珠江口水域夏季小型底栖生物群落结构  

Analysis of the meiobenthic community in the Pearl River Estuary in summer

作　　者：袁俏君[1] 苗素英[1] 李恒翔[2] 于秀娟[2] 唐玲[2] 严岩[2] 

机构地区：[1]中山大学生命科学学院,广州510275 [2]中国科学院南海海洋研究所海洋生物资源可持续利用重点实验室,广州510301

出　　处：《生态学报》2012年第19期5962-5971,共10页Acta Ecologica Sinica

基　　金：中国科学院-国家外专局创新团队国际合作伙伴计划项目(KZCX2-YW-T001)

摘　　要：于2010年8月在珠江口水域进行小型底栖生物取样分析,结果表明,该调查水域夏季小型底栖生物的平均丰度为(183±174)个/10 cm2,平均生物量为(345±334)μg干重/10 cm2,平均生产量为(3104±3008)μg干重/10 cm2。共鉴定出小型底栖生物16个类群,按丰度,自由生活海洋线虫和双壳类幼体为优势类群,其丰度分别占调查水域小型底栖生物总丰度的62.61%和22.62%。按生物量,优势类群由双壳类幼体(50.57%)、线虫(13.33%)和多毛类(12.47%)等组成。81.15%的小型底栖生物分布在0—5 cm的沉积物中。与环境因子相关分析表明:小型底栖生物丰度、线虫丰度与温度呈显著负相关,与盐度呈显著正相关。调查水域线虫与桡足类数量的比值(N/C)呈现出由河口上游向下游递增,且西岸明显高于东岸的趋势。Meiofauna,a fundamental component of terrestrial and marine benthic ecosystems,form an integral element of food webs and play a critical role in nutrient recycling.To clarify the composition and ecological roles of meiobenthic communities within sediments of the Pearl River Estuary,Southern China,meiofauna composition,abundance,biomass and distribution were reported together with abiotic parameters（temperature and salinity of water,organic matter content organic and particle size of sediment） based on samples conducted at 16 stations（from 22.10° N to 22.80°N,113.50° E to 114.00° E） in summer,2010. A total of 16 meiofaunal groups were identified in the whole sampling study.Free living marine nematodes were the most dominant group,with an abundance of（115±115） ind./10cm2,accounting for 62.61% of the total meiofauna,followed by Bivalvia larvae（22.62%）,crustacean nauplii（5.02%）,and harpacticoid copepods（3.28%）.The remaining groups accounted for less than 2% of total meiofauna,and included Polychaeta,Nemerteana,Echiurida,Ostracoda,Kinorhyncha,Oligochaeta,Turbellaria,Tanaidacea,Cnidaria,Acarina,Tardigrada and unidentified taxa.The average abundance,biomass and production of the meiobenthos was（183±174） ind./10cm2,（345±334）μg dwt/10cm2 and（3104±3008）μg dwt/10cm2 respectively.Based on the meiobenthic biomass,the main dominant groups were bivalves（50.57% of total meiobenthos biomass）,followed by nematodes（13.33% of total） and polychaetes（12.47% of total）.Most meiobenthos（81.15%） were found distributed in the 0—5 cm layer of sediment.Vertical distribution was different for the dominant groups of the meiobenthos;bivalves and nematodes were in the 0—5 cm layer of sediment,most copepods were in the 0—2 cm layer,and polychaetes were in the 2—5 cm layer.Analysis of abiotic parameters showed that the average organic matter content of the sediment was 6.90%,which showed an increase from the west to the east of the estuary,and from the upper reaches to the lower

关 键 词：珠江口 小型底栖生物 丰度 生物量 

分 类 号：Q178.53[生物学—水生生物学]