Diversified but not redundant: Upslope migrating bumble bees restructure pollination services to alpine plants

Climate-induced range shifts lead to novel interactions between resident and migrating species. Understanding the outcomes of such novel interactions can allow for informed predictions of the fates of ecological communities experiencing a warming climate. Long-term studies of ecological communities are rare, limiting our ability to understand how novel interactions under climate change affect community structure and function. Using bumble bee visitation data collected before and after the onset of accelerated anthropogenic global warming, we examined the impact of upslope bumble bee migration on an alpine plant-bumble bee community structure and pollination services. We predicted that an influx of competitors would result in higher pollination services through increased niche partitioning. Contrary to our predictions, our findings reveal a substantial reduction in potential pollination services to historically preferred host plants, despite an increase in resource partitioning by alpine..., , # Diversified but not redundant: Upslope migrating bumble bees restructure pollination services to alpine plants

Dataset DOI: [10.5061/dryad.rr4xgxdkw](10.5061/dryad.rr4xgxdkw)

## Description of the data and file structure

Bumble bee-plant interaction data for two time periods (data collected by Macior in the 1960s and data collected by Miller-Struttmann and colleagues in the 2010s). Additional data on bumble bee tongue lengths, flower corolla/tube depths, and bumble bee corbicular pollen purity is also included.

### Files and variables

#### File: Manuscript_Analyses_VM_NMS_May_2025.Rmd

**Description:** R Markdown file with all analyses used for the *Oikos* publication. 

#### File: Macior_alpine_female_visits.csv

**Description:** Visitation network for alpine bumble bee-plant communities in the 1960s in the Front Range of the Colorado Rocky Mountains. Data from Macior 1974 in *Melanderia*.

##### Variables

* PLANT: plant species
* Columns \"appositus\" to \"suckleyi\": number of *B...,