Distribution and habitat associations of the long-toed salamander (Ambystoma macrodactylum) in the Oldman River Drainage /
Notice bibliographique
Résumé
Long-toed salamanders are designated as Sensitive in Alberta due to their occurrence in patchy, isolated populations, and their vulnerability to habitat destruction or alteration.Three long-toed salamander breeding populations have been identified within the Oldman River drainage: Waterton Lakes National Park, Castle River and Crowsnest.Seven independent long-toed salamander presence/absence surveys occurred in those areas between 1993 and 2002.Numerous field and experimental studies in Western North America have documented long-toed salamander population declines or extirpations due to the presence of non-native trout.In Alberta, stocking of non-native trout into mountain lakes has been a common practice since the early 1900's.Anecdotal evidence indicates that long-toed salamanders and fish rarely co-exist in southwest Alberta waterbodies.The objectives of this study were: 1) to increase knowledge of the distribution of long-toed salamanders in southwest Alberta, 2) to merge data derived from seven independent amphibian surveys in southwest Alberta, and 3) to characterize habitat/occurrence associations for long-toed salamanders in southwest Alberta, focusing on their distribution relative to introduced fishes.Results of a simulated pond experiment that examined the effects of various predators on longtoed salamanders are also presented.Forty-two lakes and ponds were examined for presence/no detection of long-toed salamanders and fish in 2002.Occurrence data collected during other surveys were derived from related reports.Long-toed salamanders were detected at 68 of 135 sites surveyed 1993-2002, at elevations from 1275 m to 2018 m.Thirteen previously unrecorded long-toed salamander breeding locations were documented in 2002.As has been observed in Montana, Idaho and Washington State, trout and long-toed salamanders do not co-exist in wetlands in the Castle and Waterton River drainages.Of the 31 wetlands where long-toed salamanders were observed, 100% lacked trout and 94% lacked minnows.Experimental ponds are commonly used to evaluate variation in amphibian life histories due to predation and competition.The effects of three predators (rainbow trout fry, fathead minnows, and dragonfly larvae) on the survival and growth rate of larval long-toed salamanders were evaluated in a series of 1200 L plastic tanks at the University of Lethbridge.On average, fewer than 10% of larval salamanders survived 30 days in the trout and minnow ponds, whereas between 25-60% of the larvae in control and dragonfly ponds survived.Exposure to minnows reduced the mass of larvae by 34-50% compared to larvae from the other three environments.Results of this ongoing project provide improved understanding of long-toed salamander habitat requirements in southwest Alberta, specifically the effects of non-native fishes on long-toed salamanders.Recommendations include continued long-toed salamander surveys, environmental monitoring, aquatic habitat restoration, and effective management of non-native species.IV '
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Scores du classifieur distillé par catégorie (deux têtes)
| 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 | 0,001 | 0,001 |
| 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) | 0,005 | 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 découleClassification
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Le détail, modèle par modèle et score par score, se trouve en fin de page sous « Comment cette classification a été obtenue ».