Floral advertisement scent in a changing plant-pollinators market

Plant-pollinator systems may be considered as biological markets in which pollinators choose between different flowers that advertise their nectar/pollen rewards. Although expected to play a major role in structuring plant-pollinator interactions, community-wide patterns of flower scent signals remain largely unexplored. Here we show for the first time that scent advertisement is higher in plant species that bloom early in the flowering period when pollinators are scarce relative to flowers than in species blooming later in the season when there is a surplus of pollinators relative to flowers. We also show that less abundant flowering species that may compete with dominant species for pollinator visitation early in the flowering period emit much higher proportions of the generalist attractant β-ocimene. Overall, we provide a first community-wide description of the key role of seasonal dynamics of plant-specific flower scent emissions, and reveal the coexistence of contrasting plant signaling strategies in a plant-pollinator market

The Perceived Impacts of Short-Term Rental Platforms: Comparing the United States and United Kingdom

Short-term rental platforms such as Airbnb have enjoyed considerable success in recent years. However, critics accuse the platforms of having negative impacts, leading to gentrification, disruption, and increased rent and house prices. While research has investigated actual impacts of short-term rental platforms, we lack systematic, generalizable, and comparative evidence on the perceived impacts of such platforms, especially from a social exchange perspective and on a country level. To address these shortcomings, we conducted a representative survey in the US and UK with a holistic set of perceived impacts. Using social exchange theory (SET) and applying a range of multi-variate statistical analyses, such as exploratory factor analysis, cluster analysis and discriminant analysis, we systematically compare these two contexts. The findings indicate that US residents assess short-term rental platforms more positively than UK residents, especially for recreational, amenities-oriented and economic impacts. Among respondents who have used short-term rental platforms as guests, the perceptions are more alike between the two countries, suggesting a homogenization effect. We discuss the theoretical and practical implications of the results

Covariation and phenotypic integration in chemical communication displays: biosynthetic constraints and eco-evolutionary implications

Chemical communication is ubiquitous. The identification of conserved structural elements in visual and acoustic communication is well established, but comparable information on chemical communication displays (CCDs) is lacking. We assessed the phenotypic integration of CCDs in a meta-analysis to characterize patterns of covariation in CCDs and identified functional or biosynthetically constrained modules. Poorly integrated plant CCDs (i.e. low covariation between scent compounds) support the notion that plants often utilize one or few key compounds to repel antagonists or to attract pollinators and enemies of herbivores. Animal CCDs (mostly insect pheromones) were usually more integrated than those of plants (i.e. stronger covariation), suggesting that animals communicate via fixed proportions among compounds. Both plant and animal CCDs were composed of modules, which are groups of strongly covarying compounds. Biosynthetic similarity of compounds revealed biosynthetic constraints in the covariation patterns of plant CCDs. We provide a novel perspective on chemical communication and a basis for future investigations on structural properties of CCDs. This will facilitate identifying modules and biosynthetic constraints that may affect the outcome of selection and thus provide a predictive framework for evolutionary trajectories of CCDs in plants and animals