Spatial Variability of the Dominant Climate Signal in <i>Cassiope tetragona</i> from Sites in Arctic Canada
Bibliographic record
Abstract
<span style="font-family: 'Times New Roman'; color: #221e1f;">Our study investigates the nature of the climate signal in three populations of the Arctic dwarf-shrub <em>Cassiope tetragona </em>using dendrochronological and stable isotope analysis techniques. We present 15 new <em>C. tetragona </em>chronologies from three sites (Axel Heiberg, Bathurst, and Devon islands) in the eastern Canadian Arctic, of which three are the first continuous stable carbon isotope ratio (δ¹³C) time series developed for Arctic shrubs. Correlation and multivariate regression analyses revealed that multiple and different climate factors influenced the chronologies within and between the three sites. At the Axel Heiberg Island site, the dominant climatic influences over annual stem elongation were previous year (t-1) and current year (t) summer precipitation, while annual production of flower buds was influenced by (t) winter precipitation and spring temperature. At Bathurst Island, annual production of flower buds responded to (t-1) growing season sunshine hours and winter precipitation and to (t) late growing season temperature and moisture availability. Our analysis of the Axel </span><span style="font-family: 'Times New Roman'; color: black;">H</span><span style="font-family: 'Times New Roman'; color: #221e1f;">eiberg and Bathurst Island models revealed the positive influence on δ</span><span style="font-family: 'Times New Roman'; color: #221e1f;">13</span><span style="font-family: 'Times New Roman'; color: #221e1f;">C values of (t-1) winter temperature—and on </span><span style="font-family: 'Times New Roman'; color: black;">B</span><span style="font-family: 'Times New Roman'; color: #221e1f;">athurst Island only, of (t-1) spring sunshine hours. The combined influence of these parameters on spring moisture availability suggests that the δ</span><span style="font-family: 'Times New Roman'; color: #221e1f;">13</span><span style="font-family: 'Times New Roman'; color: #221e1f;">C ratios varied in response to stomatal conductance. At Devon Island, the δ</span><span style="font-family: 'Times New Roman'; color: #221e1f;">13</span><span style="font-family: 'Times New Roman'; color: #221e1f;">C values varied in response to (t) and (t-1) spring and summer temperature and spring and fall solar radiation, which in turn influence the rate of photosynthesis. Our study supports the emerging hypothesis that Arctic shrubs are sensitive to climate. </span><span style="font-family: 'Times New Roman'; color: black;">H</span><span style="font-family: 'Times New Roman'; color: #221e1f;">owever, strong spatial variation in plant-climate response characterized our sampling sites. </span><span style="font-family: 'Times New Roman'; color: black;">T</span><span style="font-family: 'Times New Roman'; color: #221e1f;">his variation may be linked to site sensitivity, or regional climate variability due to geographic and topographic differences, or both. </span>
Fetched live from OpenAlex and de-inverted. Abstracts are not stored in this database: the inverted indexes are 8.6 GB of the frame’s 9.3 GB of text, and the host has 13 GB free.
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 | 0.001 |
| 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) | 0.003 | 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".