Addled by antlers: Synchronous disruption to female caribou antler phenology
Notice bibliographique
Résumé
Abstract Caribou are the only deer species in which females also grow antlers; however, female antler phenology differs from males. While males grow antlers over summer and hold them through autumn rut, female caribou grow antlers in summer and carry the polished antlers through winter until parturition. The pathways associated with antler casting in females are thought to be related to hormonal changes during parturition. Yet not every female caribou is pregnant every year, and nonpregnant individuals must use an alternative cue to trigger antler casting. While populations are typically consistent in antler phenology there are observations of individual caribou on an alternate phenological timeline, casting antlers 1 month prior to parturition, and growing velvety antlers a few inches long during the calving time. Indeed, this is generally observed in barren females and only in small proportions of the population. Here we report on observations of a population‐wide change in antler phenology on Fogo Island, Newfoundland. We observed several individuals growing velvety antlers during calving season, earlier than in previous years, including two individuals who were confirmed to have been pregnant. Additionally, we observed no female caribou with polished antlers from the previous autumn, when our field observations generally show ~20% of the adult female caribou in this population have antlers at this time. We discuss possible disruptions to this phenology, commenting specifically on environmental cues that differed in comparison to years with the more commonly observed phenology. We found evidence suggesting that years with early antler casting had earlier spring warming, as well as earlier reduction in snow cover when compared to previous years. Our observations suggest that changing climate patterns may impact antler growth in female caribou, causing growth to coincide with the increased nutritional and energetic demands associated with gestation and lactation. Specifically, it is possible that earlier warming patterns may change which cue triggers antler growth in pregnant individuals from a hormonal cue during pregnancy to an environmental cue more commonly used by barren individuals. We highlight potential research questions surrounding the resilience of antler phenology, and the potential fitness consequences of disruptions to antler growth.
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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) | 0,018 | 0,005 |
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; les deux têtes enseignantes s’accordent sur ce qui est montré ici.
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