Augmentation of an Agricultural Pollinator Hedgerow for Habitat and Climate Change

Abstract

Habitat loss is the leading cause of declining native pollinator populations, raising serious concerns over the reduction in ecosystem services critical to global ecosystems and agriculture. Native plant hedgerows within agricultural landscapes are a solution that provides habitat for insects and increases crop productivity in surrounding areas. This project focuses on enhancing an existing hedgerow at Metchosin Farm in Victoria, BC with the goals of improving forage and overwintering habitat for native pollinators while increasing resiliency to the projected future climate conditions. Modified line intercept surveys, pollinator surveys, ground inspections, and a literature review of climate models were used to assess the characteristics of the hedgerow and anticipate the future site conditions. Insights from these findings informed the selection of native plants adapted to dry soils and tolerant of drought conditions. Significant invasive species removal and sheet mulching was completed in preparation for new plants, along with the installation of several structures that provide nesting and overwintering opportunities for pollinators. Across the work zones, 100% of the invasive species were removed in a first pass, 16 new native plant species were added, increasing species richness by 35%. The hedgerow’s bloom period now extends into September, lengthening the foraging window for pollinators. Over the duration of the project, three volunteer events supported community engagement and highlighted the importance of native pollinators in agricultural systems. The installation of new plants and nesting structures in one zone of the hedgerow also provides the farm with a “demonstration” hedgerow for future educational and workshop opportunities. Ongoing monitoring and maintenance of invasive species will be required to prevent competition with the new plantings and we encourage Metchosin Farm to pursue a Bee Friendly Farming certification to highlight the pollinator supportive practices already in place.