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- Title
Fish growth and degree-days I: selecting a base temperature for a within-population study.
- Authors
Chezik, Kyle A.; Lester, Nigel P.; Venturelli, Paul A.; Tierney, Keith
- Abstract
Degree-days (DD) are an increasingly popular method for explaining variation in fish growth and development. By including a base temperature ( To) the DD formula limits calculations to temperatures that are relevant to growth. However, our review of growth studies shows multiple To values in use for a given fish species. To determine how To affects the ability of DD to explain within-population growth variation, we first show that the ability of DD to describe a growing season is robust to low values of To. We then analyze immature length data from eight species and 85 water bodies in North America to show that there is a broad range of To values that effectively explain growth variation. Based on these results, we argue that precise To estimates are unwarranted for most single-population studies and recommend standard T o values (0, 5, 10, 15 °C). Standardization facilitates comparative studies and promotes the use of DD in future research. To this end, we provide equations for converting annual DD at a given To to annual DD at a standard To.
- Subjects
FISHES; TEMPERATURE; DEGREE days; BIOLOGICAL variation; BODIES of water; COMPARATIVE studies
- Publication
Canadian Journal of Fisheries & Aquatic Sciences, 2014, Vol 71, Issue 1, p47
- ISSN
0706-652X
- Publication type
Article
- DOI
10.1139/cjfas-2013-0295