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1. Facilitators to cervical cancer screening in a minority, urban, underserved population

Author

Noel Higgason, Linh Nguyen, Yen-Chi Le, Ogochukwu Juliet Ezeigwe, Tong Han Chung, Natalia Williams, Xochitl K. Olguin, and Abigail S. Zamorano

Subjects
Cervical cancer screening, Health disparities, Social determinants of health, Facilitators to cancer screening, Gynecology and obstetrics, RG1-991, Neoplasms. Tumors. Oncology. Including cancer and carcinogens, RC254-282
Abstract

Objectives: Cervical cancer has markedly declined due to widespread use of screening, but Hispanic women continue to bear a disproportionate amount of the cervical cancer burden due to under-screening. Previous studies have explored barriers to screening but have failed to identify targetable facilitators in this group. We aimed to assess facilitators to cervical cancer screening among a predominantly urban, Hispanic population who presented to a no-cost, community-based clinic. Methods: Patients completed demographic and health information, a validated social determinants of health (SDOH) screen, and a self-reported facilitators survey on factors which enabled them to present to clinic. Descriptive statistics were conducted to assess patients’ sociodemographic characteristics, SDOH, and perceived facilitators. Results: 124 patients were included. 98 % were Hispanic, 90 % identified Spanish as their preferred language, and 94 % had no insurance. Median age was 41. 31 % of patients reported a history of abnormal screening. On SDOH, over 80 % of patients screened positive in at least one domain, with the most common being food insecurity (53 %) and stress (46 %). The most frequently reported facilitator was encouragement from a family member/friend (30 %). 26 % of patients reported time off from work and 25 % reported availability of child/elder care as facilitators. Conclusions: Identifying facilitators among patients who present for cervical cancer screening is critical to designing care plans to reach all populations. Our survey showed that the single greatest facilitator to patients presenting for cervical cancer screening was encouragement from a family member/friend. These findings suggest that increasing community involvement and awareness may help to improve cervical cancer screening in a minority, urban, underserved population.

Published
2024
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2. Spatiotemporal structuring factors in the Chironomidae larvae (Insecta: Diptera) assemblages of an ultraoligotrophic lake from northern Patagonia Andean range: implications for paleolimnological interpretations

Author

Sergio Ribeiro Guevara, Andrea Rizzo, Romina Juncos, Mariano Humberto Donato, Diego Añón Suárez, and Natalia Williams

Subjects
0106 biological sciences, Subfossil, biology, Myriophyllum, PALEOLIMNOLOGY, Ecology, 010604 marine biology & hydrobiology, Otras Ciencias de la Tierra y relacionadas con el Medio Ambiente, SPATIAL PATTERNS, Ablabesmyia, Polypedilum, Aquatic Science, biology.organism_classification, 010603 evolutionary biology, 01 natural sciences, Paleolimnology, Chironomidae, Ciencias de la Tierra y relacionadas con el Medio Ambiente, Macrophyte, Geography, CHIRONOMID DISTRIBUTION, Littoral zone, SEASONAL CHANGES, CIENCIAS NATURALES Y EXACTAS, PATAGONIAN LAKE
Abstract

Chironomid larvae assemblages and their seasonal variations were analyzed in several substrate types from Lake Moreno Oeste (Northern Patagonia) in order to understand the spatiotemporal patterns controlling its community. Information on the factors structuring chironomid communities is important to understand their ecological aspects and to improve the interpretation of paleolimnological records based on the analyses of subfossil assemblages. The chironomid community of Lake Moreno Oeste exhibited spatial heterogeneity, with four distinctive groups of taxa associated with different substrate types: (1) macrophyte Myriophyllum sp. (mainly represented by Parapsectrocladius escondido, Parachironomus sp. and Apedilum griseistriatum); (2) submerged riparian leaves (Ablabesmyia sp.); (3) deep sediment (Cryptochironomus sp. and Polypedilum sp.2.); and (4) littoral and sublittoral sediment (Riethia truncatocaudata and Djalmabatista). Along the sampling period, significant seasonal changes in chironomid composition were observed in substrates from sublittoral and littoral zones; however, a relatively stable community was recorded in the deeper zone. In Lake Moreno Oeste, the spatiotemporal structure of chironomid larvae assemblages is mainly driven by the substrate type and environmental factors associated with depth, such as organic matter content, sediment granulometric composition, and dissolved oxygen. The results presented here contribute to our understanding of chironomid ecology in North Patagonia and constitute an essential step forward to improve biomonitoring and paleolimnological studies in lacustrine environments in the region. Fil: Williams Velázquez, Natalia Noemi. Comisión Nacional de Energía Atómica. Gerencia del Área de Energía Nuclear. Unidad de Actividad de Ingeniería Nuclear. Laboratorio de Análisis por Activación Neutrónica; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Patagonia Norte; Argentina Fil: Añón Suárez, Diego Alejandro. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Patagonia Norte. Instituto de Investigaciones en Biodiversidad y Medioambiente. Universidad Nacional del Comahue. Centro Regional Universidad Bariloche. Instituto de Investigaciones en Biodiversidad y Medioambiente; Argentina. Universidad Nacional del Comahue. Centro Regional Universitario Bariloche. Laboratorio de Fotobiología; Argentina Fil: Juncos, Romina. Comisión Nacional de Energía Atómica. Gerencia del Área de Energía Nuclear. Unidad de Actividad de Ingeniería Nuclear. Laboratorio de Análisis por Activación Neutrónica; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Patagonia Norte; Argentina Fil: Donato, Mariano Humberto. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Instituto de Limnología "Dr. Raúl A. Ringuelet". Universidad Nacional de La Plata. Facultad de Ciencias Naturales y Museo. Instituto de Limnología; Argentina Fil: Guevara, Sergio Ribeiro. Comisión Nacional de Energía Atómica. Gerencia del Área de Energía Nuclear. Unidad de Actividad de Ingeniería Nuclear. Laboratorio de Análisis por Activación Neutrónica; Argentina Fil: Rizzo, Andrea Paula. Comisión Nacional de Energía Atómica. Gerencia del Área de Energía Nuclear. Unidad de Actividad de Ingeniería Nuclear. Laboratorio de Análisis por Activación Neutrónica; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Patagonia Norte; Argentina

Published
2019
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3. Bromine as indicator of source of lacustrine sedimentary organic matter in paleolimnological studies

Author

Natalia Williams, Sergio Ribeiro Guevara, Stefania Villa, Romina Daga, and Andrea Rizzo

Subjects
chemistry.chemical_classification, Sediment, Paleolimnology, Macrophyte, Oceanography, Arts and Humanities (miscellaneous), chemistry, Productivity (ecology), Aquatic plant, Littoral zone, General Earth and Planetary Sciences, Sedimentary organic matter, Organic matter, Geology, Earth-Surface Processes
Abstract

Bromine (Br) to organic matter (OM) concentration ratio is studied in lake sediment sequences to provide information on environmental changes modifying OM production. The sequences studied were extracted from shallow lakes Morenito, El Trébol, Escondido, and Portezuelo; and deep lakes Futalaufquen, Moreno, and Traful (North Patagonia Andean range). Lake Morenito, a former Lake Moreno bay until its closure in AD 1960, showed a decrease in Br:OM ratios from 1.38 to 0.74 after lake closure, associated with an increase of primary autochthonous productivity attributable to the development of submerged and emerging macrophytes. Sedimentary sequences from Lakes Escondido, Portezuelo, and El Trébol (with large participation of macrophytes in primary productivity), and from Lakes Moreno, Futalaufquen, and Traful (with little development of littoral macrophytes), showed Br:OM ratios consistent with the Lake Morenito pattern. Consistently, the morphometric parameters mean depth and shoreline development correlate with Br:OM ratios. Therefore, Br:OM ratios can be associated with the composition of primary autochthonous productivity, with values of about 0.7 associated to significant macrophyte contributions, and higher values associated with more pelagic contributions. Accordingly, Br:OM variations along a sedimentary sequence can be associated with modifications on the composition of the primary autochthonous productivity of the water body, providing information on environmental changes.

Published
2019
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4. Response of Chironomidae to environmental disturbances in a high mountain lake in Patagonia during the last millennium

Author

Sergio Ribeiro Guevara, Andrea Rizzo, Diego Añón Suárez, Maria Rieradevall, Natalia Williams, María Arribére, and Romina Daga

Subjects
010506 paleontology, 010504 meteorology & atmospheric sciences, CHIRONOMIDS, CLIMATE CHANGE, Otras Ciencias de la Tierra y relacionadas con el Medio Ambiente, Climate change, Volcanism, 01 natural sciences, Chironomidae, Paleolimnology, Ciencias de la Tierra y relacionadas con el Medio Ambiente, BIOINDICATORS, Arts and Humanities (miscellaneous), NORTHERN PATAGONIA, 0105 earth and related environmental sciences, Earth-Surface Processes, geography, ARGENTINA, Subfossil, geography.geographical_feature_category, biology, PALEOLIMNOLOGY, TEPHRA LAYERS, biology.organism_classification, Volcano, General Earth and Planetary Sciences, Physical geography, Species richness, Bioindicator, Geology, CIENCIAS NATURALES Y EXACTAS
Abstract

Through the last millennium, Patagonia has been affected by changing climate conditions and successive volcanic eruptions. Lake Tonček is a high-altitude lake in the Southern Volcanic Zone in the northern Patagonian Andes. We documented the responses of the subfossil chironomid community to the effects of successive volcanic and different conditions in a sedimentary sequence from this lake comprising the last 900 years. The community composition and structure (abundance, diversity, and richness) and the development of morphological anomalies in the chironomid mouthparts were evaluated throughout the core. Both climatic conditions and volcanism affected the chironomid community differentially. The chironomid community changed following short-term climate change patterns, being affecting not only by temperature changes but also by variations in the regional precipitation regime. Decreases in abundance and diversity were only observed in coarse volcanic layers. In these samples, we recorded a high percentage of damaged chironomid mouthparts caused by mechanical wear, breakage or abrasion, possibly due to the increase of mineral particles. Our results represent important baseline data about the responses of chironomid communities to environmental disturbances in high-altitude lakes over long time frames. Fil: Williams Velázquez, Natalia Noemi. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Patagonia Norte; Argentina. Comisión Nacional de Energía Atómica. Gerencia del Área de Energía Nuclear. Unidad de Actividad de Ingeniería Nuclear. Laboratorio de Análisis por Activación Neutrónica; Argentina Fil: Añón Suárez, Diego Alejandro. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Patagonia Norte; Argentina. Universidad Nacional del Comahue. Centro Regional Universitario Bariloche. Laboratorio de Fotobiología; Argentina Fil: Rieradevall, Maria. Universidad de Barcelona; España Fil: Rizzo, Andrea Paula. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Patagonia Norte; Argentina. Comisión Nacional de Energía Atómica. Gerencia del Área de Energía Nuclear. Unidad de Actividad de Ingeniería Nuclear. Laboratorio de Análisis por Activación Neutrónica; Argentina Fil: Daga, Romina Betiana. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Patagonia Norte; Argentina. Comisión Nacional de Energía Atómica. Gerencia del Área de Energía Nuclear. Unidad de Actividad de Ingeniería Nuclear. Laboratorio de Análisis por Activación Neutrónica; Argentina Fil: Arribere, Maria Angelica. Comisión Nacional de Energía Atómica. Gerencia del Área de Energía Nuclear. Instituto Balseiro; Argentina. Universidad Nacional de Cuyo; Argentina. Comisión Nacional de Energía Atómica. Gerencia del Área de Energía Nuclear. Unidad de Actividad de Ingeniería Nuclear. Laboratorio de Análisis por Activación Neutrónica; Argentina Fil: Ribeiro Guevara, Sergio. Comisión Nacional de Energía Atómica. Gerencia del Área de Energía Nuclear. Unidad de Actividad de Ingeniería Nuclear. Laboratorio de Análisis por Activación Neutrónica; Argentina

Published
2019

5. Silver bioaccumulation in chironomid larvae as a potential source for upper trophic levels: a study case from northern Patagonia

Author

Diego Añón Suárez, María Arribére, Natalia Williams, Andrea Rizzo, and Sergio Ribeiro Guevara

Subjects
0106 biological sciences, Food Chain, Silver, Health, Toxicology and Mutagenesis, Argentina, 010501 environmental sciences, 01 natural sciences, Chironomidae, Freshwater ecosystem, Ciencias de la Tierra y relacionadas con el Medio Ambiente, Benthos, BENTHIC ORGANISM, Animals, Environmental Chemistry, HEAVY METAL, Ecosystem, 0105 earth and related environmental sciences, Trophic level, LAKE MORENO OESTE, biology, Ecology, Consumer, 010604 marine biology & hydrobiology, Aquatic ecosystem, fungi, Fishes, General Medicine, BIOACCUMULATION, biology.organism_classification, Pollution, NORTH PATAGONIA, Food web, Bivalvia, LACUSTRINE SUBSTRATES, Lakes, Benthic zone, Larva, Environmental science, Seasons, Meteorología y Ciencias Atmosféricas, Water Pollutants, Chemical, CIENCIAS NATURALES Y EXACTAS, Environmental Monitoring
Abstract

Silver (Ag) is a pollutant of high concern in aquatic ecosystems, considered among the most toxic metallic ions. In lacustrine environments, contaminated sediments are a source of Ag for the food web. Chironomidae (Insecta: Diptera) are the most abundant, diverse, and representative insect groups in aquatic ecosystems. Chironomid larvae are closely associated to benthic substrates and link primary producers and secondary consumers. Given their trophic position and their life habits, these larvae can be considered the entry point for the transference of Ag, from the benthic deposit to the higher trophic levels of the food web. Previous studies in lakes from Nahuel Huapi National Park (Northern Patagonia) showed Ag enrichment over background levels (0.04–0.1 μg g−1 dry weight) both in biota (bivalves and fish liver) and sediments from sites near human settlements. The aim of this study was to analyze the role of chironomids in the transference of Ag from the benthic reservoir of Lake Moreno Oeste to the food web. The concentration of Ag in chironomid larvae tissue ranged from 0.1 to 1.5 μg g−1 dry weight, reaching a bioaccumulation factor up to 17 over substrates and depending on the associated substrate type, feeding habitats, larval stage, and season. The main Ag transfer to higher trophic levels by chironomids occurs in the littoral zone, mostly from larvae inhabiting submerged vegetation (Myriophyllum quitense) and sediment from vegetated zones. This study presents novel evidence of the doorway role played by chironomid larvae in Ag pathways from the sediments into food webs of freshwater ecosystems. Fil: Williams Velázquez, Natalia Noemi. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Patagonia Norte; Argentina. Comisión Nacional de Energía Atómica. Gerencia del Área de Energía Nuclear. Unidad de Actividad de Ingeniería Nuclear. Laboratorio de Análisis por Activación Neutróica; Argentina Fil: Rizzo, Andrea Paula. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Patagonia Norte; Argentina. Comisión Nacional de Energía Atómica. Gerencia del Área de Energía Nuclear. Unidad de Actividad de Ingeniería Nuclear. Laboratorio de Análisis por Activación Neutróica; Argentina Fil: Arribere, Maria Angelica. Comisión Nacional de Energía Atómica. Gerencia del Área de Energía Nuclear. Unidad de Actividad de Ingeniería Nuclear. Laboratorio de Análisis por Activación Neutróica; Argentina. Comisión Nacional de Energía Atómica. Gerencia del Área de Energía Nuclear. Instituto Balseiro; Argentina. Universidad Nacional de Cuyo; Argentina Fil: Añón Suárez, Diego Alejandro. Universidad Nacional del Comahue. Centro Regional Universitario Bariloche. Laboratorio de Fotobiología; Argentina Fil: Guevara, Sergio Ribeiro. Comisión Nacional de Energía Atómica. Gerencia del Área de Energía Nuclear. Unidad de Actividad de Ingeniería Nuclear. Laboratorio de Análisis por Activación Neutróica; Argentina

Published
2018
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7. Chironomids as indicators of natural and human impacts in a 700-yr record from the northern Patagonian Andes

Author

Diego Añón Suárez, María Arribére, Natalia Williams, Sergio Ribeiro Guevara, Romina Daga, Andrea Rizzo, and Maria Rieradevall

Subjects
0106 biological sciences, 010504 meteorology & atmospheric sciences, Tanytarsini, CHIRONOMIDAE, Climate change, 01 natural sciences, Paleolimnology, ENVIRONMENTAL IMPACTS, Ciencias de la Tierra y relacionadas con el Medio Ambiente, BIOINDICATORS, Arts and Humanities (miscellaneous), Littoral zone, NORTHERN PATAGONIA, Dicrotendipes, 0105 earth and related environmental sciences, Earth-Surface Processes, biology, Ecology, National park, PALEOLIMNOLOGY, 010604 marine biology & hydrobiology, Polypedilum, biology.organism_classification, Indicator species, General Earth and Planetary Sciences, Meteorología y Ciencias Atmosféricas, Geology, CIENCIAS NATURALES Y EXACTAS
Abstract

Chironomid communities were studied in a sediment core collected from Lake Moreno Oeste, located in Nahuel Huapi National Park. A major change in midge assemblages occurred at ∼AD 1760, which was characterized by a decrease of “cold taxa” including Polypedilum sp.2 and Dicrotendipes, and an increase of “warm taxa” including Apsectrotanypus and Polypedilum sp.1. These taxa are likely related to climatic conditions concurrent with the end of a cold period at ∼AD 1500–1700 and the beginning of a drying climate at ∼AD 1740–1900 in northern Patagonia. Coarse tephra layers had low midge diversity; however they did not disrupt the climatic trend as the community recovered rapidly after the event. Since AD 1910, after the increase in suburban housing, fish introduction, and the construction of a road, there was an increase in the relative abundances of taxa typically associated with the littoral zone, such as Parapsectrocladius, Riethia, Apsectrotanypus, and some Tanytarsini morphotypes. The main change in the chironomid community appears to be associated with long-term climate change. At the beginning of the 20th century, other site-specific environmental factors (catchment change and fish introduction) altered the chironomid assemblages, making it more difficult to understand the relative importance of each driver of assemblage change. Fil: Williams Velázquez, Natalia Noemi. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Patagonia Norte; Argentina. Comisión Nacional de Energía Atómica. Gerencia del Área de Energía Nuclear. Unidad de Actividad de Ingeniería Nuclear. Laboratorio de Análisis por Activación Neutrónica; Argentina Fil: Rieradevall, Maria. Universidad de Barcelona; España Fil: Añón Suárez, Diego Alejandro. Universidad Nacional del Comahue. Centro Regional Universitario Bariloche; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Patagonia Norte. Instituto de Investigaciones en Biodiversidad y Medioambiente. Universidad Nacional del Comahue. Centro Regional Universidad Bariloche. Instituto de Investigaciones en Biodiversidad y Medioambiente; Argentina Fil: Rizzo, Andrea Paula. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Patagonia Norte; Argentina. Comisión Nacional de Energía Atómica. Gerencia del Área de Energía Nuclear. Unidad de Actividad de Ingeniería Nuclear. Laboratorio de Análisis por Activación Neutrónica; Argentina Fil: Daga, Romina Betiana. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Patagonia Norte; Argentina. Comisión Nacional de Energía Atómica. Gerencia del Área de Energía Nuclear. Unidad de Actividad de Ingeniería Nuclear. Laboratorio de Análisis por Activación Neutrónica; Argentina Fil: Ribeiro Guevara, Sergio. Comisión Nacional de Energía Atómica. Gerencia del Área de Energía Nuclear. Unidad de Actividad de Ingeniería Nuclear. Laboratorio de Análisis por Activación Neutrónica; Argentina Fil: Arribere, Maria Angelica. Comisión Nacional de Energía Atómica. Gerencia del Área de Energía Nuclear. Unidad de Actividad de Ingeniería Nuclear. Laboratorio de Análisis por Activación Neutrónica; Argentina. Comisión Nacional de Energía Atómica. Gerencia del Área de Energía Nuclear. Instituto Balseiro; Argentina

Published
2016

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