An inferior competitor is a successful invader due to its stress tolerance and productivity.

The invasion of ecosystems by non-native species is recognized as one of the most significant global challenges, particularly in semiarid regions where native biodiversity is already under stress from drought and land degradation. The implicit assumption is that invaders are strong competitors, but a greenhouse pairwise experiment conducted to examine intraspecific and interspecific competition effects of Opuntia ficus-indica, a widespread invader in semiarid ecosystems, with two species native to the highlands of Eritrea, Ricinus communis and Solanum marginatum, revealed that O. ficus-indica is a weak competitor. The unique ability of O. ficus-indica's fallen cladodes to undergo vegetative growth becomes a fundamental trait contributing to its spread. This growth strategy allows O. ficus-indica to outgrow native species and establish a significant presence. In direct interaction, the competition in aboveground productivity measured by the logarithmic response ratio for O. ficus-indica was 3.4-fold and 5.9-fold higher than for R. communis and S. marginatum, respectively. Belowground, the native R. communis was facilitated (- 1.00 ± 0.69) by O. ficus-indica which itself suffered from high competition. This pattern became even more evident under water shortage, where aboveground competition for S. marginatum decreased 5.7-fold, and for O. ficus-indica, it increased 1.4-fold. Despite being a poor competitor, O. ficus-indica outperformed R. communis and S. marginatum in both aboveground (4.3 and 3.8 times more) and belowground (27 and 2.8 times more) biomass production, respectively. The findings of this study challenge the common interpretation that invasive species are strong competitors and highlight the importance of considering other factors, such as productivity and tolerance limits when assessing the potential impacts of invasive species on semiarid ecosystems.

Increased Plasticity in Invasive Populations of a Globally Invasive Cactus.

Biological invasions pose global threats to biodiversity and ecosystem functions. Invasive species often display a high degree of phenotypic plasticity, enabling them to adapt to new environments. This study examines plasticity to water stress in native and invasive Opuntia ficus-indica populations, a prevalent invader in arid and semi-arid ecosystems. Through controlled greenhouse experiments, we evaluated three native and nine invasive populations. While all plants survived the dry treatment, natives exhibited lower plasticity to high water availability with only a 36% aboveground biomass increase compared to the invasives with a greater increase of 94%. In terms of belowground biomass, there was no significant response to increased water availability for native populations, but plants from the invasive populations showed a 75% increase from the dry to the wet treatment. Enhanced phenotypic plasticity observed in invasive populations of O. ficus-indica is likely a significant driver of their success and invasiveness across different regions, particularly with a clear environmental preference towards less arid conditions. Climate change is expected to amplify the invasion success due to the expansion of arid areas and desertification. Opuntia ficus-indica adapts to diverse environments, survives dry spells, and grows rapidly in times of high-water supply, making it a candidate for increased invasion potential with climate change.

Risk Factors for Hepatitis B Virus Infection in North Ethiopia: A Case-Control Study.

Background: Hepatitis B virus infection (HBV) is an important clinical and public health problem that contributes to liver-related public health morbidity and mortality. Although childhood vaccination was introduced in 1980, hospital admissions, morbidity and mortality rates from HBV infection increased in Ethiopia. Risk factors for HBV infection and associated complications generally vary from case to case. No epidemiological studies have identified the risk factors for HBV infection in northern Ethiopia. Therefore, this study aimed to identify risk factors for HBV infection in specialist and teaching hospitals in Ayder. Methods: From March 2019 to May 2019, an unmatched hospital-based case-control study has been carried out on a total of 213 patients [71 cases and 142 controls] in northern Ethiopia. Cases were selected sequentially and two consecutive controls were selected for each case by a simple random method. The data were collected using pretested questionnaires structured by the interviewer as part of a face-to-face interview. Data were entered in Epi Data version 3.1, exported and analyzed with SPSS version 22. Binary and multivariable logistic regression analyses were used. Statistical significance was given as P <0.05. Results: Multivariate logistic regression analysis revealed that patients with familial exposure to hepatitis (AOR 3.7, 95% CI: 1.5-9.01), prior traditional medical procedure (AOR 1.2, 95% CI: 1.08-3.4), any history of dental procedures (AOR 3.8, 95% CI: 1.8-9.01) were associated risk factors to hepatitis B virus infection, and awareness of sexually transmitted hepatitis B virus infection (AOR 0.084, 95% CI: 0.01-0.6) is less likely to be infected with hepatitis B virus infection. Conclusion: This study (findings) demonstrated that contact with a case of hepatitis in the family, history of dentist visits, prior traditional medical procedure, and lack of awareness of its transmission through sexual contact have been identified as independent risk factors for the development of hepatitis B virus infection.

Trends in and predictors of animal source food consumption among 6-23 months age children in Tigrai, Northern Ethiopia: evidence from three consecutive ethiopian demographic and health surveys, EDHS 2005-2016.

BACKGROUND: Despite numerous interventions, child undernutrition continues as a problem of global concern. Although consumption of animal source foods has shown positive associations with child undernutrition, no much evidence exists on its trends and predictors among children in Tigrai. OBJECTIVES: This study aimed to investigate the trends in and predictors of consumption of animal source foods among children 6-23 months of age in Tigrai. METHODOLOGY: This study used complex data of 756 children extracted from three consecutive Ethiopian Demographic and Health Surveys. Data were analyzed using STATA 14.0 by accounting for sampling weight and cluster and strata variables. Multivariable logistic regression was used to determine the independent predictors of animal source foods consumption. Odds ratio and 95% confidence interval were used to measure strength of association at a statistical significance of p < 0.05. RESULTS: Although statistically not significant (p-trend = 0.28), animal source foods consumption increased from 31.3% to 2005 through 35.9% in 2011 to 41.5% in 2016. For every month increase in the age of a child, a 9% increment in the odds of animal source food consumption was observed. Muslim children showed 3.1 times higher odds of animal source food consumption than Orthodox Christians. The likelihood of animal source foods consumption were 33% lower among children born to mothers who didn't attend formal education as compared to their counterparts. A unit increase in the number of household assets and number of livestock led to a 20% and 2% increase in the odds of animal source foods consumption, respectively. CONCLUSION: Animal source foods consumption showed a statistically non-significant increase over the three consecutive Ethiopian Demographic and Health Surveys. This study found out that consumption of animal source foods might be increased through pro-maternal education policies, programs with household asset increasing schemes, and pro-livestock projects. Our study also highlighted the need for considering religion as one important player when planning or undertaking ASF programs.

Effect of vaginal scarring on the recovery of surgical repair of obstetric fistula in Northern Ethiopia.

OBJECTIVE: To determine the effect of vaginal scarring on the recovery from surgical repair of obstetric fistula in Northern Ethiopia from 2015 to 2020. METHODS: A hospital-based retrospective cohort study was conducted among 224 women who had obstetric fistula repair surgery in Northern Ethiopia from March 1 to March 31, 2020. Cox proportional hazards regression model was used to determine the adjusted predictors of recovery for each main baseline predictor variable, using 95% confidence interval (CI) and P < 0.05 to declare statistical significance. RESULTS: The overall recovery rate was 57 of 1000 women (43 of 1000 and 73 of 1000 for women with and without vaginal scar, respectively), with an overall median time to recovery from obstetric fistula repair surgery of 15 days. Vaginal scarring (adjusted hazard ratio [aHR], 1.58 [95% CI, 1.13-2.21]), age of the patient (aHR, 4.05 [95% CI, 1.56-10.5]), mode of delivery (aHR, 2.14 [95% CI, 1.31-3.49]), place of delivery (aHR, 1.91 [95% CI, 1.17-3.12]), prior repair (aHR, 1.90 [95% CI, 1.08-3.35]), and duration of catheterization (aHR, 12.91 [95% CI, 7.21-23.13]) were independent predictors of recovery. CONCLUSIONS: In the present study, we found that women who had no vaginal scar, age older than 30 years, facility and spontaneous vaginal delivery, first attempt repair, and shorter duration of catheterization had a shorter recover time.

Clot Stiffness Measured By Seer Sonorheometry As a Marker Of Poor Prognosis In Hospitalized COVID-19 Patients.

A high risk of thrombotic complications has been observed among severely ill COVID-19 patients. Viscoelastic tests (VET) have shown a hypercoagulable profile in these patients, although so far there is no clear evidence on the use of these tools as predictors of risk in the clinical course of patients. In this study we aimed to evaluate the association between Quantra® sonorheometry VET parameters, standard coagulation tests and inflammatory markers in 69 patients with COVID-19 on hospital admission with disease severity and outcome. Inflammatory markers were elevated in a high percentage of patients, as were coagulation-related parameters such as fibrinogen and D-dimer levels. Quantra® sonorheometry analysis revealed increased clot stiffness (CS), especially due to increased fibrinogen contribution (FCS) in 63.7%. Analysis of clot stability to lysis (CSL) on the Quantra showed a value of 100%, suggesting hypofibrinolysis, in 32.4%. Age > 65 years, elevated values of fibrinogen, D-dimer, LDH, increased CS and CSL were significantly associated with worsening disease. The combination of elevated FCS and D-dimer values showed a particularly high prognostic value in distinguishing patients with severe symptomatology. In conclusion, FCS measured by Quantra® system and its combination with D-dimer could be established as a powerful tool to identify poor prognosis in COVID-19 patients on hospital admission.