转基因鱼试验湖泊铜锈环棱螺种群动态及次级生产力  

Population dynamics and production of Bellamya aeruginosa(Reeve)(Mollusca:Viviparidae) in artificial lake for transgenic fish,Wuhan

作　　者：熊晶[1,2] 谢志才[1] 蒋小明[1,3] 胡炜[1] 张堂林[1] 舒少武[1] 

机构地区：[1]中国科学院水生生物研究所,武汉430072 [2]湖北省环境监测中心站,武汉430072 [3]中国科学院研究生院,北京100049

出　　处：《生态学报》2011年第23期7112-7118,共7页Acta Ecologica Sinica

基　　金：国家高技术研究发展计划(2005AA60101005);国家重点基础研究发展计划(2007CB109205)

摘　　要：2008年2月至2009年1月对转基因鱼试验湖泊铜锈环棱螺的种群生态学进行了周年研究。铜锈环棱螺的平均密度和生物量分别为28.96个/m2和17.33 g/m2,丰度最高值出现在4月(34.29个/m2和54.51 g/m2),其次为12月(25.1个/m2和36.18 g/m2)。试验湖泊中铜锈环棱螺在4—7月繁殖,种群中含有4个年龄组,其中2008年龄组占绝对优势。铜锈环棱螺壳长-体重方程为:lg Ww=2.8791×lg SL-3.4227,使用瞬时生长法测算试验湖泊铜锈环棱螺的周年生产量,带壳湿重为12.72g.m-.2a-1,去壳干重为0.74 g.m-.2a-1,P/B系数为0.42。估算试验湖泊2005年至2009年铜锈环棱螺生产量(去壳干重)分别为2.24,2.49,1.50和0.74 g.m-.2a-1。多元逐步回归分析显示总氮对铜锈环棱螺的次级生产量有显著影响,转基因鲤的捕食压力也可能是影响铜锈环棱螺生产量的重要因素。Bellamya aeruginosa （Reeve） is the predominant macrozoobenthic species and main food source in an artificial lake used for rearing transgenic common carp （ Cyprinus carpio L. ） with the ＇ all-fish＇ growth hormone gene constructs. Knowledge of the life history and production of B. aeruginosa are critical in assessing the predation pressure by transgenic common carp. Between February 2008 and January 2009, the population dynamics and production of B. aeruginosa were studied at monthly intervals at seven stations in the artificial lake situated in Hubei Province, China. The instantaneous growth rate method was applied to determine the production and P/B ratio of B. aeruginosa. Production over the period 2005--2008 was then compared from the calculated P/B ratios. Finally, the important environmental factors influencing production patterns were established via multiple regression analyses. During 2008--2009, annual average density and biomass （wet weight） were 28.96 ind./m2 and 17.33 g/m2, respectively B. aeruginosa recruitment occurred mainly between April and July. A major peak in standing crops was observed in April （34.29 ind./m2 and 54.51 g/m2） , with a minor peak in December （25.1 ind./m2 and 36.18 g/m2）. Based on the peaks in population density and seasonal variations in size distribution of shell-length, the B. aeruginosa population was composed of four cohorts. Growth of the 2005 cohort had nearly ceased, while individuals of the 2008 cohort grew rapidly, with an instantaneous growth rate of 2.34. The 2008, 2007 and 2006 cohorts accounted for 20.2, 52.7 and 25.8% of total density, respectively. Regressions between shell-length and wet weight （Ww） was lg Ww = 2. 8791xlgSL-3. 4227 （n = 96, P〈0. 001 ）. To reduce the error, the growth curves of each cohort （P〈0.05） were also fitted. Using the instantaneous growth rate method, the annual production of B. aeruginosa was calculated at 12.72 g· m-2· a-1 （ wet weight） or 0.74 g· m-2· a-1 （ dry weight without shell�

关 键 词：铜锈环棱螺 次级生产量 瞬时增长率法 P/B系数 转基因鱼试验湖泊 

分 类 号：Q958.8[生物学—动物学]