摘要
以三峡库区即将淹没的嘉陵江下游江段瓦氏黄颡鱼 ( Pelteobagrusvachelli)的成鱼群体为实验对象 ,于 2 0 0 0年 1 2月至 2 0 0 1年 1 0月期间 ,分冬、春、繁殖期、繁殖后、秋季 5个时期共采集到标本 1 1 4尾 (体重变幅为 47.60～ 1 65 .30 g)。其中冬、春、繁殖后、秋季分别采集雌、雄性标本各 1 0尾 ;繁殖期的雌性标本为 1 4尾 ,雄性 2 0尾。测定了这 1 0个样本的鱼体化学组成 ,估算了其能量密度 ,并对鱼体的化学组成与能量密度进行了相关分析 ,以期为三峡工程截流后鱼类种群变动的对比研究提供基础资料。实验结果表明 :各时期样本能量密度均分别与干物质含量和脂肪含量呈显著的直线相关关系 ,冬季雌性和秋季雄性样本的能量密度与蛋白质含量之间的负相关关系达到显著性 ,繁殖后雌性样本及春季、繁殖期、繁殖后和秋季雄性样本的能量密度与灰分含量也呈显著的负相关关系。通过对 1 0个样本各自的能量密度 ( k J/ g)分别与其干物质含量 ( D,% B.W.)的直线回归方程的协方差分析 ( ANCOVA) ,可将雄性 5个样本的回归方程合并为一个公共方程作为预测雄性鱼体能量密度 ( EA)的模型 :EA=- 4.33+ 0 .40 8D,将雌性冬季、春季、繁殖后及秋季的 4个回归方程合并为一个公共方程作为预测雌性鱼体非繁殖期的能量密度 (
From December, 2000 to October, 2001, 114 specimens of adult Pelteobagrus vachelli, with body weight of 47.60～165.30g, were collected in 5 periods, winter, spring, spawning, post-spawning and autumn, in lower reach of the Jialing River where the reservoir of the Three Gorges Project will inundate. For each period, the samples were divided according to sex for analysis, i.e. 10 males and 10 females for winter, spring, post-spawning and autumn and 20 males and 14 females for spawning. In the 10 sample groups chemical composition was measured, energy density estimated and the relationship between the energy density and the chemical composition analyzed, in order to present the information about the energetic characteristics of this fish as a baseline for further study on ecological changes in the species after the project has been completed. The results showed that there was a significantly linear relationship in each sample between energy density and either dry mass or lipid content, respectively. Significantly linear relationships were also noted between energy density and protein content in the autumn males and in the winter females, and between energy density and ash content in the spring, spawning, post-spawning and autumn males, and in the post-spawning females. By analysis of covariance (ANCOVA) on the regression equations, a common equation for the male was developed to predict energy density (E A, kJ/g) with dry mass content (D) as predictor as following: E A=-4.33 + 0.408D, that for the female in non-spawning periods, i.e. winter, spring, post-spawning and autumn, as: E B=-3.09 +0.395D, and that for the spawning females as: E C=3.16 + 0.381D. The lipid content of the fish ranged from 8.72 to 14.3% based on the body weight and from 30.5 to 43.7% on the dry mass. This lipid content is higher than that of most reported species.
出处
《生态学报》
CAS
CSCD
北大核心
2003年第1期122-129,共8页
Acta Ecologica Sinica
基金
国家自然科学基金资助项目 ( 30 1 70 72 5 )~~
关键词
瓦氏黄颡鱼
季节
鱼体
化学组成
能量密度
预测模型
脂肪含量
三峡库区
Pelteobagrus vachelli
energy densiy
chemical composition
prediction model
lipid content
Three Gorges Reservoir
