Specialized Seed Dispersal in Epiphytic Cacti and Convergence with Mistletoes

Mistletoes represent the best example of specialization in seed dispersal, with a reduced assemblage of dispersal agents. Specific dispersal requirements mediated by the specificity of seed deposition site have apparently led to the evolution of such close relationships between mistletoes and certain frugivores. Here, we provide evidences for another case of specialization involving epiphytic cacti in the genus Rhipsalis, and small Neotropical passerines Euphonia spp., which also act as the main seed dispersers of mistletoes in the family Viscaceae. With field observations, literature search, and observations on captive birds, we demonstrated that Rhipsalis have specific establishment requirements, and euphonias are the most effective dispersers of Rhipsalis seeds in both quantitative and qualitative aspects, potentially depositing seeds onto branches of host plants. We interpret the similar dispersal systems of Rhipsalis and Viscaceae mistletoes, which involve the same dispersal agents, similar fruit morphologies, and fruit chemistry as convergent adaptive strategies that enable seeds of both groups to reach adequate microsites for establishment in host branches. © 2013 by The Association for Tropical Biology and Conservation.

Reduction of infinite dimensional systems to finite dimensions: Compact convergence approach

We consider parameter dependent semilinear evolution problems for which, at the limit value of the parameter, the problem is finite dimensional. We introduce an abstract functional analytic framework that applies to many problems in the existing literature for which the study of asymptotic dynamics can be reduced to finite dimensions via the invariant manifolds technique. Some practical models are considered to show wide applicability of the theory. © 2013 Society for Industrial and Applied Mathematics.

Convergence and Asymmetry in Sanitary and Phytosanitary Measures in the Region's Trade Agreements

Sanitary and phytosanitary matters have acquired greater significance in the region's trade, as reflected in the significant number of complaints brought before the various dispute settlement mechanisms pertaining to the regional integration schemes. This may be attributed to the importance of the Latin American countries in world agricultural trade and to different phytosanitary and zoosanitary standards required by each. Given the multiplication of bilateral and plurilateral agreements in Latin America and the Caribbean, convergence on the sanitary standards required under such accords is crucial for the trade integration of a region that is an agro-exporter par excellence. Convergence is essential to facilitate market access and expedite trade flows. This bulletin assesses convergence of standards in the bilateral and plurilateral trade agreements signed by the countries of the region, the treatment afforded to the principles contained in the World Trade Organization (WTO) Agreement on the Application of Sanitary and Phytosanitary Measures (SPS Agreement) and the progress the region has made relative to that Agreement.

Competition Policy and Trade Agreements in the Region: Exploring Forums for Cooperation and Convergence

The similarities of competition provisions in integration and other intraregional agreements and the dissemination of this information could serve as a basis for progress in cooperation and convergence on this issue in the region. The negotiation processes that have taken place for these agreements have also enhanced communication between the national agencies concerned, leading to processes of learning and harmonization; these processes could be strengthened as part of the current efforts of administrating and implementing trade agreements. This edition of the FAL Bulletin reviews the information available in order to see how progress can be made on this issue on the basis of the analysis and bibliography of Álvarez and others (2006), and Silva and Álvarez (2006).

Convergence and divergence of transport and mobility policies in Latin America: Lack of urban co-modality

This issue of the FAL bulletin analyses transport and mobility policy in Latin America, where the lack of integrated public policies for urban mobility and the failure to take coordinated action over time make it difficult to prioritize investments and coordinate existing initiatives (both public and private).

A new frontier for Caribbean convergence: integration without borders

Today, forty years since its birth, the Caribbean integration has reached its limit.1 2 Consequently, there is urgent need to respond to the current realities and emerging global trends — which require greater engagement from the public, students, academics and policymakers — in moving the Caribbean Community towards a new trajectory of Caribbean convergence. The immediate concern is to devise ways of improving the convergence process among Latin American and Caribbean countries. This convergence process will have to be sensitive to both current and emerging global dynamics. This paper presents the roadmap of a new trajectory towards Caribbean convergence, sensitive to both current and emergent regional and global trends. It begins in Section I by identifying the emerging international political and economic trends that provide a backdrop against which the discussion on Caribbean convergence is squarely placed. Section II discusses the need for a new strategy of convergence, and provides the conceptual framework of Caribbean convergence. Section III spells out the pillars, strategies and delivery mechanisms of Caribbean convergence, and highlights the role of Trinidad and Tobago in this process. The paper concludes by pointing out the urgent need for a regional synergy of economic logic and political logic.

Convergence Property of the Measurement Gross Error Correction in Power System State Estimation, Using Geometrical Background

Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)

A NOTE ON RESOLVENT CONVERGENCE ON A THIN DOMAIN

Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)

Creative Commons: a convergence model between the ideal of commons and the possibilities of creation in contemporary times, opposed to copyright impediments

The contemporary individual finds on the Internet and especially on the Web facilitating conditions to build a basic infrastructure based on the concept of commons. He also finds favorable conditions which allow him to collaborate and share resources for the creation, use, reuse, access and dissemination of information. However, he also faces obstacles such as Copyright (Law 9610/98 in Brazil). An alternative is Creative Commons which not only allows the elaboration, use and dissemination of information under legal conditions but also function as a facilitator for the development of informational commons. This paper deals with this scenario.

Convergence towards asymptotic state in 1-D mappings: a scaling investigation

Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)

Interior-exterior point method with global convergence strategy for solving the reactive optimal power flow problem

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

Supervised variational relevance learning, an analytic geometric feature selection with applications to omic datasets

Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)

Variational and perturbative schemes for a spiked harmonic oscillator

A variational analysis of the spiked harmonic oscillator Hamiltonian operator - d2/dx2 + x2 + l(l + 1)/x2 + λ|x| -α, where α is a real positive parameter, is reported in this work. The formalism makes use of the functional space spanned by the solutions of the Schrödinger equation for the linear harmonic oscillator Hamiltonian supplemented by a Dirichlet boundary condition, and a standard procedure for diagonalizing symmetric matrices. The eigenvalues obtained by increasing the dimension of the basis set provide accurate approximations for the ground state energy of the model system, valid for positive and relatively large values of the coupling parameter λ. Additionally, a large coupling perturbative expansion is carried out and the contributions up to fourth-order to the ground state energy are explicitly evaluated. Numerical results are compared for the special case α = 5/2. © 1989 American Institute of Physics.