THERMAL ECOLOGY AND SEXUAL SIZE DIMORPHISM IN NORTHERN WATER SNAKES,<i>NERODIA SIPEDON</i>
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Notice bibliographique
Résumé
We used more than 326 000 observations of temperature collected by radio telemetry from 38 individuals over three years to investigate thermoregulation and thermal relations of northern water snakes (Nerodia sipedon) near the northern limit of their distribution in Ontario, Canada. We tested hypotheses concerning the effects of feeding, season, sex, and reproductive condition on thermoregulation of individuals. The mean preferred body temperature (PBT) for captive snakes from the study population was 27.1°C, similar to that reported for other populations, and PBT range (defined as the 25th–75th percentiles of selected temperatures) was 25–30°C. When environmental conditions allowed, the mean and range of body temperature (Tb) of free-living snakes were nearly identical to those observed in captivity. The typical daily pattern in snake Tb was an increase in late morning to a plateau temperature in the preferred range, followed by a decrease in the evening with a nightime plateau at approximately the temperature of the water. We calculated indices of thermoregulation to relate Tb data to available ambient temperatures. Despite the northern latitude of the study population, ambient conditions were favorable over much of the activity season and offered the potential for the snakes to maintain Tb within the PBT range almost 24 h per day for much of the season. However, the thermoregulation indices indicated that N. sipedon are only moderate thermoregulators, and often do not exploit opportunities to achieve PBT, particularly during the day. Variation in annual ambient temperatures affected growth rates of the snakes, and was sufficient to affect the age of maturity of females. Feeding did not elicit a thermophilic response under laboratory conditions or when snakes were fed experimentally in the field, suggesting that the benefits of increasing Tb after eating did not outweigh the costs. Reproductive females thermoregulated more carefully than nonreproductive females during the July–August gestation period. Pregnant females may increase thermoregulatory behavior to enhance the rate and efficiency of embryogenesis. Males thermoregulated less than both reproductive and nonreproductive females, particularly later in the activity season when thermoregulation by females increased. We hypothesized that males pursue a survival strategy following the spring mating season and thus remain cool and secretive during the later part of the activity season. This strategy by males clearly contributes to their slowed growth and smaller size relative to females.
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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 | 0,001 |
| 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) | 0,020 | 0,001 |
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 découle