根据2011年5月-2012年4月进行的9个航次(月)的底拖网调查数据,研究了莱州湾头足类的群落结构特征、时空分布以及环境因子的影响,以期为头足类资源的利用和保护提供理论依据。结果表明:148次拖网采集头足类样本共37947个,隶属于3目、3科、4属、6种。头足类生物量及个体数密度均以10月最高、3月最低,周年平均值分别为3111.39 g/h和723.54ind/h。枪乌贼(***)为莱州湾头足类的周年优势种,其相对重要性指数(The index of relative importance,IRI)为13097;短蛸(Octopus ocellatus)为重要种,其IRI为714;长蛸(Octopus variabilis)为常见种,其IRI为81;双喙耳乌贼(Sepiola birostrata)和毛氏四盘耳乌贼(Euprymna morsei)均为稀有种,其IRI均小于1。头足类生物量以2011年6-11月较高,其中6-7月主要分布于莱州湾中南部、8-11月主要分布于莱州湾北部。聚类(CLUSTER)和非度量多维标度分析(MDS)显示,9个航次(月)在85%相似性水平上被划分为4个群组,18个调查站位在90%相似性水平上被划分为5个群组。莱州湾头足类的个体数分布与浮游动物密度的相关性最高,其次为pH值和水深,与海表温度、溶解氧及盐度的相关性最低。
[Objective] The aim was to estimate the heritability and genetic correlations of growth traits of Chinese shrimp Fenneropenaeus chinensis so as to provide basis and technical parameters for the breeding and selecting ...
详细信息
[Objective] The aim was to estimate the heritability and genetic correlations of growth traits of Chinese shrimp Fenneropenaeus chinensis so as to provide basis and technical parameters for the breeding and selecting of Chinese shrimp.[Method] 51 full-sib families（including 35 half-sib families）of the Chinese shrimp *** were obtained by artificial *** growth traits of these families were measured,including body length,cephalothorax length,abdorminal segment length and body *** to quantitative genetics theory,the heritability of each growth trait,genetic and phenotypic correlation among these traits was statistically studied.[Result] The heritability was 0.36-0.51 for body length,0.14-0.24 for cephalothorax length,0.25-0.50 for abdominal segment length,and 0.04-0.29 for body *** and positive genetic correlations were obtained among growth *** genetic correlation between body weight and abdominal segment length was the highest（0.92）,followed by body length and abdominal segment length（0.91）,body length and body weight（0.88）,body weight and cephalothorax length（0.87）,abdominal segment length and cephalothorax length（0.86）,while the genetic correlation between body length and cephalothorax length was the lowest（0.83）.[Conclusion] The phenotypic correlation of body length,cephalothorax length,abdorminal segment length and body weight of Chinese shrimp *** were from 0.80 to 0.90 with extremely significant difference（P0.01）among the four growth traits by t-test.
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