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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
11

A agenda de altos executivos brasileiros

Lewit, Alessandra Catran 13 November 2013 (has links)
Submitted by Alessandra Lewit (alessandra.lewit@gmail.com) on 2013-12-10T18:01:55Z No. of bitstreams: 1 AGENDA.09.12.2013.pdf: 1373091 bytes, checksum: 96ef859fbd16e2bce0235f9704d504e4 (MD5) / Approved for entry into archive by Janete de Oliveira Feitosa (janete.feitosa@fgv.br) on 2013-12-17T11:29:23Z (GMT) No. of bitstreams: 1 AGENDA.09.12.2013.pdf: 1373091 bytes, checksum: 96ef859fbd16e2bce0235f9704d504e4 (MD5) / Approved for entry into archive by Marcia Bacha (marcia.bacha@fgv.br) on 2013-12-19T16:33:01Z (GMT) No. of bitstreams: 1 AGENDA.09.12.2013.pdf: 1373091 bytes, checksum: 96ef859fbd16e2bce0235f9704d504e4 (MD5) / Made available in DSpace on 2013-12-19T16:33:12Z (GMT). No. of bitstreams: 1 AGENDA.09.12.2013.pdf: 1373091 bytes, checksum: 96ef859fbd16e2bce0235f9704d504e4 (MD5) Previous issue date: 2013-11-13 / Importa quem é o executivo do topo de uma organização? Esta simples pergunta tem recebido diferentes respostas na literatura de liderança. Parte dos estudiosos argumenta que tais executivos estão tão coagidos por seus ambientes (fatores externos e internos à organização) que têm pouca habilidade para afetar o desempenho organizacional. Por outro lado, resultados dos últimos anos geram evidências convincentes sobre o efeito do executivo do topo no desempenho organizacional. O presente estudo, apesar das restrições existentes na literatura sobre altos executivos, defende a influência destes indivíduos na eficácia da organização que comandam. Seu principal objetivo é identificar e analisar como é feita a priorização das atividades que norteiam o cotidiano do executivo que ocupa o primeiro nível na hierarquia das organizações e de que forma variáveis como tempo de mandato, relação de propriedade com a organização e gênero podem influenciar nos critério de priorização de trabalho. Parte integrante do projeto de um grupo de pesquisadores que há mais de treze anos está na área de Política de Empresas da IAE Business School, em conjunto com a PricewaterhouseCoopers, utiliza-se o método indutivo de pesquisa, com referência no esquema teórico criado e testado por Carrera, Caldart e Cornejo (2011), como base para a construção de um modelo de liderança adaptado à cultura brasileira. O trabalho de campo é conduzido com 100 altos executivos brasileiros de organizações de diversos setores, tamanhos e regiões. O estudo revela que existem similaridades e diferenças na forma como o alto executivo brasileiro concebe sua agenda. Seus resultados sugerem que variáveis como gênero, tempo de experiência e relação de propriedade com a organização demonstram ter influência direta no critério de priorização das atividades de altos executivos brasileiros. Verifica-se um gap entre o que altos executivos brasileiros entendem ser importante, e o que realmente fazem na prática, além da alta demanda por tempo que acaba por sacrificar o espaço reservado para questões pessoais e familiares. Desmistifica-se o folclore do perfil do gestor reflexivo e planejador que reside no imaginário de muitos ao constatar que 41% do tempo do alto executivo brasileiro é dedicado a uma agenda não planejada. Implicações teóricas e práticas dos resultados são explicitadas, além de sugestões para pesquisas futuras. Espera-se que este seja o ponto de partida para uma análise longitudinal que viabilize a investigação da influência do contexto político-econômico-cultural no qual o alto executivo está inserido com seu estilo de liderança.
12

CEO Icon to GOP Hopeful: A Quantitative Analysis Exploring Politically Motivated Celebrity CEOs

Crighton, Lindsay 01 June 2011 (has links)
This study examined the perceptions of celebrity CEOs potentially transitioning to political candidates. Using Carly Fiorina's campaign for Senator of California, this study identified how young voters perceive celebrity CEOs as politicians, their identification of celebrity CEOs, and the evaluations of CEOs and their companies. Results indicate a more favorable evaluation of Fiorina resulted in a more favorable reaction to Hewlett- Packard. Results also confirm the use of media messages to prime young voters about political candidates. Finally, political party affiliation was found to significantly influence the findings of this study while gender and political cynicism did not. Theoretical implications and areas of future research in celebrity and politics are discussed. / Master of Arts
13

The moderating influence of competitive intensity on the relationship between CEOs’ regulatory foci and SME internationalization

Adomako, Samuel, Opoku, R.A., Frimpong, K. 2017 February 1923 (has links)
Yes / The international business literature has mainly focused on the impact of top managers' psychological attributes on firms' strategic decisions. However, the potential moderating influence of industry conditions such as competition has not been well explored. Deriving insights from the regulatory focus and upper echelons theories, this paper extends the international business and regulatory focus literature by investigating how the impact influence of CEOs' regulatory foci on firms' degree of internationalization depends on the intensity of competitive market conditions. Using primary data gathered from 289 small and medium-sized enterprises (SMEs) in Ghana, the findings of the study revealed when competition is intense in the domestic market, the potency of a CEO's promotion focus as a driver of internationalization is amplified. In addition, the research shows that intense domestic market competition weakens the negative influence of a CEO's prevention focus on a firm's degree of internationalization. These findings have important research and managerial implications for international business.
14

CEOs' regulatory foci and firm-level product innovativeness in competitive environments

Adomako, Samuel 06 May 2017 (has links)
No / Purpose: Using arguments from the regulatory focus and upper echelons theories, this paper aims to examine the impact of a chief executive officer’s (CEO’s) regulatory foci (i.e. promotion and prevention focus) on small- and medium-sized enterprises’ (SMEs’) level of innovativeness and how these relationships are jointly moderated by intense competition. Design/methodology/approach: The empirical analysis draws on survey data gathered from 257 SMEs in Ghana. Findings: The study findings indicate that a CEO’s level of promotion focus positively affects the firm’s engagement in innovation, while a CEO’s prevention focus is negatively associated with the firm’s innovativeness. The positive association between a CEO’s promotion focus and a firm’s innovativeness is enhanced under conditions of intense competition. Additionally, the negative relationship between prevention focus and firm-level innovativeness is attenuated under intense competition. Research limitations/implications: This study relied on a single informant and also used subjective measures for the dependent variable. As such, individual respondents might have biased perspectives on firm-level product innovativeness. Future studies may use multiple informants to examine the causal links of the variables. Practical implications: The study’s findings provide managers with a deeper understanding of how to achieve superior firm-level product innovation. The understanding of this issue can promote the development and maintenance of further entrepreneurial ventures in emerging economies. Originality/value: The paper has a strong theoretical value as it pioneers research on the effect of CEOs’ regulatory foci on firm-level innovativeness in competitive environments.
15

An exploratory study of CEO practices in an emerging economy

Johnson, Omobola January 2013 (has links)
This study of CEOs in Nigeria sought to discover the practices that CEOs engaged in as relevant and effective in an emerging economy. Twenty eight CEOs of national and expatriate extraction running national and multi-national companies were interviewed to understand their experiences of the contextual influences of an emerging economy and how this impacted what they did, ie. their practices. In support of contingency theories that seek to explain how effective leadership is the result of appropriateness of fit between particular behaviours and particular situations , CEO practices in an emerging economy were found to be attributable to the macro influences of an emerging economy, discovered in the Nigerian environment to include: - undue government influence, unwholesome competitor practices, short supply of skills and talent, inadequate social and physical infrastructure, a large untapped market and poor government capacity to implement policies and laws. The inclusion of previously unresearched but potentially relevant meso and micro influences of company type and CEO nationality status led to the discovery of additional CEO practices that were perceived to be relevant in an emerging economy context and the attribution of differences in CEO practices to the individual or combined influence of these contexts. A conceptual model derived from the findings of this study provided a new understanding of the relationship between the macro influences of an emerging economy, the meso influence of company type and the micro influence of CEO nationality status on CEO practices and the intended outcomes of those practices. Practical knowledge about the development of business leaders in an emerging economy has been extended as a result of deeper insights into the contextually influenced and relevant CEO practices in an emerging economy.
16

Branding CEOs : how relationship between chief executive officers, corporate brands and stakeholders image can influence perceived brand value

Bendisch, Franziska January 2010 (has links)
Chief Executive Officers (CEOs) have become recognised as brands in the academic and popular domain, but little is known about the relationship between these senior manager 'brands' and the corporate brand of the organisation they represent. Since stakeholders associate the CEO's reputation with that of the company, they may negatively or positively affect each other, and there is little research into this dynamic. Indeed there is only a limited understanding about the field of people branding in general and much less into CEO brands in particular. Consequently this doctoral thesis investigates the people and CEO brands phenomena, the relationships between CEO, corporate brand and stakeholder's self-image and how these can be effectively managed in order to enhance brand equity for the company. Based on a critical realist perspective, this research examines traditional product brand elements from the literature and develops a new conceptual framework for people brands, which is subsequently applied to CEOs. Furthermore a survey is performed with business school students. The findings are analysed by using content analysis, descriptive statistics and by developing and testing a Structural Equation Model. The contribution to knowledge is threefold. Firstly a conceptual framework of people brands is constructed. Second this model is applied to CEO brands. Third five propositions about stakeholder perceptions of CEO brand differentiation and equity are empirically tested. The main findings are that visual presentation is not the main factor to differentiate CEO brands from each other, nor is their association with the company. Positive perceptions of corporate brands can influence the reputation of the CEO brand and lead to an enhancement of their brand equity. Importantly this indicates that stakeholders do not distinguish between CEO and company. Brand equity is also created if there is a relationship between stakeholder self-image and company brand, which in turn can improve the reputation of the CEO brand. Finally brand equity is enhanced through stakeholder perceptions of an ideal self-image. Overall this research has important implications for academia and managerial practice as it extends the knowledge about people and CEO brands and provides an insight into ways in which the relationships between CEO, company and stakeholders can be managed to enhance brand equity for the company
17

Les déterminants de la rémunération des plus hauts dirigeants exécutifs des entreprises françaises cotées au SBF120 / Determinants of CEO remuneration of French Listed companies on the SBF 120

Amar-Sabbah, Anne 26 November 2012 (has links)
Notre recherche s'intéresse aux déterminants de la rémunération des plus hauts dirigeants exécutifs des entreprises françaises cotées au SBF 120. Ce sujet trouve tout son intérêt du fait de la survenue de scandales liés aux montants de rémunération des dirigeants et dans un contexte national marqué par un fort tabou quant à cette question. Pour traiter de notre problématique, nous mobilisons le cadre de la théorie de l'agence complété par des approches permettant de prendre en compte le rôle actif des dirigeants dans la fixation de leurs montants de rémunération (théorie du pouvoir managérial et théorie de l'enracinement). Notre démarche empirique s'inscrit dans une perspective exploratoire en contexte français. Une première étape a consisté, par une étude qualitative, à préciser notre angle de recherche afin de dégager des hypothèses par l'administration d'entretiens semi-directifs et de questionnaires auprès des dirigeants. Ceci a permis de faire émerger des relations entre la performance boursière et économique passées des entreprises (en « t »), le pouvoir du dirigeant, le contrôle du conseil et de l'actionnariat et le montant de rémunération en espèces des dirigeants (salaire et bonus) (en « t +1 »). Nos résultats montrent l'absence de relation entre la performance boursière et économique passées de l'entreprise et le montant de rémunération en espèces des plus hauts dirigeants exécutifs. Par ailleurs des mécanismes de contrôle du conseil et de l'actionnariat externes (administrateurs indépendants et investisseurs institutionnels) affecteraient positivement la rémunération en espèces des dirigeants / Our research focuses on the determinants of CEO remuneration for French companies listed on the SBF 120. This topic is of crucial importance because of the occurrence of scandals about the amounts of CEO compensation and in a national context characterized by a strong taboo on this issue. To address this problem, we mobilize the framework of the agency theory complemented by approaches that take into account the active role of CEOs in setting their remuneration amounts (managerial power theory and entrenchment theory). Our empirical approach is exploratory in the French context. A first step consists, thanks to a qualitative study, in clarifying our terms of research to generate hypotheses by administering semi-structured interviews and questionnaires with CEOs. This has led to the emergence of relationships between past corporate stock market and economic performance (in "t"), CEO power, the control of the Board of Directors and shareholders and the amount of CEO cash remuneration (salary and bonus) (in "t+1"). Our results show no relationship between corporate stock market and economic performance and the amount of CEO cash remuneration. We found a positive and significant relationship between the control of the Board of Directors and shareholders independent directors and institutional investors) and the amount of CEO cash remuneration. Finally, the CEO power positively and significantly affects their amount of cash remuneration
18

Uma abordagem gen?mica no estudo da hist?ria demogr?fica da popula??o de baleias jubarte (Megaptera novaeangliae) do Atl?ntico sul ocidental

Emerim, J?lia Dworakowski 29 September 2016 (has links)
Submitted by Caroline Xavier (caroline.xavier@pucrs.br) on 2017-05-12T17:02:20Z No. of bitstreams: 1 DIS_JULIA_DWORAKOWSKI_EMERIM_COMPLETO.pdf: 1877908 bytes, checksum: 2a3d9dd67d62d1577dfa5b5e156dff40 (MD5) / Made available in DSpace on 2017-05-12T17:02:20Z (GMT). No. of bitstreams: 1 DIS_JULIA_DWORAKOWSKI_EMERIM_COMPLETO.pdf: 1877908 bytes, checksum: 2a3d9dd67d62d1577dfa5b5e156dff40 (MD5) Previous issue date: 2016-09-29 / Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior - CAPES / Currently there are seven recognized reproductive stocks (A-G) of humpback whales (Megaptera novaeangliae) in the southern hemisphere. The breeding stock 'A' spreads along the Brazilian coast (between 5 ? and 23 ? S) and the Abrolhos Bank- BA is the main breeding area of the Southwest Atlantic Ocean. During the commercial whaling period (early 20th century) the breeding stock ?A? had reached nearly of 2% of its historical size. Recent researches, using different techniques to study the demographic history, have found different values for recent and historical abundance for this population. The knowledge about population size at specific times and its dynamics during time is very important to draw conservations strategies. Here we sequenced a ddRADseq library of 25 DNA samples extracted from tissues of individuals from the Brazilian humpback whales population. The data suggests absence of population structure in the population. The analysis with 5145 locus with migrate-n estimated the genetic diversity of the population as 0.00237 in per site, indicating an effective size of approximately 40,000 and a census size ~140,000. The ABC approach (Approximate Bayesian Computation), used to test different demographic scenarios related to the commercial whaling period, supported a constant population scenario (<10 generations) (against scenarios with population changes in this period) corroborating previous studies using microsatellites and a few nuclear loci. The Ne estimated in the constant scenario was similar to that obtained with the migrate-n method. Finally, the skyline plot obtained with the migrate-n suggests an increase in the effective size of more than an order of magnitude extending for hundreds of thousands of generation in the past. This very long time frame suggests that this estimate may actually reflects the population size of a metapopulation covering the entire Southern Hemisphere or even entire species, a hypothesis that needs to be tested with the addition of other populations and appropriate demographic scenarios. / Atualmente s?o reconhecidos sete estoques reprodutivos (A-G) de baleias jubarte (Megaptera novaeangliae) no hemisf?rio sul. O estoque reprodutivo ?A? estende-se ao longo costa brasileira (entre 5? e 23? S) sendo o Banco de Abrolhos-BA a principal ?rea de reprodu??o do oceano atl?ntico sul para a esp?cie. Durante o per?odo de ca?a baleeira comercial (in?cio do s?culo XX) sugere-se que esse estoque tenha sofrido um grande impacto populacional chegando a aproximadamente 2% do seu tamanho original. Pesquisas recentes, utilizando diferentes t?cnicas para estudo da hist?ria demogr?fica, t?m apresentado controv?rsias acerca dos valores de abund?ncia recente e hist?rico para essa popula??o. Para o delineamento de estrat?gias de conserva??o ? de grande import?ncia o conhecimento a diversidade gen?tica e as poss?veis flutua??es populacionais ao longo do tempo e em determinados per?odos. No presente estudo fez-se o sequenciamento de 25 amostras de DNA extra?das de tecido de indiv?duos da popula??o Brasileira de baleias jubarte, atrav?s da constru??o de bibliotecas de ddRADseq e sequenciamento de nova gera??o. Os dados evidenciam a aus?ncia de estrutura??o populacional na popula??o. A an?lise com 5145 locos com o migrate-n estimou a diversidade gen?tica desta popula??o em 0.00237 por s?tio, que indica um tamanho efetivo de aproximadamente 40.000 e tamanho censit?rio de ~140.000. A abordagem de ABC (Approximate Bayesian Computation), usando ~mil locos nucleares, aplicada para testar diferentes cen?rios demogr?ficos relacionados ao per?odo de ca?a apontou para um cen?rio de popula??o recente (<10 gera??es) constante (contra cen?rios com altera??es populacionais neste per?odo) corroborando estudos pr?vios utilizando microssat?lites e poucos loci nucleares. A estimativa para o Ne no cen?rio constante foi semelhante ao obtido com o migrate-n. Por fim, o skyline plot obtido com o migrate-n sugere um aumento do tamanho efetivo de mais de uma ordem de magnitude se estendendo por centenas de milhares de gera??o, o que sugere que esta estimativa pode na verdade refletir o tamanho populacional de uma da metapopula??o abrangendo todo o hemisf?rio sul ou mesmo toda a esp?cie, hip?tese que precisa ser testada com a adi??o de outras popula??es e cen?rios demogr?ficos apropriados.
19

Estudo sazonal do metabolismo intermedi?rio e do balan?o oxidativo de Hyalella kaingang (Crustacea, Hyalellidae) em ambiente natural

Braghirolli, Fernando Machado 09 February 2015 (has links)
Submitted by Setor de Tratamento da Informa??o - BC/PUCRS (tede2@pucrs.br) on 2015-07-07T13:22:11Z No. of bitstreams: 1 471669 - Texto Completo.pdf: 642214 bytes, checksum: 15f92d44ec9d54a455925b6917080ee4 (MD5) / Made available in DSpace on 2015-07-07T13:22:11Z (GMT). No. of bitstreams: 1 471669 - Texto Completo.pdf: 642214 bytes, checksum: 15f92d44ec9d54a455925b6917080ee4 (MD5) Previous issue date: 2015-02-09 / Conselho Nacional de Pesquisa e Desenvolvimento Cient?fico e Tecnol?gico - CNPq / Currently, the execution of biological research that is able to classify and characterize the biodiversity and its ecological relations has been increasingly important and necessary in order to achieve environmental conservation. Conservation physiology is concerned about studying and qualifying many variables related to an organism, so that is possible to increase the knowledge about the functioning of a given species and to detail main environmental requirements or to establish periods of natural vulnerability. The genus Hyalella presents an American distribution and has a great importance on the food chain where it occurs, and becoming a fundamental link in processes of energy transference. The amphipod Hyalella kaingang, a very recent described species and so far not very studied, was used on this study of seasonal variation, and the objective of the present work was to analyze the metabolic behavior, the metabolic allocation, the levels of lipid peroxidation and the activity of antioxidant enzymes of the species. Thirty animals from each sex were used each season of the year, which were collected at Centro de Pesquisa e Conserva??o da Natureza (CPCN) Pr?-Mata, located at S?o Francisco de Paula, Rio Grande do Sul.In the field, animals were euthanized by cryoanesthesia and in the laboratory they were homogenized in order to quantify levels of total proteins, glycogen, lipids, triglycerides, glycerol lipid peroxidation and the activity of the antioxidant enzymes superoxide dismutase, catalase and glutathione S- transferase. There was significative difference in the levels of glycogen, lipids, triglycerides, lipoperoxidation and in the activity of the enzymes superoxide dismutase and glutathione S-transferase over a full seasonal cycle in both males and females. The results of biomarkers from energetic metabolism and from oxidative stress indicate a feeding trend directed to the ingestion of proteins, and it is also suggested that the reproductive period of the species may be long-lasting, with this hypothesis being based also on the observation of pregnant females in many of the analyzed seasons. It is also suggested that there may be a reproductive peak during autumn. However, more studies must be done with this species so that the knowledge about its reproductive biology, general ecology and physiology can be increased. The present work also reinforces the idea that must be a greater interaction between different scientific fields so that a more precise profile of any given organism can be stated. / Atualmente, a realiza??o de levantamentos biol?gicos que sejam capazes de classificar e caracterizar a biodiversidade e suas rela??es ecol?gicas tem sido cada vez mais importante e necess?ria na busca da conserva??o ambiental. A fisiologia da conserva??o preocupa-se em estudar e qualificar diversas vari?veis relacionadas a um organismo, para que assim seja poss?vel ampliar os conhecimentos acerca do funcionamento de determinada esp?cie e detalhar necessidades b?sicas ambientais ou estabelecer per?odos de vulnerabilidade natural. O g?nero Hyalella, de distribui??o americana, tem uma grande import?ncia nas cadeias tr?ficas onde ocorrem, tornando-se uma liga??o fundamental em processos de transfer?ncia energ?tica. O anf?podo Hyalella kaingang, uma esp?cie recentemente descrita e pouco estudada, foi utilizada nas pesquisas referentes ?s an?lises sazonais, e o objetivo do presente trabalho foi analisar o funcionamento metab?lico, a aloca??o energ?tica, os n?veis de lipoperoxida??o e atividades de enzimas antioxidantes da esp?cie. Foram utilizados 30 animais de cada sexo em cada esta??o do ano, os quais foram coletados dentro do Centro de Pesquisa e Conserva??o da Natureza (CPCN) Pr?-Mata, no munic?pio de S?o Francisco de Paula, Rio Grande do Sul.Em campo, os animais foram eutanaziados por crioanestesia e no laborat?rio, homogeneizados para a quantifica??o dos n?veis de prote?nas, glicog?nio, lip?dios, triglicer?deos, glicerol, lipoperoxida??o e a atividade das enzimas super?xido dismutase, catalase e glutationa S-transferase. Houve diferen?a significativa nos n?veis de glicog?nio, lip?dios, triglicer?deos, lipoperoxida??o e na atividade das enzimas super?xido dismutase e glutationa S-transferase ao longo de um ciclo sazonal, tanto em machos como em f?meas.Os resultados encontrados a partir dos biomarcadores de metabolismo energ?tico e do estresse oxidativo indicam tend?ncias alimentares direcionadas ao consumo predominantemente de prote?nas, e tamb?m que o per?odo reprodutivo da esp?cie seja longo, hip?tese baseada tamb?m na observa??o de f?meas ov?geras em muitas esta??es. Sugere-se tamb?m, que exista um pico de atividade reprodutiva no outono. Contudo, mais estudos devem ser realizados com a esp?cie para que possam ser aprofundados os conhecimentos acerca da biologia reprodutiva, ecologia geral e fisiologia desta esp?cie. O presente trabalho refor?a a ideia de que deve haver uma maior integra??o entre diferentes campos cient?ficos para que se possa obter um perfil mais preciso de um determinado organismo.
20

Fatores ambientais e mecanismos comportamentais determinantes da ocorr?ncia de Mysida (Crustacea) no estu?rio da Laguna dos Patos e regi?o costeira adjacente

Gama, Andr?a Mara da Silva 21 August 2008 (has links)
Made available in DSpace on 2015-04-14T13:09:05Z (GMT). No. of bitstreams: 1 404424.pdf: 1163257 bytes, checksum: 6c3545dc1646b5edf5fe6d8fa39fde34 (MD5) Previous issue date: 2008-08-21 / Apesar da sua grande import?ncia, informa??es sobre a biologia e distribui??o dos mis?deos s?o escassas no Brasil. 0 presente estudo foi realizado no estu?rio da laguna dos Patos e regi?o costeira adjacente, utilizando amostras obtidas atrav?s de arrastos de pl?ncton realizados entre os anos de 1994 e 2000. Procurou-se identificar, atrav?s da aplica??o de equa??es log?sticas multivariadas, a influ?ncia relativa de par?metros ambientais diversos na probabilidade de ocorr?ncia das esp?cies de maior abund?ncia. Dentre os par?metros analisados incluiu-se salinidade e temperatura da ?gua, esta??o do ano e turno da amostragem, dire??o do vento e presen?a de fen?menos meteorol?gicos como El Ni?o e La Ni?a. As esp?cies encontradas nas amostras analisadas foram: Neomysis americana, Metamysidopsis elongata atlantica, Mysidopsis tortonesei, Promysis atlantica, Mysidopsis coelhoi, Metamysidopsis munda, Bowmaniella brasiliensis, Promysis orientalis e Siriella sp.. Promysis orientalis, Mysidopsis coelhoi, Bowmaniella brasiliensis e Siriella sp. t?m o seu primeiro registro de ocorr?ncia no interior da laguna dos Patos e regi?o costeira adjacente. De forma geral, considerando os par?metros ambientais analisados, as equac?es log?sticas ajustadas foram muito eficientes em predizer quando as esp?cies n?o estavam presentes no sistema. A margem de acerto de aus?ncia variou entre 89 e 98%. Por outro lado, as margens de acerto quanto ? presen?a foram significativamente menores, oscilando entre 17 e 47%. Tal discrep?ncia de resultados n?o revela inadequa??o do modelo de an?lise, mas sim a variabilidade decorrente do modelo amostral limitado. Neomysis americana foi a esp?cie mais abundante registrada durante o periodo de inverno. A segunda esp?cie mais abundante foi M. e. atlantica, amostrada principalmente na primavera. Metamysidopsis elongata atlantica ? uma esp?cie que ocorre em altas densidades em ?guas rasas de estu?rios das costas Sul e Sudeste do Brasil. Em laborat?rio, respostas comportamentais ? salinidade (10, 20, 25, 28, 30, 40 e 45), temperatura (10, 15, 20, 30+-1?C) e luz (s/n) foram testadas usando machos adultos, f?meas adultas, e juvenis. Embora n?o ocorra resposta a temperatura, as esp?cies mostraram respostas claras a salinidade e a luz. Na presen?a de luz, os organismos permaneceram no fundo do aqu?rio, por?m se moveram para a superf?cie quando as salinidades do fundo aumentaram. Na aus?ncia de luz, os adultos se moveram para a superficie do aqu?rio, mas os juvenis foram ou permaneceram no fundo talvez como maneira de evitar a preda??o dos adultos.

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