Environmental change controls postglacial forest dynamics through interspecific differences in life-history traits
Bibliographic record
Abstract
A key goal of functional ecology is identifying relationships between species traits and environmental conditions. Here, the nature and significance of these relationships to community composition on long ecological timescales is investigated using paleoecological and paleoenvironmental data from coastal British Columbia, Canada. RLQ and fourth-corner analyses, two three-table statistical techniques, are used to link traits of the region's dominant woody plants to environmental conditions over the last 15 000 calendar years (cal yr) through a fossil pollen record derived from lake sediments. Both RLQ and fourth-corner analyses revealed highly significant correlations between plant traits and temporal changes in environmental conditions. Axis 1 of the RLQ explained 92% of the total covariance between plant species traits and paleoenvironmental variables and was correlated most strongly with temperature and relative growth rate. In general, climate change during the cold period following deglaciation favored species such as Alnus sinuata and Pinus contorta that exhibit a “fast” life-history strategy (e.g., high relative growth rate, short life span, low shade tolerance), whereas the relative climatic stability of the last 8000 cal yr favored species such as Tsuga heterophylla that exhibit a “slow” life-history strategy (e.g., low relative growth rate, long life span, high shade tolerance). Fourth-corner analyses revealed significant correlations between all paleoenvironmental variables (i.e., temperature, precipitation, summer insolation, vegetation density) and most plant traits (relative growth rate, minimum seed-bearing age, seed mass, height, life span, and shade, drought, and waterlogging tolerances). The strongest correlation was between paleotemperature and height, reflecting the positive effect of temperature on plant growth and development and the overarching competitive advantage that height confers. This research demonstrates that environmental conditions interact significantly with life-history and stress tolerance traits over long ecological timescales to determine forest composition. Climate is the ultimate control on postglacial forest composition and species abundances, but long-term community assembly is also constrained through interspecific differences in plant traits.
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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 | 0.001 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.001 | 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) | 0.348 | 0.002 |
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".