Migration and growth potential of coho salmon smolts: implications for ecological impacts from growth‐enhanced fish
Notice bibliographique
Résumé
Wild-genotype and growth hormone (GH) transgenic coho salmon (with dramatically enhanced growth potential) were used to examine the influence of genotype, age, body size, growth, and rearing conditions on the onset of seaward migration and to assess the potential consequences of the introduction of such transgenic fish on natural ecosystems and wild populations. When reared from the first feeding stage under naturalized stream conditions, there was no difference in survival or migratory timing between the two genotypes. However, larger fish migrated earlier in the season than smaller fish of both genotypes, and transgenic fish with higher specific spring growth rates migrated earlier in the season than slower-growing transgenic fish. Stream-reared fish of both genotypes also displayed increased migratory activity at dawn and dusk. Fish reared in the hatchery for 3 and 15 months before being released into the stream in August differed in onset of seaward migration due mainly to age (older fish migrated earlier in the season) and genotype (transgenic fish migrated before wild-type in younger fish). Further, hatchery-reared fish showed no diel pattern in activity during migration. In older fish, larger individuals migrated later in the season than small individuals, whereas there was no clear size effect in younger individuals. Thus, although small differences in spring migration timing were observed among groups, seaward migration in coho salmon was largely independent of major shifts in size and growth rate induced by GH transgenesis (i.e., transgenic fish migrated at approximately the normal time in the spring, rather than at the typical size). Further, early rearing conditions had a stronger effect on migratory behavior than did the growth-promoting transgene. Taking into account effects of migratory timing, growth, survival, and differential food conversion efficiencies, these data suggest that transgenic fish escaped from hatcheries would have a greater impact on stream ecosystems during early life compared to escaped wild-type fish. However, this difference may be reduced if rearing occurred in subsequent generations under wild conditions where growth rates of transgenic fish are reduced compared with hatchery conditions.
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 ».