Efectes del retrocés glacial sobre el plàncton de la península antàrtica

1 pageLa península Antàrtica, atesa la seva alta sensibilitat i resposta en terminis relativament curts, ofereix una oportunitat única per l’estudi dels efectes d’un procés de significació global: el retrocés de les seves glaceres. Així mateix, atesa la ubicació del continent antàrtic, els processos en aquesta regió influeixen sobre zones que n’estan allunyadesPeer Reviewe

Use of an Inverse Method for Time Series to Estimate the Dynamics of and Management Strategies for the Box Jellyfish Carybdea marsupialis

14 pages, 6 figures, 2 tables, supporting Information https://doi.org/10.1371/journal.pone.0137272Frequently, population ecology of marine organisms uses a descriptive approach in which their sizes and densities are plotted over time. This approach has limited usefulness for design strategies in management or modelling different scenarios. Population projection matrix models are among themost widely used tools in ecology. Unfortunately, for the majority of pelagic marine organisms, it is difficult to mark individuals and follow themover time to determine their vital rates and built a population projectionmatrixmodel. Nevertheless, it is possible to get time-series data to calculate size structure and densities of each size, in order to determine the matrix parameters. This approach is known as a “demographic inverse problem” and it is based on quadratic programming methods, but it has rarely been used on aquatic organisms.We used unpublished field data of a population of cubomedusae Carybdea marsupialis to construct a population projection matrix model and compare two different management strategies to lower population to values before year 2008 when there was no significant interaction with bathers. Those strategies were by direct removal of medusae and by reducing prey. Our results showed that removal of jellyfish fromall size classes was more effective than removing only juveniles or adults.When reducing prey, the highest efficiency to lower the C. marsupialis population occurred when prey depletion affected prey of all medusae sizes. Our model fit well with the field data and may serve to design an efficient management strategy or build hypothetical scenarios such as removal of individuals or reducing prey. TThis This sdfsdshis method is applicable to othermarine or terrestrial species, for which density and population structure over time are availableThis research was carried out under contract LIFE 08 NAT ES 0064 (to CB and VLF) cofinanced by the European Commission (www. cubomed.eu), the Ministerio de Agricultura, Alimentación y Medio Ambiente, the Dirección General del Agua of the Regional Government of Valencia and the Fundación Biodiversidad. This work was also partially supported by Spanish Ministry of Education and Science co-funded by FEDER This research was carried out under contract LIFE 08 NAT ES 0064 (to CB and VLF) cofinanced by the European Commission (www.cubomed.eu), the Ministerio de Agricultura, Alimentación y Medio Ambiente, the Dirección General del Agua of the Regional Government of Valencia and the Fundación Biodiversidad. This work was also partially supported by Spanish Ministry of Education and Science co-funded by FEDERPeer Reviewe

Applied of actinobacteria consortia-based bioremediation to restore co-contaminated systems

Global industrialization and natural resources extraction have left cocktails of environmental pollutants. Thus, this work focuses on developing a defined actinobacteria consortium able to restore systems co-contaminated with pollutants occurring in Argentinian environments. In this context, five actinobacteria were tested in solid medium to evaluate antagonistic interactions and tolerance against lindane (LIN), Reactive Black B–V (RBV), phenanthrene (Ph) and Cr(VI). The strains showed absence of antagonism, and most of them tolerated the presence of individual pollutants and their mixtures, except Micromonospora sp. A10. Thus, a quadruple consortium constituted by Streptomyces sp. A5, M7, MC1, and Amycolatopsis tucumanensis DSM 45259T, was tested in liquid systems with individual contaminants. The best microbial growth was observed in the presence of RBV and the lowest on Cr(VI). Removals detected were 83.3%, 65.0% and 52.4% for Ph, RBV and LIN, respectively, with absence of Cr(VI) dissipation. Consequently, the consortium performance was tested against the organic mixture, and a microbial growth similar to the biotic control and a LIN removal increase (61.2%) were observed. Moreover, the four actinobacteria of the consortium survived the mixture bioremediation process. These results demonstrate the potential of the defined actinobacteria consortium as a tool to restore environments co-contaminated with organic pollutants.Fil: Antezana, Pablo Edmundo. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Tucumán. Planta Piloto de Procesos Industriales Microbiológicos; ArgentinaFil: Colin, Veronica Leticia. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Tucumán. Planta Piloto de Procesos Industriales Microbiológicos; ArgentinaFil: Bourguignon, Natalia. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Tucumán. Planta Piloto de Procesos Industriales Microbiológicos; ArgentinaFil: Benimeli, Claudia Susana. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Tucumán. Planta Piloto de Procesos Industriales Microbiológicos; Argentina. Universidad Nacional de Catamarca. Facultad de Ciencias Exactas y Naturales; ArgentinaFil: Fuentes, María Soledad. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Tucumán. Planta Piloto de Procesos Industriales Microbiológicos; Argentin

Population, ecology and genetic characteristics of the Mediterrannean box jellyfish Carybdea Marsupialis in the island of Malta

The main aims of this study were to investigate the environmental parameters associated with blooming events of Carybdea marsupialis and to genetically compare the box jellyfish in Malta to other Mediterranean and Atlantic samples. The numbers of adult individuals, as well as abiotic and biotic factors were monitored in situ and analysed statistically. Phenological patterns were determined and the abundance of C. marsupialis at the Maltese sites was shown to be strongly and positively correlated with sea water temperature. Genetic analysis indicated a high degree of homology between the sequences derived from the analysed Mediterranean specimens, which was not apparent in the genetic material derived from specimens from the Eastern Atlantic (Cadiz).peer-reviewe

La evaluación psicológica y su incidencia en el matrimonio, regulado en el código civil, decreto legislativo 295 y sus modificatorias en el distrito de Arequipa-2021

El presente trabajo de investigación denominado; La Evaluación Psicológica y su incidencia en el Matrimonio, regulado en el Código Civil, Decreto Legislativo 295 y sus Modificatorias, distrito de Arequipa-2021. Tuvo como objetivo del estudio proponer en nuestro ordenamiento sustantivo civil, un requisito nuevo, que es pasar una evaluación psicológica, previo a la celebración del matrimonio, esto a efecto de prevenir, disminuir y/o erradicar la violencia de todo tipo en el grupo familiar, resguardando así que no sufra de algún trastorno psicológico alguno de los pretendientes. La metodología empleada en la presente investigación fue enfoque cualitativo y de tipo básico. La parte operativa de esta tesis, ha consistido en la aplicación de una guía de entrevistas semiestructuradas a los abogados litigantes expertos en violencia familiar a efecto de determinar su postura sobre la reforma legal propuesta por los tesistas y una guía de análisis documental. Finalmente, luego de una valoración conjunta del marco conceptual estudiado y de los resultados hallados en las entrevistas y guías, es que se llega a la conclusión que, efectivamente si es posible la modificación legal pretendida y que esto contribuiría a prevenir disminuir y/o erradicar los índices de violencia familiar dentro del matrimonio e igualmente en el grupo familiar y del mismo modo dar mayor soporte a la salud metal de los futuros cónyuges

Niveles de ansiedad y depresión en adolescentes de la Institución Educativa “Abraham Valdelomar” N° 4018, Callao - Perú, 2023

El presente estudio tiene como objetivo: “Determinar el nivel de ansiedad y depresión en los adolescentes de la institución educativa Abraham Valdelomar 4018 Callao 2023”. Método: Cuantitativo, correlacional, de corte transversal no experimental. La población estuvo compuesta por 100 adolescentes, se aplicaron dos instrumentos un cuestionario para medir las variables depresión y ansiedad, ambos instrumentos cuentan con confiablidad y validez. Resultados: indicaron que el 45% se encuentran en un nivel leve de ansiedad y el 35% se encuentran en nivel moderado en depresión, así mismo en relación a la correlación se obtuvo una significancia de P=0.992 Conclusión: Existe relación significativa entre depresión y ansiedad en adolescentes de la Institución educativo Abraham Valdelomar N.4018 Callao

Biostratigraphy based neogene dinoflagellate cysts in northeast of Patagonia, Argentina

This paper presents the biostratigraphic results based on dinoflagellate cysts from two Neogene lithostratigraphic units cropping out in northeastern Patagonia. The Barranca Final Formation, located in the southwestern Colorado Basin, is exposed along the northern coast of San Matías Gulf, Río Negro Province, and the Puerto Madryn Formation in the Península Valdés, Chubut Province. The low-to-moderate diverse dinoflagellate cyst assemblages present are dominated by neritic taxa with subordinate oceanic indicators. Towards the top of both sections, the relative frequencies of the dinoflagellate cyts decrease, whereas acritarchs and continental palynomorphs proportions increase, indicating a shallowing upwards trend. The stratigraphic range of Labrynthodinium truncatum truncatum in the lower part of the Barranca Final Formation indicate age between the late Burdigalian (ca. 16.5 Ma) and the late Tortonian (ca. 7.5 Ma). Labrynthodinium truncatum truncatum and Habibacysta tectata constrain the age of the Puerto Madryn Formation to the Serravalian to Tortonian interval (late middle miocene to early late Miocene). Theses ages are consistent with the 87Sr/86Sr isotopic analysis of the oyster valves at 9.61 and 8.3 and with the 87Sr/86Sr ratios on calcitic shells at about 10 Ma, respectively.O presente artigo inclui resultados bioestratigráficos baseados em cistos de dinoflagelados de duas unidades litoestratigráficas do Neógeno que afloram no nordeste da Patagônia. A Formação Barranca Final, localizada no sudoeste da Bacia do Rio Colorado, que está exposta ao longo da costa norte do Golfo San Matías Golfo, Província de Rio Negro, e a Formação Puerto Madryn na Península Valdés, Província de Chubut. Os conjuntos de dinocistos das seções estudadas exibem uma diversidade moderada a baixa, composta principalmente dos táxons neríticos, com indicadores oceânicos, como Nematosphaeropsis rigida e Impaginidium ssp., sendo apenas subordinados. As frequências relativas de cistos decrescem na porção superior de ambas as secções, enquanto os acritarcas e palinomorfos continentais aumentam suas proporções, indicando uma tendência à redução da profundidade. O intervalo estratigráfico de Labrynthodinium truncatum truncatum na parte inferior da Formação Barranca Final indica idade entre o final do Burdigaliano (ca. 16,5 Ma) e o Tortoniano final (cerca de 7,5 Ma). Labrynthodinium truncatum truncatum, Habibacysta tectata restringe a idade da Formação Puerto Madryn ao intervalo entre o Serravaliano ou Tortoniano (final do Mesomioceno ao Neomioceno). Essas idades são consistentes com as análises isotópicas 87Sr/86Sr das conchas de ostras que resultam em valores de 9,61 e 8,3 e com as proporções de 87Sr/ 86Sr em conchas calcíticas de uns 10 Ma, respectivamente.Fil: Fuentes, Sabrina Natalia. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Parque Centenario. Museo Argentino de Ciencias Naturales "Bernardino Rivadavia"; ArgentinaFil: Guler, Maria Veronica. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Bahía Blanca. Instituto Geológico del Sur. Universidad Nacional del Sur. Departamento de Geología. Instituto Geológico del Sur; ArgentinaFil: Cuitiño, José Ignacio. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Centro Nacional Patagónico; ArgentinaFil: Palazzesi, Luis. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Parque Centenario. Museo Argentino de Ciencias Naturales "Bernardino Rivadavia"; ArgentinaFil: Scasso, Roberto Adrian. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Geociencias Básicas, Aplicadas y Ambientales de Buenos Aires. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Geociencias Básicas, Aplicadas y Ambientales de Buenos Aires; ArgentinaFil: Barreda, Viviana Dora. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Parque Centenario. Museo Argentino de Ciencias Naturales "Bernardino Rivadavia"; Argentin

Dechlorinase activity and chlordane removal by Streptomyces strains as pure and mixed defined cultures

Chlordane (CLD) is a toxic fumigating agent widely used in the past, which is now found in air, soil and water resources. Technical chlordane consists in 147 components, and it has been included in the list of the 12 persistent organic pollutants of Stockholm Convention (2001) because of its persistence, toxicity and tendency to biomagnification. Bioremediation is an attractive cleaning technique of polluted environments. The use of actinobacteria for this purpose, results an effective biotechnological approach due to their metabolic versatility and furthermore their use in mixed cultures can increase the catabolic pathways available for biodegrading these contaminants. The aim of this work was to evaluate the chlordane removal capacity and dechlorinase activity by pure and mixed actinobacteria cultures, under controlled laboratory conditions, and to select one mixed culture for further morphological studies. Streptomyces spp. M7, A2, A5, A6, A13 previously isolated in the laboratory and Streptomyces coelicolor A3 (2) were cultivated individually in minimal medium (MM) with CLD for acclimation. These strains, as pure cultures and consortia from two to six microorganisms, were cultivated in MM with CLD (1.66 mg L-1). Microbial cells were used to obtain cell-free extracts for dechlorinase activity assays and the supernatants of these cultures were used to determine residual CLD by gas chromatography. The selected mixed culture according to their dechlorinase activity and capacity to remove CLD was grown in MM either with glucose or chlordane as carbon source and analyzed at 72 h in an optical microscope the probability of morphological changes. Dechlorinase activity ranged between 0.00 to 1291.28 mmolCl-/h/mg protein and CLD removal percentages was between 82.6 to 95.5%. The mixed culture consisting of Streptomyces sp. A2-A13-Streptomyces coelicolor A3(2) showed the best enzyme activity but not the minimal residual CLD concentration. Because no linear relationship between residual CLD and enzyme activity was obtained, the ratio between these two parameters was evaluated, and the mixed culture Streptomyces sp. A2-A5-A13 with the minimal obtained relationship was selected. In CLD presence, the microscopic analysis of this culture showed scarce vegetative cells and numerous spores, which results of the hyphal fragmentation. These Streptomyces strains were able to grow as mixed cultures, in CLD presence, and showed ability to dechlorinate and remove this toxic compound from the culture medium. Therefore the mixed culture of Streptomyces sp. A2-A5-A13 could be a promising tool for CLD biodegradation.Fil: Fuentes, María Soledad. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Tucumán. Planta Piloto de Procesos Industriales Microbiológicos; ArgentinaFil: Colin, Veronica Leticia. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Tucumán. Planta Piloto de Procesos Industriales Microbiológicos; ArgentinaFil: Raimondo, Enzo Emanuel. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Tucumán. Planta Piloto de Procesos Industriales Microbiológicos; Argentina. Universidad Nacional de Tucumán. Facultad de Bioquímica, Química y Farmacia; ArgentinaFil: Benimeli, Claudia Susana. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Tucumán. Planta Piloto de Procesos Industriales Microbiológicos; Argentina. Universidad del Norte Santo Tomás de Aquino; ArgentinaFil: Amoroso, Maria Julia del R.. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Tucumán. Planta Piloto de Procesos Industriales Microbiológicos; Argentina. Universidad Nacional de Tucumán. Facultad de Bioquímica, Química y Farmacia; ArgentinaIX Congreso Argentino de Microbiología GeneralRosarioArgentinaSociedad Argentina de Microbiología Genera

Concurrent environmental stressors and jellyfish stings impair caged European sea bass (Dicentrarchus labrax) physiological performances

none8siThe increasing frequency of jellyfish outbreaks in coastal areas has led to multiple ecological and socio-economic issues, including mass mortalities of farmed fish. We investigated the sensitivity of the European sea bass (Dicentrarchus labrax), a widely cultured fish in the Mediterranean Sea, to the combined stressors of temperature, hypoxia and stings from the jellyfish Pelagia noctiluca, through measurement of oxygen consumption rates (MO2), critical oxygen levels (PO2crit), and histological analysis of tissue damage. Higher levels of MO2, PO2crit and gill damage in treated fish demonstrated that the synergy of environmental and biotic stressors dramatically impair farmed fish metabolic performances and increase their health vulnerability. As a corollary, in the current scenario of ocean warming, these findings suggest that the combined effects of recurrent hypoxic events and jellyfish blooms in coastal areas might also threaten wild fish populations.openBosch-Belmar, Mar; Giomi, Folco; Rinaldi, Alessandro; Mandich, Alberta; Fuentes, Verónica; Mirto, Simone; Sarà, Gianluca; Piraino, StefanoBosch Belmar, Mar; Giomi, Folco; Rinaldi, Alessandro; Mandich, Alberta; Fuentes, Verónica; Mirto, Simone; Sarà, Gianluca; Piraino, Stefan

Environmental drivers of salp Thalia democratica population dynamics from in situ observations

Author Posting. © The Author(s), 2016. This is the author's version of the work. It is posted here by permission of Inter-Research for personal use, not for redistribution. The definitive version was published in Marine Ecology Progress Series 561 (2016): 189-201, doi:10.3354/meps11915.Thalia democratica blooms are a recurrent phenomenon in many coastal areas of the Mediterranean Sea and have significant ecological effects. To better understand the environmental drivers of salp blooms, we conducted 8 surveys to sample T. democratica in contrasting seasonal, temperature and chlorophyll conditions. In each survey, short-term variations in the abundances of different salp stages were assessed by sampling the same population at 30 min intervals. Using these data, we estimated the parameters in a set of stage-classified matrix population models representing different assumptions about the influence of temperature and chlorophyll on each stage. In the model that best explains our observations, only females are affected by changes in water temperature. Whether this is a direct influence of temperature or an indirect effect reflecting low food availability, female reproduction cessation seems to slow population growth under unfavourable conditions. When conditions become favourable again, females liberate the embryo and change sex to male, allowing for mating under extremely low salp densities and triggering the bloom. In contrast to previous findings, our results suggest that females, rather than oozooids, are responsible for the sustainability of salp populations during latency periods.This work was founded by the Ministerio de Ciencia e Innovación under the Fishjelly project, the European commission ENPI CBC MED project under the Jellyrisk project and the European LIFE Commission under the Cubomed project. M. G. Neubert acknowledges the support of the US National Science Foundation (DEB-1145017 and DEB-1257545)