The Spatial Dimension in Social Media Analysis

In the data revolution era, the availability of “voluntary” and “derived from social media” geographic information allowed the spatial dimension to gain attention in digital and web studies. The purpose of this work is to recognize the impact of this research stream on some methodological and theoretical issues. The first regards “critical algorithm studies” in order to understand what algorithms are used. The second concerns how these works conceive the space. The last two issues concern the disciplinary areas in which these researches take place and which are the ecological units taken into account. The authors answer these questions by analyzing, through a content analysis, the researches extracted with the PRISMA methodology that have used Twitter as a data source. The application of this procedure allows the authors to classify the analysis material, moving simultaneously on the four defined dimensions.

Exploring Topic-language Preferences in Multilingual Swahili Information Retrieval in Tanzania

Habitual switching of languages is a common behaviour among polyglots when searching for information on the Web. Studies in information retrieval (IR) and multilingual information retrieval (MLIR) suggest that part of the reason for such regular switching of languages is the topic of search. Unlike survey-based studies, this study uses query and click-through logs. It exploits the querying and results selection behaviour of Swahili MLIR system users to explore how topic of search (query) is associated with language preferences—topic-language preferences. This article is based on a carefully controlled study using Swahili-speaking Web users in Tanzania who interacted with a guided multilingual search engine. From the statistical analysis of queries and click-through logs, it was revealed that language preferences may be associated with the topics of search. The results also suggest that language preferences are not static; they vary along the course of Web search from query to results selection. In most of the topics, users either had significantly no language preference or preferred to query in Kiswahili and changed their preference to either English or no preference for language when selecting/clicking on the results. The findings of this study might provide researchers with more insights in developing better MLIR systems that support certain types of users and in certain scenarios.

Oceanographic and biogeochemical drivers cause divergent trends in the nitrogen isoscape in a changing Arctic Ocean

Nitrogen stable isotopes (δ15N) are used to study food web and foraging dynamics due to the step-wise enrichment of tissues with increasing trophic level, but they rely on the isoscape baseline that varies markedly in the Arctic due to the interplay between Atlantic- and Pacific-origin waters. Using a hierarchy of simulations with a state-of-the-art ocean-biogeochemical model, we demonstrate that the canonical isotopic gradient of 2–3‰ between the Pacific and Atlantic sectors of the Arctic Ocean has grown to 3–4‰ and will continue to expand under a high emissions climate change scenario by the end of the twenty-first century. δ15N increases in the Pacific-influenced high Arctic due to increased primary production, while Atlantic sector decreases result from the integrated effects of Atlantic inflow and anthropogenic inputs. While these trends will complicate longitudinal food web studies using δ15N, they may aid those focussed on movement as the Arctic isoscape becomes more regionally distinct.

Disentangling food-web environment relationships: a review with guidelines

Food webs represent energy fluxes and nutrient cycling between interacting species, underpinning ecosystem functioning. Whether and how interactions vary over environmental gradients is still largely unknown. We reviewed the literature searching for systematic relationships between structural food-web properties and environmental gradients. Temperature and biotic factors are amongst the most addressed drivers in determining structural food web properties. Most studies are local, replication is often lacking, and regional generalities are difficult to derive. The lack of a consistent theory predicting how food webs change across environmental gradients, the diversity of objectives in food-web studies, and the absence of a standardized methodology for studying them severely limit progress in the field. Moving forward requires the establishment of a core set of testable predictions, agreed standards for data collection and analysis, and the development of geographically distributed experimental studies of food-webs dynamics.

SECONDARY PRODUCTION OF Scolelepis goodbodyi (POLYCHAETA: SPIONIDAE) IN A TROPICAL SANDY BEACH IN THE SOUTHWESTERN ATLANTIC, BRAZIL

The secondary production is the result of the functional response of populations subject to various environmental factors. Marine habitats vary in terms of quantity and quality of food supply, and the use of secondary production values, as well as renewal rates (P/B), may be used as estimates for understanding the incorporation of organic matter and energy per unit, population or community in each area. This estimative was performed for the population of Scolelepis goodbodyi in a tropical beach in the Southwestern Atlantic, located in an upwelling area. A comparison of Spionidae and non-spionid populations from different latitudes was also done. The Mass Specific Growth Rate method (MSGR) and the Production/Biomass ratio (P/B) were used to estimate the somatic annual production and average annual biomass. The mean density and biomass were 16.38 ind. m-2 and 2.78 g AFDW m-2,respectively. The secondary production and P/B were 8.3 g AFDW m-2 y-1 and 2.98 y1, respectively. The growth rate in weight was greater for the small size than the large size classes. The largest individuals (W3C = 1.0 mm) showed the lowest biomass and secondary production values. The observed high rates of secondary production and P/B suggest that this S. goodbodyi population can transfer large amounts of biomass to higher trophic levels of the local food web. Studies of the secondary production of spionidae populations in different latitudes, including the population of S. goodbodyi in the beach of Manguinhos, showed variability in their rates probably due to the differences of several factors such as life history and environmental variability

Tracking Websites’ Digital Communication Strategies in Latin American Hospitals During the COVID-19 Pandemic

Since the advent of the Internet, websites have become the nerve center of the digital ecosystems of media, companies and all kinds of institutions. Currently, the impact of the global coronavirus pandemic has placed healthcare issues at the center of social debate, including hospitals and their websites as digital sources of trustworthy information. COVID-19 has intensified the need for quality information and the legitimacy of sources fighting the infodemic situation. In this regard hospitals become essential social actors in the spread of healthcare information. Within this framework, a qualitative study is presented with descriptive components and based on content analysis. This study examines 58 websites from the best hospitals included in the “América Economía” ranking health sector from Latin America. The study applies an analysis methodology based on previous research focusing on specialized web studies, defining an analysis model on six variables and 65 thematic indicators. The research concludes that hospitals occupying first positions in the medical services directory are not necessarily those that have the best websites. Similarly, it is worth noting that a quarter of the studied sample do not devote a specific space to reporting coronavirus information. Brazil, Colombia and Chile are the countries with the highest number of hospitals among those with the best websites. In conclusion, digital media, specifically websites, could constitute legitime resources of healthcare information consumption, so their accuracy and proper development seem to be significant to become genuine sources that not only could provide better healthcare services but help avoid the spread of misinformation about the COVID-19 pandemic.

Freshwater research in Latin America: Current research topics, challenges, and opportunities

Introduction: Freshwater research in Latin America has been increasing in recent years, with a large participation of scientists based on local institutions. However, researchers in the region are facing diverse challenges, and we lack a regional overview of the status of freshwater research. Objective: To address this, we surveyed researchers in the region to assess the current activity and challenges faced by the scientific community. We were interested in understanding (1) the type of research currently taking place in the region, (2) the major research gaps, as viewed by local researchers, and (3) the main limitations or obstacles slowing the development of freshwater science in the region. Methods: We prepared a questionnaire with 26 questions regarding the background of participants, their ongoing research priorities, the products generated from their research, and the major limitations they are facing as researchers. Results: We obtained 105 answers from researchers in 19 Latin American countries. Some of the important trends identified included: (1) a focus on stream ecosystems under agricultural and natural forest; (2) emphasis on biodiversity assessment and species inventories; (3) limited ecological research, mostly centered on litter decomposition and food web studies; and (4) communicating research in the form of peer-reviewed papers and reports in gray literature. Major limitations to the scientific activity included: (1) language, with a majority of respondents considering their handling of English a handicap; (2) limited access to research equipment; (3) lack of tools, such as taxonomic keys; and (4) limited research funding. Research needs and priorities resulted in three major areas in need of attention: (1) developing taxonomy and systematics; (2) improving our current understanding of ecology and natural history; and (3) understanding species distributions and biodiversity patterns. Conclusions: Latin America has an active community of scientists. There is a need to diversify research topics, without abandoning traditional research areas (e.g., taxonomy, species distribution). We advocate for more collaboration among scientists with similar research goals, regardless of their affiliation. Improving communication and collaboration among universities and countries within Latin America will certainly facilitate overcoming obstacles and will help shaping a brighter future for freshwater research, and sciences in general, in the region.