| ZHENG Xinqing,HUANG Lingfeng,WANG Qian,LIN Rongcheng. 2014. Amphipods fail to suppress the accumulation of Ulva lactuca biomass in eutrophic Yundang Lagoon. Acta Oceanologica Sinica, 33(12):155－162 |
| Amphipods fail to suppress the accumulation of Ulva lactuca biomass in eutrophic Yundang Lagoon |
| 端足类无法抑制富营养化潟湖——筼筜湖石莼(Ulva lactuca)生物量的积累 |
| Received:November 06, 2013 Revised:July 06, 2014 |
| DOI：10.1007/s13131-014-0532-4 |
| Key words:amphipods Ampithoe valida consumption gross growth efficiency secondary production Ulva lactuca |
| 中文关键词: 端足类 强壮藻钩虾 摄食量 总生长效率 次级产量 石莼 |
| 基金项目:The Natural Science Foundation of Fujian Province under contract No. 2014J01127; the Public Science and Technology Research Funds Projects of Ocean under contract Nos 201205009-3 and 201105012. |
| Author Name | Affiliation | E-mail | | ZHENG Xinqing | Third Institute of Oceanography, State Oceanic Administration, Xiamen 361005, China | | | HUANG Lingfeng | Key Laboratory of the Ministry of Education for Coastal and Wetland Ecosystems, Xiamen University, Xiamen 361005, China
College of the Environment and Ecology, Xiamen University, Xiamen 361005, China | huanglf@xmu.edu.cn | | WANG Qian | China Ocean Press, Beijing 100081, China | | | LIN Rongcheng | Third Institute of Oceanography, State Oceanic Administration, Xiamen 361005, China | |
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| Abstract: |
| The Gross growth efficiency (GGE) is defined as the amount of consumer carbon produced relative to the amount of prey ingested in a given time interval. In population ecology, it can be considered as an index for the ability of a consumer to convert the biomass of food into its population production. In this study, it was firstly applied to estimate the role of amphipods grazing in the biomass dynamics of macroalgae (Ulva lactuca) in Yundang Lagoon (a subtropical eutrophic coastal lagoon, Xiamen City, China). It was found that amphipods were the dominant group (82.2%-98.7%) in the benthic assemblage, in which five amphipod species (Corophium uenoi, Ampithoe valida, Grandidierella japonica, Grammaropsis laevipalmata and Caprella panantis) were observed in the lagoon. However, only A. valida significantly consumed U. lactuca among these amphipod species. A series of experiments were conducted to estimate the consumption of U. lactuca by A. valida. It was suggested that the monthly secondary production (P) of A. valida using size frequency method ranged from 2.39 to 13.68 g/m2. GGE of A. valida exponentially reduced with body size and was closely associated with water temperature. Therefore, GGE equation for different months using the temperature recorded during the field investigation was fitted. The monthly consumption of U. lactuca was figured out to be 86.7-1 549.0 g/m2 by the sum of consumption (P/GGE) by A. valida at different size, accounting for 2.0%-37.5% of U. lactuca production. It indicates that the grazing effect of A. valida did play a role in reducing the accumulation of U. lactuca biomass when A. valida was abundant, but it finally fails to limit the U. lactuca growth in Yundang Lagoon. Low abundance of A. valida and high nutrient loading may be two major reasons for the outbreak of U. lactuca bloom in the lagoon. |
| 中文摘要: |
| 总生长效率(GGE)指的是消费者的净产量占其摄食量的比值.本研究首次应用总生长效率的定义估算了端足类对富营养化沿岸潟湖——厦门市筼筜湖大型绿藻石莼(Ulva lactuca)生物量的摄食控制作用.端足类是筼筜湖大型底栖动物的绝对优势类群(82.2%~98.7%),调查共发现强壮藻钩虾(Ampithoe valida)、上野蜾蠃蜚(Corophium uenoi)、平掌拟钩虾(Grammaropsis laevipalmata)、日本大螯蜚(Grandidierella japonica)以及尖额麦秆虫(Caprella panantis)5种端足类.不过,在这5种端足类中,仅强壮藻钩虾能明显的摄食大型海藻.因此,为了估算筼筜湖端足类对大型海藻的摄食量,本研究利用体长频数法(size frequency method)估算了强壮藻钩虾的次级生产力并利用室内实验研究了不同温度(15℃,20℃,25℃和30℃)强壮藻钩虾的GGE与体长的相关关系.结果显示,强壮藻钩虾的月种群产量介于2.39~13.68g/m2.GGE随着体长的增加呈指数性降低且和水温存在显著的相关关系.因此,利用不同月份的平均水温数据,本研究拟合了调查期间各月强壮藻钩虾的GGE与其体长的关系.根据总生长效率的定义,计算出强壮藻钩虾对石莼的月摄食量介于86.7~1549.0g/m2,占石莼生产量的2.0~37.5%.本研究的结果表明,强壮藻钩虾能显著减少石莼生物量的积累,但仅在丰度较高的2~4月份起作用,且它无法抑制筼筜湖石莼的生长.强壮藻钩虾低的丰度以及筼筜湖高的营养负载可能是筼筜湖石莼绿潮的主要原因. |
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