The Influence Of Fish Behaviour On Search Strategies Of Common Murres Uria Aalgein The Northwest Atlantic
Notice bibliographique
Résumé
Although distribution patterns of seabirds at sea have been described for decades, it remains difficult to identify the mechanisms underlying these patterns.For instance, researchers focusing on prey dispersion as the primary determinant of seabird distribution have found high variability in the spatial overlap of bird and prey aggregations, partially due to the scale-dependent nature of such associations.We conducted a study to identify how the behaviour of capelin Mallotus villosus, the primary prey species of all vertebrate predators in the Northwest Atlantic, influences the search tactics of Common Murres Uria aalge while acting as central-place foragers during chick-rearing.The study was conducted from 1998-2002 on and around Funk Island, the largest colony of murres in eastern Canada (~ 400 000 breeding pairs), situated on the northeast coast of Newfoundland.We made direct measurements of (1) the distribution, abundance and spatial and temporal persistence of capelin aggregations within the foraging range from the colony (~ 100 km) in combination with (2) bio-physical habitat characteristics associated with capelin aggregations, and (3) individual-and population-level arrival and departure behaviour of murres from the colony.During July of 2000, capelin were found to be persistently abundant within specific 2.25 km blocks of transect ("hotspots").Further study revealed that capelin persisted in hotspots due to bio-physical characteristics suitable for demersal spawning and for staging areas and foraging areas prior to and after spawning.Directions of return and departure flights of murres measured from the colony did not match during the same observation period (~ 1h), indicating that murres departing the colony did not use information on prey distribution provided by the flight paths of flocks returning to the colony (Information Center Hypothesis).Specific commuting routes (regular flight paths) of murres toward and away from capelin hotspots, however, were obvious at sea, and feeding murres consistently marked the location of these hotspots.This provided excellent conditions for murres to locate capelin from memory and by cueing to activities of conspecifics (local enhancement).Hotspots were persistent across years in this region, presumably allowing marine predators to learn the locations of hotspots, resulting in the use of traditional feeding grounds through generations.Hotspots of predators and prey promote energy transfer among trophic levels, a key ecosystem process.Human predators also concentrate fishing activities within these areas and, thus, there is a need to identify hotspots for protection.Persistent hotspots would be particularly amenable to the design of marine protected areas defined by the habitats of marine predators and their prey.
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 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) | 0,000 | 0,000 |
| Bibliométrie | 0,000 | 0,000 |
| Études des sciences et des technologies | 0,000 | 0,001 |
| Communication savante | 0,000 | 0,000 |
| Science ouverte | 0,000 | 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 ».