The evolution of cooperation among nonrelated individuals is one of the fundamental problems in biology and social sciences. Reciprocal altruism fails to provide a solution if interactions are not repeated often enough or groups are too large. Punishment and reward can be very effective but require that defectors can be traced and identified. Here we present a simple but effective mechanism ope...

With the growing recognition of exploiters as a prominent and enduring feature of many mutualisms, there is a need to understand the ecological and evolutionary dynamics of mutualisms in the context of exploitation. Here, we model coevolution between mutualist and exploiter birth rates, using an obligate pollinating seed parasite mutualism associated with a nonpollinating exploiter as a referen...

Mutualisms often involve reciprocal adaptations of both partners. Acacia ant-plants defended by symbiotic Pseudomyrmex ant mutualists secrete sucrose-free extrafloral nectar, which is unattractive to generalists. We aimed to investigate whether this extrafloral nectar can also exclude exploiters, that is nondefending ant species. Mutualist workers discriminated against sucrose whereas exploiter...

The current research is an applied study, which uses field data and avails itself of a descriptive-correlational and causal-correlation design to analyse the relationships between variables. This study was an attempt to identify variables affecting rural participation in cooperatives forest by-products in Ilam. Population of this research is exploiters of forests' by products in Ilam. The numbe...

The bird community in urban areas indicates the species-specific adaptability to conditions such as increase man-made habitats. Urban adapters and exploiters, two groups that make up most of birds, were assessed determine their suitable habitat explain distribution, well environmental predictors for assemblages Depok, one Jakarta’s satellite cities. We used point-count method survey birds three...