oalib
Search Results: 1 - 10 of 100 matches for " "
All listed articles are free for downloading (OA Articles)
Page 1 /100
Display every page Item
Macroalgas submareales de la bahía de Todos Santos, Baja California, México
Aguilar-Rosas, Raúl;Aguilar-Rosas, Luis E.;ávila Serrano, Guillermo E.;González Yajimovich, óscar;Becerril Bobadilla, Francisco;
Revista mexicana de biodiversidad , 2010,
Abstract: in order to identify and characterize the species composition of the subtidal zone of the todos santos bay, baja california, mexico, benthic marine macroalgae were sampled at 7 sites from 1995 to 2000. as a result of 25 scuba at derds for the study area, of which faucheocolax attenuata setchell and r.l moe minium parvum are new to the marine flora of pacific mexico. we include a research that consider the macroalpths between 3 and 33 m we found a total of 150 species of macroalgae for the study area, of which 10 are chlorophyta, 26 phaeophyta and 114 rhodophyta; 47 species represent new recogae in the todos santos bay and a discussion on the composition of species found, its vertical distribution and reproduction, particularly the species epiphytes and parasites present in the study area.
Algas marinas bentónicas de Todos Santos, Baja California Sur, México  [cached]
Luz Elena Mateo Cid,A. Catalina Mendoza González
Acta botánica mexicana , 1994,
Abstract: Se presentan los resultados obtenidos del estudio de las algas marinas bentónicas de Todos Santos, Baja California Sur, en aguas del Pacífico mexicano, durante 1989. La lista florística se acompa a de datos sobre las especies presentes en el área de estudio, el estado reproductivo, el modo y el epifitismo. Se determinaron 5 taxa de Cyanophyceae, 69 de Rhodophyceae, 20 de Phaeophyceae, 8 de Bacillariophyceae y 15 de Chlorophyceae. La ficoflora de Todos Santos es tropical y se encontró más diversa en oto o e invierno que en primavera y verano. Las Rhodophyceae dominaron en términos de diversidad. Se discute la presencia de las especies en relación con la temperatura, corrientes y mareas.
Winter and Summer Evaluation of Bacteriological Water Quality at Recreational Beaches along Todos Santos Bay, Baja California, Mexico  [PDF]
María Victoria Orozco-Borbón, Efraín A. Gutiérrez-Galindo, Luis. F. Navarro-Olache, Vinicio Macías-Zamora, Celia Pérez-Capetillo, Albino Mu?oz-Barbosa
Advances in Microbiology (AiM) , 2014, DOI: 10.4236/aim.2014.415123
Abstract: Water bacteriological qualities of 22 recreational beaches in Ensenada Bay, Baja California, Mexico were analyzed during the summer and winter of 2008. Total and fecal coliforms as well as enterococci bacteria were used as pollution indicators. Results showed that bacteria concentrations were higher in winter than summer, associated with Southern California rainy season. Bacteria loads in winter exceeded both the daily and monthly standards showing a clear effect of storm water runoff in the quality of Todos Santos Bay recreational beaches. Statistical analysis showed significant differences between bacteria concentration during summer and winter. The general behavior of the indicators based on daily and monthly standards from high to low was enterococci > FC > TC> total/fecal ratio. Water discharged from 3 sewage treatment plants were responsible for the pollution observed at stations, when the uptake capacity of plants exceeded the storage. During summer pollution was due to non-programmed discharges from sewage treatment plants.
Mass media, espacio y tiempo en Todos Santos, Baja California Sur  [cached]
Rossana Almada
Espiral , 2001,
Abstract: El artículo que aquí se sintetiza es un primer acercamiento, desde la perspectiva de autores entre los que destaca Manuel Castells, a un proyecto mayor que pretende analizar e interpretar el proceso de transformaciones que ha venido sufriendo el pueblo de Todos Santos, Baja California Sur BCS, debido a la llegada de dos contingentes de inmigrantes: el primero, rocedente de Estados Unidos y Canadá, llegó a comprar las casas del centro del pueblo; algunos con la intención de quedarse e instalar negocios, principalmente de venta de Bienes Raíces, otros, para pasar allí la temporada oto o invierno; y el segundo, traído del interior del país, principalmente de Acayucan Veracruz y de Ocotepec Guerrero como jornaleros agrícolas por una compa ía Sinaloense. Esta inmigración ha introducido a Todos Santos dentro de lo que Castells denomina como sociedad red, es decir, dentro de procesos sociales organizados, cada vez más, en torno a redes que constituyen las nuevas formas de organización social. En resumen, el presente trabajo aborda los efectos de la globalización en la transformación de un pueblo sudcaliforniano, a través de la llegada de los inmigrantes arriba mencionados y del uso de los medios de comunicación vía satélite.
Isópodos litorales y de aguas someras de la bahía de Todos los Santos, Baja California, México
Campos, Ernesto;Villarreal, Guillermo;
Revista mexicana de biodiversidad , 2008,
Abstract: a checklist of the free-living isopods of todos los santos bay, baja california, is presented on the basis of allochronic collections made between 1988 and 2005 along the rocky, sandy, and muddy intertidal and sandy subtidal to 256 meters deep. we collected 26 of the 48 species known from the californian province: 2 asellota; 7 cymothoida; 1 oniscoidea; 7 sphaeromatidea; 9 valvifera. the most abundant species were excirolana linguifrons (richardson, 1899), (sandy mesolitoral), idotea fewkesi richardson, 1905 and i. resecata stimpson 1857, (rocky intertidal), haliophasma geminatum menzies and barnard, 1959, (muddy intertidal and subtidal associated with the eel grass zostera marina), and caecognathia crenulatifrons (monod, 1926) (sublitoral). all the recorded species were found in similar marine biotopes in california, usa. of the 26 species, 7 are recorded for the first time in mexico, extending their southern distribution to todos los santos bay. these are: erichsonella crenulata menzies, 1950, exosphaeroma amplicauda (stimpson 1857), e. octonum (richardson, 1899), idarcturus allelomorphus menzies y barnard, 1959, i. fewkesi, janiralata davisi menzies, 1951 and paracerceis gilliana (richardson, 1899).
Isópodos litorales y de aguas someras de la bahía de Todos los Santos, Baja California, México Littoral and shallow water isopods from Todos los Santos Bay, Baja California, Mexico  [cached]
Ernesto Campos,Guillermo Villarreal
Revista mexicana de biodiversidad , 2008,
Abstract: Se presenta una lista de los isópodos de vida libre de la bahía de Todos los Santos con base en recolecciones alocrónicas realizadas entre 1988 y 2005 en el intermareal rocoso, arenoso y limo-arcilloso así como en el sublitoral arenoso hasta una profundidad de 256 m. Se recolectaron 26 especies de las 48 registradas para la Provincia Californiana: 2 Asellota; 7 Cymothoida; 1 Oniscoidea; 7 Sphaeromatidea; 9 Valvifera Las especies más abundantes fueron Excirolana linguifrons (Richardson, 1899), (mesolitoral arenoso), Idotea fewkesi Richardson, 1905 junto con Idotea resecata Stimpson, 1857, (mesolitoral rocoso), Haliophasma geminatum Menzies et Barnard, 1959 (mesolitoral e infralitoral arcilloso asociada al pasto marino Zostera marina Linnaeus) y Caecognathia crenulatifrons (Monod, 1926), (sublitoral). Las especies recolectadas se ha registrado en biotopos marinos similares de California, Estados Unidos de América. De las 26 especies encontradas 7 son primeros registros para México: Erichsonella crenulata Menzies, 1950, Exosphaeroma amplicauda (Stimpson 1857), E. octonum (Richardson, 1899), Idarcturus allelomorphus Menzies et Barnard, 1959, Idotea fewkesi, Janiralata davisi Menzies, 1951 y Paracerceis gilliana (Richardson, 1899), extendiendo su distribución sure a hasta la bahía de Todos los Santos. A checklist of the free-living isopods of Todos los Santos Bay, Baja California, is presented on the basis of allochronic collections made between 1988 and 2005 along the rocky, sandy, and muddy intertidal and sandy subtidal to 256 meters deep. We collected 26 of the 48 species known from the Californian province: 2 Asellota; 7 Cymothoida; 1 Oniscoidea; 7 Sphaeromatidea; 9 Valvifera. The most abundant species were Excirolana linguifrons (Richardson, 1899), (sandy mesolitoral), Idotea fewkesi Richardson, 1905 and I. resecata Stimpson 1857, (rocky intertidal), Haliophasma geminatum Menzies and Barnard, 1959, (muddy intertidal and subtidal associated with the eel grass Zostera marina), and Caecognathia crenulatifrons (Monod, 1926) (sublitoral). All the recorded species were found in similar marine biotopes in California, USA. Of the 26 species, 7 are recorded for the first time in Mexico, extending their southern distribution to Todos los Santos Bay. These are: Erichsonella crenulata Menzies, 1950, Exosphaeroma amplicauda (Stimpson 1857), E. octonum (Richardson, 1899), Idarcturus allelomorphus Menzies y Barnard, 1959, I. fewkesi, Janiralata davisi Menzies, 1951 and Paracerceis gilliana (Richardson, 1899).
Comparación de modelos de transporte de sedimento en la Bahía Todos Santos, Baja California, México
Sánchez, Alberto;Carriquiry, José;Barrera, Jorge;López-Ortiz, B. Estela;
Boletín de la Sociedad Geológica Mexicana , 2009,
Abstract: to determine residual sediment transport in the bay of todos santos (bts), grain size trend analysis were compared and applied utilizing models of sunamura and horikawa (1971), mc laren and bowles (1985), and gao and collins(1994). the sunamura-horikawa model uses grain-size and sorting for comparison criteria to infer sediment transport whereas the models of mc laren-bowles and the gao-collins use these two parameters and also asymmetry. the first two models mentioned are one-dimensional while the third model is two-dimensional. the model of gao and collins (1994) turned out to be most satisfactory model for determining patterns of dispersion of surface sediments. in the bts, the pattern of dispersion showed several sediment transport tendencies. in the north zone of the bay the transport was in a se direction (following the isobath contour of 20 m), and towards the ne (near the island of todos santos). for the south zone transport displayed a ne direction, while the central region of the bay displayed a westerly transport direction. in the canyon of todos santos a ne trajectory was determined. the presence of currents with speeds of 0.30 ms-1 makes transport possible towards the interior part of the bay. in the external region of the bay, in front of the islands of todos santos and the peninsula of punta banda, the inferred transport is towards the w. for the shallow zones, the superficial circulation and the coastal transport agree with previous published results and compare well with the present work. the tide processes (current residuals or internal waves) are an important factor in the resuspension and transport of material in the deep zones of the bay. the central zone of the bay seems to be a convergence site and can give rise to particle stagnation in the bay (e.g., polluting agents).
Presence of Sargassum horneri at Todos Santos Bay, Baja California, Mexico: Its Effects on the Local Macroalgae Community  [PDF]
Giuliana I. Cruz-Trejo, Silvia E. Ibarra-Obando, Luis E. Aguilar-Rosas, Miriam Poumian-Tapia, Elena Solana-Arellano
American Journal of Plant Sciences (AJPS) , 2015, DOI: 10.4236/ajps.2015.617271
Abstract: To describe the annual cycle of Sargassum horneri in Mexican waters, we selected two sites differing in their degree of wave exposure and sediment type: Rincón de Ballenas (RB), and Rancho Packard (RP). From June 2009 to April 2010 we followed the seasonal changes in S. horneri density and biomass along two intertidal transects per site. The effects of this non-indigenous species on the local macroalgae community were assessed by comparing their species composition, density, biomass, species richness, and diversity index in quadrats with and without S. horneri. There were significant differences in S. horneri density and biomass between sites (P < 0.001). At RB the invasive alga density average was 2 ± 0.94 individual m-2, with a mean biomass of 4 ± 0.95 g DW m-2. At RP, S. horneri density average was 10 ± 0.96 individual m-2, and mean biomass of 102 ± 0.97 g DW m-2. At RB, the invasive alga promoted a significant reduction in the four selected structural variables, and the corticated macrophytes and the foliose functional forms were severely reduced. At RP, there were only marginally significant effects (P = 0.06) of S. horneri presence on the local macroalgae community, and higher density, biomass, and diversity values were found when S. horneri was present. Most of the functional forms were found, even if the invasive alga was present. At both locations, the highest biomass corresponded to the articulated calcareous functional form. These contrasting results could be due to the fact that the native macroalgae community has already been altered by the early invasion of S. muticum, with the most resilient species and functional forms remaining in place. One of the most important changes we noticed is the severe reduction of the canopy forming species at both sites.
Relative viable fecundity in the red lobster Panulirus interruptus (Randall, 1840) in Baja California, Mexico Fecundidad Viable Relativa de la langosta roja Panulirus interruptus (Randall, 1840) en Baja California, México
Eugenio Díaz-Iglesias,Marysabel Báez-Hidalgo
Hidrobiológica , 2010,
Abstract: The fundamental objective of this work is to estimate the Relative Viable Fecundity as the number of phylosomes born alive during hatching of the spawn, per longitude of the cephalothorax per female, of Panulirus interruptus in Baja California, Mexico, under laboratory conditions, with goals for its application on the culturing of the specie. The zones of origin of the spawning females were: Bahía Todos Santos, Punta Baja and Isla de Cedros, Baja California, México. From the females between 62.0-97.2 Lc (mm), an average of 224,402 live phylosomes were obtained up to 3 days after hatching. The Relative Viable Fecundity resulted between 900.1-6,922.8 phylosomes/Lc (mm), with a mean of 2 795 phylosomes/Lc (mm). The relationship between the cephalothorax length (mm) and the number of phylosomes resulted: Phylosomes = 0.0083 Lc (mm)3.9046; r2 = 0.615. The Relative Viable Fecundity estimated for this work resulted greater than that currently reported in the literature for Jasus edwardsii. El objetivo del estudio fue estimar la Fecundidad Viable Relativa como el número de filosomas nacidas vivas o eclosión, por Longitud cefalotórax (Lc) por hembra, de Panulirus interruptus en Baja California, México, en condiciones de laboratorio, con vistas a su aplicación en sistemas de cría de la especie. Las zonas de procedencia de las hembras frezadas fueron: Bahía Todos Santos, Punta Baja y la Isla de Cedros, Baja California, México. De las hembras entre 62.0-97.2 Lc (mm), se obtuvieron un promedio de 224,402 filosomas vivas hasta 3 días después de eclosionar. La Fecundidad Viable Relativa resultó entre 900.16,922.8 filosomas/Lc (mm) con una media de 2,795 filosomas/Lc (mm). La relación entre la longitud cefalotórax Lc (mm) y el número de filosomas resultó: Filosomas = 0.0083 Lc (mm)3.9046 ; r2 = 0.615. La Fecundidad Viable Relativa estimada para este trabajo resultó mayor que la reportada hasta la fecha por la literatura para Jasus edwardsii.
Baja California disjunctions and phylogeographic patterns in sympatric California blennies  [PDF]
Giacomo Bernardi
Frontiers in Ecology and Evolution , 2014, DOI: 10.3389/fevo.2014.00053
Abstract: Baja California disjuncts, which are marine species that are present in the northern Sea of Cortez and along the Pacific Coast of California and Baja California, but absent from the south, have been shown to be interesting models of allopatric speciation. While at least 19 species of fish are Baja California disjuncts, no study has ever evaluated the genetic patterns of closely related species. Here, we used three sympatric California blennies (genus Hypsoblennius), where two species have disjunct populations and one does not. Based on one mitochondrial and one nuclear molecular marker, we found that the two disjunct species exhibit different genetic patterns, one species showing disjunct populations as reciprocally monophyletic assemblages, while the other species showed evidence of gene flow between disjunct populations. In addition, the non-disjunct species, H. gilberti, exhibits high gene flow along the California and Baja California coasts. I hypothesized that adult habitat and historical vicariant events, more so than pelagic larval duration, played major roles in shaping the currently observed distribution and genetic patterns for these species.
Page 1 /100
Display every page Item


Home
Copyright © 2008-2017 Open Access Library. All rights reserved.