Recruitment of Atlantic cod to Newfoundland coastal waters at \ndaily and seasonal scales
Notice bibliographique
Résumé
Recruitment of marine fish is influenced by abiotic and biotic processes operating \nat many spatial and temporal scales. Recruitment level was thought to be set during the \nlarval stages but recent evidence suggests that year-class strength can be modified during \nthe early juvenile stages. Annual recruitment has received much attention but variation at \nfiner temporal scales may affect biological processes that influence year-class success. I \ntested the hypothesis that timing of recruitment of fish from the plankton to nearshore \nbenthic areas is determined by water mass movements. I also tested whether seasonal \nrecruitment of fish to near shore bottom habitats was associated with prey availability and \ngrowth rates of post-recruited fish. Seining was conducted daily at one location during \n2002 and biweekly at 12 sites during 1998-2002 to monitor fish densities and arrival \ntimes nearshore. I found that daily recruitment of Atlantic cod (Gadus morhua ), \nGreenland cod (Gadus ogac) and hake (Urophycis tenuis) to sites on the northeast coast \nof Newfoundland was associated with onshore winds following upwelling. Results were \nconsistent with larval transport onshore during downwelling. Recruitment of Atlantic cod, \nGreenland cod and hake to the nearshore was not associated with tidal stage. The \nphenology of Atlantic cod recruitment to near shore benthic habitats appears simple but \nseasonal growth rates are more complex. During July to November of2000 to 2002, the \nmonthly pattern of abundance of newly-recruited Atlantic cod near shore was similar to \nseasonal patterns of zooplankton abundance that I observed near shore. Seasonal \nzooplankton abundances near shore were similar to those previously reported offshore . \nNewly-recruited Atlantic cod were relatively abundant during September and October of \n2000-2002. During these months, growth rates of post-recruited fish were also relatively \nhigh. However, I found growth rates of post-recruitment fish were comparatively high \ntwice annually with highest growth occurring during June and October. During both of \nthese months water temperatures were near optimum for growth and the ratio of Atlantic \ncod abundance to zooplankton abundance near shore was similar. Abundance of newlyrecruited \nAtlantic cod near shore was relatively high during May of 2002 when growth \nrates offish were low, contrary to prediction. Monthly abundance of newly-recruited \nAtlantic cod near shore was more closely associated with the amount of zooplankton that \nfish could utilize at observed water temperatures rather than total abundance of \nzooplankton. At daily scales, recruitment of Atlantic cod near shore was found to be \ndetermined by physical processes but both abiotic and biotic processes were important at \nseasonal scales.
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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 | 0,000 | 0,001 |
| 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 | 0,001 |
| Intégrité de la recherche | 0,000 | 0,000 |
| Charge utile insuffisante (le modèle a refusé de juger) | 0,001 | 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 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 ».