University of the Aegean

About: University of the Aegean is a education organization based out in Mytilene, Greece. It is known for research contribution in the topics: Population & Context (language use). The organization has 2818 authors who have published 8100 publications receiving 179275 citations. The organization is also known as: UAEG.

General stabilizing effects of plant diversity on grassland productivity through population asynchrony and overyielding

Abstract: Insurance effects of biodiversity can stabilize the functioning of multispecies ecosystems against environmental variability when differential species' responses lead to asynchronous population dynamics. When responses are not perfectly positively correlated, declines in some populations are compensated by increases in others, smoothing variability in ecosystem productivity. This variance reduction effect of biodiversity is analogous to the risk-spreading benefits of diverse investment portfolios in financial markets. We use data from the BIODEPTH network of grassland biodiversity experiments to perform a general test for stabilizing effects of plant diversity on the temporal variability of individual species, functional groups, and aggregate communities. We tested three potential mechanisms: reduction of temporal variability through population asynchrony; enhancement of long-term average performance through positive selection effects; and increases in the temporal mean due to overyielding. Our results support a stabilizing effect of diversity on the temporal variability of grassland aboveground annual net primary production through two mechanisms. Two-species communities with greater population asynchrony were more stable in their average production over time due to compensatory fluctuations. Overyielding also stabilized productivity by increasing levels of average biomass production relative to temporal variability. However, there was no evidence for a performance-enhancing effect on the temporal mean through positive selection effects. In combination with previous work, our results suggest that stabilizing effects of diversity on community productivity through population asynchrony and overyielding appear to be general in grassland ecosystems.

Local adaptation enhances performance of common plant species

Abstract: Geographic variation can lead to the evolution of different local varieties, even in widespread forage plants. We investigated the performance of common forage plants in relation to their genetic diversity and local adaptation at a continental scale using reciprocal transplants at eight field sites across Europe over a 2-year period. The overall performance of the three test species, Trifolium pratense, Dactylis glomerata, Plantago lanceolata, was generally highest for plants replanted at their home site and declined with increasing transplanting distance. The three species differed in the fitness components responsible for the increased overall performance and selection advantage at home sites. In addition to the effects of local adaptation, the majority of measured traits in all three species also showed ecotypic variation. However, no single ecotype of any species was able to outperform the locally adapted strains and do best at all sites, highlighting the importance of maintaining these plant genetic resources.

The Economics of Tourism

Abstract: 1. The scope and limitations of economic analysis 2. The microfoundations of tourism demand 3. Empirical studies of tourism demand 4. The theory of tourism supply and its market structure 5. The structure, performance and strategies of tourism firms 6. Tourism in an international context 7. Tourism and environmental issues 8. Environmental valuation and sustainability 9. Conclusions

Emotional intelligence in the workplace: exploring its effects on occupational stress and organizational commitment

Abstract: The purpose of the present study is to explore the relationship between emotional intelligence and sources of occupational stress and outcomes on a sample of professionals in mental health institutions. A total of 212 participants were administered the Emotional Intelligence Questionnaire as well as the Organizational Stress Screening Tool (ASSET), a new organizational screening tool, which measures workplace stress. The results were in the expected direction showing a negative correlation between emotional intelligence and stress at work, indicating that high scorers in overall EI suffered less stress related to occupational environment. A positive correlation was also found between emotional intelligence and organizational commitment, which according to the ASSET model is considered as a consequence of stress, suggesting a new role for EI as a determinant of employee loyalty to organizations. Finally, the relationship between EI, job stress, and various demographic variables such as gender, age, and education was investigated and results are discussed in the light of the organizational framework.