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Thermal disruption of transitive hierarchies in Mediterranean ant communities
In Mediterranean communities, where environmental factors show important daily and seasonal variations, the limited thermal tolerance of behaviourally dominant species compared with that of subordinates disrupts the expected transitive hierarchies and allows a far greater dominance in the ecosystem by subordinate species than might be expected from their relative abundance and fighting abilities.
The role of competition by dominants and temperature in the foraging of subordinate species in Mediterranean ant communities
The results suggest that the foraging of subordinate ant species in open Mediterranean habitats is influenced more by temperature than by competition of dominants, although an effect of dominant on subordinates has been shown in a few cases.
Critical thermal limits in Mediterranean ant species: trade‐off between mortality risk and foraging performance
A wide range of thermal niches may be one reason why Mediterranean ant faunas are so diverse in the face of limited diversity in vegetation and habitat structure: the daily range of temperature may be sufficiently great to meet the requirement both of heat- adapted and cold-adapted species as well as a spectrum of intermediate forms.
Floral integration, phenotypic covariance structure and pollinator variation in bumblebee‐pollinated Helleborus foetidus
Results of this study suggest that between‐population differences in magnitude and pattern of floral integration in H. foetidus are probably best explained as a consequence of random genetic sampling in the characteristically small and ephemeral populations of this species, rather than reflecting the selective action of current pollinators.
Patterns of diversity and composition of Mediterranean ground ant communities tracking spatial and temporal variability in the thermal environment
The overall conclusion from this study is that ground ant communities in open areas are primarily regulated by temperature variations, while in shrublands and forests, dominant species are more abundant, and competitive interactions appear to be the major structuring force.
Flowering phenology, floral traits and pollinator composition in a herbaceous Mediterranean plant community
Results indicate that the observed patterns of visitor distribution among plants were most affected by pollen-nectar rewards.
Links between worker polymorphism and thermal biology in a thermophilic ant species
The role of the broadly polymorphic worker caste of the thermophilic ant Cataglyphis velox is discussed and it is shown that it implies greater variability of responses to temperature, which increases the overall period of external activity, and enhances colony success.
Geographical variation in autonomous self-pollination levels unrelated to pollinator service in Helleborus foetidus (Ranunculaceae).
Autonomous self-pollination may be considered as a mechanism enhancing plant reproductive success when plant access to pollen sources may limit seed production. We have studied the relationship
Geographical variation in diaspore traits of an ant-dispersed plant (Helleborus foetidus): are ant community composition and diaspore traits correlated?
Comparison of ant sizes, position on a Principal Components Analysis of seed traits, and indirect estimates of dispersal success, suggests that there is a mosaic of wellmatched and mismatched situations which probably obscures the overall relationships among seed traits and ant assemblages.
Distinctive life traits and distribution along environmental gradients of dominant and subordinate Mediterranean ant species
A set of life traits of the most common Iberian ant species is identified that has enabled us to characterise groups of dominant and subordinate species, and the differences between dominants and subordinates fall into two main categories: resource exploitation and thermal tolerance.