A REVIEW OF ROOK STATUS, WITH NEW SOUTH PEMBROKESHIRE DATA, 1986 - 1996
Notice bibliographique
Résumé
The rook population of southern Pembrokeshire was surveyed using nest counts during two breeding seasons, ten years apart (1986 and 1996). The results were compared over the study period, and analysed with reference to published data for this and other regions. The rookeries were non-randomly distributed, mainly on mixed farmland with limestone soils. Changes in the numbers of rook nests through time were variable within the study area, ranging from nest increases of over 30% in the south-west (Dale, Angle and Castlemartin), to decreases of 47% in the south-east of the county. The average size of rookeries was stable in the south, increased in the west, and decreased in the east. The overall size distribution of rookeries did not alter much between 1986 and 1996, and was similar to that seen in Pembrokeshire in 1975. The number of individual rookeries decreased by as much as 53%, except on the Castlemartin peninsula where an increase of 38% was noted. Overall, there was a slight decrease in total rook nest numbers of about 7% between the two south Pembrokeshire surveys. In contrast, at the national (UK) level, there were estimated increases of about 7% between 1975 and 1980. Subsequent national increases ranging from 5% to 14% were suggested by a combination of results of the Common Birds Census (CBC) and the Breeding Bird Survey (BBS), over the period 1986-1998. A national census in 1996 recorded an increase of about 40% (UK) and 36% (Wales) since 1975. Although parts of south Pembrokeshire have followed these national trends, the general trends there over the last 25 years have been declines between 1971 and 1975, and between 1986 and 1996, with an intervening period (1975-1980) of from 10 to 44% increase. South Pembrokeshire thus appears to be rather uncoupled from the UK trends in rook status, as has been noted for other common resident birds. The BBS report (1999) for the first time showed data between 1994-1998 separately for Wales and Scotland, and indicated a 7% decline in Welsh rooks and a 65% increase in Scotland. Bearing in mind the periods between previous full surveys (20 30 years), the strong regional variations, and the decline of many farmland species, it is recommended that more regular rook surveys be carried out at national level, and that local and regional surveys be better co-ordinated during intervening years.
Récupéré en direct depuis OpenAlex et désinversé. Les résumés ne sont pas conservés dans cette base de données : les index inversés représentent 8,6 Go des 9,3 Go de texte de la base, et le serveur dispose de 13 Go libres.
Comment cette classification a été obtenuedéplier
Prédiction machine sur la base complète
Imitation des enseignantsNi prévalence calibrée, ni vérité terrain. Validation humaine à venir. Le volet Gemma est une étiquette directe du modèle pour chaque travail de la base, lue sur la notice réduite au titre. Le volet Codex est un classifieur appris des 10 348 étiquettes directes de Codex et calibré sur les taux pondérés de l'échantillon; les champs sans appui suffisant ne portent aucun appel Codex. Le mode candidate est l'union des deux volets; le consensus est leur intersection. Ces sorties portent le statut machine_predicted_unvalidated et ne sont pas des étiquettes humaines.
Scores du classifieur distillé par catégorie (deux têtes)
| Catégorie | Codex | Gemma |
|---|---|---|
| Métarecherche | 0,002 | 0,006 |
| Méta-épidémiologie (sens strict) | 0,001 | 0,001 |
| Méta-épidémiologie (sens large) | 0,002 | 0,001 |
| Bibliométrie | 0,008 | 0,014 |
| Études des sciences et des technologies | 0,000 | 0,000 |
| Communication savante | 0,001 | 0,001 |
| Science ouverte | 0,001 | 0,001 |
| Intégrité de la recherche | 0,000 | 0,000 |
| Charge utile insuffisante (le modèle a refusé de juger) | 0,004 | 0,001 |
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 source (Gemma direct ou Codex distillé), 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 ».