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Marine Life Science & Technology 2023年第4期5卷 455-466页

作者： Sujian Tan Pin Huan Baozhong Liu CAS and Shandong Province Key Laboratory of Experimental Marine Biology Institute of OceanologyChinese Academy of SciencesQingdao 266071China Laboratory for Marine Biology and Biotechnology Laoshan LaboratoryQingdao 266237China

The D-quadrant organizer sets up the dorsal–ventral(DV)axis and regulates mesodermal development of spiralians.Studies have revealed an important role of mitogen-activated protein kinase(MAPK)signaling in organizer function,but the related molecules have not been fully revealed.The association between fibroblast growth factor receptor(FGFR)and MAPK signaling in regulating organizer specification has been established in the annelid Owenia fusiformis.Now,comparable studies in other spiralian phyla are required to decipher whether this organizer-inducing function of FGFR is prevalent in Spiralia.Here,we indicate that treatment with the FGFR inhibitor SU5402 resulted in deficiency of organizer specification in the mollusk Lottia peitaihoensis.Subsequently,the bone morphogenetic protein(BMP)signaling gradient and DV patterning were disrupted,suggesting the roles of FGFR in regulating organizer function.Changes in multiple aspects of organizer function(the morphology of vegetal blastomeres,BMP signaling gradient,expression of DV patterning markers,etc.)indicate that these developmental functions have different sensitivities to FGFR/MAPK signaling.Our results reveal a functional role of FGFR in organizer specification as well as DV patterning of Lottia embryos,which expands our knowledge of spiralian organizers.

关键词： FGF signaling Organizer speciﬁcation BMP signaling gradient DV patterning mollusk

Preliminary study of mollusk fossils in the Qinan Miocene loess-soil sequence in western Chinese Loess Plateau

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Science China Earth Sciences 2006年第7期49卷 724-730页

作者： Denis-Didier Rousseau Université Montpellier II Institut des Sciences de l’Evolution (UMR CNRS 5554) Case 61 Place E. Bataillon 34095 Mont-pellier Cedex 05 France Lamont-Doherty Earth Observatory of Columbia University Palisades New York 10964 USA

The first near continuous mollusk fossil record from the Qinan Miocene loess-soil se-quence is presented. Results show that mollusk species are abundant in the QA-I section between 22 and 6.2 Ma, and both loess layers and soil layers yield mollusk fossil individuals. All mollusk species are terrestrial and well preserved in the section. Most species are identical to those identified in the Quaternary loess-soil sequence of the Loess Plateau. The thermo-humidiphilous group generally is distributed in soil layers, whereas cold-aridiphilous group can be observed in loess layers. From the Miocene to Quaternary, the occurrence and divergence of new species of Metodontia and Cathaica correspond to the crucial periods of regional and global environmental changes, indicating that mol-lusk species are sensitive to environmental variations. Preliminary study on the QA-I mollusk record indicates that the Qinan Miocene loess-soil sequence may have a similar sedimentary environment to the Quaternary loess-soil sequence of the Loess Plateau.

关键词： mollusk fossils, Miocene loess, Loess Plateau, mollusk evolution, sedimentary environment.

Response of mollusk assemblages from the Luochuan loess section to orbital forcing since the last 250 ka

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Chinese Science Bulletin 2000年第17期45卷 1617-1622页

作者： D.D.Rousseau Laboratoire de Palynologie-URA 327 University Montpellier Ⅱ 34095 Montpellier France

This note presents a new result of terrestrial mollusk study from the Luochuan loesssection since the last 250 ka. A total of 213 samples, taken at intervals of 10 cm in the S0-L3 portion, were analyzed for fossil mollusks. Generally, 150-600 individuals were counted in each sample. According to the distribution of mollusk fossil assemblages in the loess section, 11 mollusk fossil zones have been recognized, representing different climatic and ecological conditions. Three main ecological groups were identified according to the temperature and moisture requirements of each taxon. The cold-aridiphilous group shows maxima at about 240-220, 190-182, 150-140 and 74 -66 ka BP. The thermo-humidiphilous set has high abundances for at least 6 times in the section at about 246-240, 220-216, 170-158, 92-86, 60-44 and 10 kaBP. Our results show that variations in mollusk ecological groups are related with changes in the Earth orbital parameters at the 41 and 20 ka frequencies. Maxima in thermo-humidiphilous taxa

关键词： mollusk assemblage loess orbital forcing.

Taxonomical and Biogeochemical Investigation of Elements in Holocene mollusk Shells in the South and Southwestern Marmara Basin,Turkey

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Acta Geologica Sinica(English Edition) 2008年第6期82卷 1160-1167页

作者： Saday Azadoglu ALIYEV Ali SARI Bahadir KTEN Ankara University Faculty of EngineeringDepartment of Geological Engineering06100 TandoganAnkaraTurkey

Concentrations of some heavy metals and trace elements such as Cr, Ga, Ni, Zn, Mo, Cu, Pb, Yb, Y, Nb, Ti, Sr, Ba, Mn, Sc, Co, V, Zr, Fe, Al, W, Se, Bi, Sb, As, Cd in recent mollusk shells and factors affecting their distribution and deposits collected from various depths in the southern and southwestern parts of the Marmara Sea are investigated. The distribution of the elements in the shells is categorized into four groups. Of these, concentrations of 12 elements （As, Bi, Cd, Co, Ga, Mo, Nb, Sb, Se, Sc, W and Yb） are below zero [（0.053-0.79）×10^-6]; concentrations of seven elements （Cr, Ni, Pb, V, Y, Zr and Cu） are （1.0-6.0）×10^-6; concentrations of four elements （Ti, Mn, Ba and Zn） are 10- 20×10^-6; and concentrations of five elements （Si, Al, Fe, Mg and Sr） are （47.44-268.11）×10^-6. The taxonomic characteristics of the 29 elements were studied separately in mollusk shells such as Chamalea gallina （Linn6）, Pitar rudis （Poli）, Nassarius reticulatus （Linn6）, Venerupis senescens （Coocconi）, Mytilus galloprovincialis （Lamarck）, Mytilaster lineatus （Gemelin in Linne） and Chlamys glabra. It was found that, in mollusk taxonomy, the elements have unique values. In other words, element concentrations in various mollusk shells depend mainly on the taxonomic characteristics of mollusks. In various bionomic environments different element distributions of the same species are attributed to the different geochemical characters of the each environment. Data obtained in this study indicate that the organisms are the most active and deterministic factors of the environment.

关键词： biogenic biogeochemistry fauna element lattice mollusk taxonomy Turkey

Climatic instability recorded by the mollusk assemblages from the late glacial loess deposits in China

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Chinese Science Bulletin 1999年第13期44卷 1238-1242页

作者： Naiqin Wu D. D. Rousseau Dongsheng Liu Chinese Acad Sci Inst Geol Beijing 100029 Peoples R China Univ Montpellier 2 URA 327 Palynol Lab F-34095 Montpellier 5 France

The loess-paleosol sequence in China records abundant and valuable information on the global and regional climate changes. Biological record from the loess sequence is the most direct evidence on variation in pattern of paleo-atmospheric circulation and changes in winter and summer monsoon. A new record of climatic instability, which occurred in the Loess Plateau during the late glacial period, is presented. Through the study of terrestrial mollusks from three loess sequences, the authors intend to characterize the biological response process to rapid climate change and to learn the mechanisms driving the instable climate changes and the possible linkage in different regions. The result shows the striking consistent variability in the ratio records of three mollusk sequences of the late glacial, indicating apparent rapid climate fluctuations. Correlation of our three mollusk records with the oxygen isotopic records from Greenland ice cores and foraminiferal records from the Northeast Pacific Ocean

关键词： mollusk assemblages loess deposits late glacial period.

Molecular response and developmental speculations in metamorphosis of the veined rapa whelk,Rapana venosa

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Integrative Zoology 2023年第3期18卷 506-517页

作者： Pu SHI Hao SONG Jie FENG Meijie YANG Zhenglin YU Zhi HU Cong ZHOU Haizhou LI Tao ZHANG CAS Key Laboratory of Marine Ecology and Environmental Sciences Institute of OceanologyChinese Academy of SciencesQingdaoChina Laboratory for Marine Ecology and Environmental Science Qingdao National Laboratory for Marine Science and TechnologyQingdaoChina Center for Ocean Mega-Science Chinese Academy of SciencesQingdaoChina CAS Engineering Laboratory for Marine Ranching Institute of OceanologyChinese Academy of SciencesQingdaoChina University of Chinese Academy of Sciences BeijingChina Shandong Province Key Laboratory of Experimental Marine Biology QingdaoChina FuHan Ocean Technology Co. LtdHaiyangChina

Metamorphosis is the short developmental stage characterized by dramatic ontogenetic changes that occurs in most animals.However,this important process remains largely unclear in marine invertebrates.In this study,we performed the sequential RNA sequencing of a representative mollusk,the rapa whelk(Rapana venosa),that is undergoing metamorphosis and conducted differential gene expression analysis and weighted gene co-expression network analysis(WGCNA)to investigate the overall and dynamic transcriptome responses.The results revealed that the expression of cytochrome P4502A and 3A were upregulated during metamorphosis,while the expression of H/ACA ribonucleoproteins increased 4 h after metamorphosis induction(M4 stage),indicating that R.venosa mainly responded to the pelagobenthic changes.At the M24 stage,the enrichment of V-type proton ATPase and insulin indicated the complete development of secretory organs and initiation of hormone secretion.Furthermore,at the M48 stage,the enrichment of zinc metalloproteinase and conotoxin indicated a well-developed predation system that requires exogenous nutrition.Finally,during the PL stage,the genes associated with growth control were highly enriched,implying that R.venosa had completed metamorphosis and has entered the period of rapid growth.Therefore,our study provides useful transcriptomic resources for R.venosa and contributes new insights that may assist in elucidating the mechanisms underlying metamorphosis in marine invertebrates.

关键词： metamorphosis mollusk rapa whelk transcriptomics

Comparative analysis of the cardiac structure and transcriptome of scallop and snail,perspectives on heart chamber evolution

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Marine Life Science & Technology 2023年第4期5卷 478-491页

作者： Meina Lu Rabia Hayat Xuejiao Zhang Yaqi Jiao Jianyun Huang Yifan Huangfu Mingcan Jiang Jieyi Fu Qingqiu Jiang Yaojia Gu Shi Wang Alexander A.Akerberg Ying Su Long Zhao Key Laboratory of Evolution and Marine Biodiversity(Ministry of Education)and Institute of Evolution and Marine Biodiversity Ocean University of ChinaQingdao 266003China College of Marine Life Sciences Ocean University of ChinaQingdao 266003China College of Fisheries Ocean University of ChinaQingdao 266003China Fang Zongxi Centre for Marine EvoDevo and MOE Key Laboratory of Marine Genetics and Breeding College of Marine Life SciencesOcean University of ChinaQingdao 266003China Division of Basic and Translational Cardiovascular Research Department of CardiologyBoston Children’s HospitalBostonMA 02115USA Harvard Medical School BostonMA 02115USA

The evolution of a two-chambered heart,with an atrium and a ventricle,has improved heart function in both deuterostomes(vertebrates)and some protostomes(invertebrates).Although studies have examined the unique structure and function of these two chambers,molecular comparisons are few and limited to vertebrates.Here,we focus on the two-chambered protostome heart of the mollusks,offering data that may provide a better understanding of heart evolution.Specifically,we asked if the atrium and ventricle differ at the molecular level in the mollusk heart.To do so,we examined two very different species,the giant African land snail(Lissachatina fulica)and the relatively small,aquatic yesso scallop(Mizuhopecten yessoensis),with the assumption that if they exhibited commonality these similarities would likely reflect those across the phylum.We found that,although the hearts of these two species differed histologically,their cardiac gene function enrichments were similar,as revealed by transcriptomic analysis.Furthermore,the atrium and ventricle in each species had distinct gene function clusters,suggesting an evolutionary differentiation of cardiac chambers in mollusks.Finally,to explore the relationship between vertebrate and invertebrate two-chambered hearts,we compared our transcriptomic data with published data from the zebrafish,a well-studied vertebrate model with a two-chambered heart.Our analysis indicated a functional similarity of ventricular genes between the mollusks and the zebrafish,suggesting that the ventricle was differentiated to achieve the same functions in invertebrates and vertebrates.As the first such study on protostomes,our findings offered initial insights into how the two-chambered heart arose,including a possible understanding of its occurrence in both protostomes and deuterostomes.

关键词： Atrium Heart evolution mollusk RNA sequencing Ventricle Zebraﬁsh

Land mollusk records from the Luochuan loess sequence and their paleoenvironmental significance

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Science China Earth Sciences 1996年第5期39卷 494-502页

作者：吴乃琴 D.D.Rousseau 刘东生 Institute of Geology. Chinese Academy of Sciences Beijing 100029 China Laboratoire de Palynologie URA 327 Universite Montpellier II France Institute of Geology Chinese Academy of Sciences. Beijing 100029 China

Terrestrial mollusk fossil assemblages of the Luochuan loess section have been investigated so as to improve the reconstruction of environmental changes in the last 110ka. A total of 118 samples, taken at an interval of 10cm in the S0-S1 portion, have been analyzed. Results show that mollusk fossil assemblages have recorded detailed paleoclimatic and paleoecological changes. The Luochuan area bas experienced cold-dry and warm-humid alternations in the last 110 ka. However, even under the prevailing cold-dry condition, short-term or seasonal warm-humid climates frequently occurred in this area, reflecting the impact of summer monsoons temporarily. Comparison of mollusk records from the Luochuan loess sequence with those of grain-size and aridity index from RC 27-61 core in the Indian Ocean reveals obvious similarities in several time intervals, suggesting that climate variations in the Loess Plateau may have been also subjected to the influences of the Indian monsoon to a certain extent in the

关键词： loess mollusk assemblages environmental factors.

The transcription of iodothyronine deiodinase genes is regulated by thyroid hormone receptor in the Pacific oyster Crassostrea gigas

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Journal of Oceanology and Limnology 2019年第4期37卷 1317-1323页

作者： HUANG Wen XU Fei LI Li QUE Huayong ZHANG Guofan Key Laboratory of Experimental Marine Biology Institute of Oceanology Chinese Academy of Sciences Qingdao 266071 China School of Marine Sciences Guangxi University Nanning 530004 China University of Chinese Academy of Sciences Beijing 100049 China Laboratory for Marine Biology and Biotechnology Qingdao National Laboratory for Marine Science and Technology Qingdao 266237 China Center for Ocean Mega-Science Chinese Academy of Sciences Qingdao 266071 China

Thyroid hormones (THs) are indispensable for each phyla in Chordata, while their functions in the non-chordate invertebrates are indistinct. Studies on the TH system in non-chordate invertebrates are important for understanding the evolution of TH system and may be applied in aquaculture or biofouling control at the same time. Iodothyronine deiodinases are keys to studying the TH system, as they are critical enzymes in maintaining TH homeostasis by catalyzing the initiation and termination of the effects of thyroid hormone in vertebrates. Here, we report the primary physiological effects of T4, the outer ring deiodinase activity, and a similar transcription regulation of two oyster deiodinases by TH receptor (CgTR) in an invertebrate, Pacific oyster Crassostrea gigas. L-thyroxine (T4) may have an important physiological function in the oyster, suggested by the growth retardation effect of excessive T4 in umbo larvae stage. The outer ring deiodinase activity transforming T4 to T3 (3, 3', 5-triiodothyronine) was then detected in the Pacific oyster in vivo, which may be conducted by two oyster deiodinases (CgDx and CgDy). Transcription regulation of CgTR onto these two deiodinase genes was also verified by electrophoretic mobility shift assay and dual luciferase reporter assay in mammalian cells. These results contribute to a better understanding of the evolution of the TH system.

关键词： iodothyronine deiodinase mollusk thyroid hormone (TH) TH responsive elements

Effects of dietary vitamin A on antioxidant responses of abalone Haliotis discus hannai Ino

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Acta Oceanologica Sinica 2006年第5期25卷 141-150页

作者： FU Jinghua ZHANG Wenbing MAI Kangsen FENG Xiuni XU Wei LIUFU Zhiguo TAN Beiping Key Laboratory of Mariculture of Ministry of Education Ocean University of China Qingdao 266003 China

A 240 d growth experiment was conducted in a re-circulated water system to investigate the effects of dietary vitamin A on growth and antioxidant responses of abalone Haliotis discus hannai Ino. Triplicate groups of juvenile abalone [ initial mass was （0.96±0. 02） g, shell length was （17.70±0.06） mm] were fed to satiation one of three send-purified diets containing 0, 1×10^3, 1×10^6 IU vitamin A per kilogram diet, respectively. Results showed that the daily increment in shell length （DISL） of abalone in the treatment with 1 × 10^3 IU vitamin A per kilogram diet was significantly higher than that with 0 or 1 × 10^6 IU vitamin A per kilogram supplementation （P 〈 0.05）. Vitamin A deficiency （0 IU/kg） significantly elevated the activities of superoxide dismutase （SOD）, glutathione peroxidase （GPX） and glutathione reductase （GR） in the viscera of abalone （P 〈 0.05）. In muscle, the effects of vitamin A deficiency on SOD and GPX activities were the same as those in viscera, however, the activity of GR significantly decreased （P 〈 0.05）. Vitamin A deficiency significantly decreased the ratio of CAT to SOD （eatalase/superoxide dismutase） in viscera （P 〈 0.05）. Nevertheless, it significantly decreased the ratio of GR to GPX in muscle （P 〈 0.05）. Compared with the supplement of 1 x 103 IU vitamin A per kilogram, excessive vitamin A （ 1 × 106 IU/kg） had no significant effects on the activities of CAT, SOD and glutathione-S-transferase （GST）（P 〉 0.05）, but significantly elevated GPX and GR activities in viscera （P 〈 0. 05）. In muscle, the activities of CAT, SOD, GPX, GST and GR were significantly decreased by the excessive dietary vitamin A supplement （P 〈 0.05）. Compared with the supplement of 1×10^3 IU vitamin A per kilogram, vitamin A-excessive had no significant effect on the value of ratio of CAT to SOD either in viscera or in muscle （ P 〉0.05 ）. The ratio of GR to GPX was significantly decreased in viscera, but significantly elevated in muscle in the vitamin A-excessive group （P 〈 0.05 ）. In conclusion, optimum supplem

关键词： Haliotis discus hannai vitamin A antioxidant enzymes mollusk