Estimated reproductive success of brooders and heritability of growth traits for large yellow croaker (Larimichthys crocea) using microsatellites     

���͵�  �����  ��־��  ������  Ҧ���  ���쿭 《中国海洋湖沼学报》2011,29(5):990-995

We estimated the reproductive success of adult brood fish and the heritability of growth-related traits for large yellow croaker (Larimichthys crocea). We created two independent full-factorial cross groups (1 and 2) by crossing 4 males×4 females and 4 males×3 females, respectively. We measured the body weight (BW), body length (BL), and body height (BH) of 281 individuals from group 1 and 318 individuals from group 2 at 20 months post hatch (harvest age). We also collected a tissue sample from each individual. The parents and offspring were genotyped using six polymorphic microsatellites. Of the 599 offspring, 99.2% were assigned to a single pair of parents. In both groups, some parent pairs produced a large number of offsprings while other pairs did not produce any offspring. The genetic diversity and putative Ne were lower in the offsprings than in the parents in both groups. The heritability estimates at 20-month age were 0.13±0.10 for BW, 0.19±0.13 for BL, and 0.09±0.06 for BH. The genetic and phenotype correlation between BW, BL, and BH was close to 1. The results provide basic information for selective breeding and further genetic characterization of large yellow croaker.  相似文献   

Assessing adaptability of planted trees using leaf traits: A case study with Robinia pseudoacacia L. in the Loess Plateau, China   总被引：1，自引：0，他引：1  

Tiantian Jin  Guohua Liu  Bojie Fu  Xiaohui Ding  Lei Yang 《中国地理科学(英文版)》2011,21(3):290-303

Leaf trait patterns and their variations with climate are interpreted as an adaptive adjustment to environment.This study assessed the adaptability of planted black locust (Robinia pseudoacacia L.) based on the analysis of leaf traits and the comparison of its leaf traits with inter-specific ones existing in the same area.We measured some water and N use related leaf traits: leaf dry mass per unit area (LMA) and N,P and K concentrations based on both leaf area (Narea,Parea and Karea) and leaf mass (Nmass,Pm...  相似文献   

Mechanical shaking and soil water affect the growth of Psammochloa villosa in the Mu Us Sandland     

Y.-H. Wang  M. DongF.-H. Yu  H. JiangS.-Q. Yu  X.-Q. LinW.-M. He 《Journal of Arid Environments》2011,75(10):974-977

The Mu Us Sandland is basically characterized by water shortage and high wind. Thus, wind-induced mechanical perturbation (MP) and soil water availability are likely to interact to affect plant growth. Since high water availability and MP can induce responses that are in the opposite direction, we hypothesized that MP effects on perennial grasses might be mitigated by increased soil water availability in the Mu Us Sandland. We counducted an experiment in which seedlings of Psammochloa villosa were subjected to two levels of MP (non-MP vs. MP 1 min d⁻¹) and two levels of water availability (200 ml d⁻¹vs. 400 ml d⁻¹) and measured three plant traits. MP significantly decreased plant height, total biomass, and root/shoot ratio. There were significant interactions between MP and soil water availability on plant height and root/shoot ratio. These findings imply that MP alone is a stressful factor for P. villosa and MP effects on its growth can be partially mitigated by increased soil water availability, and also suggest that P. villosa may respond to MP in a way that allows plants to survive in the windy semiarid environments.  相似文献   

气温变化对冬小麦生育的影响   总被引：5，自引：1，他引：5  

陈英慧宋建玉  房稳静 《河南气象》2003,(1):30-31

利用驻马店市1961年10月—2002年5月冬小麦生长季内平均气温资料以及气温5年滑动平均变化曲线图，采用相关分析法，分析了驻马店市冬小麦生长季内气温变化特征，并利用1981年以后的冬小麦作物观测资料，经过对比分析，揭示了冬小麦生长发育过程中因暖温而产生的一系列变化。  相似文献   

几种海洋蓝藻生长条件的研究   总被引：4，自引：0，他引：4  

王起华  施定基 《海洋科学》1997,21(4):60-63

对Ｓｙｎｅｃｈｏｃｏｃｃｕｓ ｂａｃｉｌｌａｒｉｓ，Ｏｓｃｉｌｌａｔｏｒｉａ ｌｕｄ，Ｓｃｈｉｚｏｔｈｒｉｘ ｃａｌｃｉｃｏｌａ，Ｓｐｉｒｕｌｉｎａ ｐｌａｔｅｎｓｉｓ等４各海洋蓝藻的生长条件的研究表明，除Ｓ．ｐｌａｔｅｎｓｉｓ外，其他３种蓝藻在“ｆ／２”培养基中生长良好，外源生长因子对生长有不同程度的促进作用。Ｓ．ｂａｃｉｌｌａｒｉｓ适应较高光强，其温度和ｐＨ最适范围较窄，Ｓ．ｃａｌｃｉｃｏｌａ  相似文献   

华北地区不同底墒对冬小麦生长发育及产量影响的研究   总被引：7，自引：0，他引：7       下载免费PDF全文

刘庚山  安顺清  吕厚荃  郭安红 《应用气象学报》2000,(Z1)

1997年 9月至 1 999年 6月在中国气象局固城农业气象试验基地人工控制农田水分试验场进行了冬小麦不同底墒处理的试验 ,结果表明 :底墒显著影响冬小麦的生长发育和产量 ,对冬小麦总生物量、地上和地下生物量的影响在小麦生长后期比前期明显 ;底墒与植株高度、叶面积系数有良好的二次曲线关系 ;底墒显著影响产量构成因素 ,其与籽粒重有相当好的二次曲线关系 ,并据此确定了冬小麦播种时不同深度土层的最佳底墒 :0～ 1 m为 88% ,0～ 2 m为82 % .  相似文献   

Numerical Modelling Of Turbulent Airflow Over Water Waves     

P. Y. Li  D. Xu  P. A. Taylor 《Boundary-Layer Meteorology》2000,95(3):397-425

A nonlinear numerical model is developed for turbulent boundary-layer flowover a train of water waves of finite amplitude or slope. The airflow isassumed to be steady, two-dimensional, and neutrally-stratified. The wavesurface is assumed to be aerodynamically rough and flow conditions at thewave surface are prescribed. The numerical model used in this study adoptsthree turbulence closure schemes with different degrees of physicalcompleteness. Two of these are second-order schemes, whichare believed to describe turbulent flow more completely than thesimpler closures used in most previous studies. Although models with all turbulence closures agree qualitatively in the prediction of the amplitude of the surface normal stress perturbation, the lower- and higher-order closures differ significantly in predictions of phase, and hence the form drag and energy transfer rate between wind and waves. Our model results are in reasonable agreement with field and laboratory measurements, although predicted energy transfer rates are generally at the low end of the range of experimental values. Cases with airflow at various angles to the wave direction are also considered.  相似文献   

生长素QS在钝顶螺旋藻养殖中的应用     

朱友芳  王大志  孔庆璞  罗云峰 《台湾海峡》2000,19(3):367-371

钝段螺旋藻（Ｓｐｉｒｕｌｉｎａ ｐｌａｔｅｎｓｉｓＧｅｉｔｌｅｒ）培养在低浓度ＮａＨＣＯ３（２～５ｇ／ｄｍ＾３）和适量生长素ＱＳ（０．５～５ｍｇ／ｄｍ＾３）中,研究了生长素ＱＳ对钝顶螺旋藻生长、生物量和生化组成的影响,结果表明,在生长素ＱＳ为１ｍｇ／ｄｍ＾３,ＮａＨＣＯ３浓度为５ｇ／ｄｍ＾３时,钝顶螺旋藻的生长最好,生物量、蛋白质及总碳水化合物的含量也与主浓度ＮａＨＣＯ３（８ｇ／ｄｍ＾３）培养条件下的基本相同,说明生物素ＱＳ的加入在一定程度上可降低ＮａＨＣＯ３的使用量,而不影响钝顶螺旋藻生长、生物量和生化组成。因而生长素ＱＳ在钝顶螺旋灌的养殖中可作为ＮａＨＣＯ３部分替代剂,从而达到降低养殖成本的目的。  相似文献   

软岩地区钻孔嵌岩灌注桩承载力确定的探讨   总被引：2，自引：0，他引：2  

唐胜传  黄润秋 《地质灾害与环境保护》1999,10(3):43-47

单桩承载力的确定,在桩基础的设计中占有重要地位。但在软岩地区由于地层岩性的不同,单桩承载力的实际工作性状与国家规范的规定之间不尽相同。根据实测资料对软岩地区的单桩承载力的确定方法进行探讨,综合考虑嵌岩段侧阻力与端阻力之间的相互协调对嵌岩段所能提供的承载力的影响,提出一种新的计算方法,并结合工程实例,进行验证。  相似文献   

裙带菜配子体对三种重金属离子毒性耐受力的研究   总被引：2，自引：0，他引：2  

侯和胜  李凝  吴超元  刘海航 《海洋与湖沼》1998,29(3):280-286

裙带菜于１９９４年采自威海市俚岛养殖场。１９９５年２月－１９９７年３月,用不同浓度（０,１,１０,１００,１０００μｍｏｌ／Ｌ）的Ｃｕ＾２＋,Ｃｄ＾２＋和Ｚｎ＾２＋处理裙带菜配子体,研究这些重金属对其生长和代谢的影响。结果表明,Ｃｕ＾２＋对裙带菜配子体生长的抑制效应最强：在１μｍｏｌ＋Ｌ时已出现抑制效应,叶绿素含量和光合作用速率明显下降,脯氨酸和丙二醛含量升高;１０μｍｏｌ／Ｌ时,配子体生长几乎停  相似文献