Ontogenetic development in swimming ability of two species of cold-water marine fish larvae and the role of temperature
Notice bibliographique
Résumé
This study examines the effect of temperature on the development of active swimming ability in the larvae of two cold-water fish species, the pelagic spawner Gadus morhua (Atlantic cod) and the bottom spawner Myoxocephalus scorpius (shorthorn sculpin). The first chapter provides a brief overview of studies on swim speed in larval fishes and how they have been used in studies of dispersal. The second chapter examines the development of critical swimming speed in larvae of the two species reared at different temperatures. These swimming tunnel experiments show that temperature has a clear effect on critical swimming ability of sculpin larvae as they increase in size and age. By contrast, a temperature effect on development of swimming ability in cod larvae was only observed with thermal summation age. Sculpin larvae hatched at a bigger size and stronger swim speed than cod larvae, and also exhibited faster development rate of swimming speed relative to both size and age than cod. The third chapter examines the influence of temperature on development of sustained swimming ability in larvae of the same two species. For sculpin larvae, temperature only has a significant effect on development of sustained swimming ability as a function of absolute age, although sustained swimming speed increased with both age and size. For cod larvae, however, there was a significant temperature effect on development of sustained swimming ability only as a function of size. Cod larval sustained swim speeds lagged behind those of sculpin larvae as a function of age because of the smaller size of cod larvae at hatch. The fourth chapter presents larval transport simulations for Placentia Bay, Newfoundland, in which larvae were initially assumed to be entirely passive and thereby transported exclusively by mean currents. These results were compared to simulations that combined larval active swimming speeds with the influence of mean currents. These simulations, which were conducted for spring and summer temperatures, were then compared to field patterns of larval concentrations from multiple biological surveys in Placentia Bay. The simulations indicated that larvae of bottom-spawning sculpin could take advantage of currents and their strong swimming ability to influence dispersal and improve retention within the embayment, particularly in warmer water temperatures. Larvae of pelagic-spawning cod were almost entirely passive, irrespective of water temperature. Field patterns of cod and sculpin larvae were generally consistent with the simulations, particularly in the context of the active retention simulation for sculpin. This thesis demonstrates that active swimming by larval fish has the potential to significantly influence transport and dispersal, but this potential differs for species and environmental conditions.
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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 | 0,001 | 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 | 0,000 |
| Science ouverte | 0,001 | 0,001 |
| Intégrité de la recherche | 0,000 | 0,001 |
| 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 ».