Climate and catchment influence the postglacial succession of three lakes in south‐central Baffin Island (Nunavut), Canada
Bibliographic record
Abstract
ABSTRACT Understanding postglacial ontogeny in Arctic lakes helps contextualize modern‐day climatic change. We used sediment cores to characterize ecological succession in three south‐central Baffin Island lakes from deglaciation (c. 7–8k cal a BP) to present. Trends in diatom (Bacillariophyceae) and chironomid (Diptera: Chironomidae) assemblages were compared between two small lakes (depth ≤ 12 m, area ≤ 0.04 km 2 ) and the north‐western lagoonal system of Nettilling Lake, the largest freshwater lake in the Canadian Arctic Archipelago (sampling depth = 3 m, total area = 5543 km 2 ). Ecological trajectories differed between the small lakes despite morphological similarities. The northern, lower elevation, small lake showed expected acidification and oligotrophication, while the southern, higher elevation lake experienced hydrologic disturbance likely associated with permafrost degradation. The Nettilling Lake core did not show clear ontogenetic processes, but the high sedimentation rate from approx 6.7 to 5.9k cal a BP (likely from glacial melt) obscured in‐depth analysis of subsequent changes. While the composition of chironomid assemblages varied between lakes, all three lakes showed a minor shift from Tanytarsini to Orthocladiinae taxa over their development, which could reflect ontogenetic changes to resource availability. The different trajectory experienced by each study lake highlights the relevance of catchment properties in structuring lake development.
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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 | 0.001 | 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 | 0.001 | 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".