本文選題：種群參數(shù)　切入點(diǎn)：生長(zhǎng)　出處：《動(dòng)物學(xué)雜志》2016年06期

【摘要】：長(zhǎng)薄鰍(Leptobotia elongata)為長(zhǎng)江上游特有種,由于過(guò)度捕撈和大壩建設(shè),其種群生存受到極大威脅,已被《中國(guó)物種紅色名錄》列為易危物種。為了解三峽工程蓄水后該物種的種群動(dòng)態(tài),利用2007~2009年三峽庫(kù)區(qū)以上江津江段的漁獲量和體長(zhǎng)頻率數(shù)據(jù)評(píng)估了其生長(zhǎng)和死亡參數(shù)、資源量及資源利用。長(zhǎng)江上游江津江段長(zhǎng)薄鰍體長(zhǎng)范圍為76~480 mm,體重范圍為5~2 002 g,平均體長(zhǎng)為(158.7±54.8)mm,平均體重為(72.4±148.8)g。優(yōu)勢(shì)體長(zhǎng)組為90~210 mm,約占總數(shù)的77.9%(n=277)。長(zhǎng)薄鰍體長(zhǎng)(L,單位mm)與體重(W,單位g)冪函數(shù)關(guān)系為:W=7.28×10㧟6L3.09(R~2=0.95,P0.01,n=277)。由體長(zhǎng)頻率法擬合出長(zhǎng)薄鰍漸近體長(zhǎng)(L_∞)為555 mm,生長(zhǎng)系數(shù)(k)為0.17/a。由Pauly經(jīng)驗(yàn)公式估算出其自然死亡系數(shù)(M)為0.37。由長(zhǎng)度轉(zhuǎn)漁獲物曲線(xiàn)估算出其總死亡系數(shù)(Z)為1.23。江津江段長(zhǎng)薄鰍資源開(kāi)發(fā)率為0.70,超過(guò)了其資源最大開(kāi)發(fā)率0.43,表明其資源已過(guò)度開(kāi)發(fā)。由體長(zhǎng)結(jié)構(gòu)實(shí)際種群分析估算出江津江段2007、2008和2009年長(zhǎng)薄鰍年資源量分別為2 544尾/km(0.75 t/km)、2 405尾/km(0.42 t/km)和7 245尾/km(1.63 t/km),平均4 065尾/km(0.93 t/km)。與以往研究相比,本研究記錄到了長(zhǎng)薄鰍的最大個(gè)體(體長(zhǎng)480 mm);本研究估算的長(zhǎng)薄鰍總死亡系數(shù)和資源開(kāi)發(fā)率較高,可能與江津江段的捕撈強(qiáng)度較高有關(guān)。建議加強(qiáng)長(zhǎng)薄鰍種群動(dòng)態(tài)長(zhǎng)期監(jiān)測(cè),采取禁漁、人工增殖放流等措施促進(jìn)資源恢復(fù)。
[Abstract]:Leptobotia elongata is a endemic species in the upper reaches of the Yangtze River. Because of overfishing and dam construction, its population survival is greatly threatened and has been listed as a vulnerable species in the Red list of species of China. In order to understand the population dynamics of the species after the three Gorges Project impoundment, The growth and death parameters were evaluated by using the catch and body length frequency data of Jiang Jin section above the three Gorges Reservoir area from 2007 to 2009. Resource quantity and resource utilization. The body length and body weight range of the long and thin Loach in Jiang Jin section of the upper reaches of the Yangtze River are 76480mm, 52.002g, 158.7 鹵54.8mm, and the average body weight is 72.4 鹵148.8mm. the dominant body length group is 90,210mm, which accounts for about 77.9nc277m of the total amount of Loach. The power function relation with weight W, unit g is 7. 28 脳 10? The Asymptotic length of Loach (L _ 鈭，

本文編號(hào)：1657832