| Autor: |
McCollum, Artie, Geubtner, Jessica, Hunt von Herbing, Ione |
| Předmět: |
|
| Zdroj: |
ICES Journal of Marine Science / Journal du Conseil; Mar2006, Vol. 63 Issue 2, p335-339, 5p |
| Abstrakt: |
A microcalorimeter that measures total heat output (μW) was used to determine total metabolic rate (aerobic and anaerobic) and the cost of feeding (specific dynamic action, SDA) in larval Atlantic cod (Gadus morhua) from hatching to 4 weeks post-hatch at 10°C. Total heat output increased throughout development from 2.14μW at first-feeding to 23.72μW at 4 weeks post-hatch. SDA was determined by comparing the total heat output among unfed larvae and fed larvae simultaneously. Total heat output increased in the first 2h after feeding with rotifers (Brachionus sp.) and Artemia, remained high for up to 10h, was significantly higher in fed larvae than in unfed larvae, and ranged from 16.56μW at first-feeding to 47.84μW at 4 weeks post-hatch. The differences in total heat output between unfed and fed larvae were 14.42μW and 24.12μW, representing an increase in metabolic cost of feeding by a factor of 1.67 over the first 4 weeks of larval life. That the metabolic cost of feeding increased with development and remained elevated suggests that cod larvae allocate a large part of their energy budget to growth in order to meet the demands of their fast growth rates. [Copyright &y& Elsevier] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
|
