筼筜湖大型海藻群落的几种钩虾亚目端足类的种群产量研究

Abstract

于2007年12月到2008年5月在厦门筼筜湖采集端足类样品,分析了筼筜湖大型海藻群落中端足类的种群结构并估算其种群产量。结果显示,生活在筼筜湖大型海藻群落的端足类生活史短暂,上野蜾蠃蜚(COrOPHIuM uEnOI)、日本大螯蜚(grAndIdIErEllA JAPOnICA)和强壮藻钩虾(AMPITHOE VAlIdA)的股群生产时限分别为30,120和90d。在各月采集的样品中,筼筜湖端足类具有雌体个体占优势,抱卵雌体和幼体数量比例高的种群结构特征。筼筜湖端足类种群生产力很高,每6个月上野蜾蠃蜚、强壮藻钩虾和日本大螯蜚的种群产量分别为101.91,29.17和9.49g/M2(干重),半年周转率分别为12.34,8.34和4.93。推测大型海藻群落中丰富的食物资源和端足类自身的生活史策略是筼筜湖端足类种群产量高的主要原因。此外,种群内个体的迁移也可能导致某些端足类(如强壮藻钩虾)种群生产力的高估。

The population structures of Gammaridae amphipods in Yundang Lagoon were studied from Noverber 2007 to May 2008 when macroalgae existed in the lagoon,and their population productions were estimated by the size-frequency method.The results showed that,the amphipods(i.e.,Corophium uenoi,Grandidierella japonica and Ampithoe valida) dwelling in the Ulva lactuca canopy were characterized by short life cycle,female-biased quantity structure and high proportion of ovigerous individuals and juveniles,revealing high population production and semiannual turnover rate in Gammaridae amphipods,being up to(dw) 101.91 g dw/m2/6 month and 12.34/6 month for C.uenoi,9.49 g dw/m2/6 month and 4.93/6 month for G.Japonica and 29.17 g dw/m2/6 month and 8.34/6 month for A.valida,respectively.It was suggested that rich food resources from macroalgal canopies and the life cycle strategy of amphipods should be accounted for such high population production of Gammaridae amphipods in Yundang Lagoon.However,the migration of individuals may cause the overestimation of population production of some amphipods,e.g.A.valida.