Changing environmental conditions and the response and potential adaptability of freshwater whitefishes
Notice bibliographique
Résumé
Changes in winter conditions, such as increased temperatures and decreased ice coverage, have been observed worldwide. The responses of many lake fish populations to changing winters are projected to be inadequate to counter the speed and magnitude of climate change. Such environmental changes have been hypothesized to explain the low recruitment observed in freshwater whitefishes (Salmonidae Coregoninae). My research focused on measuring the impact changing winter conditions may have on coregonine reproductive phenology and developmental and morphological traits to better predict changes in coregonine populations as a result of climate change. I used experimental incubation methods and modeling to explore how climate-induced changes in water temperature and ice coverage may impact coregonine adults during spawning and early-life stages within and among species. First, I experimentally evaluated the response of embryonic development to increasing water temperature for cisco (Coregonus artedi) from lakes Superior and Ontario, and vendace (C. albula) and European whitefish (C. lavaretus) from Lake Southern Konnevesi, Finland. Embryo survival, incubation duration, and length-at-hatch were inversely related to temperature whereas yolk-sac volume increased with temperature within study groups. However, responses varied in magnitude among study groups suggesting differential levels of developmental plasticity. Next, I quantified how cisco embryos from lakes Superior and Ontario responded to simulated changes in incubation light conditions representing 0-10 (high light), 40-60 (medium light), and 90-100% (low light) ice coverage. Embryo survival was highest under medium light, and light intensity had no effect on incubation duration. Increasing light intensity decreased length-at-hatch in Lake Superior but had no effect in Lake Ontario. Yolk-sac volume was positively correlated with increasing light in Lake Superior and negatively correlated in Lake Ontario. Contrasting responses between lakes suggest populations’ response to light is flexible. Furthermore, I analyzed different embryo incubation temperatures on post-hatching survival, growth, and critical thermal maximum of larval cisco from lakes Superior and Ontario. Larval survival and critical thermal maximum were negatively related to temperature, and larval growth was positively related to temperature. The magnitude of change was greater in Lake Superior than Lake Ontario for all traits examined, suggesting Lake Superior larvae may possess a more limited ability to acclimate to and cope with environmental change. Lastly, I used simulation modeling to investigate changes in reproductive phenology under climatic-warming scenarios for coregonine populations across the Laurentian Great Lakes and Europe. Models predicted that climate-induced increases in water temperatures may cause delayed spawning, shorter embryo incubation lengths, and earlier larval hatching. I quantified how climate change could affect coregonine populations, including changes in embryo development traits, reduced physiological condition of larvae, and shifts in reproductive phenology. Climate-induced responses of coregonines to changing environmental conditions are likely to vary within and among species and with the magnitude of climate warming. Management strategies that maximize phenotypic variability could improve the ability of coregonines to cope with environmental change.
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 | 0,001 | 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 | 0,001 | 0,002 |
| Communication savante | 0,000 | 0,001 |
| Science ouverte | 0,000 | 0,003 |
| Intégrité de la recherche | 0,000 | 0,000 |
| Charge utile insuffisante (le modèle a refusé de juger) | 0,002 | 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 ».