Variable versus constant temperature acclimation regimes: Effects on hemoglobin isomorph profile in goldfish,Carassius auratus |
| |
Authors: | A H Houston Julie H Gingras-Bedard |
| |
Institution: | (1) Department of Biological Sciences, Brock University St. Catherines, Ontario, L2S 3A1, Canada |
| |
Abstract: | Goldfish,Carassius auratus, were acclimated for 2 to 3.5 weeks to three temperature regimes: 1] temporally-constant (10, 20 and 30°C), 2] diurnally-cycling
(20 ± 10°C) and 3] randomly-fluctuating (± 2°C at approximately 2h intervals between extremes of 10 and 30°C). No significant
differences in hematocrit were evident. Hemoglobin levels in fish at constant 30°C and under randomly fluctuating temperature
were significantly elevated. Of the three hemoglobin isomorphs observed, the two minor components (G1, G3) tended to decrease in relative abundance with increase in constant temperature, but increased under varying temperature
regimes. The converse was true of the principal hemoglobin, G2. Extent of isomorph variation was correlated with extent of temperature variability. These observations confirm that temperature
variability significantly effects thermoacclimatory response. The functional significance of changes in isomorph abundances
during the acclimatory process is considered. |
| |
Keywords: | goldfish rainbow trout thermal acclimation hemoglobin isomorphs |
本文献已被 SpringerLink 等数据库收录! |
|