COEXISTENCE AND SPATIAL DISTRIBUTIONS OF MARBLED MURRELETS (<i>BRACHYRAMPHUS MARMORATUS</i>) AND OTHER ALCIDS OFF SOUTHWEST VANCOUVER ISLAND, BRITISH COLUMBIA
Bibliographic record
Abstract
Niche overlap and resource partitioning have seldom been investigated in the marine habitats of seabirds but are obvious determinants of community and population status. We investigated interspecific differences in densities and spatial aggregations of seabirds during summer (June–August) off southwest Vancouver Island, British Columbia. Two 300-m-wide parallel transects were sampled along 66.6 km of shoreline in 1993–1996, centered 200 m and 600 m from shore. Analysis focused on the threatened Marbled Murrelet (Brachyramphus marmoratus) and three other fish-eating alcids. Densities of Marbled Murrelets were among the highest reported at sea in the species' range; they were concentrated close to shore (>75% within 0.6 km and virtually all within 2.0 km of shore), usually in water <20 m deep, and showed strong fidelity to certain sectors along the coast from year to year. Common Murres (Uria aalge) and Rhinoceros Auklets (Cerorhinca monocerata) were not as closely associated with nearshore habitat as Marbled Murrelets, and their longshore distribution also differed from that of the latter. Neighbor-K analysis showed that Marbled Murrelets were usually segregated from Common Murres and, to a lesser extent, from Rhinoceros Auklets, but the latter two species were usually aggregated together. Marbled Murrelets also left the area after breeding, whereas numbers of Common Murres and Rhinoceros Auklets increased from June through August. Pigeon Guillemots (Cepphus columba) showed variable distributions and no consistent associations with other alcids. Marine distributions of Marbled Murrelets were markedly different from those of other fish-eating alcids, and we discuss this in relation to possible interference competition from the larger Common Murres and Rhinoceros Auklets. Coexistence et répartitions spatiales de Brachyramphus marmoratus et autres alcidés au sud-ouest de l'île de Vancouver, en Colombie Britannique
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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 | 0.001 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.002 | 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".