Increasing public interest in science information in a digital and 2.0 science era promotes a dramatically, rapid and deep change in science itself. The emergence and expansion of new technologies and internet-based tools is leading to new means to improve scientific methodology and communication, assessment, promotion and certification. It allows methods of acquisition, manipulation and storage, generating vast quantities of data that can further facilitate the research process. It also improves access to scientific results through information sharing and discussion. Content previously restricted only to specialists is now available to a wider audience. This context requires new management systems to make scientific knowledge more accessible and useable, including new measures to evaluate the reach of scientific information. The new science and research quality measures are strongly related to the new online technologies and services based in social media. Tools such as blogs, social bookmarks and online reference managers, Twitter and others offer alternative, transparent and more comprehensive information about the active interest, usage and reach of scientific publications. Another of these new filters is the Research Blogging platform, which was created in 2007 and now has over 1,230 active blogs, with over 26,960 entries posted about peer-reviewed research on subjects ranging from Anthropology to Zoology. This study takes a closer look at RB, in order to get insights into its contribution to the rapidly changing landscape of scientific communication.
The purpose of this research was to assess the effects of dredging performed in a marginal wetland colonized by aquatic macrophytes on eutrophication of the adjacent shallow tropical lake (Imboassica Lake, Brazil). The river mouth of the Imboassica River that drains into Imboassica Lake had been densely colonized by aquatic vegetation dominated by Typha domingensis (Pers.) when it was dredged. Total and dissolved nitrogen and phosphorus concentrations were measured monthly over 13 years at four stations in the Imboassica river-lake system. Dredging activities reduced phosphorus and nitrogen retention at the river mouth and subsequently increased these nutrient stocks in the lake waters. Nutrient retention by non-dredged wetland was estimated to be ca. ) for phosphorus. Our whole-lake approach suggested that dredging might intensify rather than mitigate eutrophication in shallow tropical lakes when the removal of aquatic macrophytes is coupled to the persistence of anthropogenic nutrient inputs from the watershed.
resuMOo ciclo do fósforo é um dos ciclos biogeoquímicos que mais sofreu alterações nas últimas décadas devido a forte ação antrópica, sendo os efluentes domésticos os principais responsáveis neste processo. A discussão do papel das macrófitas emersas como mediadoras de um transporte líquido de fósforo do sedimento para a coluna d'água ('Bomba de fósforo') ou como um sumidouro deste elemento torna-se relevante para o entendimento do ciclo fósforo em ecossistemas aquáticos. O objetivo principal desta revisão é discutir os principais mecanismos responsáveis pela transferência de fósforo em macrófitas emersas e suas conseqüências para o ciclo do fósforo em lagos rasos. Palavras-chave: Macrófitas aquáticas emersas, fósforo, lagos rasos. ABSTRACTthe rOle Of eMergent aquatic MacrOPhytes in the PhOsPhOrus cycle Of shallOw lakes. the phosphorus cycle is one of the biogeochemical cycles that has been more altered in the last decades due to strong antropic activity, being domestic sewage the main responsible in this process. the discussion of the emergent macrophytes role as mediators of a net transport of phosphorus from sediment to the water column ('Phosphorus pump') or as net sinks of phosphorus becomes relevant for the phosphorus cycle understanding in aquatic ecosystems. the aim of this review is to discuss the main responsible mechanisms for phosphorus transference in emergent macrophytes and its consequences to the phosphorus cycle in shallow lakes. keywords: Emergent aquatic macrophytes, phosphorus, shallow lakes. cOnsiderações iniciaisos lagos constituem ecossistemas bem distribuídos na superfície terrestre (Downing et al. 2006), sendo reconhecidos como importantes ambientes de acumulação de matéria orgânica e inorgânica, devido a sua freqüente posição terminal na bacia de drenagem (Lennon 2004). A matéria inorgânica que limita a atividade biológica possui a denominação genérica de nutriente. Dessa forma, o escoamento superficial e subsuperficial, que resulta em um enriquecimento de nutrientes (eutrofização) nos lagos, é considerado pela literatura clássica um processo natural que influencia intensamente a biota e a própria sucessão ecológica (Lindeman 1942). no entanto, as atividades humanas também podem contribuir fortemente para a eutrofização dos lagos, trazendo resultados mais drásticos e em menor escala de tempo.
ResumoÉ crescente no Brasil a preocupação com Educação em Ciência e são inúmeras as iniciativas que utilizam tecnologias educacionais nesse contexto. Entretanto, muito ainda se discute sobre as melhores formas de usar essas tecnologias na educação em ciência. Diante disso, apresentamos uma introdução sobre alguns termos relacionados à educação em ciência e um pouco sobre a importância e a necessidade da formação da consciência científica para o exercício pleno da cidadania. Seguimos definindo o que são as "novas" tecnologias e finalizamos exemplificando formas de uso desta tecnologia para a educação em ciência. Palavras-chave:Educação em ciência, alfabetização científica, divulgação científica, novas tecnologias. AbstrAct The concern in Brazil with
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