Life history, morphometric and habitat use variation in arctic charr (Salvelinus alpinus) populations of southern Baffin Island, Nunavut, Canada
Notice bibliographique
Résumé
Arctic charr (Salvelinus alpinus) are known to be phenotypically plastic throughout their range and exist as land-locked, lake-resident and migrant morphotypes.The focus of my study was to compare two morphs of charr (initially classified as smali- and large-mature) that co-exist seasonally in three open lake systems of Baffin Island, Nunavut, Canada.Specifically I identifred differences between the two morphotypes within each lake studied via morphological comparisons and habitat use (Chapter 2) and life history characters (Chapter 3).Results indicate that maximum otolith Sr level and the range of otolith Sr are statistically significant in lakes LH001 and PG082 between small-maturing and large-maturing groups.No statistical significance was observed for the maximum otolith Sr level and the range of otolith Sr in lake PG015.A component of each charr population within lakes LH001 and PG082 is migratory (large-maturing charr) whereas another component is lake-resident (small-maturing chan).In lake PGO15 there is evidence to suggest that small-mature charr are utilising inter-tidal habitats.Four morphological characters were identif,red as different in lakes LH001 and PG082 between small-maturing and undeveloped groups (immature and small resting individuals): eye diameter, pectoral fin length, pelvic fin length and upper jaw length.Four morphological characters were identified as different in lake PG0i5: eye diameter, pectoral fin length, pelvic fin length and fork depth.Univariate tests of the morphological characters showed statistically signif,rcant differences between the maturity types with the exception of eye diameter in lake PGO15 and upper jaw length and pelvic fin in iake LH001.The clear morphological variation observed between small-maturing and undeveloped fish in all three lakes of the study suggests ecological niche specialisation.Within all3 lakes 1l studied small-mature charr appear to have body form and structural characteristics that suggest lake-residency whereas large-mature charr have body form and structural characters that suggest anadromy.The lake-resident charr had larger fin lengths which are functionally better for manoeuvring in complex habitats (i.e.darting between rocks).The anadromous charr had short fin lengths which are functionally better for swimming long distances.Life history characters were variable amongst the two morphs firrther referred to as lake-resident and anadromous morphs.Anadromous charr within all lakes of the study had a mean size at maturity that ranged from 532 mm to 641mm and mean age of maturity that ranged from i0 to 13 years.In comparison, lake-resident charr had a mean size that ranged from 184 mm to 202 mm and a mean age at maturity that ranged from 8 to 9 years.The relationship between body size and fecundity or egg diameter did not differ between the two morphs.The von Bertalanffy growth model indicated that overall growth of both lake-resident and anadromous char was significantly different in all three lakes studied.Specifically, lake-resident charr initially had growth rates that were double that of anadromous charr.The results of our study parallel what is observed in general salmonid life histories but differ from some current Ernopean studies of Arctic charr growth.These studies suggest that juvenile stage lake-resident charr growth is slow and juvenile stage migrant charr growth is fast. ACKNO\ilLEDGEMENTSThanks to my advisor Darren Gillis for his abilities to point
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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 ».