Parallel evolution of integrated craniofacial traits in trophic specialist pupfishes.

Populations may adapt to similar environments via parallel or non-parallel genetic changes, but the frequency of these alternative mechanisms and underlying contributing factors are still poorly understood outside model systems. We used QTL mapping to investigate the genetic basis of highly divergent craniofacial traits between the scale-eater (Cyprinodon desquamator) and molluscivore (C. brontotheroides) pupfish adapting to two different hypersaline lake environments on San Salvador Island, Bahamas. We lab-reared F2 scale-eater x molluscivore intercrosses from two different lake populations, estimated linkage maps, scanned for significant QTL for 29 skeletal and craniofacial traits, female mate preference, and sex. We compared the location of QTL between lakes to quantify parallel and non-parallel genetic changes. We detected significant QTL for six craniofacial traits in at least one lake. However, nearly all shared QTL loci were associated with a different craniofacial trait within each lake. Therefore, our estimate of parallel evolution of craniofacial genetic architecture could range from one out of six identical trait QTL (low parallelism) to five out of six integrated trait QTL (high parallelism). We suggest that pleiotropy and trait integration can affect estimates of parallel evolution, particularly within rapid radiations. We also observed increased adaptive introgression in shared QTL regions, suggesting that gene flow contributed to parallel evolution. Overall, our results suggest that the same genomic regions may contribute to parallel adaptation across integrated suites of craniofacial traits, rather than specific traits, and highlight the need for a more expansive definition of parallel evolution.

'In our culture, we come when you die': Qualitative descriptive analysis of end-of-life perspectives in a reservation-based community.

AIM: To explore (1) perspectives and attitudes of Native Americans regarding transitions from serious illness to death, and (2) awareness about hospice and palliative care service models in a Great Plains reservation-based community. DESIGN: Qualitative descriptive study. METHODS: Community members and clinicians were invited to participate in a semi-structured focus group or interview by Tribal Advisory Board members. Analysis involved three phases: (1) qualitative descriptive analysis of preliminary themes using the Addressing Palliative Care Disparities conceptual model; (2) a cultural review of the data; and (3) reflexive thematic analysis to synthesize findings. RESULTS: Twenty-six participants engaged in two focus groups (n = 5-6 participants in each) and interviews (n = 15). Four themes were derived from their stories: (1) family connectedness is always priority; (2) end-of-life support is a community-wide effort; (3) everyone must grieve in their own way to heal; and (4) support needs from outside the community. CONCLUSION: Findings highlight cultural considerations spanning the life course. Clinicians, researchers and traditional wisdom keepers and practitioners, particularly those working in rural and/or reservation-based settings, must provide culturally safe care. This must include acknowledging and prioritizing the needs and preferences of Native American patients and the impact on their families and communities. IMPACT AND IMPLICATIONS FOR THE PROFESSION: Leveraging community assets, such as family and social networks, is key for supporting Native American patients with serious illnesses. Additionally, facilitating greater family and caregiver involvement along a patient's care trajectory may be a pathway for easing health care workers' caseloads in reservation-based areas, where resources are limited. REPORTING METHOD: The Consolidated Criteria for Reporting Qualitative Research (COREQ) guideline was used. PATIENT/PUBLIC CONTRIBUTION: The study was ideated based on community insight. Tribal Advisory Board members oversaw all aspects including recruitment, data acquisition, interpretation of findings and tribal data dissemination.

Culturally Safe Mentoring for American Indian Nursing Students.

Being the least-represented ethnic/racial group in college settings, American Indian students may experience loneliness and self-doubt related to the challenges of adapting to an environment that embodies values, norms, and culture so different from those represented in their traditional culture. Ongoing health disparities and psychosocial inequities, and persisting impacts of historical colonization, have led to additional hardships for these students that further complicate their academic experiences. Fostering culturally safe learning environments where compassionate and caring faculty provide culturally aligned teaching is important in addressing these complex disparities. Derived from American Indian values and teachings, we present a culturally safe intergenerational mentoring approach that emphasizes the nursing mentors' responsibility to support the growth and success of American Indian nursing students. This approach, drawn from the wisdom of American Indian teachings, focuses on students' strengths and culturally based protective factors. Culturally informed faculty who are aware of the historical impacts of colonization and who have adequate mentoring capacity (time, interest, and commitment) contribute to safe and effective learning environments. Culturally safe mentoring is one approach to promoting American Indian students' potential for academic and professional success.

Diné (Navajo) Traditional Knowledge Holders' Perspective of COVID-19.

From the start of the COVID-19 pandemic on the Navajo Nation, Diné (Navajo) traditional knowledge holders (TKHs), such as medicine men and women and traditional practitioners, contributed their services and healing practices. Although TKHs are not always fully acknowledged in the western health care system, they have an established role to protect and promote the health of Diné people. To date, their roles in mitigating the COVID-19 pandemic have not been fully explored. The purpose of this research was to understand the social and cultural contexts of the COVID-19 pandemic and vaccines based on the roles and perspectives of Diné TKHs. A multi-investigator consensus analysis was conducted by six American Indian researchers using interviews with TKHs collected between December 2021-January 2022. The Hózhó Resilience Model was used as a framework to analyze the data using four parent themes: COVID-19, harmony and relationships, spirituality, and respect for self and discipline. These parent themes were further organized into promoters and/or barriers for 12 sub-themes that emerged from the data, such as traditional knowledge, Diné identity, and vaccine. Overall, the analysis showed key factors that could be applied in pandemic planning and public health mitigation efforts based on the cultural perspective of TKHs.

A mixed-methods study protocol on factors contributing to suicide clusters among Native American youth in a northern plains reservation.

Introduction: Suicide and suicide clusters within Native American Reservation communities are devastating to the entire community and increase individuals' risk for suicide over the lifespan. The objective of this paper is to describe the Indigenous community-based participatory research protocol implemented in partnership with the Fort Belknap Indian Community in Montana, United States. The study protocol was developed to understand suicide risk and protective factors, and community-derived solutions, in a reservation community with history of a suicide cluster and high rates of youth suicide. Methods: In this mixed-methods study, qualitative data from youth, adults, and service providers and quantitative data from 200 adolescents and young adults (aged 14-24 years) were collected in Fort Belknap, Montana from May - December of 2022. Qualitative data were collected first via in-depth interviews and focus groups. Survey questions included validated and pre-tested measures of factors youth experience across socio-ecological levels. Thematic analysis was applied to the qualitative data; and logistic regression models were used to examine relationships within the quantitative data. Discussion: This study will add a multi-dimensional perspective to our current understanding of (1) risk and protective factors for suicide, community-derived postvention solutions, and insights on community assets, and (2) the current health and psychosocial status of youth in the Fort Belknap community. This study may serve as an exemplar of co-created, culturally safe solutions designed to address mental health resource gaps. Next steps include development of a suicide crisis response tool kit and a culturally aligned postvention intervention that will enhance individual, family, and community survivance.

Multiple performance peaks for scale-biting in an adaptive radiation of pupfishes.

The physical interactions between organisms and their environment ultimately shape their rate of speciation and adaptive radiation, but the contributions of biomechanics to evolutionary divergence are frequently overlooked. Here we investigated an adaptive radiation of Cyprinodon pupfishes to measure the relationship between feeding kinematics and performance during adaptation to a novel trophic niche, lepidophagy, in which a predator removes only the scales, mucus, and sometimes tissue from their prey using scraping and biting attacks. We used high-speed video to film scale-biting strikes on gelatin cubes by scale-eater, molluscivore, generalist, and hybrid pupfishes and subsequently measured the dimensions of each bite. We then trained the SLEAP machine-learning animal tracking model to measure kinematic landmarks and automatically scored over 100,000 frames from 227 recorded strikes. Scale-eaters exhibited increased peak gape and greater bite length; however, substantial within-individual kinematic variation resulted in poor discrimination of strikes by species or strike type. Nonetheless, a complex performance landscape with two distinct peaks best predicted gel-biting performance, corresponding to a significant nonlinear interaction between peak gape and peak jaw protrusion in which scale-eaters and their hybrids occupied a second performance peak requiring larger peak gape and greater jaw protrusion. A bite performance valley separating scale-eaters from other species may have contributed to their rapid evolution and is consistent with multiple estimates of a multi-peak fitness landscape in the wild. We thus present an efficient deep-learning automated pipeline for kinematic analyses of feeding strikes and a new biomechanical model for understanding the performance and rapid evolution of a rare trophic niche.

Trophic specialization on unique resources despite limited niche divergence in a celebrated example of sympatric speciation.

Trophic niche partitioning is observed in many adaptive radiations and is hypothesized to be a central process underlying species divergence. However, patterns of dietary niche partitioning are inconsistent across radiations and there are few studies of niche partitioning in putative examples of sympatric speciation. Here, we conducted the first quantitative study of dietary niche partitioning using stomach contents and stable isotope analyses in one of the most celebrated examples of sympatric speciation: the cichlid radiation from crater lake Barombi Mbo, Cameroon. We found little evidence for trophic niche partitioning among cichlids, including the nine species coexisting in the narrow littoral zone. Stable isotope analyses supported these conclusions of substantial dietary overlap. Our data, however, did reveal that five of eleven species consume rare dietary items, including freshwater sponge, terrestrial ants, and nocturnal foraging on shrimp. Stomach contents of the spongivore (Pungu maclareni) were 20% freshwater sponge, notable considering that only 0.04% of all fishes consume sponges. Overall, we conclude that cichlid species in lake Barombi Mbo overlap considerably in broad dietary niches-in part due to the large proportion of detritus in the stomach contents of all species-but there is evidence for divergence among species in their diet specializations on unique resources. We speculate that these species may utilize these additional specialized resources during periods of low resource abundance in support of Liem's paradox.

Diné (Navajo) Female Perspectives on Mother-Daughter Cultural Assets Around the Transition to Womanhood: A Qualitative Study.

INTRODUCTION: American Indian (AI) people have protective factors embedded in cultural teachings that buffer against high-risk behaviors. This study applies a qualitative, grounded theory approach to identify cultural assets for a Diné (Navajo) mother-daughter intervention aimed at preventing substance abuse and teen pregnancy. METHOD: Focus groups and in-depth interviews were conducted with 28 AI females' ages 8 years and older from the Navajo Nation. RESULTS: Key themes were (a) preserving the Diné way of life, (b) cultural assets related to being a healthy Diné woman, (c) matrilineal networks as a source of strength/pride, (d) historical trauma as a source of resilience, (e) male influences as protective health factors, (f) Western education as a measure of success, and (g) integrating different belief systems. DISCUSSION: Study findings may be applied as foundational elements for culturally grounded AI substance abuse and teen pregnancy prevention strategies, as well as culturally safe nursing practice.

Development of an American Indian Diabetes Education Cultural Supplement: A Qualitative Approach.

OBJECTIVE: The purpose of this study was to culturally enhance a diabetes education program for Diné (Navajo) community members with Type 2 diabetes. Though the recommendation to culturally adapt health education curricula was meant to improve health education for American Indians and Alaskan Natives (AIANs), it has inadvertently created a "one size fits all" approach. This approach does not properly address the need for tribe-specific cultural health messaging, defined as incorporating cultural elements deemed relevant to the population. Tribe-specific health information and programming, such as integrating Diné worldviews and Indigenous knowledge among Diné people as described here, are essential to creating a culturally relevant and effective and meaningful approach to disease self-management. METHODS: A conversation guide, based on the Hózhó Resilience Model-a Diné framework on healthy living, was used to engage key cultural experts in interviews about traditional stories and teachings regarding health and wellness. Three specific self-care behaviors relevant to Type 2 diabetes self-management were discussed: (1) healthy eating, (2) physical activity, and (3) healthy coping. Interviews were audio-recorded, transcribed and analyzed using a qualitative thematic analysis method. RESULTS: Diné healers and cultural experts informed the development of an educational tool called Diné Health. Key themes that emerged from the data included the importance of discipline, positivity and mindfulness in the context of Hózhó. CONCLUSION: Culturally safe and meaningful engagement with cultural leaders and the use of qualitative research methods can inform deep-level cultural adaptations essential to developing tribe-specific diabetes education programs. The approaches used here can guide the development, implementation, and testing of culturally-informed health education for AIAN populations.

The Generational Impact Of Racism On Health: Voices From American Indian Communities.

Structural racism toward American Indians and Alaska Natives is found in nearly every policy regarding and action taken toward that population since non-Natives made first contact with the Indigenous peoples of the United States. Generations of American Indians and Alaska Natives have suffered from policies that called for their genocide as well as policies intended to acculturate and dominate them-such as the sentiment from Richard Henry Pratt to "kill the Indian…, save the man." The intergenerational effect is one that has left American Indians and Alaska Natives at the margins of health and the health care system. The effect is devastating psychologically, eroding a value system that is based on community and the sanctity of all creation. Using stories we collected from American Indian people who have experienced the results of racist policies, we describe historical trauma and its links to the health of American Indians and Alaska Natives. We develop two case studies around these stories, including one from a member of the Navajo Nation's experiences during the COVID-19 pandemic, to illustrate biases in institutionalized structures. Finally, we describe how the American Indian and Alaska Native Cultural Wisdom Declaration can help policy makers eliminate the effect of systemic racism on the health of American Indians and Alaska Natives-for instance, by lifting constraints on federal funding for American Indian and Alaska Native initiatives and allowing payment to traditional healers for their health services.

A vertebrate adaptive radiation is assembled from an ancient and disjunct spatiotemporal landscape.

To investigate the origins and stages of vertebrate adaptive radiation, we reconstructed the spatial and temporal histories of adaptive alleles underlying major phenotypic axes of diversification from the genomes of 202 Caribbean pupfishes. On a single Bahamian island, ancient standing variation from disjunct geographic sources was reassembled into new combinations under strong directional selection for adaptation to the novel trophic niches of scale-eating and molluscivory. We found evidence for two longstanding hypotheses of adaptive radiation: hybrid swarm origins and temporal stages of adaptation. Using a combination of population genomics, transcriptomics, and genome-wide association mapping, we demonstrate that this microendemic adaptive radiation of novel trophic specialists on San Salvador Island, Bahamas experienced twice as much adaptive introgression as generalist populations on neighboring islands and that adaptive divergence occurred in stages. First, standing regulatory variation in genes associated with feeding behavior (prlh, cfap20, and rmi1) were swept to fixation by selection, then standing regulatory variation in genes associated with craniofacial and muscular development (itga5, ext1, cyp26b1, and galr2) and finally the only de novo nonsynonymous substitution in an osteogenic transcription factor and oncogene (twist1) swept to fixation most recently. Our results demonstrate how ancient alleles maintained in distinct environmental refugia can be assembled into new adaptive combinations and provide a framework for reconstructing the spatiotemporal landscape of adaptation and speciation.

Asymmetric reinforcement in Lucania killifish: assessing reproductive isolation when both sexes choose.

Reinforcement can occur when maladaptive hybridization in sympatry favors the evolution of conspecific preferences and target traits that promote behavioral isolation (BI). In many systems, enhanced BI is due to increased female preference for conspecifics. In others, BI is driven by male preference, and in other systems both sexes exert preferences. Some of these patterns can be attributed to classic sex-specific costs and benefits of preference. Alternatively, sex differences in conspecific preference can emerge due to asymmetric postzygotic isolation (e.g., hybrid offspring from female A × male B have lower fitness than hybrid offspring from female B × male A), which can lead to asymmetric BI (e.g., female A and male B are less likely to mate than female B and male A). Understanding reinforcement requires understanding how conspecific preferences evolve in sympatry. Yet, estimating conspecific preferences can be difficult when both sexes are choosy. In this study, we use Lucania killifish to test the hypothesis that patterns of reinforcement are driven by asymmetric postzygotic isolation between species. If true, we predicted that sympatric female Lucania goodei and sympatric male L. parva should have lower levels of BI compared with their sympatric counterparts, as they produce hybrid offspring with the highest fitness. To address the problem of measuring BI when both sexes are choosy, we inferred the contribution to BI of each partner using assays where one sex in the mating pair comes from an allopatric population with potentially low preference, whereas the other comes from a sympatric population with high preference. For one hybrid cross direction, we found that both female L. parva and male L. goodei have high contributions to BI in sympatry. In the other hybrid cross direction, we found that only female L. goodei contribute to BI. Sympatric male L. parva readily engaged in hybrid spawnings with allopatric L. goodei females. These results indicate that both asymmetric postzygotic isolation and the traditional sex-specific costs to preference likely affect the nature of selection on conspecific preferences and target traits.

The Diné (Navajo) Hózhó Lifeway: A Focused Ethnography on Intergenerational Understanding of American Indian Cultural Wisdom.

Purpose: Hózhó is the cultural wisdom that guides the Diné lifeway. This study examines understanding of cultural wisdom (CW) across three generations: elders, adults, and adolescents. Method: A focused ethnography was conducted on the Navajo Nation. Twenty-two Diné (Navajo) were recruited through convenience sampling. Data were collected via two semistructured interviews and photovoice methods. Data were analyzed using content analysis, thematic analysis, and participatory visual analysis of photos. Results: The Diné elders embodied the greatest in-depth understanding of CW followed by the adolescents. An unexpected finding was the scarcity of understanding of CW among the adults. Conclusion: The Diné understanding of CW is transferred through discussion with elders, listening to and speaking traditional language, cultural preservation activities, and participation in cultural practices. The Diné believe cultural wisdom is a health sustaining protective factor, therefore strategies to restore, promote, and support the intergenerational transfer of cultural wisdom remains a tribal priority.

How Should Allopathic Physicians Respond to Native American Patients Hesitant About Allopathic Medicine?

American Indian (AI) and Indigenous peoples utilize traditional medicine/healing (TM/H) for health and well-being. Allopathic health care practitioners (HCPs) receive minimal training and education on TM/H and its application and integration into health care settings. Lack of knowledge and practice guidelines on how to navigate these 2 health care perspectives (allopathic and traditional) creates uncertainties in the treatment of AI and Indigenous peoples. Such conflicts can undermine patient autonomy and result in culturally incongruent practice. This article presents a case study showcasing suggestions for how HCPs can direct clinical decision making when working with AI/Indigenous patients who utilize TM/H. The article argues that health professions education institutions and HCPs must dedicate effort to expanding awareness of and education about TM/H to enhance the delivery of evidence-based and integrated clinical treatment for AI/Indigenous patients.

Oral shelling within an adaptive radiation of pupfishes: Testing the adaptive function of a novel nasal protrusion and behavioural preference.

Dietary specialization on hard prey items, such as mollusks and crustaceans, is commonly observed in a diverse array of fish species. Many fish consume these types of prey by crushing the shell to consume the soft tissue within, but a few fishes extricate the soft tissue without breaking the shell using a method known as oral shelling. Oral shelling involves pulling a mollusc from its shell and it may be a way to subvert an otherwise insurmountable shell defence. However, the biomechanical requirements and potential adaptations for oral shelling are unknown. Here, we test the hypothesis that a novel nasal protrusion is an adaptation for oral shelling in the durophagous pupfish (Cyprinodon brontotheroides). We first demonstrate oral shelling in this species and then predict that a larger nasal protrusion would allow pupfish to consume larger snails. Durophagous pupfish are found within an endemic radiation of pupfish on San Salvador Island, Bahamas. We took advantage of closely related sympatric species and outgroups to test: (a) whether durophagous pupfish shell and consume more snails than other species, (b) if F1 and F2 durophagous hybrids consume similar amounts of snails as purebred durophagous pupfish, and (c) if nasal protrusion size in parental and hybrid populations increases the maximum size of consumed snails. We found that durophagous pupfish and their hybrids consumed the most snails, but did not find a strong association between nasal protrusion size and maximum snail size consumed within the parental or F2 hybrid population, suggesting that the size of their novel nasal protrusion does not provide a major benefit in oral shelling. Instead, we suggest that the nasal protrusion may increase feeding efficiency, act as a sensory organ, or is a sexually selected trait, and that a strong feeding preference may be most important for oral shelling.

Rapid adaptive evolution of scale-eating kinematics to a novel ecological niche.

The origins of novel trophic specialization, in which organisms begin to exploit resources for the first time, may be explained by shifts in behavior such as foraging preferences or feeding kinematics. One way to investigate behavioral mechanisms underlying ecological novelty is by comparing prey capture kinematics among species. We investigated the contribution of kinematics to the origins of a novel ecological niche for scale-eating within a microendemic adaptive radiation of pupfishes on San Salvador Island, Bahamas. We compared prey capture kinematics across three species of pupfish while they consumed shrimp and scales in the lab, and found that scale-eating pupfish exhibited peak gape sizes twice as large as in other species, but also attacked prey with a more obtuse angle between their lower jaw and suspensorium. We then investigated how this variation in feeding kinematics could explain scale-biting performance by measuring bite size (surface area removed) from standardized gelatin cubes. We found that a combination of larger peak gape and more obtuse lower jaw and suspensorium angles resulted in approximately 40% more surface area removed per strike, indicating that scale-eaters may reside on a performance optimum for scale biting. To test whether feeding performance could contribute to reproductive isolation between species, we also measured F1 hybrids and found that their kinematics and performance more closely resembled generalists, suggesting that F1 hybrids may have low fitness in the scale-eating niche. Ultimately, our results suggest that the evolution of strike kinematics in this radiation is an adaptation to the novel niche of scale eating.

The behavioral origins of novelty: did increased aggression lead to scale-eating in pupfishes?

Behavioral changes in a new environment are often assumed to precede the origins of evolutionary novelties. Here, we examined whether an increase in aggression is associated with a novel scale-eating trophic niche within a recent radiation of Cyprinodon pupfishes endemic to San Salvador Island, Bahamas. We measured aggression using multiple behavioral assays and used transcriptomic analyses to identify differentially expressed genes in aggression and other behavioral pathways across 3 sympatric species in the San Salvador radiation (generalist, snail-eating specialist, and scale-eating specialist) and 2 generalist outgroups. Surprisingly, we found increased behavioral aggression and differential expression of aggression-related pathways in both the scale-eating and snail-eating specialists, despite their independent evolutionary origins. Increased behavioral aggression varied across both sex and stimulus context in both species. Our results indicate that aggression is not unique to scale-eating specialists. Instead, selection may increase aggression in other contexts such as niche specialization in general or mate competition. Alternatively, increased aggression may result from indirect selection on craniofacial traits, pigmentation, or metabolism-all traits which are highly divergent, exhibit signs of selective sweeps, and are affected by aggression-related genetic pathways which are differentially expressed in this system. In conclusion, the evolution of a novel predatory trophic niche within a recent adaptive radiation does not have clear-cut behavioral origins as previously assumed, highlighting the multivariate nature of adaptation and the complex integration of behavior with other phenotypic traits.

Autoantibodies of IgM and IgG classes show differences in recognition of multiple autoantigens in chronic obstructive pulmonary disease.

Autoimmunity occurs in chronic obstructive pulmonary disease (COPD). We describe an antigen microarray for detecting serum autoantibodies (AAbs) to determine how IgM, as well as IgG, AAbs distinguish patients with COPD from controls with a history of smoking without COPD. All COPD patients' sera contained elevated levels of AAbs to some of 30 autoantigens. There were significant differences in the autoantigenic specificities of IgM AAbs compared to IgG AAbs in the COPD sera: for example, AAbs to histone and scl-70 were mainly IgG, whereas AAbs to CENP-B and La/ssB were mainly IgM; by contrast, IgM and IgG AAbs to collagen-V were equally prevalent. Thus, a combination of IgM and IgG AAbs specific for multiple autoantigens are detected in all cases of COPD at a level at which all non-COPD controls are negative for AAbs. This highlights the importance of different classes of AAbs to a range of autoantigens in COPD.