Social organization of marine Tucuxi dolphins, Sotalia guianensis, in the Cananeia Estuary of southeastern Brazil

Social organization is an important component of the population biology of a species that influences gene flow, the spatial pattern and scale of movements, and the effects of predation or exploitation by humans. An important element of social structure in mammals is group fidelity, which can be quantified through association indices. To describe the social organization of marine tucuxi dolphins (Sotalia guianensis) found in the Cananeia estuary, southeastern Brazil, association indices were applied to photo-identification data to characterize the temporal stability of relationships among members of this population. Eighty-seven days of fieldwork were conducted from May 2000 to July 2003, resulting in direct observations of 374 distinct groups. A total of 138 dolphins were identified on 1-38 distinct field days. Lone dolphins were rarely seen, whereas groups were composed of up to 60 individuals (mean +/- 1 SD = 12.4 +/- 11.4 individuals per group). A total of 29,327 photographs were analyzed, of which 6,312 (21.5%) were considered useful for identifying individuals. Half-weight and simple ratio indices were used to investigate associations among S. guianensis as revealed by the entire data set, data from the core study site, and data from groups composed of <= 10 individuals. Monte Carlo methods indicated that only 3 (9.3%) of 32 association matrices differed significantly from expectations based on random association. Thus, our study suggests that stable associations are not characteristic of S. guianensis in the Cananeia estuary.

Symptomatic expression of depression among Jewish adolescents: effects of gender and age

Background Depression symptomatology was assessed with the Beck Depression Inventory (BDI) in a sample of Jewish adolescents, in order to compare the frequency and severity of depression with non-Jewish adolescents as well as examine gender difference of the expression of depressive symptomatology. Method Subjects comprised 475 students from Jewish private schools, aged 13-17 years, who were compared with an age-matched non-Jewish sample (n = 899). Kendall`s definition was adopted to classify these adolescents according to level of depressive symptoms. The frequency of depression was calculated for ethnicity, gender and age strata. Discriminant analysis and principal component analysis were performed to assess the importance of depression-specific and non-specific items, along with the factor structure of the BDI, respectively. Results The overall mean score on the BDI in the Jewish and the non-Jewish sample was 9.0 (SD = 6.4) and 8.6 (SD = 7.2), respectively. Jewish girls and boys had comparable mean BDI scores, contrasting with non-Jewish sample, where girls complained more of depressive symptoms than boys (p < 0.001). The frequency of depression, adopting a BDI cutoff of 20, was 5.1% for the Jewish sample and 6.3% for the non-Jewish sample. The frequency of depression for Jewish girls and boys was 5.5% (SE = 1.4) and 4.6% (SE = 1.5), respectively. On the other hand, the frequency of depression for non-Jewish girls and boys was 8.4% (SE = 1.2) and 4.0% (SE = 1.0), respectively. The female/male ratio of frequency of BDI-depression was 1.2 in the Jewish sample, but non-Jewish girls were twice (2.1) as likely to report depression as boys. Discriminant analysis showed that the BDI highly discriminates depressive symptomatology among Jewish adolescents, and measured specific aspects of depression. Factor analysis revealed two meaningful factors for the total sample and each gender (cognitive-affective dimension and somatic dimension), evidencing a difference between Jewish boys and Jewish girls in the symptomatic expression of depression akin to non-Jewish counterparts. Conclusions Ethnic-cultural factor might play a role in the frequency, severity and symptomatic expression of depressive symptoms in Jewish adolescents. The lack of gender effect on depression, which might persist from adolescence to adulthood among Jewish people, should be investigated in prospective studies.

The genotoxic effects of DNA lesions induced by artificial UV-radiation and sunlight

Solar radiation sustains and affects all life forms on Earth. The increase in solar UV-radiation at environmental levels, due to depletion of the stratospheric ozone layer, highlights serious issues of social concern. This becomes still more dramatic in tropical and subtropical regions where radiation-intensity is still higher. Thus, there is the need to evaluate the harmful effects of solar UV-radiation on the DNA molecule as a basis for assessing the risks involved for human health, biological productivity and ecosystems. In order to evaluate the profile of DNA damage induced by this form of radiation and its genotoxic effects, plasmid DNA samples were exposed to artificial-UV lamps and directly to sunlight. The induction of cyclobutane pyrimidine dimer photoproducts (CPDs) and oxidative DNA damage in these molecules were evaluated by means of specific DNA repair enzymes. On the other hand, the biological effects of such lesions were determined through the analysis of the DNA inactivation rate and mutation frequency, after replication of the damaged pCMUT vector in an Escherichia coli MBL50 strain. The results indicated the induction of a significant number of CPDs after exposure to increasing doses of UVC, UVB, UVA radiation and sunlight. Interestingly, these photoproducts are those lesions that better correlate with plasmid inactivation as well as mutagenesis, and the oxidative DNA damages induced present very low correlation with these effects. The results indicated that DNA photoproducts play the main role in the induction of genotoxic effects by artificial UV-radiation sources and sunlight. (C) 2010 Elsevier B.V. All rights reserved.

Circadian phase and intertrial interval interfere with social recognition memory

A modified version of the social habituation/dis-habituation paradigm was employed to examine social recognition memory in Wistar rats during two opposing (active and inactive) circadian phases, using different intertrial intervals (30 and 60 min). Wheel-running activity was monitored continuously to identify circadian phase. To avoid possible masking effects of the light-dark cycle, the rats were synchronized to a skeleton photoperiod, which allowed testing during different circadian phases under identical lighting conditions. In each trial, an infantile intruder was introduced into an adult`s home-cage for a 5-minute interaction session, and social behaviors were registered. Rats were exposed to 5 trials per day for 4 consecutive days: oil days I and 2, each resident was exposed to the same intruder; on days 3 and 4, each resident was exposed to a different intruder in each trial. I he resident`s social investigatory behavior was more intense when different intruders were presented compared to repeated presentation of the same intruder, suggesting social recognition memory. This effect was stronger when the rats were tested during the inactive phase and when the intertrial interval was 60 min, These findings Suggest that social recognition memory, as evaluated in this modified habituation/dis-habituation paradigm, is influenced by the circadian rhythm phase during which testing is performed, and by intertrial interval. (C) 2008 Elsevier Inc. All rights reserved.

The effects of taxing truck distance on CO2 emissions from transports in retailing

To finance transportation infrastructure and to address social and environmental negative externalities of road transports, several countries have recently introduced or consider a distance based tax on trucks. In the competitive retail market such tax can be expected to lower the demand and thereby reduce CO2 emissions of road transports. However, as we show in this paper, such tax might also slow down the transition towards e-tailing. Considering that previous research indicates that a consumer switching from brick-and-mortar shopping to e-tailing reduces her CO2 emissions substantially, the direction and magnitude of the environmental net effect of the tax is unclear. In this paper, we assess the net effect in a Swedish regional retail market where the tax not yet is in place. We predict the net effect on CO2 emissions to be positive, but off-set by about 50% because of a slower transition to e-tailing.

Analysis Of Semi-Distributed And Global Hydrological Models In The Central Tropical Basins Of The Gulf Of Mexico To The Effects Of Extreme Hydrometeorological Phenomena

In the last years extreme hydrometeorological phenomena have increased in number and intensity affecting the inhabitants of various regions, an example of these effects are the central basins of the Gulf of Mexico (CBGM) that they have been affected by 55.2% with floods and especially the state of Veracruz (1999-2013), leaving economic, social and environmental losses. Mexico currently lacks sufficient hydrological studies for the measurement of volumes in rivers, since is convenient to create a hydrological model (HM) suited to the quality and quantity of the geographic and climatic information that is reliable and affordable. Therefore this research compares the semi-distributed hydrological model (SHM) and the global hydrological model (GHM), with respect to the volumes of runoff and achieve to predict flood areas, furthermore, were analyzed extreme hydrometeorological phenomena in the CBGM, by modeling the Hydrologic Modeling System (HEC-HMS) which is a SHM and the Modèle Hydrologique Simplifié à I'Extrême (MOHYSE) which is a GHM, to evaluate the results and compare which model is suitable for tropical conditions to propose public policies for integrated basins management and flood prevention. Thus it was determined the temporal and spatial framework of the analyzed basins according to hurricanes and floods. It were developed the SHM and GHM models, which were calibrated, validated and compared the results to identify the sensitivity to the real model. It was concluded that both models conform to tropical conditions of the CBGM, having MOHYSE further approximation to the real model. Worth mentioning that in Mexico there is not enough information, besides there are no records of MOHYSE use in Mexico, so it can be a useful tool for determining runoff volumes. Finally, with the SHM and the GHM were generated climate change scenarios to develop risk studies creating a risk map for urban planning, agro-hydrological and territorial organization.

Previdencia social no Brasil: por uma reforma mais duradoura

A reforma da previdência social tem sido uma preocupação de vários países: tanto no mundo desenvolvido como no em desenvolvimento. A motivação básica é o esgotamento do modelo de repartição, devido a fatores demográficos: queda de natalidade e aumento da longevidade. Analisando o fenômeno do esgotamento, o artigo propugna pela adesão, tal como no bem sucedido caso chileno, do sistema de capitalização.

How does corruption hurt growth? Evidences about the effects of corruption on factors productivity and per capita income

Corruption is a phenomenon that plagues many countries and, mostly, walks hand in hand with inefficient institutional structures, which reduce the effectiveness of public and private investment. In countries with widespread corruption, for each monetary unit invested, a sizable share is wasted, implying less investment. Corruption can also be a burden on a nation’s wealth and economic growth, by driving away new investment and creating uncertainties regarding private and social rights. Thus, corruption can affect not only factors productivity, but also their accumulation, with detrimental consequences on a society’s social development. This article aims to analyze and measure the influence of corruption on a country’s wealth. It is implicitly admitted that the degree of institutional development has an adverse effect on the productivity of production factors, which implies in reduced per capita income. It is assumed that the level of wealth and economic growth depends on domestic savings, foster technological progress and a proper educational system. Corruption, within this framework, is not unlike an additional cost, which stifles the “effectiveness” of the investment. This article first discusses the key theories evaluating corruption’s economic consequences. Later, it analyzes the relation between institutional development, factor productivity and per capita income, based on the neoclassical approach to economic growth. Finally, it brings some empirical evidence regarding the effects of corruption on factor productivity, in a sample of 81 countries studied in 1998. The chief conclusion is that corruption negatively affects the wealth of a nation by reducing capital productivity, or its effectiveness.

Transparência, a resposta institucional à pressão social: o caso do Tribunal de Contas do Estado do Rio de Janeiro

The present work aims to identify emerging organizational changes in the Court of Accounts of the State of Rio de Janeiro - TCE/RJ that are happening in the contemporary scenery known as the Age of Information. The search for the comprehension of the institutional dynamics is oriented by concepts originated from the theory of complexity, which believe that the public services external control system can be understood in a political, technical and legal environment with growing levels of learning and innovation. While chasing the possible causes of these changes, we try to prove the hypothesis that the TCE/RJ is turning into a more transparent organization. For this purpose, we define the outlines and reaches of the principle of transparency, based in bibliographical and documental researches, and analyze the phenomenon perceived in a explanation research through semi-structured interviews performed with two groups: a sample representing the universe under jurisdiction entities top level directors and the other obtained in the universe of formal and informal leaderships existing in the educational body of the institution. The conclusion of the present work confirms the initial questions, indicating that the organization is really becoming more and more transparent. The social-technical changes that are happening today at the TCE/RJ are caused by the growing social pressure for more effective results in the control of public expenditures. Under the systemic point of view, we observe cracks in the protective bell-glass that evolves the institution - previously hermetic to the external contingencies and that works today as a SAC - Adaptive Complex System. Aspects such as organization structural changes, the introduction of strategic planning and the growing democratization of the decision process are producing a new organizational culture. The seniority of the Technical Headcount contributes to establish the pre-conditions for the development of a administration where the participation of the TCE/RJ technical employees adds importance to its development as an institution that generates republican effects in the society from its less hermetic decision process.

O regime geral de previdência social: diagnósticos estruturais críticos e proposta de reformas

Since the last decade of the past century and further, there have been increased, polemic discussions in Brazil that are also occurring simultaneously in the rest of the world: the sustainability of public pension systems. The Brazilian system, which is denominated as the General Regimen of Social Welfare and was established in a distribution regimen, is becoming a growing source of expenditures for the Federal Government and is contributing to the increasing of its fiscal deficit. This situation started to decline after the promulgation of the Federal Constitution in 1988, in which actions had been established reflecting the feeling of ¿social debt¿ existing in the country by that time after years of economic growth without yield redistribution. Thus, benevolent rules had been instituted that provided an assistancialist character to the program, making it unsustainable when it is seen by the internationally accepted premise of the pension system as social insurance with perpetual duration. In consequence, there was an explosive growth of the financial needs of the system reaching the equivalent of 1.63% of the Gross Domestic Product in 2005. In this sense, many arguments in favor of revision and reforms in the current model had solidified, resulting, in 1998, in some changes in the contribution rules of the diverse sectors of society, as well as in the concession of benefit rules. However, such changes had not obtained significant effects since the main source of the imbalance, which is essentially structural, was not attacked. Therefore, this research seeks to diagnose some of the most structural points in the current public pension system in Brazil and evaluate what can be done in terms of reforms to turn the program into balance again and in restore harmony with its conceptual objectives.

Ações de responsabilidade social das empresas - a percepção do consumidor e sua influência na motivação de compra - um estudo de caso

The social responsibility is being very considered by the organizations and it has been exercising important impact in your strategies. More companies are confronting if with the obligation of incorporating, spontaneously or for pressure of groups and segments, the social responsibility to your profit objectives. Although some defend that the responsibility of the private companies in the public area is limited to the payment of taxes and the execution of the laws, they increase the arguments that your role cannot be restricted to that field, even for a subject of survival of the own companies. It is believed that the consumers passed to value behaviors in that sense and to prefer products of identified companies as ethics and socially responsible. Besides, it is believed that with that performance socially concemed, the company develops values and practices with positive effects on your productive chain and your collaborators, generating better results. The present study had for objective to verify the social actions practiced by O Boticário they are noticed by your consuming public to the point of to take them the purchase decision. The mischievous field research to effect allowed to conclude that such actions are not noticed by your consumers and, therefore, it doesn't motivate them the purchase of the products of the company

Relacionando o comprometimento organizacional e a responsabilidade social corporativa

A competitividade e a responsabilidade social têm sido temas de constante discussão nos meios acadêmicos e econômicos. De um lado, as empresas buscam a competitividade através da eficiência, da excelência e da melhora constante de desempenho. Este desempenho, conforme já colocado por Bateman e Strasser (1984), encontra entre suas bases o comprometimento dos empregados com a sua organização. De outro lado, a sociedade, e todos os grupos nela atuantes, cobram de maneira cada vez mais forte e ampla que as empresas ajam de forma socialmente responsável. Neste sentido, o presente trabalho buscou analisar um modelo de comprometimento organizacional e um de responsabilidade social corporativa que fornecessem as bases para a compreensão desses dois construtos e as possíveis relações entre eles. A partir dos modelos estudados, obtiveram-se quatro grupos de interesse para os quais as atividades de responsabilidade social corporativa podem ser direcionadas – stakeholders sociais e não sociais, empregados, consumidores e governo – e três dimensões do comprometimento organizacional – afetiva, normativa e instrumental. Através de análises de correlação e de regressão linear simples e algumas ponderações teóricas, concluiu-se que, para a amostra obtida, as atividades de responsabilidade social corporativa voltadas aos empregados e aos consumidores possuem relação positiva com os comprometimentos afetivo e normativo, enquanto que as ações de responsabilidade social corporativa voltadas a stakeholders sociais e não sociais e ao governo possuem relação direta apenas com o comprometimento afetivo. As demais relações entre a variável dependente e independente se mostraram inexistentes. Desta forma, este trabalho propõe que os gestores das organizações, conhecedores dos possíveis efeitos benéficos sobre o comprometimento organizacional de seus empregados e, conseqüentemente, seus resultados e desempenho, atuem no sentido de esclarecer e melhorar a percepção de seus empregados sobre as atividades de responsabilidade social corporativa. Além de aprofundar o conhecimento sobre as causas e antecedentes do comprometimento organizacional, acredita-se que os resultados demonstrados possam direcionar as organizações em suas ações de conscientização sobre responsabilidade social corporativa de forma mais efetiva.

Income and bargaining effects on education and health

In this paper, we examine the impacts of the reform in the rural pension system in Brazil in 1991 on schooling and health indicators. In addition, we use the reform to investigate the validity of the unitary model of household allocation by testing if there were uneven impacts on those indicators depending on the gender of the recipient. The main conclusion of the paper is that the reform had significantly positive effects on the outcomes of interest, especially on those co-residing with a male pensioner, indicating that the unitary model is not a well-specified framework to understand family allocation decisions. The highest impacts were on school attendance for boys, literacy for girls and illness for middle-age people. We explore a collective model as defined by Chiappori (1992) as one possible alternative representation for the decision-making process of the poor rural Brazilian families. In the cooperative Nash equilibrium, the reform effects can be divided into two pieces: a direct income effect and bargaining power effect. The data support the existence of these two different effects

Bounds on functionals of the distribution treatment effects

Bounds on the distribution function of the sum of two random variables with known marginal distributions obtained by Makarov (1981) can be used to bound the cumulative distribution function (c.d.f.) of individual treatment effects. Identification of the distribution of individual treatment effects is important for policy purposes if we are interested in functionals of that distribution, such as the proportion of individuals who gain from the treatment and the expected gain from the treatment for these individuals. Makarov bounds on the c.d.f. of the individual treatment effect distribution are pointwise sharp, i.e. they cannot be improved in any single point of the distribution. We show that the Makarov bounds are not uniformly sharp. Specifically, we show that the Makarov bounds on the region that contains the c.d.f. of the treatment effect distribution in two (or more) points can be improved, and we derive the smallest set for the c.d.f. of the treatment effect distribution in two (or more) points. An implication is that the Makarov bounds on a functional of the c.d.f. of the individual treatment effect distribution are not best possible.

Peer effects na educação no Brasil: evidência a partir dos dados do SAEB

Este trabalho estima o efeito das Interações Sociais no desempenho dos estudantes no Brasil, a partir dos dados do SAEB 2005. Os resultados apontam que Peer Effects explicam uma parte importante da proficiência observada no exame de Matemática. Além disto, encontramos evidências de que este efeito é concentrado nos alunos no topo da distribuição de habilidade, o que sugere que políticas de ability tracking podem ser ótimas.