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546,196 artículos
Año:
2022
ISSN:
2448-7333, 0188-8897
Figueroa, M. en C. Guadalupe; Muciño Máquez, Rocío Elizabeth; Almanza Encarnación, Saúl
Universidad Autónoma Metropolitana
Resumen
Background. Since 1984, Ortega and several researchers have documented the presence of dinoflagellates in Mexico in reports and inventories to attain an overview of the biodiversity of this and other algal groups. However, their study is still incipient because of the fragility and small cell size of these organisms. Currently, there are more tools for their study, but precisely for this reason, detailed studies are just beginning. Goals. Compilation of an updated list of freshwater dinoflagellates of Mexico up to 2022. Methods. A bibliographic search was carried out by consulting reports and printed and electronic publications available at university documentation centers, as well as by reviewing the specialized databases AlgaeBase and bdLACET. Results. A total of 87 species and infraspecific taxa grouped into 25 genera,18 families and 9 orders have been recorded. The taxonomic classification was based on the system by Moestrup & Calado (2018). The names were updated according to AlgaebBase. Ceratium hiundinella, Gymnodinium palustre, Gymnodinium sp. and Peridinium sp. were the most frequently occurring species. The states of Michoacan, State of Mexico, Mexico City and Oaxaca were the most studied, and the most common environments were lakes, lagoons, and dams. Conclusions. Despite the expected notable increase in reported taxa from 2004 to date, this is likely not a complete list because Mexico presently lacks the personnel and budget for this work, for the expansion of geographic coverage and for the application of electron microscopy and molecular biology techniques necessary for more precise analyses.
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Año:
2022
ISSN:
2448-7333, 0188-8897
Lopez Mejia, Daniela; Siqueiros Beltrones, David Alfaro; Gutiérrez Mendieta, Francisco José
Universidad Autónoma Metropolitana
Resumen
Background: The structure of benthic diatom assemblages (BDA) is related to the type of substrate where they flourish. Goals: assess the degree of variation shown by BDA growing on live and inert substrata from a tropical coastal lagoon (Terminos lagoon). We tested the hypothesis that substrate influence would deem significantly distinct BDA. Methods: diatom samples were collected from live and inert substrata from four sites within Terminos lagoon, México, where physicochemical variables were also measured. Diatom taxa were identified and their relative abundances were estimated and used to compute community parameters (species diversity, equitability, dominance), along with the indicator value (IndVal). Also, similarity between the BDA from the four sites was measured and values were then compared using ANOSIM. Results: Although the IndVal showed a clear separation based on the dominant/constant taxa, ANOSIM indicated that differences between the sites were not significant. This may be related to the characteristic patchy distribution of BDA along environmental gradients. Conclusions: in coastal ecosystems the structure of BDA will be mainly influenced by environmental variables.
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Año:
2022
ISSN:
2448-7333, 0188-8897
Pedroche , Francisco F.
Universidad Autónoma Metropolitana
Resumen
Background. Frederick Michael Liebmann explored Mexico for two years visiting Veracruz, Oaxaca, and Puebla collecting plants, seaweeds, and freshwater algae. These samples were entrusted to J. Agardh in Lund for determination and published in 1847. Goals. Recognize Liebmann and J. Agardh for being the pioneers in the study of Mexican algae and update the taxonomic and nomenclatural status of these names, the first ones in the phyco-inventory of Mexico. Methods. We consulted the integrating works worldwide such as the Index Nominum Algarum (INA) and AlgaeBase whose main task has been to collect scattered and unclear information on the algal names published to date. The original publications and criteria of the International Code of Algae, Fungi and Plants were used, citing the articles or recommendations offered to clarify, resolve, or endorse any taxonomic opinion. Results. Twenty-one species listed by Agardh, for the entire itinerary of Liebmann's expedition, consisting of 196 names, were considered new. Eight additional new species from other collections were described by him. Only twelve of them are names in current use (accepted taxonomically). There are included 27 non-Mexican taxonomic or nomenclatural proposals. Liebman's contributions represent 12% of the total taxa (1698) registered for Mexico. The new species described by J. Agardh are 1% of this total, and eight are part of 23% of the endemisms for the Pacific of Mexico. Conclusions. The origin and taxonomic significance of some of J. Agardh's proposals have remained uncertain after 175 years, so it is necessary to carry out studies that delve into these taxa to arrive at an accurate and updated inventory.
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Año:
2022
ISSN:
1808-3536
Nhacuongue, Januário
Instituto Brasileiro de Informação em Ciência e Tecnologia (Ibict)
Resumen
Awareness of the risks of environmental degradation, ecological collapse and exacerbation of social inequalities still raises questions about the effects of scientific-technological progress and economic rationality. This essay aims to discuss the Anthropocene from the perspective of sustainable development, seeking to locate the elements for its disruption from the role of science. Thus, the following questions become guiding questions: on what levels can the hybridization of knowledge and cultures be articulated in the context of environmental rationality by science? What are the challenges involved in the systematization of traditional knowledge in Information Science? The research uses bibliographic research methods, in a qualitative approach. The theoretical framework is established in terms of social epistemology, based on studies of science, technology and society. The discussion on science and social order showed the need to strengthen awareness of ethics and values of science, for the intertwining of scientific guidelines with the problems of society. It also indicated that the revolution in scientific fields not only provides emerging paradigms from which solutions can be found to overcome the Anthropocene, but also allows for interdisciplinarity. The systematization of traditional knowledge requires its consideration as a set of knowledge, traditions, languages, symbols and rituals, objects, gestures, beliefs, values, etc., dispersed across various manifestations of the experiences of traditional peoples and communities. And critically rethink theories, methods, processes, languages, systems, technologies, etc. for its organization and representation
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Año:
2022
ISSN:
1808-3536
Miller, Tania Correa; Furnival, Ariadne Chloe Mary
Instituto Brasileiro de Informação em Ciência e Tecnologia (Ibict)
Resumen
One of humanity's greatest concerns at the moment is the negative impact produced by environmental change, since its effects have impacts throughout the planet, with different consequences, called by Bruno Latour a “New Climate Regime". The deterioration of the natural environment has been accompanied by a corresponding increase in people’s health problems. We find ourselves in a phase of paradigm crisis in Nutrition Science, in which change becomes increasingly necessary and urgent; the path that has been pointed out is the expansion of existing notions towards a systemic and holistic vision to face the challenges and opportunities of the 21st century. This theoretical reflective essay is based on the work by Bruno Latour and aims to identify the intersections of Nutrition Science and the professional exercise of the nutritionist with the idea of reorientation to the vector that Latour calls “Terrestrial”, as new actor-politician in the Anthropocene period. It is necessary to extend the mandate of evidence-based practice to adopt more relational models of critical thinking for transformational learning in nutrition, providing a collaborative opportunity for all nutrition professionals to support people to combine a healthy diet with sustainable eating. The redirection of Nutrition Science is in line with Latour's recent ideas regarding a possible change from the production system to the generation system in sync with sustainability
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Año:
2022
ISSN:
1808-3536
Prévost, Héloïse
Instituto Brasileiro de Informação em Ciência e Tecnologia (Ibict)
Resumen
The author proposes a reading of agroecological feminist mobilizations in Brazil from the conceptualizations of the « feelingthinking » and the corazonar. The link to the Earth and the fusion between emotions and political analysis are analysed by studying militant supports (mística, songs, poems, slogans) and interviews with rural activists. Understanding this feelingthinking light on the different aspects of violence. An analysis of gender violence, understood as a strategy of agrocapital, is proposed. Socio-environmental domestic violence and "feminicidal agrocapitalists" are part of what the author calls an “agrocapitalist necropolitics”. The collective strategies of surpassing developed by the activists promote an affirmation of the strength and continuity of the struggle and life
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Año:
2022
ISSN:
1808-3536
Léna, Philippe; Issberner, Liz-Rejane
Instituto Brasileiro de Informação em Ciência e Tecnologia (Ibict)
Resumen
In this interview, Philip Fearnside, member of the Brazilian Academy of Sciences, one of the most respected and cited scientists in environmental science in the world, tells us about his long trajectory dedicated to the defence of the environment in general and of the Amazon in particular. He wrote some works that are a reference on the socio-environmental risks of opening roads in certain areas that are coveted for economic purposes. Fearnside is also a reference when it comes to resistance to the construction of dams for energy generation in the Amazon, like Belo Monte. His defence of these ideas has already cost him attacks from representatives of political interests favourable to the economic exploitation of the Amazon. In this interview, he answers about the role of scientists against climate negacionism and misinformation, a theme that Fearnside himself has already addressed in his vast work
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Año:
2022
ISSN:
1808-3536
Santini, Rose Marie; Barros, Carlos Eduardo
Instituto Brasileiro de Informação em Ciência e Tecnologia (Ibict)
Resumen
Efforts to synthesize evidence have been pointing to the advancement of organized forms of disinformation and denial of scientific knowledge about global climate change. In several countries around the world, there is a strong debate about the diffusion of these narratives in the online environment and their political, social and economic impacts. In this work, we carried out a scoping review applied to the Web of Science and Scopus databases, in order to map how the international academic literature has been describing the relationships between science denialism on climate change and the use of disinformation campaigns in the 21st century, as well as as the possible gaps and notes of these studies for the research agenda. In all the media types studied in the 31 selected articles, a predominance of discourses contrary to the scientific consensus on the subject was identified, leveraged by disinformation campaigns organized, including by government actors. We have observed a significant growth in the field in recent years, as well as strategic transformations in denialist communications, tending to a greater dispute of public opinion about science
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Año:
2022
ISSN:
1808-3536
Ferreira, Wheliton Chiang Shung Moreira; Gracioso, Luciana
Instituto Brasileiro de Informação em Ciência e Tecnologia (Ibict)
Resumen
This article was built in the form of a narrative review, with the objective of reflecting on the transfer of technologies in the current times of the Anthropocene, an era in which the actions of the human being reverberate directly in their environments, with indelible impacts that alter the course of the planet's history. The study was structured in two parts. In the first one, it turned to questioning the basic concepts of technology transfer across borders of societies, as well as the resulting change through this new perspective. In the second, more specifically, the theme was illustrated by means of the diverse elucubrations of Yuk Hui, Umberto Eco and Beatriz Sarlo on the human being-doing. As a way of the studies continuation, it is suggested to expand the debate under the “voices” of authors from other diversities
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Año:
2022
ISSN:
1808-3536
Marques, Luiz
Instituto Brasileiro de Informação em Ciência e Tecnologia (Ibict)
Resumen
The Anthropocene concept refers primarily to the increase in scale of human interference in the Earth system, but also to the acceleration of this increase. The combination of these two factors – scale and velocity – shapes the Earth system more decisively than the interference of non-anthropic factors, promoting a collapse of geological time into historical time. Here we highlight two phases of the acceleration of this warming (1970-2015 and 2016-2040), with their most immediate and dramatic consequences: the greater frequency of new heat records and the intensification of extreme heat waves, which have killed more and more people and threaten the habitability of the planet in latitudes of high population density, already on the horizon of the next decades
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