适应性温度的可预测性对中华刺参幼鱼生长和耐热性的影响

IF 2.1 3区 生物学 Q4 BIOCHEMISTRY & MOLECULAR BIOLOGY
Cheng Fu, Ke-Ying Zhou, Yue Hu, Yong-Fei Zhang, Shi-Jian Fu
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引用次数: 0

摘要

加热的污水注入、大坝注入的低温下沉水以及极端天气事件都会导致自然水域出现不可预测的温度波动,从而影响鱼类的生长表现和体质。我们假设,与可预测的条件相比,暴露在这种不可预测的波动下的鱼类将表现出较弱的生长能力和更强的耐热性。本研究选择了清波(Spinibarbus sinensis)作为实验对象。将清波分为恒温组(C,22 ± 0.5 °C)、可预测温度波动组(PF,22 ± 4 °C,一天内先升温后降温)和不可预测温度波动组(UF,22 ± 4 °C,升温或降温顺序随机)。经过 40 天的温度适应后,测量了鱼的生长、代谢率、自发活动、热耐受性、血浆皮质醇浓度和肝脏 hsp70 水平。出乎意料的是,与 C 组相比,PF 组和 UF 组的生长速度都没有下降。这可能是因为温度变化并没有导致基本能量消耗的大幅增加。此外,采食量也因温度波动而增加,但差异并不显著。PF组和UF组都表现出更强的上热耐受性,但与C组相比,只有UF组表现出更强的下热耐受性和更高的肝脏hsp70水平。经历过不可预知的温度波动的清波在三组中耐热性最好,这可能是因为它们的 hsp70 表达水平最高。这可能会保护鱼类免受未来极端温度可能造成的致命后果。这些研究结果表明,清波鱼对可预测和不可预测的温度波动都表现出极好的适应性,这可能与其自然栖息地频繁的温度波动有关。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

The effects of the predictability of acclimatory temperature on the growth and thermal tolerance of juvenile Spinibarbus sinensis

The effects of the predictability of acclimatory temperature on the growth and thermal tolerance of juvenile Spinibarbus sinensis

Heated effluent injection, cold hypolimnetic water inputs from dams, and extreme weather events can lead to unpredictable temperature fluctuations in natural waters, impacting fish performance and fitness. We hypothesized that fish exposed to such unpredictable fluctuations would exhibit weaker growth and enhanced thermal tolerance compared to predictable conditions. Qingbo (Spinibarbus sinensis) was selected as the experimental subject in this study. The qingbo were divided into a constant temperature group (C, 22 ± 0.5 °C), a predictable temperature fluctuation group (PF, 22 ± 4 °C, first warming, then cooling within a day) and an unpredictable temperature fluctuation group (UF, 22 ± 4 °C, the order of warming or cooling is random). After 40 days of temperature acclimation, the growth, metabolic rate, spontaneous activity, thermal tolerance, plasma cortisol concentration and liver hsp70 level of the fish were measured. Unexpectedly, neither the PF nor the UF group showed decreased growth compared to the C group. This could be attributed to the fact that temperature variation did not lead to a substantial increase in basic energy expenditure. Furthermore, feeding rates increased due to temperature fluctuations, although the difference was not significant. Both the PF and UF groups exhibited increased upper thermal tolerance, but only the UF group exhibited improved lower thermal tolerance and higher liver hsp70 levels compared to the C group. The qingbo that experienced unpredictable temperature fluctuations had the best thermal tolerance among the 3 groups, which might have occurred because they had the highest level of hsp70 expression. This may safeguard fish against the potential lethal consequences of extreme temperatures in the future. These findings suggested that qingbo exhibited excellent adaptability to both predictable and unpredictable temperature fluctuations, which may be associated with frequent temperature fluctuations in its natural habitat.

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来源期刊
CiteScore
5.00
自引率
4.30%
发文量
155
审稿时长
3 months
期刊介绍: Part A: Molecular & Integrative Physiology of Comparative Biochemistry and Physiology. This journal covers molecular, cellular, integrative, and ecological physiology. Topics include bioenergetics, circulation, development, excretion, ion regulation, endocrinology, neurobiology, nutrition, respiration, and thermal biology. Study on regulatory mechanisms at any level of organization such as signal transduction and cellular interaction and control of behavior are also published.
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