A review of agricultural land use by shorebirds with special reference to habitat conservation in the Fraser River Delta, British Columbia
Bibliographic record
Abstract
Many estuaries worldwide are important habitats for shorebirds. Agricultural fields adjacent to food-rich intertidal areas can provide roosting and feeding habitat, particularly at high tide. The Fraser River Delta (FRD) contains rich agricultural land and is Canada’s most important non-breeding site for shorebirds. We review and synthesize recent studies that have investigated agricultural land as non-breeding habitat for shorebirds in the FRD using radio-tracking, day-time and night-time surveys, stable isotope analysis of blood samples, examination of prey in stomach and faecal samples, and farmer surveys regarding field management. The three primary shorebirds studied in the FRD were dunlin (Calidris alpina pacifica), black-bellied plover (Pluvialis squatarola), and killdeer (Charadrius vociferus). Field use is mainly nocturnal for dunlin, but diurnal for black-bellied plovers and killdeer. Dunlin and black-bellied plovers mainly use bare or winter cover crop fields, preferring short cover. Killdeer mainly use berry and winter vegetable fields. All species prefer fields recently manured, fertilized, or laser levelled. Day length and precipitation influenced field use. Stable isotope analysis (δ13C, δ 15N) of dunlin blood indicates that approximately 38% of dunlin diet is obtained from agricultural habitat. Younger birds have a higher terrestrial contribution to diet (~43%) than adults (~35%). Dunlin prey includes agricultural pest species such as leatherjacket (Tipulidae) larvae and wireworm (Agriotes spp.). Coastal agricultural land with diverse crop types benefits shorebirds, and its loss may negatively impact fitness, especially for juveniles. Research conducted in the FRD shows the importance of farmland for wintering shorebirds and suggests conservation and management strategies to preserve and enhance the wildlife value of this agricultural habitat. Key words: Farmland, agricultural land, shorebirds, Fraser River Delta, management, wildlife conservation
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How this classification was reachedexpand
Full frame machine prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. The Gemma side is a direct model label for every work in the frame, read from the title-only record. The Codex side is a classifier learned from the 10,348 direct Codex labels and calibrated to design-weighted sample rates; fields without enough sample support carry no Codex call. Candidate is the union of the two sides; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels.
Distilled classifier scores by category (both heads)
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 0.001 |
| Meta-epidemiology (narrow) | 0.001 | 0.000 |
| Meta-epidemiology (broad) | 0.001 | 0.000 |
| Bibliometrics | 0.006 | 0.011 |
| Science and technology studies | 0.001 | 0.000 |
| Scholarly communication | 0.001 | 0.001 |
| Open science | 0.001 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.005 | 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 itClassification
machine, unvalidatedMachine predicted; a candidate call from one source (direct Gemma or distilled Codex), 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".