, la abundancia y la biomasa capturados en los diferentes tipos de redes The ichthyofauna fished in Bahía de Navidad. Jalisco, Mexico in the Central Pacific was surveyed during 1998. Six thousand nine hundred and fourty-four organisms of 130 species were caught which weighted P. 231 kg. Nearly 30 % of the species belonged to Carangidae, Haemulidae and Sciaenidae. The most important species in number and biomass were Microlepidotus brevipinnins, Caranx caninus and C. caballuso Species number, abundance and biomass fluctuated during the year. The largest number of species was caught in June (61), the minimum in March (33). January had the maximum abundance (1 397 organisms), while the minimum was obtained during August (251). The maximum biomass values were from January (556.5 kg), and the lowest from August (114.7 kg). Eighteen species accumulated 87 % of the total abundance. while 20 species represented 186.3 % of the biomass. There were large in differences species number, abundance and biomass nets of differ lent mesh size
Fish Larvae Response to Biophysical Changes in the Gulf of California, Mexico (Winter-Summer)
Raymundo Avenda?o-Ibarra,Enrique Godínez-Domínguez,Gerardo Aceves-Medina,Eduardo González-Rodríguez,Armando Trasvi?a
Journal of Marine Biology , 2013, DOI: 10.1155/2013/176760
Abstract: We analyzed the response of fish larvae assemblages to environmental variables and to physical macro- and mesoscale processes in the Gulf of California, during four oceanographic cruises (winter and summer 2005 and 2007). Physical data of the water column obtained through CTD casts, sea surface temperature, and chlorophyll a satellite imagery were used to detect mesoscale structures. Zooplankton samples were collected with standard Bongo net tows. Fish larvae assemblages responded to latitudinal and coastal-ocean gradients, related to inflow of water to the gulf, and to biological production. The 19°C and 21°C isotherms during winter, and 29°C and 31°C during summer, limited the distribution of fish larvae at the macroscale. Between types of eddy, the cyclonic (January) registered high abundance, species richness, and zooplankton volume compared to the other anticyclonic (March) and cyclonic (September). Thermal fronts (Big Islands) of January and July affected the species distribution establishing strong differences between sides. At the mesoscale, eddy and fronts coincided with the isotherms mentioned previously, playing an important role in emphasizing the differences among species assemblages. The multivariate analysis indicated that larvae abundance was highly correlated with temperature and salinity and with chlorophyll a and zooplankton volume during winter and summer, respectively. 1. Introduction The biological-physical interactions in the oceans play an important role in determining patterns of horizontal distributions of the plankton communities [1], and these interactions occur at a wide range of temporal and spatial scales [2], being the mesoscale processes such as fronts, eddy, and upwelling, the most determinant factors in the spatial distribution and structure of the zooplankton communities on basin and local scales [3]. Mesoscale oceanographic structures such as eddy and fronts can work as mechanisms of retention and concentration of fish larvae [4–11], and upwelling filaments, including eddy, may work as mechanisms of dispersion [12–17]. The Gulf of California is a semienclosed dynamic sea where strong changes in temperature, salinity, and currents [18] are related to the seasonal flux of the Gulf of California and to tropical surface water masses which provide a unique environment where the southern tropical, subtropical, and northern temperate marine biota develops [19, 20]. The northern region has an anticyclonic circulation most of the year, while in June and September it reverses to a cyclonic eddy [21]. Strong winter upwelling is
Ictiofauna de la pesquería ribere?a en Bahía de Navidad, Jalisco, México, asociada al evento El Ni?o 1997-1998
Rojo-Vázquez,J.A.; Aguilar-Palomino,B.; Galván-Pi?a,V.H.; Godínez-Domínguez,E.; Hernández-Vázquez,S.; Ruiz-Ramírez,S.; Lucano-Ramírez,G;
Revista de Biología Tropical , 2001,
Abstract: the ichthyofauna fished in bahía de navidad. jalisco, mexico in the central pacific was surveyed during 1998. six thousand nine hundred and fourty-four organisms of 130 species were caught which weighted p. 231 kg. nearly 30 % of the species belonged to carangidae, haemulidae and sciaenidae. the most important species in number and biomass were microlepidotus brevipinnins, caranx caninus and c. caballuso species number, abundance and biomass fluctuated during the year. the largest number of species was caught in june (61), the minimum in march (33). january had the maximum abundance (1 397 organisms), while the minimum was obtained during august (251). the maximum biomass values were from january (556.5 kg), and the lowest from august (114.7 kg). eighteen species accumulated 87 % of the total abundance. while 20 species represented 186.3 % of the biomass. there were large in differences species number, abundance and biomass nets of differ lent mesh size
The fish species composition and variation of catch from the small-scale gillnet fishery before, during and after the 1997-1998 ENSO event, central Mexican Pacific
Rojo-Vázquez,J.A; Qui?onez-Velázquez,C; Echavarria-Heras,H.A; Lucano-Ramírez,G; Godínez-Domínguez,E; Ruiz-Ramírez,S; Galván-Pi?a,V.H; Sosa-Nishizaki,O;
Revista de Biología Tropical , 2008,
Abstract: in the tropical and subtropical coastal zone, were highly diverse fish communities occur, it is important to study the small scale fisheries exploiting these communities. for this study, 219 fishing days were carried out in bahia de navidad, jalisco, mexico. four gillnets with different mesh sizes (76.2, 88.9, 101.6 and 114.3 mm) were used for the fishing operations, from april 1994 to march 1995 and from january 1998 to december 2000. a total of 26126 organisms weighting 11680 kg were caught. one hundred and eighty three species belonging to 57 families and 19 orders were identified. ten species accumulated more than 60% of the total abundance and biomass, the remaining species (173) individually contributed with less than 2% of the total abundance and biomass. the most important species in the catch were microlepidotus brevipinnis, caranx caballus, haemulon flaviguttatum, scomberomorus sierra, c. caninus, c. sexfasciatus, lutjanus guttatus and l. argentiventris. the catch per unit of effort showed a large variation during the study, both in number and biomass. on average, 110 fishes and 48.5 kg fishing day-1 were caught. the maximum values were recorded during january and october 1998 (250 fishes and 100 kg fishing day-1), and the minimum values were recorded during september and november 1994 (25 org. and 10 kg fishing day-1). the total abundance and biomass was lower during the 1994-95 period (f=6.16, 8.32, p<0.05). there were statistically significant differences among the annual catch from each gillnet. all the environmental changes caused by the enso event had ecological and economic effects that can be rated from moderate to severe. rev. biol. trop. 56 (1): 133-152. epub 2008 march 31.
Leishmaniasis visceral: veinte a?os de experiencia clínica en población pediátrica en un hospital de referencia en Chiapas
Beltrán Silva, Sandra Luz;Martínez-Domínguez, Rosa;Enríquez-Gallegos, Moisés;Santos-Preciado, José Ignacio;
Boletín médico del Hospital Infantil de México , 2011,
Abstract: background. we undertook this study to describe the clinical experience in diagnosis and treatment of visceral leishmaniasis in patients <15 years of age who were treated from 1990-2010 in the hospital general dr. rafael pascacio gamboa of tuxtla gutiérrez, chiapas. methods. this was a retrospective descriptive study. we reviewed the clinical files and epidemiological reports from the department of pediatrics of the hospital general dr. rafael pascacio gamboa of tuxtla gutiérrez, chiapas. all patients with a diagnosis of visceral leishmaniasis confirmed by serology, indirect immunofluorescence and the presence of amastigotes in the bone marrow aspirate were included. epidemiological and clinical data were collected. results. from 1990-2010, 72 children with the diagnosis of visceral leishmaniasis were reported. nine cases were discarded because necessary data for the analysis were not collected. sixty three subjects who were analyzed were between 2 months and 13 years of age; 56 (88%) were <5 years of age. female:male ratio was 1:1.2. fever was present in 100% of the cases, splenomegaly in 97%, hepatomegaly in 87% and pancytopenia in 95%. serology for leishmania by indirect immunofluorescence was >1:32, positive in 98% of cases. the presence of amastigotes was found in 79% of the bone marrow aspirates. leishmania chagasi was identified in culture medium 3n (nicolle-novy-mcneal) in five children; 75% of the children presented malnutrition. conclusions. in the state of chiapas, diagnosis of visceral leishmaniasis should be considered in patients with fever, hepatosplenomegaly, and pancytopenia. the search for the parasite should be begun early to avoid clinical deterioration and pain, which leads to malnutrition and puts patients at risk of dying.
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