Non-native plants in road verges attract pollinators despite associated declines in native flowers
Bibliographic record
Abstract
Marginal habitats are increasingly recognized for their potential value in pollinator conservation. Road verges, which cover extensive areas, provide abundant floral resources and contribute to habitat heterogeneity and connectivity in homogeneous landscapes. However, road verges are also hotspots for the establishment and dispersal of non-native plants, raising doubts on their suitability to support diverse pollinator populations. We sampled flowering plants and visiting insects in roadsides of southeastern Manitoba, Canada, and leveraged datasets of bee communities from surrounding areas and Wildlife Management Areas (WMAs) to compare pollinator communities across habitats. Plant communities in road verges were dominated by a subset of abundant non-native species and were disproportionately visited by generalist pollinators. Non-native plant abundance was negatively correlated with native plant richness and abundance in the verges but positively associated with bee richness and abundance. Landscape context and scale also influenced pollinators. We found strong differences in pollinator richness, abundance, and community composition at larger (ecozone) scales, with local landscape composition and configuration also contributing significantly, albeit to a lesser extent. Road verge bee communities were distinct and less even than those in surrounding areas and WMAs, and exhibited a markedly higher proportion of polylectic to oligolectic individuals. These findings suggest that road verges can support generalist pollinators but are less suitable for specialists, highlighting their potential to maintain pollination services in heavily disturbed or densely-forested landscapes while also revealing limitations in harboring representatively diverse and even communities. • Road verges act as habitat for many pollinator species in a variety of landscapes. • Non-native flowering plants in road verges are negatively associated with native plants. • Road verges host uneven pollinator communities dominated by generalist bee species. • Road verges may help preserve pollination services in disturbed landscapes by supporting generalist bee populations.
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How this classification was reachedexpand
Full frame distilled prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. Learned from the 10,348 direct Codex labels and 10,348 direct Gemma labels. Candidate is the union of thresholded teacher heads; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels or direct frontier model labels.
Codex and Gemma teacher scores by category
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.000 | 0.000 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from itClassification
machine, unvalidatedMachine predicted; a candidate call from one teacher head, not a consensus.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".