Genetic parameter estimates for growth traits at early stage of Pacific abalone,Haliotis discus hannai Ino   总被引：2，自引：0，他引：2  

DENG Yuewen  LIU Xiao  ZHANG Guofan  ZHAO Hongen 《海洋学报(英文版)》2007,26(5):90-95

Heritability and genetic and phenotypic correlations were estimated for juvenile growth traits of Pacific abalone Haliotis discus hannai Ino.The estimates were calculated from shell length and shell width measurements on progeny resulting from 12 half-sib families and 36 full-sib families obtained using artificial fertilization of mating three females to each male.The measurements were taken at 10,20 and 30 d after fertilization.It was found that heritability estimates based on sire component ranged from 0.23 to 0.36 for shell length and 0.21 to 0.32 for shell width.Heritability estimates from dam component were larger than those from sire component at three ages,indicating presence of maternal effects,non-additive genetic effects and common environmental effects.Phenotypic correlations were significant at three ages(P < 0.05),with values of 0.92,0.93 and 0.92,respectively.Genetic correlations from the paternal half-sib correlation analysis were highly positive at three ages,with values of 0.50,0.78 and 0.81,respectively.The results suggest that selective breeding is an effective approach to improving growth traits of Pacific abalone stocks.  相似文献   

Effects of effective population size on the F₂ growth and survival of bay scallop Argopecten irradians irradians(Lamarck)   总被引：1，自引：0，他引：1  

ZHANG Haibin  LIU Xiao  ZHANG Guofan  ZHANG Guizhen 《海洋学报(英文版)》2005,24(4):114-120

In 2002, six cohorts ofbroodstock bay scallop Argopecten irradians irradians （Ne=1, 2, 10, 30, 50 and control） were randomly chosen from a population of bay scallop to produce offspring. After one year rearing, with the progeny matured, the similar experiment was done to produce the F2 generation. To determine the magnitude of Ne effects, the growth and survival rates in larvae and adult of six F2 groups were compared. Results showed that inbreeding depression existed not only in the Ne=1 group but also in the Ne=2 group. The growth and survival rates of the two groups were significantly lower than those of the other groups （Ne=10, 30, 50, control）, and there were no significant differences among the latter （P〉0.05）. At the same time, the amount of depression in the Ne=1 group was significantly higher than that of the Ne=2 group （P〈0.05）. These results indicated that the low effective population size （Ne）, which increases the possibility of inbreeding, could lead to some harmful effects on the offspring. So it is essential to maintain a high level of Ne in commercial seed production. Fta＇thermore, as the high fecundity of bay scallop might lead to increased inbreeding, selecting broodstock from different growout sites is recommended.  相似文献   

Analysis of Thermal Transfer of Reinforced Concrete Submarine Oil Tanks     

Song Yupu Zhao Guofan Ph. D. Professor  The State Key Laboratory of Coastal  Offshore Engineering  Dalian University of Technology  Dalian Professor 《中国海洋工程》1994,(2)

-The temperature distributions obtained by different methods of analysis for solving thermal transfer of reinforced concrete (R. C.) submarine oil tanks (RCSOT), including flat wall method, cylinder wall method and finite element method, are compared with the experimental data of thermal transfer of RCSOT. The precision and scope of applicability of different methods are discussed. The principle for selecting analysis method for solving thermal transfer of RCSOT is given. The analytical and experimental temperature distributions show that the wall of RCSOT should consist of double walls and empty space between them should be filled with sand or other heat insulation materials to reduce the temperature difference of the wall and to prevent concrete from cracking.  相似文献   

Stress Variation Model of Bond Stress-Slip Relationship Between Steel Bar and Concrete     

Song Yupu Zhao Guofan Doctor  Professor  Dalian University of Technology  Dalian Professor  Dalian University of Technology  Dalian 《中国海洋工程》1994,(1)

Based on the experimental data, a stress variation model of the bond stress-slip relationship between steel bar and concrete is established. The characteristic of the model is that the boundary conditions are satisfied very well; the effects of the material properties, the concrete cover, the crack spacing and the distance from the cracked cross section are considered. Good agreement between measured and calculated bond stress-slip relationship is found. This model is useful for the study of the stiffness, deformation and crack width of reinforced concrete members, and for the nonlinear analysis of reinforced concrete structures by the finite element method.  相似文献   

我国贝类产业技术的现状与发展趋势     

阙华勇  张国范 《海洋科学集刊》2016,51(51):69-76

中国海水养殖规模和产量稳居世界首位,海水贝类在海水养殖中占有重要地位。我国贝类产业在技术研发、应用推广等方面取得了显著成绩。本文介绍了贝类产业链中种质创新、生态养殖、高值化加工等产业技术取得的成果,分析了面临的挑战、亟需解决的产业问题及发展趋势,以期为我国贝类产业技术的发展提供参考,推动产业转型升级和提质增效,实现贝类产业的健康可持续发展。  相似文献   

Heterosis and combining ability: a diallel cross of three geographically isolated populations of Pacific abalone Haliotis discus hannai Ino   总被引：1，自引：0，他引：1  

邓岳文  刘晓  张国范  吴富村 《中国海洋湖沼学报》2010,28(6):1195-1199

We conducted a complete diallel cross among three geographically isolated populations of Pacific abalone Haliotis discus hannai Ino to determine the heterosis and the combining ability of growth traits at the spat stage. The three populations were collected from Qingdao (Q) and Dalian (D) in China, and Miyagi (M) in Japan. We measured the shell length, shell width, and total weight. The magnitude of the general combining ability (GCA) variance was more pronounced than the specific combining ability (SCA) variance, which is evidenced by both the ratio of the genetic component in total variation and the GCA/SCA values. The component variances of GCA and SCA were significant for all three traits (P<0.05), indicating the importance of additive and non-additive genetic effects in determining the expression of these traits. The reciprocal maternal effects (RE) were also significant for these traits (P<0.05). Our results suggest that population D was the best general combiner in breeding programs to improve growth traits. The DM cross had the highest heterosis values for all three traits.  相似文献   

东南亚陆缘的卫重异常及其形成机制初探     

周国藩  杨森楠  戴勤奋 《福建地质》1989,(4)

在东亚的陆缘地区。存在着一系列的陆缘弧。本文利用地面和根据GEMIOC地球模型的重力位球谐系数所计算的卫星重力资料,从地球动力学的角度探讨了其中几个陆缘弧的形成机制。重点探讨了我目东南沿海陆缘弧的重力异常特征及其形成机割。  相似文献   

马桑根瘤的固氮活性与呼吸强度     

杨忠  刘国凡  邓廷秀 《山地学报》1993,(4)

马桑Coriaria sinica根瘤固氮与呼吸作用具有一定的依赖关系。根瘤的二氧化碳呼出量与乙烯生成量之日平均比值(CO_2:C_2H_4值)为6.263±1.202。此值在一定程度上反映了固氮对能量的需求,但受土壤温度和湿度的影响而变化甚大。  相似文献   

Sensitivities of species compositions of the mixed forest in eastern Eurasian continent to climate change   总被引：2，自引：0，他引：2  

Guofan Shao  Xiaodong Yan  Harald Bugmann 《Global and Planetary Change》2003,37(3-4):307

Sensitivities of species compositions of the broadleaf–conifer mixed forest in eastern Eurasian continent to climate change were evaluated with three forest gap models, namely KOPIDE, NEWCOP, and ForClim. Testing sites are located on Changbai Mountain, the middle of the distribution range for the mixed forest. Six climate change scenarios characterizing increase in temperature and increase/decrease in precipitation were used to test the sensitivities of species composition to climate change. Simulations suggest that the mixed forest in temperate Monsoon Asia will face changes in species composition should climate change be almost certain. At the minimum level, the order of dominant species is going to change due to species competition, resulting in the increase in the proportion of broadleaved tree species in the forest. If air temperature increases and precipitation decreases, Pinus koraiensis is going to disappear from the forest and the mixed forest will become hardwood forest. This experiment supports some earlier predictions under other climate change scenarios.  相似文献   

Characteristics of Deformation and Strength of Concrete in Plane Strain State     

Song Yupu Zhao Guofan Professor 《中国海洋工程》1993,(1)

- The characteristics of deformation and strength of concrete under the plane strain condition are studied experimentally with the triaxial apparatus designed by the authors and are compared with those under the plane stress condition. A formula of stress transformation between plane stress and plane strain conditions is proposed for the elasto-plastic state, and it provides a theoretical basis for simplifying nonlinear analysis and fully using the strength of concrete.  相似文献