Description:
Investigations of individually tagged Arctic charr from two adjacent regions, the Ungava region of northern Quebec and north Labrador, offered perspectives on growth-temperature relationships for the species. Individual measurements of annual, or within-season growth were determined from tag-recaptured Arctic charr and examined in relation to summer sea surface temperatures and within-season capture timing. Growth of Labrador Arctic charr did not vary significantly among years, however, regional comparisons demonstrated that Ungava charr had significantly higher annual growth rates. Within-season growth rates of Labrador charr did not demonstrate a significant positive association with temperature. However, when individuals were partitioned into experienced temperature intervals, those in the highest temperature grouping (3.5-4°C) had significantly lower growth rates than those experiencing a lower temperature range (1-2.5°C). Growth rates also differed throughout the season, with individuals caught in late June displaying significantly higher growth rates than individuals captured in August. The higher annual growth of Ungava Bay Arctic charr was attributed to the abnormally high temperatures experienced in 2010-11 and the likely associated increase in local nearshore productivity. Results suggest that increases in water temperature may have profound consequences for Arctic charr growth in the Canadian sub-Arctic depending on the responses of local marine productivity to those same temperature increases.
Dépôt source:
Polar Data Catalogue
Éditeur(s):
University of Waterloo
Accès:
Limited
License:
Research programs, CCIN, or ArcticNet take no liability for the use or transmission of this data
URL:
https://www.polardata.ca/pdcsearch/PDCSearchDOI.jsp?doi_id=11254
Date de publication:
2014-01-07
Mots-clés (en):