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引用次数: 0
摘要
代谢率是鱼类能量收支的一个关键参数,它强烈影响生物能量模型的输出。在这项研究中,我们验证了1岁大口黑鲈Micropterus nigricans (Cuvier, 1828)的代谢率随生长历史变化的假设。两组鱼交替饲喂1820年黑头鲦鱼(Pimephales promelas Rafinesque, 1820)维持或随意饲料,在9周的时间内,鱼的初始和最终尺寸相似。9周后,用静态闭式呼吸仪测量耗氧量。尽管两组鱼的最终体重相似(平均值为104-108 g),但维持饲料的比耗氧量(0.094 mg O 2 g−2 h−1)比自由饲料的比耗氧量(0.152 mg O 2 g−2 h−1)少38%。食物消耗的生物能量估计值与观察到的自由饲料鱼的值相似(误差约7%),但对于维持饲料鱼,该模型高估了65%的食物消耗。通过考虑由于摄食减少而引起的代谢率变化,减少了模型估计食物消耗的误差。这些发现为生物能量学模型中与消耗依赖误差相关的因素提供了新的见解,并强调了饲养历史对鱼类代谢率的重要性。将生长依赖性代谢纳入生物能量学模型可以提高模型的准确性,并允许渔业生物学家对鱼类生长和能量学做出更明智的决定。
Effect of feeding history on metabolic rate of largemouth bass (Micropterus nigricans): implications for bioenergetics models
Metabolic rate is a key parameter in fish energy budgets that strongly influences the output of bioenergetics models. In this study, we tested the hypothesis that metabolic rate varies with growth history of age-1 largemouth bass Micropterus nigricans Cuvier, 1828. Two groups of fish were fed alternating maintenance or ad libitum rations of fathead minnow Pimephales promelas Rafinesque, 1820, so that over a 9-week period, initial and ending size of fish was similar. After 9 weeks, oxygen consumption was measured using static, closed respirometry. Although final body weight was similar between the two groups (means, 104–108 g), specific oxygen consumption for fish fed maintenance rations (0.094 mg O 2 g −2 h −1 ) was 38% less than that measured for fish fed ad libitum (0.152 mg O 2 g −2 h −1 ). Bioenergetics estimates of food consumption were similar to observed values for fish fed ad libitum (∼7% error), but for fish fed maintenance rations, the model overestimated food consumption by 65%. By accounting for changes in metabolic rate owing to reduced feeding, error in model estimates of food consumption was reduced. These findings shed new insight into factors associated with consumption-dependent error in bioenergetics models and highlight the importance of feeding history on metabolic rate of fish. Incorporating growth-dependent metabolism into bioenergetics models can improve model accuracy and allow fisheries biologists to make more informed decisions regarding fish growth and energetics.
期刊介绍:
Published since 1929, the Canadian Journal of Zoology is a monthly journal that reports on primary research contributed by respected international scientists in the broad field of zoology, including behaviour, biochemistry and physiology, developmental biology, ecology, genetics, morphology and ultrastructure, parasitology and pathology, and systematics and evolution. It also invites experts to submit review articles on topics of current interest.