Success and failure of Cyzenis albicans in controlling its host the winter moth
Notice bibliographique
Résumé
Situations in which the parasitic fly Cyzenis albicans appears to control numbers of its host the winter moth, were compared with situations where it does not. Comparisons were made by field observation and experimentation during the first four years of winter moth decline following introduction of C. albicans and Agirypon flaveolatum in Victoria, British Columbia, Canada. Successful control of winter moth on oaks was compared with failure on apple trees. Phenology of winter moth development differs on the two tree species, giving rise to potential asynchrony between host and parasite on apple trees. Difference in the degree of asynchrony on the two tree species does not, however, result in a difference in level of parasitism of winter moth. Aggregative attack by Cyzenis, in response to host density, occurs when winter moth are on oaks, but is absent when winter moth are on apple. Difference in pattern of attack did not result in difference in mortality from parasitism at high density but did so at low density. The manipulation of predatory beetle abundance by as much as 100-fold did not affect the magnitude of mortality of winter moth, and affected mortality of the parasitoid only slightly. Large, density-dependent mortality of Cyzenis in the soil did not preclude their increase to high density, and hence would not affect the impact of Cyzenis on winter moth densities. The magnitude and degree of density-dependence of winter moth pupal mortality in the soil (regardless of beetle abundance) suggests that mortality of this stage, rather than parasitism of larvae by introduced parasites, has caused population decline in both British Columbia and Nova Scotia. The factor causing most mortality in the soil in British Columbia appears to be pathogens. Suggested mechanism for the increase in soil mortality during the four years of study are: (1) introduction of and/or increased pathogen transmission via Cyzenis or (2) activation of latent infection by density-induced stress of the host. This study implicates factors other than parasitism by introduced parasitoids in the suppression of winter moth numbers. Correlation between degree of aggregation in response to host density and degree of successful control, however, supports the claim that parasitoids can stabilize host populations at low density.
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 | 0,000 |
| 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 ».