Composición y variación anual de la taxocenosis de cladóceros (Crustacea: Anomopoda y Ctenopoda) planctónicos y química del agua de la laguna Don Tomás (La Pampa, Argentina)

Variations in the taxonomic composition and densities of the species of the community of planktonic cladocerans of a low salinity pond of La Pampa province were analyzed over a one year period on the basis of monthly samplings. Diversity and species richness were higher than in other provincial water bodies, probably ow into the low salinity of this water body. Nine species were recorded: Moina micrura Kurz, 1874, Bosmina huaronensis Delachaux, 1918, Afona sp. Baird, 1843, Macrothrix sp. Baird, 1843, Leydigia feydigi Schoedler, 1863, Ceriodaphnia cf. Dubia Richard, 1895, Daphnia cf.obtusa Kurz,1874, Daphnia spinufata Birabén, 1917 y Diaphanosoma birgei Korínek, 1981. Although the planktonic species B. huaronensis was dominant, the ticoplankter Afona sp. also attained high densities. D. birgei, registered in other ponds of the province with different physical and chemical characteristics was also recorded in the studied pondo Most of the detected species were small, probably owing to the effect of selective predation by fish.Se analizó la variación en la composición taxonómica y densidad de las especies de la comunidad de c1adóceros planctónicos de una laguna de baja salinidad de la provincia de La Pampa, mediante muestreos mensuales a lo largo de un ciclo anual. La diversidad y la riqueza específica fueron mayores que en otros ambientes provinciales, probablemente debido al bajo contenido de sales del agua. Se registraron nueve especies: Moina micrura Kurz, 1874, Bosmina huaronensis Delachaux, 1918, Afona sp. Baird, 1843, Macrothrix sp. Baird, 1843, Leydigia leydigi Schoedler, 1863, Ceriodaphnia cf. dubia Richard, 1895, Daphnia cf. obtusa Kurz, 1874, Daphnia spinulata Birabén, 1917 y Diaphanosoma birgei Korínek, 1981. Se verificó el predominio de B. huaronensis, especie típicamente planctónica, pero el ticoplanctonte Alona sp. también alcanzó densidades muy altas. Se menciona la presencia de D. birgei, especie que había sido registrada en cuerpos de agua de la provincia con características físico-químicas distintas a las de esta laguna. La mayor parte de las especies detectadas fue de pequeño tamaño, probablemente debido al efecto de la predación selectiva por parte de peces

Cladoceros limnéticos de la provincia de La Pampa (Argentina)

In this contribution we report the presence of 10 species belonging to the families Sididae, Daphnidae, Moinídae, Bosminidae and Chydoridae found in temporary and permanent water bodies of La Pampa province (Argentina).En esta contribución se da a conocer la presencia de diez especies pertenecientes a las familias Sídidae, Daphynídae, Moinídae, Bosminidae y Chydoridae en distintos cuerpos de agua temporarios y permanentes de la provincia de La Pampa (Argentina)

Diffraction effects on light-atomic ensemble quantum interface

We present a simple method to include the effects of diffraction into the description of a light-atomic ensemble quantum interface in the context of collective variables. Carrying out a scattering calculation we single out the purely geometrical effect. We apply our method to the experimentally relevant case of Gaussian shaped atomic samples stored in single beam optical dipole traps and probed by a Gaussian beam. We derive analytical scaling relations for the effect of the interaction geometry and compare our findings to results from 1-dimensional models of light propagation.Comment: 13 pages, 7 figures, comments welcom

Heterodyne non-demolition measurements on cold atomic samples: towards the preparation of non-classical states for atom interferometry

We report on a novel experiment to generate non-classical atomic states via quantum non-demolition (QND) measurements on cold atomic samples prepared in a high finesse ring cavity. The heterodyne technique developed for the QND detection exhibits an optical shot-noise limited behavior for local oscillator optical power of a few hundred \muW, and a detection bandwidth of several GHz. This detection tool is used in single pass to follow non destructively the internal state evolution of an atomic sample when subjected to Rabi oscillations or a spin-echo interferometric sequence.Comment: 23 page

Homozygous C-terminal loss-of-function NaV1.4 variant in a patient with congenital myasthenic syndrome

No abstract availabl

Associations of ostracods in shallow lakes in the northeast of La Pampa province (Argentina)

Los lagos someros son frecuentes en La Pampa. Aunque muchas características de su biota son conocidas, la información sobre la distribución y ecología de los ostrácodos es escasa, a pesar de su importancia como indicadores biológicos y en actuopaleontología. El objetivo de este estudio es conocer la composición taxonómica, la densidad de ostrácodos y sus relaciones con parámetros ambientales en lagos del noreste de La Pampa. Se estudiaron cinco lagos desde septiembre de 2016 hasta marzo de 2017. Se tomaron muestras de sedimentos superficiales e in situ se midieron: conductividad, temperatura y transparencia y se tomaron muestras para determinar salinidad, pH y composición iónica. Los lagos difirieron en su salinidad, composición iónica y transparencia. Se registraron diez taxa, algunos hallados previamente en la provincia de Buenos Aires (Heterocypris similis, Heterocypris incongruens, Cypridopsis vidua y Chlamydotheca incisa), la cuenca de Llancanelo (H. incongruens y C. vidua) y lagos del norte de Patagonia (C. incisa, C. vidua, Potamocypris unicaudata, H. incongruens y Amphicypris argentiniensis). Se comprobó la influencia de la salinidad ya que algunas especies (A. argentinensis, Limnocythere rionegroensis y Limnocythere titicaca) se encontraron sólo en el lago más salino. La existencia en La Pampa de tres ecorregiones diferentes (Llanura Pampeana, Espinal y Estepa Patagónica) y la presencia en los lagos estudiados de ostrácodos del noroeste argentino (L. titicaca), de la llanura bonaerense (H. similis, H. incongruens) y otras de Patagonia (L. rionegroensis), permitiría afirmar que los lagos de La Pampa están en una zona de transición entre faunas diferentes.Shallow lakes are common in the center of Argentina. Although many characteristics of its biota are known, information on the distribution and ecology of ostracods is scarce despite their importance as biological indicators and in actuopaleontology. The objective of this study was to determine the taxonomic composition, the density of ostracods, and their relationships with environmental parameters in lakes in the northeast of La Pampa. Five aquatic ecosystems were studied from September 2016 to March 2017. Samples of superficial sediments were collected, and conductivity, temperature, and transparency were measured in situ. Water samples were collected to determine salinity, pH, and ionic composition. The lakes differed in salinity, ionic composition, and transparency. Ten taxa were registered, some previously found in the province of Buenos Aires (Heterocypris similis, Heterocypris incongruens, Cypridopsis vidua, and Chlamydotheca incisa), the Llancanelo basin (H. incongruens and C. vidua), and North Patagonia lakes (C. incisa, C. vidua, Potamocypris unicaudata, H. incongruens, and Amphicypris argentiniensis). The influence of salinity was verified because some species (A. argentinensis, Limnocythere rionegroensis, and Limnocythere titicaca) were found only in the most saline lake. The existence in La Pampa of three different ecoregions (Pampean Plains, Espinal, and Patagonian Steppe) and the presence of ostracods in the studied lakes of northwestern Argentina (L. titicaca), the Buenos Aires province plain (H. similis, H. incongruens), and Patagonia (L. rionegroensis) allowed for affirming that the lakes of La Pampa are in a transition zone among different ostracods faunas.Fil: Kihn, Romina Gisela. Consejo Nacional de Investigaciones Científicas y Técnicas. Instituto de Ciencias de la Tierra y Ambientales de La Pampa. Universidad Nacional de La Pampa. Facultad de Ciencias Exactas y Naturales. Instituto de Ciencias de la Tierra y Ambientales de La Pampa; ArgentinaFil: Echaniz, Santiago Andrés. Universidad Nacional de La Pampa. Facultad de Ciencias Exactas y Naturales; ArgentinaFil: Vignatti, Alicia María. Universidad Nacional de La Pampa. Facultad de Ciencias Exactas y Naturales; ArgentinaFil: Cabrera, Gabriela Cecilia. Universidad Nacional de La Pampa. Facultad de Ciencias Exactas y Naturales; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; ArgentinaFil: Stella, Cesar A.. Museo Provincial de Ciencias Naturales; Argentin

Hamiltonian Design in Atom-Light Interactions with Rubidium Ensembles: A Quantum Information Toolbox

We study the coupling between collective variables of atomic spin and light polarization in an ensemble of cold 87Rb probed with polarized light. The effects of multiple hyperfine levels manifest themselves as a rank-2 tensor polarizability, whose irreducible components can be selected by means of probe detuning. The D1 and D2 lines of Rb are explored and we identify different detunings which lead to Hamiltonians with different symmetries for rotations. As possible applications of these Hamiltonians, we describe schemes for spin squeezing, quantum cloning, quantum memory, and measuring atom number.Comment: 6 pages, 4 figures; added reference

Prospects for photon blockade in four level systems in the N configuration with more than one atom

We show that for appropriate choices of parameters it is possible to achieve photon blockade in idealised one, two and three atom systems. We also include realistic parameter ranges for rubidium as the atomic species. Our results circumvent the doubts cast by recent discussion in the literature (Grangier et al Phys. Rev Lett. 81, 2833 (1998), Imamoglu et al Phys. Rev. Lett. 81, 2836 (1998)) on the possibility of photon blockade in multi-atom systems.Comment: 8 page, revtex, 7 figures, gif. Submitted to Journal of Optics B: Quantum and Semiclassical Optic

Cambios en la diversidad y variación interanual de la abundancia del zooplancton de un lago somero urbano de La Pampa

Don Tomás is an urban, turbid and hypereutrophic shallow lake located in the west side of Santa Rosa. As it has an important silverside population (Odontesthes bonariensis) this lake is important for recreational and touristic activities. As many changes in many limnological parameters were observed, including zooplankton composition and abundance between 1995-96 and 2006, the main objective of this research was to compare these parameters with the ones obtained from September 2008 to August 2009. Salinity decreased along the three periods from 1.65 (1995-96) to 0.65 g.l-1 (2008-09) mainly due to the city runoff and the constant water pumping for irrigation. Water transparency also decreased from 0.24 (1995-96) to 0.14 m (2008-09). Zooplankton total richness did not change, but changes in taxonomical composition were observed when groups were separately analyzed (cladoceran richness decreased and rotifers increased during 2006. Cladoceran richness decreased from 9 species in 1995-96 to 4 in 2006, to only 2 species in 2008-2009. The same pattern was observed with copepod richness which decreased from 4 species in 2006 to only 2 species in 2008-09. Rotifer richness, on the other hand, increased from 8 species (1995-96) to 15 (2008-2009). The decreased water transparency could have been due to the lack of Daphnia (observed only in 1995-96) and the increased dominance of rotifers. Total zooplankton abundance showed important inter-annual differences, being the lowest in 2006. The obtained results reveal the wide variability of zooplankton in this type of environment.Instituto de Limnología "Raúl A. Ringuelet

Cambios en la diversidad y variación interanual de la abundancia del zooplancton de un lago somero urbano de La Pampa

Don Tomás is an urban, turbid and hypereutrophic shallow lake located in the west side of Santa Rosa. As it has an important silverside population (Odontesthes bonariensis) this lake is important for recreational and touristic activities. As many changes in many limnological parameters were observed, including zooplankton composition and abundance between 1995-96 and 2006, the main objective of this research was to compare these parameters with the ones obtained from September 2008 to August 2009. Salinity decreased along the three periods from 1.65 (1995-96) to 0.65 g.l-1 (2008-09) mainly due to the city runoff and the constant water pumping for irrigation. Water transparency also decreased from 0.24 (1995-96) to 0.14 m (2008-09). Zooplankton total richness did not change, but changes in taxonomical composition were observed when groups were separately analyzed (cladoceran richness decreased and rotifers increased during 2006. Cladoceran richness decreased from 9 species in 1995-96 to 4 in 2006, to only 2 species in 2008-2009. The same pattern was observed with copepod richness which decreased from 4 species in 2006 to only 2 species in 2008-09. Rotifer richness, on the other hand, increased from 8 species (1995-96) to 15 (2008-2009). The decreased water transparency could have been due to the lack of Daphnia (observed only in 1995-96) and the increased dominance of rotifers. Total zooplankton abundance showed important inter-annual differences, being the lowest in 2006. The obtained results reveal the wide variability of zooplankton in this type of environment.Instituto de Limnología "Raúl A. Ringuelet