Los Alamos National Laboratory Research Articles

Species richness and ecological connectivity of the mammal communities in urban and peri-urban areas at Mexico City

AbstractUrban expansion has emerged as a pervasive driver of biodiversity loss in Mexican cities due to shifts in landscape composition and configuration. Hence, the preservation of forest cover, green spaces and isolated trees assume a critical role in conserving the biodiversity within urban areas. We compared mammal assemblages across 520 sites in Mexico City examining the impact of local vegetation and site characteristics (e.g., patch size, isolation distance) on diversity patterns. Then, we used a generalized linear model to evaluate the relationship between mammal assemblages (including both alpha and beta diversities) and the level of structural and functional connectivity across the landscape. We collected 5,063 records of 38 species from the sampled sites. Mammalian richness ranged from 1 to 9 spp./site, and the mean of taxonomic and functional (Functional Distance [MFD]) alpha diversities were 1.9 ± 1.3 spp./site and 0.41 ± 0.60 MFD/site, respectively. The average size of habitat fragments was 0.41 hectares, and the percent forest cover per site ranged from 0.5 to 100%. Both species and functional alpha diversities were different among the land-use and vegetation types (including protected vs. non-protected areas). There was a clear distinction (β value > 0.40) in species composition across the landscape, which was positively related to geographical distance and negatively related to connectivity between sites. We identified four main patches especially important to connectivity across the city and argue that conserving them is critical for restoring key components of biodiversity and ecosystem services in urban and peri-urban areas of Mexico City.

Project Connect 2024: Building Community Across the Spectrum – Fostering Community Strength and Connectivity

Project Connect 2024: Building Community Across the Spectrum – Fostering Community Strength and Connectivity

E-local Mart Website Using Web Development

Abstract: Digital technology has revolutionized the way we shop, making it easier and more convenient. In line with this, we propose the development of "E-Local Mart," a new website designed for fruits, vegetables and many other products vendors and customers. This platform will serve as a digital marketplace where vendors can list their products in real-time, allowing customers to easily see what's available and where vendors are located. The goal is to bridge the gap between vendors and customers, making transactions more efficient and fostering a stronger community connection. Through E-Local Mart, vendors can effectively manage their inventory and reach a wider customer base, while customers gain access to a diverse range of fresh produce and the convenience of locating vendors on a map. This project aims to modernize traditional marketplaces and enhance accessibility for both vendors and customers

Unique Profiles of Postpartum Family Needs and Evidence of Racial and Ethnic Disparities: Insights from Community Implementation of Family Connects.

To delineate specific family needs during the postpartum period using data from Family Connects (FC), a universal home-visiting initiative, and to scrutinize potential racial and ethnic disparities in these needs. FC implementation data spanned from July 1, 2009, to August 31, 2021, in seven counties across the USA. Data encompassed nurse-led in-home assessments for 34,119 families. Nurses evaluated needs across four domains (healthcare, parenting/childcare, safe home, and parent support) comprising 12 risk factors. Overall, families reported high levels of need, and community connections were facilitated for 57% of visited families. Significant differences in need profiles between whites and minority groups were revealed, reflecting both disparity and uniqueness. Employing the Oaxaca decomposition approach, we found that racial/ethnic disparities in socioeconomic attributes were associated with racial/ethnic gaps in the need profiles. The event of giving birth is both high risk and high opportunity for preventive intervention. Home-visiting programs, as an evidence-based approach, must address the diverse spectrum of familial needs comprehensively.

Aquatic Bacterial Community Connectivity: The Effect of Hydrological Flow on Community Diversity and Composition

Microbial communities are vital components of freshwater ecosystems due to their role in nutrient cycling and energy flow; however, the mechanisms driving their variation are still being explored. In aquatic systems, water flow (hydrology) can impact microbial community composition through community connectivity; however, the details of hydrology’s effects on microbial connectivity remain unclear. To address this question, we used 16S rRNA metabarcoding to determine bacterial community composition and connectivity across flow transects in three connected Great Lakes waterbodies with very different water-flow regimes: the Little River (high flow), the Detroit River (moderate flow), and Lake Erie (low flow). Bacterial alpha diversity (Chao1) did not differ among the three locations or sample sites along the transects. Analyses of beta diversity using community dissimilarity matrices identified significant differences among the three locations and among sample sites within locations. Bacterial community connectivity varied among the three locations, with a significant distance–decay relationship observed only in the low-flow location, which is indicative of connectivity driven by spatial proximity. Directional analyses showed that the water-flow direction affected bacterial similarity, consistent with the expected hydrological effects on community connectivity and previous published work. Our results indicate that (1) microbial community composition varies within and among even geographically close sampling locations and (2) the specific water-flow regime appears to affect bacterial community connectivity. Including hydrology in models of bacterial community composition will improve our understanding of the relative roles of selection versus stochastic effects on bacterial community diversity and composition in freshwater ecosystems.

THE STUDY OF THE SELF-ATTITUDE OF DISPLACED PEOPLE IN THE CONDITIONS OF ADAPTATION TO THE NEW SOCIAL ENVIRONMENT

The work focuses on the characteristics of a person's self-attitude in the context of social-psychological displacement problems. This study examines how displacement can lead to changes in a person's characteristics and the specific socio-psychological challenges they face in their new living environment. The research focuses on understanding how self-attitude is expressed during socio-psychological adaptation among displaced individuals. The findings reveal that individuals who experience displacement in a new social environment tend to exhibit low self-confidence, self-management, self-evaluation, self-acceptance, and self-analysis. As a result, they often face internal conflicts and engage in self-criticism. This suggests that during the initial months of displacement, individuals develop a negative self-attitude, with positive aspects of self-attitude diminishing. However, the second stage indicates that positive changes in self-attitude are crucial for the survival and well-being of the individual and their family. Displacement and the challenges of adapting to a new socio-cultural environment are driven by the need for self-reassessment and self-acceptance. Moving from self-criticism and internal conflict towards self-esteem and self-acceptance serves an adaptive function, allowing individuals to better adjust to their new life conditions. Moreover, the study underscores the profound impact of social support networks in facilitating the transition towards a more positive self-attitude among displaced individuals. Strong social ties and community connections are crucial in bolstering self-esteem and fostering a sense of belonging, which are paramount for navigating the challenges of displacement. Recognizing and leveraging these support systems can significantly contribute to displaced individuals' psychological resilience and adaptive capabilities, ultimately enhancing their overall well-being and successful integration into their new environment.

Does the harvest of the natural populations of the floating seaweed Durvillaea incurvata (Surh) Macaya affect its dispersal potential?

Dispersal of floating seaweeds contributes to the connectivity of marine communities. Little is known about the harvest of natural populations by fishermen on the dispersal capacity of these species. Harvesting decreases the available biomass and the size of individuals. Therefore, it can be hypothesized that the availability of floating specimens will be lower at sites with the highest harvesting intensity compared to sites with low intensity harvesting. Using the floating seaweed Durvillaea incurvata as a model, the relationship between the harvest of its benthic populations and the strandings on adjacent beaches was examined. Surveys were carried out during summer and winter from 2021 to 2023 at sites along the coast of Chile (33°S - 42°S) with different management administrative strategies and seaweed harvesting intensity: (a) Marine Protected Areas (MPA, low level), (b) Territorial Use Rights for Fisheries (TURF, intermediate level), and (c) Open Access Areas (OAA, high level). Measurements of biomasses, size structure, reproductive stage, potential buoyancy and floating times (using attached Lepas spp. as proxy) of the specimens from benthic populations and strandings on adjacent beaches were made. Benthic biomasses and sizes of D. incurvata specimens were higher in MPA compared to TURF and OAA, which were consistent with strandings on nearby beaches. Benthic and stranded biomasses, densities, lengths and percentages of reproductive individuals were higher in winter compared to summer. The presence and sizes of Lepas spp. indicated short floating times of stranded individuals. Significant relationships between biomasses, densities, and lengths of benthic and stranded D. incurvata specimens were observed, according to harvest intensity levels and seasons. Our results suggest that the harvest of benthic populations can affect the dispersal potential of D. incurvata. Exploitation of natural populations of floating seaweeds should consider their dispersal capacity, which may be useful for the recovery of over-exploited areas.

Benford’s law in atomic spectra and opacity databases

The intriguing law of anomalous numbers, also named Benford’s law, states that the significant digits of data follow a logarithmic distribution favoring the smallest values. In this work, we test the compliance with this law of the atomic databases developed at the National Institute of Standards and Technology (NIST) focusing on line energies, oscillator strengths, Einstein coefficients and radiative opacities. The considered databases are the Atomic Spectra Database (ASD) and the NIST-LANL (Los Alamos National Laboratory) Lanthanide/Actinide Opacity Database. The present study is not limited to the first digit and the case of multipole lines is also considered. The fact that the law is verified with a high accuracy means that the occurrence of digits reflects the constraints induced, in a given angular-momentum coupling, by the selection rules for atomic processes. As a consequence, Benford’s law may be of great interest to detect inconsistencies in atomic databases.

Uranium measurements in the field using high-resolution cadmium zinc telluride detectors

A new generation of cadmium zinc telluride (CZT) detectors has become available and is being evaluated by the International Atomic Energy Agency (IAEA) for safeguards verifications in the field. The new CZT detector, model M400, is a room temperature spectrometer manufactured by H3D, Inc. The M400 demonstrates superior energy resolution, effective isotope identification capabilities, and convenient usability features when tested in a controlled laboratory environment. These characteristics define the M400 as a potential platform for IAEA field detection applications, which could become suitable for nuclear material characterization (e.g., enrichment verification) and nuclear safeguards missions. The capabilities of gamma spectrometry codes including Fixed energy, Response function Analysis with Multiple efficiencies (FRAM) from Los Alamos National Laboratory, CZT for Uranium (CZTU) from Lawrence Livermore National Laboratory, and Gamma Detector Response and Analysis Software (GADRAS) from Sandia National Laboratories were adapted for M400 spectra, and the performance of the codes has been validated. This was reported in a prior work. To further validate the performance of the high-energy resolution CZT detector and the isotopic analysis codes, a field measurement campaign consisting of uranium hexafluoride (UF6) cylinder measurements was conducted at a fuel fabrication facility. A total of 34 Type 30B cylinders containing UF6 were measured using three different M400 CZT detectors. Each detector was outfitted with a custom rectangular collimator and shield made out T-Flex®, a tungsten-impregnated polymer. Measurements were performed at three different locations of the cylinder, ensuring that the measurement geometry satisfied the infinite thickness criterion. The spectra from the M400 CZT were analyzed using the code General Enrichment Meter (GEM). For analyzing the gamma-ray spectra from UF6 cylinder, the GEM code is the appropriate tool since it relies only on the gamma-ray emissions from 235U and not from other isotopes. Results from the spectral analysis were compared with the known abundance of 235U in the cylinders, as well as with the International Target Values 2020 (ITV2020). The suitability of the different underlying techniques used by the various codes for UF6 analysis is discussed. The challenges of measuring UF6 contained in cylinders and mitigation strategies are highlighted.

Exploring microbiome and plankton responses and interactions in the mangrove ecosystem through eDNA and network analysis

The comprehensive analysis of multiple biological communities is essential for assessing diversities within mangrove ecosystems, yet such studies are infrequent. Environmental DNA (eDNA) facilitates the simultaneous exploration of organisms across various levels within a single ecosystem. In this investigation, 16S rRNA, cytochrome C oxidase I (COI), and Mito-fish primers were employed to characterize the microbiome, eukaryotic plankton, and fish communities, along with their intricate interactions, across 24 samples from three Chinese mangrove reservoirs. The resulting dataset encompasses 3779 taxonomic groups (genus level), spanning from the microbiome to vertebrates. Diversity analysis unveiled a higher level of stability in the microbiome community compared to plankton, underscoring the superior site-specificity of plankton. The association analysis revealed that biodiversity was primarily affected by temperature, turbidity, and fluorescent dissolved organic matter (fDOM). Notably, the physicochemical factors, turbidity, and fDOM had a more pronounced impact on the microbiome than on plankton, explaining their distinct sensitivities to site-specific conditions. Network analysis constructed 15 biological interaction subnetworks representing various community connections. The most connected genera in each subnetwork, highly responsive to different environmental factors, could serve as potential indicators of distinct ecosystem states. In summary, our findings represent the first comparison of the response sensitivities of different communities and the construction of their interaction networks in mangrove environments. These results contribute valuable insights into marine ecosystem dynamics and the role of environmental factors in shaping biodiversity.

Diversity and potential host-interactions of viruses inhabiting deep-sea seamount sediments

Seamounts are globally distributed across the oceans and form one of the major oceanic biomes. Here, we utilized combined analyses of bulk metagenome and virome to study viral communities in seamount sediments in the western Pacific Ocean. Phylogenetic analyses and the protein-sharing network demonstrate extensive diversity and previously unknown viral clades. Inference of virus-host linkages uncovers extensive interactions between viruses and dominant prokaryote lineages, and suggests that viruses play significant roles in carbon, sulfur, and nitrogen cycling by compensating or augmenting host metabolisms. Moreover, temperate viruses are predicted to be prevalent in seamount sediments, which tend to carry auxiliary metabolic genes for host survivability. Intriguingly, the geographical features of seamounts likely compromise the connectivity of viral communities and thus contribute to the high divergence of viral genetic spaces and populations across seamounts. Altogether, these findings provides knowledge essential for understanding the biogeography and ecological roles of viruses in globally widespread seamounts.

“Stay tuned!"

“Stay tuned!"

Managing the Needs of Orphans and Vulnerable Children in Mainstream Rural Schools: An Ethnopsychology Informed Approach

Orphans and vulnerable children (OVC) in mainstream rural schools encounter unique challenges stemming from loss, economic instability, and disrupted familial structures. Addressing their needs demands a comprehensive and culturally sensitive approach. This paper thus explored the use of an ethnopsychology framework to understand and address the diverse needs of rural children, emphasizing the importance of culturally sensitive interventions in mainstream schools. It also evaluated the effectiveness of ethnopsychological interventions and the role of community collaboration. This article used secondary data sources to understand how the ethnopsychology approach can be utilized as a potential sustainable intervention strategy for the needs of OVC in mainstream rural schools. The results show that OVC are well-served by the cultural resources that rural schools have in abundance from a cultural perspective. The study also emphasized the significance of cultural practices and beliefs in influencing community responses and developing resilience in assisting OVC. The study supported the care, protection, and psychosocial support to OVC as significantly influenced by family and relationship networks, community-based organizations, and traditional support systems. The paper made recommendations for improving rural schools’ response to OVC needs in light of cultural sensitivity. These include boosting collaboration between formal and informal support systems, creating community networks, fostering cultural adaptation and preservation, and giving community members more agency through programs that increase their knowledge and skills. This study underscored the significance of ethnopsychology principles of community and social connection in leveraging cultural resources, context-based and responsive interventions, and appreciating and sustaining existing indigenous knowledge systems in understanding and addressing the needs of OVC in mainstream rural schools. Understanding and supporting OVC contributes towards cultivating meaningful collaborations and transformative care of OVC in the Global South. Keywords: Ethnopsychology, Cultural Sensitivity, Rural Community, Mainstream Rural Schools, Orphans and Vulnerable Children.

Research on User Expectations for Future Community Coworking Spaces

Driven by the rapid advancement of Intelligent technology, work practices and scenarios have undergone structural transformations, making community coworking a new urban office model. This study conducted an exploratory future research experiment using the 'setting the stage' method to uncover users' future expectations. The findings revealed dimensions of future expectations for community coworking spaces across overall, office, and non-office areas. It summarized design strategies for creating a smart ecological community coworking landscape, building a flexible shared office-life complex, and fostering interpersonal and community connections, offering references for designing future community workplaces.

Study of an evaluation method of earthquake-proof capacity of a community during an earthquake

In dealing with the occurrence of earthquakes, urban communities and people within the system should primarily consider the geological background, secondary hazards caused by earthquakes, countermeasures to mitigate earthquake disasters, community connectivity, and the impact of various indicators and criteria on the earthquake-proof capacity of the community. It is important to comprehensively assess these factors to ensure that a community is well-prepared to withstand an earthquake. This study takes Shenzhen (China) as an example to conduct a preliminarily evaluation of a method of earthquake-proof capacity during an earthquake, with the results reflecting the comprehensive capacity of communities. The evaluation framework focuses more on effectively improving the disaster response capacity and resilience of urban communities.

Promoting children’s health through community-led street interventions: analyzing sustained voluntarism in Canadian School Streets

BackgroundActive School Travel (AST) initiatives align with the Ottawa Charter for Health Promotion, which calls for ‘creating supportive environments’ and ‘strengthening community action.’ However, their reliance on volunteers poses sustainability challenges. The main objectives of this study were to document the motivations, satisfaction, and experiences of volunteers involved in sustaining two AST initiatives in Ontario for an entire school year.MethodsTwo volunteer-led School Street initiatives in Kingston, Ontario successfully operated during pick-up and drop-off times of each school day. The first initiative operated for the entire 2021-2022 school year, and the second operated for the entire 2022-2023 school year. These initiatives were the first of their kind in the province of Ontario, Canada. Volunteers from both sites (n = 56) participated in online surveys and their motivations, satisfaction, and experiences of their role were compared using the 2-sided Fisher’s Exact Test.ResultsOver 80% of volunteers were highly motivated to promote safety and over 70% of volunteers were highly motivated to disrupt the status quo of unsupportive, car-centric urban environments by reimagining how streets can be used. By taking collective action to re-shape the environment around these public schools to support healthy, active living, our findings reveal that over 90% of volunteers were highly satisfied. Of the volunteers, 87% felt they contributed to child safety and 85% felt they had developed stronger community connections. They appreciated the short (i.e., 40 minute) time commitment of each shift, weekly email communications by the community organization leading the initiative, and the volunteer schedule. They also appreciated the positive social interactions during volunteer shifts, which they felt outweighed the minimal resistance they experienced.ConclusionsThis research demonstrates the importance of logistical, motivational, and social factors in recruiting and retaining volunteers for community-led School Streets. Our findings support appealing to prospective volunteers’ influence in achieving School Street objectives (e.g., improved safety) in recruitment efforts, as well as highlighting School Streets’ innovative approach. Communicating with volunteers throughout School Street planning and implementation processes and limiting traffic in the closed street zone (i.e., by excluding the school staff parking lot and private driveways from the scope) are additional recommendations based on the findings of this study.

The ‘right’ place to age? Exploring age-friendly and diversity-sensitive design in a super-diverse neighbourhood

The neighbourhood is a significant place for older adults in later life, especially given their strong wish to age in place, pointing to the importance of age-friendly design that accommodates older adults’ changing needs. Moreover, the older population is diversifying, highlighting the additional need for diversity-sensitive design, accommodating older adults’ diverse needs. Considering the importance of public places to age-friendly and diversity-sensitive design, this paper explores design that promotes community connection in an age-friendly and diversity-sensitive manner. To do so, a research-by-design study with master students in (interior) architecture was set up in a super-diverse Belgian neighbourhood. After a pre-design phase that immersed students in the neighbourhood and its inhabitants’ experiences, the students engaged in a design phase. Here, they re-designed various public places in an age-friendly and diversity-sensitive manner. The design output illustrates how various functions and intensities answer the changing and diverse needs of a super-diverse population.

Intergenerational differences in the environmental concerns of plastic waste business owners: environmental knowledge, environmental risk exposure, and community connection as mediators

Promoting environmental concern among plastic waste entrepreneurs is a crucial step towards addressing the issue of plastic pollution effectively. To comprehend the techniques for enhancing environmental responsibility within this demographic, it is essential to examine the intergenerational shifts in environmental attitudes, which can provide valuable insights. This study investigates the intergenerational differences in two types of environmental concerns (i.e., ecological worldview and local environmental issue concern) by taking two generations of plastic waste business owners in Wuzhen Town, China, as a case. The roles of post-materialistic values, environmental knowledge, environmental risk exposure via new media, and community connection in mediating the relationships between generation and environmental concern were also examined in light of the Mindsponge theory. A paired-sample survey (N = 102) was utilized to collect data. The results of path analyses showed significant intergenerational differences in ecological worldview but insignificant intergenerational differences in local environmental issue concerns. While nondaily environmental knowledge and environmental risk exposure via new media significantly and positively mediated the relationship between generation and ecological worldview, community connection significantly and negatively mediated the relationship between generation and local environmental issue concern. Although a significant difference was found in the post-materialistic values between the two generations of plastic waste business owners, this variable did not significantly predict environmental concern.

Quantum mechanical study of transition metal hydrides: Comparison of determined molecular properties with experimental data.

This study compares results of four relativistic pseudopotential basis sets, which differ mainly by their size: double-zeta introduced by Hay and Wadt from Los Alamos National Laboratory (LANL2DZ), triple-zeta based on Stuttgart energy-consistent scalar-relativistic pseudopotential (SDD3), its extension with 2fg polarization functions, and combination of Stuttgart pseudopotentials with quintuple-zeta cc-pV5Z base (SDD5). Hydrides of transition metals from Cr to Zn group are chosen as reference molecules. The coupled cluster method (CCSD(T)) is used for evaluation of selected molecular characteristics. Interatomic distances, dissociation energies, vibration modes, and anharmonicity constants are determined and compared with available experimental data. As expected, the accuracy of basis depends mainly on its size. However, only moderate modification of SDD3 basis set significantly improves its accuracy, which becomes comparable to the largest basis set. Nevertheless, the time consumption is significantly lower.

Estimating Kappa within a Low-Seismicity Region in Northern New Mexico Using Data Recorded by the Los Alamos Seismic Network

ABSTRACT We quantify the total attenuation, κ, and the attenuation component due to near-surface site effects, κ0, in a region in northern New Mexico using data recorded by the Los Alamos Seismic Network. The area is characterized by low seismicity, where most of the well-recorded earthquakes have magnitudes between 1 and 2. This magnitude range poses a challenge for commonly used kappa methods because the high-frequency attenuation cannot be confidently isolated from the bandwidth in which the corner frequency roll-off occurs. We determine through synthetic experiments that estimates of κ within this range have quantifiable biases that depend on source (corner frequency), site (κ magnitude), and data quality characteristics (fitting bandwidth), which can be used to correct estimated κ from three commonly used kappa methods. Using 412 recorded earthquakes, we show that a bias correction results in κ distributions and κ0 estimates that are more consistent between the three methods, suggesting that the bias correction results in κ values with higher fidelity. Using the bias-corrected κ, we find κ0 between 0.038 and 0.049 s within the Valles Caldera and between 0.026 and 0.066 s on Los Alamos National Laboratory property, values near those commonly used in the western United States. We find that a main limitation in the quality of κ0 is the small number of usable waveforms at some stations, which will to improve as more earthquakes are recorded. This contrasts with other aspects, such as fitting bandwidth and source and path variability, which are unlikely to change in the future and will ultimately be the limiting factor in κ0 resolution. Overall, our results suggest that the bias-correction scheme presented here could potentially be used in other regions where small-magnitude earthquakes are prevalent. However, future work should look to verify that bias-corrected κ estimates show consistency with those retrieved from higher magnitude earthquakes.