More Rapid Wear of Bands on Common Goldeneye Than on White-winged Scoter
Notice bibliographique
Résumé
ult female Common Goldeneyes, (Bucephala clanqula), recaptured in nest boxes at the University of Saskatchewan Field Station at Emma Lake, Saskatchewan, have shown evidence of unusually rapid band wear.From 44 banded adult females recaptured in June of subsequent years, seven have carried bands so thin that the numbers were barely visible.In spite of the unpleasant extra work entailed in band schedule reporting of rebanded birds, these bands were replaced.Only in 1985 did we weigh the badly worn bands removed from 3 of 8 recaptured females, all having been banded as adults.The weight of bands 786-38175 and 786-38174, placed in June 1980, was 510.7 mg and 581.2 mg, and that of 786-38174, placed in June 1980, was 510.7 mg and 581.2 mg, and that of 786-38190, placed in June 1982, was 584.7 mg.Unfortunately reference archive bands of the same size 6 series were unavailable from the Bird Banding Laboratory.On their advice, we took the mean weight of three unused bands, 836-90929, 930 and 931, weighing respectively 862.9 mg, 861.0 mg and 857.6 mg, as roughly representative of the weight of the 786-series.From this we calculated the rate of wear for the three goldeneye bands, yielding weight losses of 41% and 32% for the 5-year-old bands and 32% for the 3-year-old band.The annual weight losses from this small sample of size 6 bands are respectively 8.2%, 6.4% and 10.7% per year, with a mean of 8.4%.wear on larger bands, but may also depend on where the bird winters; although Hatch and Nisbet expected, as we did, to find more rapid wear in salt water, bands from inland tern colonies wore more rapidly than those from coastal colonies.In handling 79 recaptured White-winged Scoters, Melanitta fusca, at Redberry Lake, Saskatchewan, we have found a much lower rate of wear in size 7A bands.All 36 scoters recaptured in 1985, up to 16 years after banding, carried well preserved bands, but an adult female dead on her nest that year carried a thin band, 1037-81316, place in 1977, weighing only 1.13 g.In addition, in 1984, 2 of 43 adult female scoters recaught on their nests carried bands that were unduly thin and were replaced.Band 577-29704, placed on an adult female scoter in 1972, weighed 1.19 g at recapture; 1007-88847, placed in 1976, weighed 1.13 g.Unworn bands from the same series weighed 1.49, 1.49 and 1.50 g.Annual rates, for these selected individuals demonstrating band wear, were only 1.7%, 3.0%, and 3.5%.
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Comment cette classification a été obtenuedéplier
Prédiction distillée sur la base complète
Imitation des enseignantsNi prévalence calibrée, ni vérité terrain. Validation humaine à venir. Apprise à partir de 10 348 étiquettes directes de Codex et de 10 348 étiquettes directes de Gemma. Le mode candidate est l'union des têtes enseignantes seuillées; le consensus est leur intersection. Ces sorties portent le statut machine_predicted_unvalidated et ne sont ni des étiquettes humaines ni des étiquettes directes de modèles de pointe.
Scores Codex et Gemma par catégorie
| Catégorie | Codex | Gemma |
|---|---|---|
| Métarecherche | 0,000 | 0,000 |
| Méta-épidémiologie (sens strict) | 0,000 | 0,000 |
| Méta-épidémiologie (sens large) | 0,001 | 0,000 |
| Bibliométrie | 0,001 | 0,001 |
| Études des sciences et des technologies | 0,000 | 0,001 |
| Communication savante | 0,000 | 0,001 |
| Science ouverte | 0,001 | 0,000 |
| Intégrité de la recherche | 0,000 | 0,000 |
| Charge utile insuffisante (le modèle a refusé de juger) | 0,000 | 0,000 |
Scores machine (provisoires)
Les deux têtes enseignantes du modèle étudiant, lues sur ce travail. Un score ordonne la base pour la relecture; il n'affirme jamais une catégorie, et le statut de validation accompagne chaque rangée tel quel.
Scores de référence d'un modèle non mature (critères de maturité non atteints, 7 itérations). Un score ordonne; il n'affirme jamais une catégorie.
score_only:v0-immature-baseline · tel quel depuis la passe de notation : score_only signifie que le nombre peut ordonner les travaux, et qu'aucune étiquette de catégorie n'en découleClassification
machine, non validéePrédiction automatique; un appel candidat d’une seule tête enseignante, pas un consensus.
Le détail, modèle par modèle et score par score, se trouve en fin de page sous « Comment cette classification a été obtenue ».