Home range, habitat selection, and annual survival of little brown bats (Myotis lucifugus) in central Canada
Notice bibliographique
Résumé
The little brown bat (Myotis lucifugus) is one of several hibernating bat species in North America affected by a fungal pathogen that causes a disease known as White-nose syndrome (WNS). As a result, little brown bat populations have experienced massive declines, resulting in federal and provincial efforts to conserve the species. However, limited knowledge about space requirements and long-term survival rates may be limiting the effectiveness of management efforts. In my thesis I fill gaps in the scientific literature to provide information on which conservation efforts can use to incorporate more species-specific information and base quantitative objectives on. In my first data chapter, I determine how energetic demands associated with reproduction and WNS affect home range and habitat selection. Reproductive bats must balance high daily energetic costs to support pregnancy and milk production, requiring large home ranges. However, energy and time constraints associated with reproductive activities, such as juvenile care, may restrict the space that they can use. I tested two competing hypotheses to determine which of the two, time or energetic constraints, ultimately affect home range size during pregnancy and lactation. I used radiotelemetry to quantify night-time home ranges of reproductive female little brown bats from a WNS-positive maternity colony. Results indicated that lactating females used smaller home ranges than pregnant bats, suggesting that time constraints drive variation in space use among individuals. In my second data chapter, I estimate annual survival rates in two populations of little brown bats near the northern limit of the species’ range. I used seven years (2011-2017) of mark-recapture data for 4932 individual little brown bats to test the hypothesis that demographic characteristics, such as sex and age, along with seasonal environmental factors, affect variation in annual survival of little brown bats. At both hibernacula, annual survival varied over time with both age and sex of bats but did not vary with either summer or winter climatic variables. Male survival was generally higher than female survival and young-of-the-year survival was lower than that of adults. These results indicate that demography, and not environmental conditions influence inter-annual survival rates at my study sites. The results from this chapter suggest that females and juveniles are vulnerable groups in these populations. As a general management plan, conservation efforts should target female and juvenile demographic groups for protection, likely at maternity colonies where they are found at high densities during the summer. Taken together these results fill crucial knowledge gaps and provide critical baseline information on which management efforts can be based.
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 ».