海水酸化及升温对刺参稚参生长和变色的影响

海洋酸化和海洋变暖是当下及未来海洋生物及其依存生态系统面临的主要环境压力和生态问题。当前,海洋生物早期发育气候变化生物学的研究主要集中于海洋酸化的影响,为了更好地探究海洋气候变化对海洋生物的影响,有必要研究海洋酸化和变暖联合作用下海洋生物的生态响应。以受精后24天的刺参稚参为研究对象,通过模拟当前和本世纪末海洋环境,观察海水酸化和升温对刺参稚参在体色发育关键时期生长、发育及体色变化的影响。实验设置对照组(大连近海水温,pCO₂ 400 mg·kg^-1)、升温组(对照组水温+2℃,pCO₂ 400 mg·kg^-1)、酸化组(对照组水温,pCO₂ 1000 mg·kg^-1)、酸化升温组(对照组水温+2℃,pCO₂ 1000 mg·kg^-1)。结果表明:温度升高2℃能够显著提高稚参发育速率,体色变化加快; pH值降低0.23个单位显著延迟稚参生长,体色变化减缓,个体间体重差异变大;升温2℃能抵消pH降低0.23个单位对...

Effects of seawater acidification and warming on growth and pigmentation in juvenile sea cucumber Apostichopus japonicus

Ocean acidification and warming are the main environmental pressures and ecological problems faced by marine organisms and their dependent ecosystems at present and in the future.However,the research on the early development of marine organisms mainly focused on the impact of ocean acidification.To better understand the impacts of climate change on marine organisms,it is necessary to study the responses of marine organisms under the joint effect of ocean acidification and warming.We conducted an experiment with juvenile sea cucumber(Apostichopus japonicus)to examine the impacts of seawater acidification and warming on growth,development,and body pigmentation in key stage of body pigmentation by simulating current seawater condition and that at the end of this century.Four treatments were set up:control group(seawater temperature of the Dalian coast,pCO2400 mg·kg^-1),seawater warming group(control group temperature plus 2℃,pCO2400 mg·kg^-1),seawater acidification group(control group temperature,pCO21000 mg·kg^-1),and combined seawater warming and acidification group(control group temperature plus 2℃,pCO21000 mg·kg^-1).The results showed that a pH decrease of 0.23 units delayed growth,slowed pigmentation,and increased variation of body weight among individuals.In contrast,a 2℃temperature increase accelerated growth and pigmentation of the juveniles,potentially neutralizing the negative effects of pH decrease.Our results indicated that juvenile sea cucumbers can gradually adapt to long-term seawater acidification and warming.