Mosca branca: uma ameaça à produção do coqueiro no Brasil.

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First report on the whitefly, Aleurodicus pseudugesii on the coconut palm, Cocos nucifera in Brazil.

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Climate influences the response of community functional traits to local conditions in bromeliad invertebrate communities

Functional traits determine an organism's performance in a given environment and as such determine which organisms will be found where. Species respond to local conditions, but also to larger scale gradients, such as climate. Trait ecology links these responses of species to community composition and species distributions. Yet, we often do not know which environmental gradients are most important in determining community trait composition at either local or biogeographical scales, or their interaction. Here we quantify the relative contribution of local and climatic conditions to the structure and composition of functional traits found within bromeliad invertebrate communities. We conclude that climate explains more variation in invertebrate trait composition within bromeliads than does local conditions. Importantly, climate mediated the response of traits to local conditions; for example, invertebrates with benthic life‐history traits increased with bromeliad water volume only under certain precipitation regimes. Our ability to detect this and other patterns hinged on the compilation of multiple fine‐grained datasets, allowing us to contrast the effect of climate versus local conditions. We suggest that, in addition to sampling communities at local scales, we need to aggregate studies that span large ranges in climate variation in order to fully understand trait filtering at local, regional and global scales

Nitrogen used strategies of nodulated Amazonian legume: Inga edulis

Symbiotic nitrogen fixation in legumes is strongly diminished by mineral nitrogen. Nevertheless, recent work with some tropical legumes revealed low sensitivity to mineral nitrogen or even enhancement of nodulation by ammonium. Thus, in this study, we investigated plant growth and nodulation of Inga edulis over a period of 128 days using different sources of nitrogen, i.e. ammonium (15 mM), nitrate (15 mM) and symbiotic nitrogen fixation. Plant growth was evaluated through dry mass, height, stem diameter and root/shoot ratio as well as nodulation by nodule number and dry mass. Nitrate, ureides and total amino acids were determined in roots, shoots and xylem sap. All three nitrogen sources were found to stimulate growth relative to the noninoculated N-free control, however ammonium was the most effective. Nodulation, both nodule number and mass, was strongly reduced by nitrate but not ammonium. The transport of total amino acids in the xylem sap was stimulated by ammonium without change in the composition with asparagine predominating in all treatments. Inga edulis can benefit from fertilisation with ammonium since even at high concentrations growth was improved without impairing nodulation, a condition appropriate for restoration of soil conditions29119CONSELHO NACIONAL DE DESENVOLVIMENTO CIENTÍFICO E TECNOLÓGICO - CNPQsem informaçã

First report on the whitefly, Aleurodicus pseudugesii on the coconut palm, Cocos nucifera in Brazil.

201

Retrospectiva sociolingüística: contribuições do PEUL Sociolinguistic overview: PEUL's contribution

<abstract language="eng">In this article we focus PEUL's (Programa de Estudos sobre o Uso da Língua) contribution to Brazilian Sociolinguistics, and, specifically, to variationist studies. We start by providing an overview of Rio de Janeiro variable phenomena. Then we show the spread of variation domain and emphasize the systematicity and regularity of a linguistic variable - the formal parallelism - on phenomena of language variation and change, and show some patterns of correlation between language and social structure