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Effects of seawater acidification on the early development of sea urchin Glyptocidaris crenularis

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Journal of Oceanology and Limnology 2018年第4期36卷 1442-1454页

作者： ZHAN Yaoyao HU Wanbin DUAN Lizhu LIU Minbo ZHANG Weijie CHANG Yaqing Li Cong Key Laboratory of Mariculture ＆ Stock Enhancement in North China＇s Sea Ministry of AgricultureDalian Ocean University Dalian 116023.China College of Basic Medical Science Dalian Medical UniversityDalian 116044China

In this study, we evaluated the effects of CO_2-induced seawater acidification on fertilization, embryogenesis and early larval development in the sea urchin Glyptocidaris crenularis, that inhabits subtidal coastal areas in northern China. The range in seawater p H used in experiments was based on the projections of the Intergovernmental Panel on Climate Change(IPCC), to the year 2100. A natural seawater treatment(p H_(nbs) =7.98±0.03) and three laboratory-controlled acidified treatments(OA_1, ΔpH_(nbs) =-0.3 units; OA_2, ΔpH_(nbs) =-0.4 units; OA_3, ΔpH_(nbs) =-0.5 units) were used in experiments. Results show that:(1) there was a negative effect of seawater acidification on fertilization and on the percentage of abnormal fertilized eggs;(2) the size of early cleavage stage embryos decreased in a dose-dependent manner with decreasing p H;(3) both the hatching rate of blastulae and the survival rate of four-armed pluteus larvae decreased as pH declined;(4) larval abnormalities including asymmetrical development, changes in the length of skeletal elements, and corroded spicules were observed in all seawater acidified-treatments compared with the control. These data indicate that seawater acidification has a negative impact on the early development of G. crenularis, and supports the hypothesis that the response of echinoderms to ocean acidification(OA) varies among species. Further research is required to clarify the specific cellular mechanisms involved.

关键词： seawater acidification Glyptocidaris crenularis early development calcification

Hydrothermal activities and seawater acidification in the Late Devonian F-F transition:Evidence from geochemistry of rare earth elements

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Science China Earth Sciences 2011年第4期54卷 540-549页

作者： ZENG JianWei XU Ran GONG YiMing Key Laboratory of Biogeology and Environmental Geology of Ministry of Education & State Key Laboratory of Geological Processes and Mineral Resources China University of Geosciences Wuhan 430074 China Institute of Resources and Environment Key Laboratory of Biogenic Traces & Sedimentary Minerals of Henan Province Henan Polytechnic University Jiaozuo 454003 China

Rare-earth dements （REE） in limestones were measured by ICP-MS from the Yangdi section across the Frasnian-Famennian （F-F） transition in Guilin, Guangxi of South China. The average EREE contents of measured samples are 33.32 ppm. The average LREE/HREE ratio is 6.35. Data show LREE-enriched REE distribution pattern in the Yangdi section. Most of samples are characterized by positive Eu anomaly with average of 1.13, and there are two maxima of Eu anomaly just below the F-F boundary. Almost all analytical samples show obvious tetrad effects. Remarkable M-shaped tetrad effects are observed in these samples with positive Eu anomaly. The characters of REE and some relative elements （Fe, Mn, Al, etc.） indicate that hydro- thermal activities occurred and resulted in seawater acidification in Upper and Lower Kellwasser horizons of the Late Devonian. The changes of marine environment caused by hydrothermal activities, such as seawater acidification, heavy metal pollution, and eutrophication, would destroy the neritic ecosystem and finally result in the F-F mass extinction.

关键词： Devonian mass extinction REE hydrothermal activities tetrad effects seawater acidification

Comparative study on effects of different seawater acidification scenarios on embryogenesis and larval spicule development of the sea urchin Hemicentrotus pulcherrimus

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Marine Science Bulletin 2018年第1期20卷 21-40页

作者： LI Jia-xiang YANG Meng-yu SUN Jing-xian CUI Dong-yao LI Ying-ying CHANG Ya-qing HU Wan-bin DUAN Li-zhu ZHANG Wei-jie ZHAN Yao-yao Key Laboratory of Mariculture ＆ Stock Enhancement in North China＇s Sea Ministry of AgricultureDalian Ocean UniversityDalian 116023Liaoning provinceChina

To compare the effects of CO2-induced seawater acidification and HCI-induced seawater acidification on benthic echinoderms, Hemicentrotus pulcherrimus inhibiting intertidal coastal zone in northern China was utilized in the current study. Under two seawater acidification scenario conditions, embryogenesis and larval spicule development were investigated and compared, respectively. Based on the projection of IPCC, present natural seawater condition （pH=8.06 ± 0.01） and six laboratory-controlled acidified conditions （three CO2-treated groups and three HCI-treated groups, respectively） were set up. Results showed that：（a） early embryonic cleavage tended to be delayed as pH declined in all acidified seawater groups, embryonic cleavage delay of CO2-treated groups tended to be more severe as compared to that of HCI-treated groups; （b） impaired larval symmetry were observed both in CO2-treated groups and HCI-treated groups, there was no significant difference between the two; （c） alteration in skeletal elements was observed in all acidified groups as compared to control, and elongated spicules were observed in CO2-treated groups and shorten spicules were found in HCI-treated groups. Also, when A pH=-0.5, spicule corrosion in CQ-treated group was worse than that in HCI-treated group. All data observed in this study suggest that different seawater acidification scenarios had different effects on sea urchins. Compared to HCI-induced seawater acidification, the effects of CO2-induced seawater acidification on sea urchins were more profound.

关键词： seawater acidification Hemicentrotus pulcherrimus embryogenesis larvaspicule development