Shifting phytoplankton ecological strategies along a continuum of tidewater glacier retreat
Why this work is in the frame
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Bibliographic record
Abstract
Marine-terminating (i.e., tidewater) glaciers are experiencing rapid retreat. Compared to land-terminating glaciers, tidewater glaciers can entrain nutrient-rich deep seawater with buoyant glacial meltwater released at depth from the glacier terminus, fueling summertime primary productivity. We used a continuum of tidewater glaciers at various stages of retreat in the Canadian Arctic Archipelago, in Inuit Nunangat, as a natural laboratory for approximating the impacts of tidewater glacier retreat on marine primary producers and their ecological strategies. We measured phytoplankton community composition and estimated productivity along this retreat continuum and found that phytoplankton communities consist mostly of fast-growing r-strategists such as diatoms at sites with tidewater glaciers likely to be capable of deep-water nutrient upwelling. At sites without tidewater glaciers or those with tidewater glaciers that may have retreated too much to upwell deep-water nutrients, we found communities dominated by small and potentially mixotrophic flagellates, which were indicative of regenerative production and low-nutrient environments. We also observed the highest estimated diatom carbon fixation potential co-occurring with chemical signals of upwelling near a shallow tidewater glacier. These finding suggest that shoaling tidewater glaciers can be important regions of summertime productivity when they can facilitate deep-water nutrient upwelling. However, with continued retreat, tidewater glaciers will cease deep-water upwelling. Low contributions of diatoms at sites with glaciers that no longer induce deep-water upwelling show that tidewater glacier shoaling will ultimately result in reduced ecosystem productivity and shifts towards phytoplankton that employ ecological strategies for success in stratified, nutrient-poor environments, with implications for marine ecosystems adjacent to the >1000 retreating Arctic tidewater glaciers.
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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 | 0.001 | 0.001 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.004 | 0.001 |
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 it