Data from: Does local conspecific density and floral display size influence fruit set via pollinator visitation in Orchis militaris?
Henneresse, Thomas, Université Catholique de Louvain
Kaiser, Aurélien, Université Catholique de Louvain
Wesselingh, Renate A., Université Catholique de Louvain
Tyteca, Daniel, Université Catholique de Louvain
Published Mar 06, 2019 on Dryad.
Cite this dataset
Henneresse, Thomas; Kaiser, Aurélien; Wesselingh, Renate A.; Tyteca, Daniel (2019). Data from: Does local conspecific density and floral display size influence fruit set via pollinator visitation in Orchis militaris? [Dataset]. Dryad. https://doi.org/10.5061/dryad.3db38r1
Plant density varies naturally, from isolated plants to clumped individuals, and can influence pollinator foraging behaviour and plant reproductive success. The effect of conspecific density could depend on the pollination system, and deceptive species differ from rewarding ones in this regard, a high density being often associated with low fruit set in deceptive plants. In our study, we aimed to determine how local conspecific density and floral display size (i.e. number of flowers per plant) affect fruit set in a deceptive orchid (Orchis militaris) through changes in pollinator visitation. We measured fruit set in a natural population and recorded pollinator abundance and foraging behaviour within plots of different O. militaris densities. Detailed data were recorded for the most abundant potential pollinators of O. militaris, i.e. solitary bees. Floral display size was negatively correlated to fruit set in medium-density plots, but uncorrelated in low- and high-density plots. Plot density had no effect on solitary bee abundance and visitation, which may be due to low pollinator abundance within the study site. The proportion of visited flowers per inflorescence was negatively influenced by floral display size, which is in line with previous studies. In addition, solitary bees spent decreasing time in successive flowers within an inflorescence, and the time spent per flower was negatively affected by ambient temperature. Our results suggest that pollinator behaviour during visitation is poorly linked to pollen deposition and reproductive success in O. militaris.
The data file provides data collected in a single Belgian study site in May 2017. Data concern fruit set and potential pollinator visitation and abundance in the deceptive orchid species Orchis militaris, in relation to orchid density (plot density) and floral display size (number of flowers per inflorescence). Nearest neighbour distance and the number of open flowers per inflorescence during the study period are also given.