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Gender Dysphoria (GD) is defined as significant distress or impairment caused by the discrepancy between an individual's experienced gender and the sex assigned at birth. This work explores the etiology and outcomes of GD through two studies. The first assesses its prevalence in different twin categories, and the second examines the incidence of idiopathic intracranial hypertension (IIH) in individuals undergoing gonadotropin-releasing hormone analogue (GnRHa) treatment for GD. The first study utilizes a population-based approach to analyze the prevalence of GD in twins, using data from a Swedish population-based cohort collected over a 16-year period. The objective is to assess the influence of genetic and environmental factors on the development of GD by comparing its prevalence in different-sex twins, same-sex twins, and non-twin siblings. The results indicate a higher prevalence of GD in different-sex twins and suggest a potential influence of intrauterine factors in the development of GD, necessitating further examination of current genetic and environmental theories. The second study focuses on evaluating the occurrence of IIH in individuals undergoing treatment with GnRHa for GD in Sweden between 2006 and 2016. The study did not observe any cases of IIH within the studied cohort. While better-powered studies are needed to clarify any potential association between GnRHa and IIH, the study results do not present substantial evidence to support this association.

The southern Appalachian Mountains have among the highest salamander diversity in the world, largely due to local speciation in the family Plethodontidae. Plethodontid salamanders (i.e., lungless salamanders) are particularly sensitive to habitat climate conditions due to their reliance on cutaneous respiration, and their immediate environmental conditions (microhabitat) likely influence their dispersion and activity more than the large-scale atmospheric conditions. The Northern Gray-cheeked salamander (Plethodon montanus) is restricted to high elevations in the Appalachian Mountains. Our goal was to investigate the relationship between P. montanus and its microhabitat by examining behavioral preference for climatic conditions, characterizing the microclimate with small-scale models, and testing for differences in stress hormones at different elevations. We found that behavioral preference is most restricted by relative humidity, microclimate models predicted far less prevalence at lower elevations than typical coarse-scale models, and stress hormones were elevated at a low elevation plot compared to a high elevation plot.

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No description available.

No description available.

No description available.

No description available.

No description available.