Orchid fruiting success is unrelated to surrounding floral resources in South Australian plant communities

To maintain recruitment in orchid populations in an ecosystem setting, we must understand how surrounding floral resources affect fruiting success. We studied fruiting success in two endemic Australian species, Diruis pardina and Glossodia major, in relation to surrounding floral resources. Diuris pardina has a visually deceptive pollination strategy via mimicry of pea flowers, attracting pollinators associated with co-flowering plants of Pultenaea. Glossodia major displays dummy anthers and has a more generalist pollination strategy. We expected fruit set of both species to positively correlate to conspecific and heterospecific floral density because orchid pollination should be enhanced by the attraction of higher densities of bees. We expected fruiting success of D. pardina to positively correlate with abundance of Pultenaea flowers. Surveying 18 plots in South Australia, we counted species, individuals and flowers of conspecifics and heterospecifics and returned to count flowers that set fruit. We conducted Pearson correlations between fruiting success and density of conspecific flowers, richness, abundance and Shannon index of surrounding floral resources and floral abundance of individual species. Fruiting success was correlated with conspecific floral density for Diuris pardina but not G. major. No relationship was found between fruiting success and heterospecific floral resources. Fruiting success of D. pardina was not correlated with abundance of Pultenaea; instead it was positively correlated with the invasive species Lavandula stoechas.

Mapping bee flora in honey producing areas of the Alto Médio Canindé microregion in Piauí state, Brazil

The Brazilian state of Piauí is one of the largest producers of organic honey in the country. Although the product is made from nectar collected from natural vegetation, including several species endemic to the Caatinga, knowledge of the beekeeping potential of semiarid vegetation remains scarce, particularly in Piauí. As such, the present study aimed to map the flora of honey-producing areas of the Alto Médio microregion in Piauí. A survey was conducted of apiaries in the region and bee production in four beekeeping communities, using data provided by the Simplício Mendes Microregion Beekeeping Cooperative (COMAPI). Geographic coordinates were used to generate a map to analyze vegetation in the region and excursions were carried out in previously defined areas to survey plants visited by honeybees. The beekeeping communities in areas with greater floral density had the highest honey production. Forty plant species were collected, with the most representative family being Fabaceae, followed by Euphorbiaceae and Anacardiaceae. Most of the plants surveyed were visited by bees with the sole purpose of collecting nectar and were flowering in months with the highest honey production. Thus, creating a flowering calendar could help beekeepers make better use of the local flora.

Surveying insect flower visitors to crops in New Zealand and Australia

The survey of insect flower visitors to crops dependent on their pollination is an essential component in determining their effectiveness as pollinators. In most cases, different survey techniques are required for different crops because of variation in planting design, floral density, spatial distribution of flowers or where additional factors such as the variation in plant vigour are being explored. Here we provide survey techniques that have been, or are currently being employed to survey flower visitors across different crops in New Zealand and Australia. Future studies may consider the use of similar designs that will allow for increased standardisation within and between locations and studies. This will provide opportunities for improved direct comparisons between studies, and the ability to combine data sets to address broader spatial-scale questions regarding insect pollination.