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Effects of Elevated Temperature and Food Supply on the Termination of Over-Summering and Subsequent Development of the Calanoid Copepod Calanus sinicus: Morphology Physiology and Gene Expression

机译:高温和食物供应对终止过度盛衰和随后的Calanoid copepod Calanus sinicus发育的影响:形态生理和基因表达

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摘要

The copepod Calanus sinicus Brodsky dominates the zooplankton in the Yellow Sea, China, and undergoes over-summering within the Yellow Sea Cold Water Mass (YSCWM). Termination of over-summering and subsequent development are regarded as key processes in population recruitment, and are probably linked to environmental variations in the YSCWM. In this study, we examined the effects of temperature (9 and 18°C) and food conditions (0.1 μg C mL-1 and unfed) on metabolic rates, morphological characteristics, and relative gene expressions of six genes involved in molting, gonad development, lipid catabolism, and stress tolerance processes of C. sinicus during termination of over-summering and subsequent development. Both elevated temperature and external food supply rapidly ended over-summering of C. sinicus, accompanied by up-regulation of the ecdysteroid receptor (EcR) gene expression and increased metabolic rates. These environmental conditions resulted in irreversible termination of over-summering and ensure the success of molting. During subsequent development, the lipid reserve in oil sacs could permit only early gonad development. The food supply might be a trigger to activate the final maturity of gonad by up-regulating expression of the vitellogenin receptor (VgR) gene. Thus, food played an indispensable role in population recruitment after termination of over-summering, whereas the elevated temperature accelerated these physiological processes. This study revealed the first dynamic profiles of physiological processes involved in over-summering termination and the subsequent development of C. sinicus using morphological, physiological and molecular methods simultaneously, confirmed the quiescent state of over-summering C5 copepodites, detected the effects of environmental changes on over-summering termination and subsequent development, and provided a foundation for future investigations of the mechanisms involved in over-summering in YSCWM.
机译:pe足类中华螯虾(Calanus sinicus Brodsky)在中国黄海的浮游动物中占主导地位,并在黄海冷水团(YSCWM)内过度繁殖。终止过度消费和随后的发展被视为人口募集的关键过程,并且可能与YSCWM中的环境变化有关。在这项研究中,我们研究了温度(9和18°C)和食物条件(0.1μgC mL -1 和未进食)对六种代谢率,形态特征和相关基因表达的影响过度盛夏和后续发育终止过程中参与中华绒毛线虫蜕皮,性腺发育,脂质分解代谢和胁迫耐受过程的基因。升高的温度和外部食物供应都迅速结束了中华假丝酵母的过度消费,伴随着蜕皮甾类受体(EcR)基因表达的上调和新陈代谢率的提高。这些环境条件导致了过度消费的不可逆转的终止,并确保了蜕皮的成功。在随后的发育过程中,油囊中的脂质储备可能仅允许性腺的早期发育。食物供应可能是通过上调卵黄蛋白原受体(VgR)基因表达来激活性腺最终成熟的触发因素。因此,食物在过度消费结束后对人口募集起着不可或缺的作用,而高温则加速了这些生理过程。这项研究揭示了过度消灭终止的最初生理过程的动态过程,以及同时使用形态学,生理学和分子生物学方法对中华绒螯蟹进行后续发育的过程,证实了过度摄取的C5 pe足类动物的静止状态,检测了环境变化的影响关于过度消费终止和后续开发的信息,并为将来调查YSCWM过度消费所涉及的机制提供了基础。

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  • 年(卷),期 -1(11),9
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  • 总页数 22
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