| 长江口几种优势桡足类对微型浮游动物的摄食研究 |
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| 引用本文： | 汤宏俊,孙松.长江口几种优势桡足类对微型浮游动物的摄食研究[J].海洋与湖沼,2015,46(1):148-156. |
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| 作者姓名： | 汤宏俊 孙松 |
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| 作者单位： | 1. 中国科学院海洋研究所海洋生态与环境科学重点实验室 青岛 266071;中国科学院大学 北京 100049
2. 中国科学院海洋研究所海洋生态与环境科学重点实验室 青岛 266071 |
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| 基金项目： | 国家自然科学基金,41106072号;山东省自然科学基金,ZR2010DM006号;中央级公益性科研院所基本科研业务费专项资金,GY02-2012G29号。 |
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| 摘 要： | 利用现场海水培养实验,结合浮游动物网样数据,研究长江口邻近海域几种优势桡足类(中华哲水蚤、背针胸刺水蚤、太平洋纺锤水蚤和精致真刺水蚤)对微型浮游动物的摄食影响。结果表明,精致真刺水蚤虽然属于肉食性种类,但几乎不摄食微型浮游动物;其余三种杂食性桡足类中华哲水蚤、背针胸刺水蚤和太平洋纺锤水蚤对微型浮游动物(纤毛虫+异养甲藻)的摄食率分别为0.66、0.09和0.59μg C/(ind·d),分别占其日总摄食量的29%、24%和37%。其中,异养甲藻在初始生物量和对桡足类饵料贡献上分别占整个微型浮游动物的30%和28%,是微型浮游动物中一个重要的组成类群。中华哲水蚤对微型浮游动物的摄食率与初始食物浓度有显著的正相关关系,并且对体长20μm纤毛虫的清滤率要明显高于对体长20μm的纤毛虫(P0.01)的清滤率,表明其偏好摄食较大个体的食物。通过Chesson选择性指数显示,尽管微型浮游动物在生物量上远小于浮游植物,但桡足类能优先选择摄食微型浮游动物;进一步结合网采浮游动物数据,获得各站三种优势桡足类丰度平均占桡足类总丰度的77%,但它们对微型浮游动物现存生物量的摄食压力仅为0.8%,表明桡足类对微型浮游动物群落的下行控制作用并不明显,仍有大部分微型浮游动物生物量未通过摄食途径进入到桡足类群落中。
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| 关 键 词： | 桡足类 微型浮游动物 摄食 长江口 |
| 收稿时间： | 2014/2/26 0:00:00 |
| 修稿时间： | 2014/4/28 0:00:00 |
PREDATION OF SEVERAL DOMINANT COPEPODS ON MICROZOOPLANKTON IN CHANGJIANG RIVER ESTUARY |
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| TANG Hong-Jun and SUN Song.PREDATION OF SEVERAL DOMINANT COPEPODS ON MICROZOOPLANKTON IN CHANGJIANG RIVER ESTUARY[J].Oceanologia Et Limnologia Sinica,2015,46(1):148-156. |
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| Authors: | TANG Hong-Jun and SUN Song |
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| Institution: | Research Center for Marine Ecology,First Institute of Oceanography,State Oceanic Administration,Research Center for Marine Ecology,First Institute of Oceanography,State Oceanic Administration,Research Center for Marine Ecology,First Institute of Oceanography,State Oceanic Administration,College of Environment and Civil Engineering,Chengdu University of technology,Chengdu,School of Chemistry and Chemical Engineering,University of Qingdao,Research Center for Marine Ecology,First Institute of Oceanography,State Oceanic Administration |
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| Abstract: | Rivers are the primary source of terrestrial materials to the oceans. The input of the major biogenic nutrients (N, P, Si) from terrestrial systems to the ocean plays a central role in regulating global oceanic production. Here we present the nutrient observed in July 2012 and nutrient historical data sets in the Huanghe River, while focusing on the nutrient transport and its influence factors. Water chemistry parameters showed different distribution characteristics due to the topography and human activities in the Huanghe Basin. In general, nutrients and suspended particulate matter concentration is low in the upstream, and relatively stable in the middle and high in lower part of the Huanghe River to a certain extent. Compared to Guide station, suspended particulate matter, nitrate and dissolved silica increase by 66%, 60% and 800% in Lijin station of the Huanghe River. The ratios of nitrogen and phosphorus showed an increasing trend along the water direction in the Huanghe River. And phosphorus limit is of great nutrient limitation. Huanghe Nitrogen in water increases significantly and stays at a high level in the world; while silicate and phosphorus decreased or remain relatively stable. From the current analysis, human activity plays an important role on nitrogen increasing of the Huanghe River, while decreasing of erosion soil and sediment result to silica and phosphorus reduction in the Huanghe River. Since 1986, dissolved silicon decreased by about 34% due to reduced basin sediment in the Huanghe River, which should be paid further attention. |
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| Keywords: | Huanghe River (Yellow River) Nutrient Biogenic silica Soil Withdrawal nutrient |
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