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为了揭示不同温度条件下运动和摄食对细鳞鲑幼鱼代谢模式的影响,在饱和溶氧(>8.0 mg·L-1)条件下,分别测定了空腹组和摄食组在5个处理温度(4、8、12、16和20℃)下的运动前代谢率(MO2p)、活跃代谢率(MO2a)、代谢范围(MS)、临界游泳速度(UC)以及10个流速水平下的实时游泳代谢率(MR).结果表明:在各个温度条件下,摄食组的MO2p和MO2a均显著高于空腹组(P<0.05),且分别提高了15%和12%(4℃)、47%和23%(8℃)、30%和21%(12℃)、43%和36%(16℃)及8%和7%(20℃);摄食组与空腹组的UC和MS均无显著性差异(P>0.05),但随着温度升高,两组的MS均呈现下降趋势;随流速的增加,各组的游泳代谢率呈先升高后降低的变化规律,且摄食组显著大于空腹组(P<0.05),各组的最大代谢率峰值均出现在低于UC的流速条件下;在细鳞鲑幼鱼的游泳速度接近70%UC的运动过程中,其代谢率不断增大至峰值,随后在游泳速度达到UC的过程中,代谢率呈下降趋势.表明在一定温度范围条件下,细鳞鲑幼鱼的最大代谢率是由运动与摄食共同诱导产生的,在达到最大代谢率峰值的过程中代谢表现为添加模式;之后随游泳代谢率的下降,摄食诱导的代谢率被削减,该过程表现为运动优先代谢模式.
In order to reveal the effects of exercise and food intake on the metabolism patterns of saimiri juveniles under different temperature conditions, the effects of dietary exposure to 5 treatment temperatures ( (MO2p), metabolic rate (MS), critical swimming speed (UC), and real-time swimming metabolism at 10 flow rates at 4, 8, 12, 16 and 20 ° C (MR) .The results showed that the MO2p and MO2a of the feeding group were significantly higher than those of the fasting group (P <0.05) under the conditions of 15% and 12% (4 ℃), 47% and 23% respectively (8 ℃), 30% and 21% (12 ℃), 43% and 36% (16 ℃) and 8% and 7% (20 ℃) respectively. There was no significant difference between UC and MS in feeding group and fasting group (P> 0.05). However, with the increase of temperature, the MS of both groups showed a downward trend. With the increase of flow rate, the swimming metabolic rate of each group increased first and then decreased, and the feeding group was significantly larger than the fasting group (P <0.05). The peak value of maximum metabolic rate in each group appeared under the condition of flow rate lower than that of UC. The metabolic rate increased continuously to the peak value when swimming speed of 70% UC rats , Then the swimming speed reached UC too During the process, the metabolic rate showed a downward trend, indicating that under a certain temperature range, the maximum metabolic rate of the fish was induced by exercise and food intake, and reached the maximum metabolic rate in the process of metabolic performance as a mode of addition ; Then with the decline of swimming metabolic rate, food-induced metabolic rate is reduced, the process showed the movement-preferred metabolic model.