A record of holocene environmental change from the Pleasant River Fen complex, Southwest Nova Scotia
Bibliographic record
Abstract
Wetlands in Nova Scotia provide habitat for several rare, disjunct species, most notably the Blanding's turtle. The survival of these species may be dependent on the stability of these environments. As well, wetlands constitute an important terrestrial sink for carbon. A decrease in productivity or change in groundwater regime will affect this sink and a net release of greenhouse gases could result. In our study we are attempting to reconstruct Holocene environmental change in the Pleasant River Fen, in particular Late Holocene (Neoglacial) cooling. The Pleasant River Fen is located in southwestern Nova Scotia near Kejimkujik National Park. Sediment depth was measured by probe and sonar, and was highly variable (> 6m) and dominantly organic. A 4 m long vibracore sample was analyzed for lithostratigraphic proxies including loss on ignition (LOI) and magnetic susceptibility (MS). Wood at the base of the core provided an AMS date of 9060 +/- 70¹⁴C yr BP. MS values were consistently low indicating low clastic influx. LOI values varied with depth however values in excess of 60% occurred near the base of the core. A transition in lithostratigraphic properties at 126 cm depth (~4000¹⁴C yr BP) is coincident with the onset of modern moist cool climate as recorded in other records. The lithostratigraphic transition appears to represent a shift to a wetter environment possibly associated with a rising water table. The upper 40 cm of the core (300 BP — Present) exhibits much lithostratigraphic variability which appears related to human activity (fire, water level management) in the region. The results of this study indicate the Pleasant River Fen has evolved significantly in response to past environmental change. Future climate change has the potential to further modify this environment.
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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 | 0.001 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.018 | 0.006 |
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; both teacher heads agree on what is shown here.
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".