Environmental limitations of two rare Atlantic Coastal Plain flora species and the impact of hydrological alterations
Bibliographic record
Abstract
Nova Scotia is home to the northern-most disjunct populations of Atlantic Coastal Plain flora species, 11 of which are listed as species at risk by the Committee on the Status of Endangered Wildlife in Canada. This study examined variables that may be limiting the rare elements of this flora in hopes of establishing why they have not expanded to utilize other lakes that appear to be good habitat, including dam reservoir lakes, and how we might alter the management of water levels at reservoir lakes to improve habitat quality there. Two transplant experiments were conducted to examine environmental variables that may be limiting two of the at risk species, Coreopsis rosea Nutt. and Hydrocotyle umbellata L. The first experiment was to determine the effect of growing season length and involved three treatments: time of planting (June, July or August), depth on the shoreline, and water fluctuation regime (three different lakes). The second experiment examined the effect of environmental variables including substrate, vegetation cover, soil moisture, temperature, and water quality. I found that establishment time, flooding, and soil nutrient holding capacity appear to limit both species. The effect of unseasonable flooding was similar to the effect of later establishment in reducing biomass and flowering. Growth and survival were poor under constant flooding. Earlier establishment resulted in slightly higher survival under poor conditions. C. rosea, the upper shoreline specie, though superior in its cold tolerance, had inferior mechanisms for adjusting to flooded conditions in comparison with H. umbellata, the lower shoreline species. At reservoirs, higher fall water levels would prevent cold damage, earlier spring draw down would reduce flood stress, and opening the dam during periods of high precipitation would avoid plant damage due to unseasonable flooding.
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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".