First Record of Fungal Diversity in the Tropical and Warm-Temperate Middle Miocene Climate Optimum Forests of Eurasia

The middle Miocene Climate Optimum (MMCO) was the warmest interval of the last 23 million years and is one of the best analogs for proposed future climate change scenarios. Fungi play a key role in the terrestrial carbon cycle as dominant decomposers of plant debris, and through their interactions with plants and other organisms as symbionts, parasites, and endobionts. Thus, their study in the fossil record, especially during the MMCO, is essential to better understand biodiversity changes and terrestrial carbon cycle dynamics in past analogous environments, as well as to model future ecological and climatic scenarios. The fossil record also offers a unique long-term, large-scale dataset to evaluate fungal assemblage dynamics across long temporal and spatial scales, providing a better understanding of how ecological factors influenced assemblage development through time. In this study, we assessed the fungal diversity and community composition recorded in two geological sections from the middle Miocene from the coal mines of Thailand and Slovakia. We used presence-absence data to quantify the fungal diversity of each locality. Spores and other fungal remains were identified to modern taxa whenever possible; laboratory codes and fossil names were used when this correlation was not possible. This study represents the first of its kind for Thailand, and it expands existing work from Slovakia. Our results indicate a total of 281 morphotaxa. This work will allow us to use modern ecological data to make inferences about ecosystem characteristics and community dynamics for the studied regions. It opens new horizons for the study of past fungal diversity based on modern fungal ecological analyses. It also sheds light on how global variations in fungal species richness and community composition were affected by different climatic conditions and under rapid increases of temperature in the past to make inferences for the near climatic future

A social mind:The context of John Turner's work and its influence

We review John Turner's contribution to social psychology and his ongoing influence on the field. We provide an account of his research and theorising framed by the two major theoretical frameworks which he developed: social identity theory (together with Henri Tajfel) and self-categorisation theory. We elaborate the contribution of his work in developing an understanding of intergroup relations (in social identity theory) and specifying the social nature of the self, the salience of social identities, and of the importance of social identity for social influence, stereotyping, power, and leadership (within self-categorisation theory). We then locate these research programmes within Turner's broader meta-theoretical goal of addressing major problems, issues, and themes within social psychology. These centre on (a) a critique of the pervasive anti-collectivism within much of social psychology, (b) a normative/political agenda for social change, and (c) a commitment to the social nature of the individual mind. These themes explicitly or implicitly infused his research and continue to inspire much of the work in the theoretical tradition that he pioneered

Subjective uncertainty and intergroup discrimination in the minimal group situation

Minimal group studies are sometimes interpreted as showing that social categorization per se inevitably produces discrimination. Self-categorization theory clarifies this point, suggesting that a process of self-categorization must occur to transform an external categorization into an internalized representation Hogg and Abrams suggest that the underlying motive for self-categorization is the reduction of subjective uncertainty. Two minimal group experiments employing different manipulations of uncertainty were conducted in which categorization and subjective uncertainty were manipulated in a 2 x 2 design. Across both studies, as hypothesized, intergroup discrimination only occurred when participants were categorized under conditions of subjective uncertainty. This was accompanied by enhanced group identification and elevated self-esteem. It is concluded that categorization per se is necessary but not sufficient for discrimination-people must self-categorize, and this is motivated by a need for subjective uncertainty reduction. Discrimination is not an inevitable outcome of categorization