Hábitos alimenticios de Floridichthys polyommus Hubbs, 1936 (Pisces: Cyprinodontidae) en dos sistemas lagunares costeros

The feeding habits of Floridichthys polyommus (Pisces: Cyprinodontidae) were determined and compared spatially and seasonally between two coastal lagoon systems in Yucatan Peninsula. A total of 445 and 561 stomach contents were analyzed from the lagoons of Puerto Viejo (Quintana Roo) and Chelem (Yucatan), respectively. This specie presents a wide trophic generalization, including 126 alimentary items in Puerto Viejo and 80 in Chelem. It consumes basically microcrustaceans, phytoplankton, and macrophytes. However, trophic preferences were different spatially and seasonally between both systems. In Puerto Viejo F. polyommus feeds on microcrustaceans, whereas in Chelem it consumes phytoplankton. Considering its trophic ontogenetic variation, smaller individuals preyed on microcrustaceans and the larger ones on phytoplankton or macrophytes. In Puerto Viejo, microcrustaceans were the principal and more abundant food during the dry season (35.1%), while during the rainy and cold seasons phytoplankton was the most representative item. Phytoplankton was always the most abundant food in Chelem all year long, with an increase in the dry season (51.6%). Spatial and seasonal trophic variation between both lagoons can be related to the food components availability in each system and to hydrological variability for each season of the year.Se determinaron y compararon espacial y estacionalmente los hábitos alimenticios de Floridichthys polyommus (Pisces: Cyprinodontidae) en dos sistemas lagunares de la península de Yucatán. Se analizaron los contenidos estomacales de 445 y 561 ejemplares correspondientes a las lagunas de Puerto Viejo (Quintana Roo) y Chelem (Yucatán), respectivamente. Esta especie presenta una amplia generalización trófica, incluyendo en su dieta 126 componentes alimenticios en Puerto Viejo y 80 en Chelem. Consume principalmente microcrustáceos, fitoplancton y macrófitas. Sin embargo, las preferencias alimenticias fueron diferentes entre ambos sistemas, tanto espacial como estacionalmente. En Puerto Viejo F. polyommus es un consumidor de microcrustáceos, mientras que en Chelem es fitoplanctófago. Considerando su variación trófica ontogenética, los ejemplares de menor talla se alimentaron principalmente de microcrustáceos y los más grandes de fitoplancton o macrófitas. En Puerto Viejo, esta especie consume principalmente microcrustáceos (35.1%) durante la época de secas, mientras que en lluvias y nortes, el fitoplancton es el más representativo. Este último grupo trófico fue en Chelem el de mayor abundancia durante las tres épocas del año y su valor se incrementó en la época de secas (51.6%). La variación trófica espacial y estacional entre ambas lagunas puede relacionarse con la disponibilidad de los recursos alimenticios en cada sistema, así como con los cambios hidrológicos en cada época climática

Localization of gravity on a de Sitter thick braneworld without scalar fields

In this work we present a simple thick braneworld model that is generated by an intriguing interplay between a 5D cosmological constant with a de Sitter metric induced in the 3-brane without the inclusion of scalar fields. We show that 4D gravity is localized on this brane, provide analytic expressions for the massive Kaluza-Klein (KK) fluctuation modes and also show that the spectrum of metric excitations displays a mass gap. We finally present the corrections to Newton's law due to these massive modes. This model has no naked singularities along the fifth dimension despite the existence of a mass gap in the graviton spectrum as it happens in thick branes with 4D Poincare symmetry, providing a simple model with very good features: the curvature is completely smooth along the fifth dimension, it localizes 4D gravity and the spectrum of gravity fluctuations presents a mass gap, a fact that rules out the existence of phenomenologically dangerous ultralight KK excitations in the model. We finally present our solution as a limit of scalar thick branes.Comment: 11 pages in latex, no figures, title and abstract changed, a new section and some references adde

Juxtaposing BTE and ATE – on the role of the European insurance industry in funding civil litigation

One of the ways in which legal services are financed, and indeed shaped, is through private insurance arrangement. Two contrasting types of legal expenses insurance contracts (LEI) seem to dominate in Europe: before the event (BTE) and after the event (ATE) legal expenses insurance. Notwithstanding institutional differences between different legal systems, BTE and ATE insurance arrangements may be instrumental if government policy is geared towards strengthening a market-oriented system of financing access to justice for individuals and business. At the same time, emphasizing the role of a private industry as a keeper of the gates to justice raises issues of accountability and transparency, not readily reconcilable with demands of competition. Moreover, multiple actors (clients, lawyers, courts, insurers) are involved, causing behavioural dynamics which are not easily predicted or influenced. Against this background, this paper looks into BTE and ATE arrangements by analysing the particularities of BTE and ATE arrangements currently available in some European jurisdictions and by painting a picture of their respective markets and legal contexts. This allows for some reflection on the performance of BTE and ATE providers as both financiers and keepers. Two issues emerge from the analysis that are worthy of some further reflection. Firstly, there is the problematic long-term sustainability of some ATE products. Secondly, the challenges faced by policymakers that would like to nudge consumers into voluntarily taking out BTE LEI

Penilaian Kinerja Keuangan Koperasi di Kabupaten Pelalawan

This paper describe development and financial performance of cooperative in District Pelalawan among 2007 - 2008. Studies on primary and secondary cooperative in 12 sub-districts. Method in this stady use performance measuring of productivity, efficiency, growth, liquidity, and solvability of cooperative. Productivity of cooperative in Pelalawan was highly but efficiency still low. Profit and income were highly, even liquidity of cooperative very high, and solvability was good

Search for stop and higgsino production using diphoton Higgs boson decays

Results are presented of a search for a "natural" supersymmetry scenario with gauge mediated symmetry breaking. It is assumed that only the supersymmetric partners of the top-quark (stop) and the Higgs boson (higgsino) are accessible. Events are examined in which there are two photons forming a Higgs boson candidate, and at least two b-quark jets. In 19.7 inverse femtobarns of proton-proton collision data at sqrt(s) = 8 TeV, recorded in the CMS experiment, no evidence of a signal is found and lower limits at the 95% confidence level are set, excluding the stop mass below 360 to 410 GeV, depending on the higgsino mass

Search for anomalous production of events with three or more leptons in pp collisions at √s = 8TeV

Published by the American Physical Society under the terms of the Creative Commons Attribution 3.0 License. Further distribution of this work must maintain attribution to the author(s) and the published articles title, journal citation, and DOI.A search for physics beyond the standard model in events with at least three leptons is presented. The data sample, corresponding to an integrated luminosity of 19.5fb-1 of proton-proton collisions with center-of-mass energy s=8TeV, was collected by the CMS experiment at the LHC during 2012. The data are divided into exclusive categories based on the number of leptons and their flavor, the presence or absence of an opposite-sign, same-flavor lepton pair (OSSF), the invariant mass of the OSSF pair, the presence or absence of a tagged bottom-quark jet, the number of identified hadronically decaying τ leptons, and the magnitude of the missing transverse energy and of the scalar sum of jet transverse momenta. The numbers of observed events are found to be consistent with the expected numbers from standard model processes, and limits are placed on new-physics scenarios that yield multilepton final states. In particular, scenarios that predict Higgs boson production in the context of supersymmetric decay chains are examined. We also place a 95% confidence level upper limit of 1.3% on the branching fraction for the decay of a top quark to a charm quark and a Higgs boson (t→cH), which translates to a bound on the left- and right-handed top-charm flavor-violating Higgs Yukawa couplings, λtcH and λctH, respectively, of |λtcH|2+|λctH|2<0.21

Measurement of associated W plus charm production in pp collisions at √s=7 TeV

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