Demographic response of black bears at Cold Lake, Alberta, to the removal of adult males
Bibliographic record
Abstract
Previous reports described an increase in population density following the removal of 23 adult and 3 subadult male black bears (Ursus americanus) from a 218-km2 study area near Cold Lake, Alberta (the CLSA). This finding plays a central role in continuing debates over population regulation in bears, but has been criticized because density estimates were based on assumptions that were not met. Moreover, subsequent discussion has been predicated on conjecture that human exploitation had minimal influence on population dynamics. We used improved methods of markrecapture and survival analysis with a combination of new and previously published data to resolve these issues. Jolly-Seber estimates suggest numbers of females using the CLSA were relatively stable from 1969 to 1971, then more than doubled when males were captured and euthanized during 1971-72. Numbers remained high until 1975, when they declined abruptly. Similarly, numbers of subadult males captured annually increased disproportionately in 1972 and remained high until 1976, when they also declined. Changes in numbers of subadult males captured indicated changes in local density because they were not caused by changes in capture or settling rates. These findings support previous descriptions of trends in bear density at Cold Lake. However, survival records of 56 bears radiomarked during 1974-77 revealed heavier exploitation than previously suspected. Annual mortality rates of radiomarked bears ranged from 14 to 51%, and humans caused at least 25 of 30 observed deaths. Consequently, an underlying assumption of previous interpretations-that the Cold Lake bear population was naturally regulated near carrying capacity-no longer seems reasonable. Our results suggest that adult males deterred bears in other sex-age groups from using the CLSA; however, we found no evidence that birth or death rates were affected. Thus, the observed increase in local density should not be construed as a density-dependent response. Abrupt changes in local density might not have occurred if males had been removed from a larger area encompassing the CLSA.
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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 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.001 | 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".