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| Amphipods fail to suppress the accumulation of Ulva lactuca biomass in eutrophic Yundang Lagoon |
| Amphipods fail to suppress the accumulation of Ulva lactuca biomass in eutrophic Yundang Lagoon |
| Received:November 06, 2013 Revised:July 06, 2014 |
| DOI： |
| Key words:Amphipods Ampithoe valida consumption gross growth efficiency secondary production Ulva lactuca |
| 中文关键词: Amphipods Ampithoe valida consumption gross growth efficiency secondary production Ulva lactuca |
| 基金项目:Public Science and Technology Research Funds Projects of Ocean (grant No: 201205009-3)and Key-Tech Program of Xiamen City (grant No. 3502Z20102005) |
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| Abstract: |
| The Gross growth efficiency (GGE) is the ratio of biomass ingested that is converted to biomass by an organism in a given time interval. In population ecology, it can be considered as an index for the ability of a predator species to convert the biomass of food into population production. In this study, we firstly applied it 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 DW/m2. GGE of A. valida exponentially reduced with body size and was closely associated with water temperature. Thus, 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 86.68.4-1549.05 g DW/m2 by the sum of consumption (P/GGE) by A. valida at different size, accounting for 2.02-37.50% of U. lactuca production. It indicates that A. valida fails to limit the U. lactuca growth in Yundang Lagoon. Low abundance of the species and high nutrient loading may be two major reasons for the outbreak of U. lactuca bloom in the lagoon. |
| 中文摘要: |
| The Gross growth efficiency (GGE) is the ratio of biomass ingested that is converted to biomass by an organism in a given time interval. In population ecology, it can be considered as an index for the ability of a predator species to convert the biomass of food into population production. In this study, we firstly applied it 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 DW/m2. GGE of A. valida exponentially reduced with body size and was closely associated with water temperature. Thus, 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 86.68.4-1549.05 g DW/m2 by the sum of consumption (P/GGE) by A. valida at different size, accounting for 2.02-37.50% of U. lactuca production. It indicates that A. valida fails to limit the U. lactuca growth in Yundang Lagoon. Low abundance of the species and high nutrient loading may be two major reasons for the outbreak of U. lactuca bloom in the lagoon. |
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