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菲律宾蛤仔慢、快速生长幼体的清除率和代谢率的热依赖性。

Thermal dependence of clearance and metabolic rates in slow- and fast-growing spats of manila clam Ruditapes philippinarum.

机构信息

Departamento GAFFA (Animal Physiology), Facultad de Ciencia y Tecnología, Universidad del País Vasco/Euskal Herriko Unibertsitatea, Apartado 644, 48080, Bilbao, Spain,

出版信息

J Comp Physiol B. 2013 Oct;183(7):893-904. doi: 10.1007/s00360-013-0764-1. Epub 2013 May 22.

Abstract

Thermal dependence of clearance rate (CR: l h(-1)), standard (SMR: J h(-1)) and routine metabolic rates (RMR: J h(-1)), were analyzed in fast (F)- and slow (S)-growing juveniles of the clam Ruditapes philippinarum. Physiological rates were measured at the maintenance temperature (17 °C), and compared with measurements performed at 10 and 24 °C after 16 h and 14 days to analyze acute and acclimated responses, respectively. Metabolic rates (both RMR and SMR) differed significantly between F and S seeds, irrespective of temperature. Mass-specific CRs were not different for F and S seeds but were significantly higher in F clams for rates standardized according to allometric size-scaling rules. Acute thermal dependency of CR was equal for F and S clams: mean Q 10 were ≈3 and 2 in temperature ranges of 10-17 and 17-24 °C, respectively. CR did not change after 2 weeks of acclimation to temperatures. Acute thermal effects on SMR were similar in both groups (Q 10 ≈ 1 and 1.6 in temperature ranges of 10-17 and 17-24 °C, respectively). Large differences between groups were found in the acute thermal dependence of RMR: Q 10 in F clams (≈1.2 and 1.9 at temperature ranges of 10-17 and 17-24 °C, respectively) were similar to those found for SMR (Q 10 = 1.0 and 1.7). In contrast, RMR of S clams exhibited maximum thermal dependence (Q 10 = 3.1) at 10-17 °C and become depressed at higher temperatures (Q 10 = 0.9 at 17-24 °C). A recovery of RMR in S clams was recorded upon acclimation to 24 °C. Contrasting metabolic patterns between fast and slow growers are interpreted as a consequence of differential thermal sensitivity of the fraction of metabolism associated to food processing and assimilation.

摘要

我们分析了快速(F)和慢速(S)生长的菲律宾蛤仔稚贝的清除率(CR:lh(-1))、标准代谢率(SMR:Jh(-1))和常规代谢率(RMR:Jh(-1))的温度依赖性。在维持温度(17°C)下测量生理速率,并与在 10°C 和 24°C 下分别测量 16 小时和 14 天后进行比较,以分别分析急性和驯化反应。代谢率(RMR 和 SMR)在 F 和 S 种子之间存在显著差异,而与温度无关。根据体尺比例规则标准化的 F 和 S 种子的比代谢率(SMR)没有差异,但 F 蛤的比代谢率(SMR)显著更高。CR 的急性温度依赖性在 F 和 S 蛤中相等:在 10-17°C 和 17-24°C 的温度范围内,平均 Q 10 分别约为 3 和 2。适应温度 2 周后,CR 没有变化。两组 SMR 的急性热效应相似(在 10-17°C 和 17-24°C 的温度范围内,Q 10 分别约为 1 和 1.6)。在 RMR 的急性温度依赖性方面,两组之间存在很大差异:F 蛤的 Q 10(在 10-17°C 和 17-24°C 的温度范围内分别为 1.2 和 1.9)与 SMR 的 Q 10 相似(Q 10=1.0 和 1.7)。相比之下,S 蛤的 RMR 在 10-17°C 时表现出最大的温度依赖性(Q 10=3.1),而在较高温度下则受到抑制(在 17-24°C 时 Q 10=0.9)。S 蛤在适应 24°C 时记录到 RMR 的恢复。快速和慢速生长者之间代谢模式的对比被解释为与食物加工和同化相关的代谢部分的热敏感性差异的结果。

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