Germination Response of the Freshwater Invasive Iris pseudacorus to Brackish and Marine Salinity as Well as Implications for Coastal Invasion
Bibliographic record
Abstract
Abstract Conventionally considered a freshwater species, evidence indicates that yellow flag iris (Iris pseudacorus) tolerates saline conditions. As a water-dispersed species, clarifying how I. pseudacorus seeds respond to seawater immersion is critical to understanding marine dispersal and invasion risk for coastal habitat. Using seeds from marine and freshwater I. pseudacorus populations, we assessed how the duration of immersion (15, 30, 60, and 90 days) in varying salinities (0, 13–15, 33–35 practical salinity units) affected the germination response of seeds, and whether immersion in freshwater following saline exposure impacted germination success or seed viability. Freshwater-produced seeds consistently outperformed those produced by plants persisting in marine conditions. Neither salinity concentration nor duration of immersion had a statistically significant impact on germination success. Exposure to saline conditions fully inhibited germination unless seeds received a freshwater recovery. Seed coat thickness was statistically significantly greater among the freshwater population, but there was no discernible difference in mean seed weight. Seeds from both populations remained viable following prolonged exposure to salinity. We posit that observed differences in germination between the two populations may arise from dormancy mechanisms rather than seed fitness. Overall, our results suggest that I. pseudacorus has the capacity to disperse vast distances through the marine environment, potentially habitat-hopping to reach ecosystems characterized by freshwater input, such as estuaries or saltmarshes. Management efforts should target early detection of the species in freshwater-enriched coastal habitats and react rapidly to remove individuals before they become established.
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How this classification was reachedexpand
Full frame machine prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. The Gemma side is a direct model label for every work in the frame, read from the title-only record. The Codex side is a classifier learned from the 10,348 direct Codex labels and calibrated to design-weighted sample rates; fields without enough sample support carry no Codex call. Candidate is the union of the two sides; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels.
Distilled classifier scores by category (both heads)
| 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) | 0.002 | 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 source (direct Gemma or distilled Codex), 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".