Factors regulating population dynamics of the amphipod Ampithoe valida in a eutrophic subtropical coastal lagoon

作     者：ZHENG Xinqing HUANG Lingfeng HUANG Bangqin LIN Yongqing 

作者机构：Third Institute of Oceanography State Oceanic Administration Key Laboratory of the Ministry of Education for Coastal and Wetland Ecosystems Xiamen University 

出 版 物：《Acta Oceanologica Sinica》 (海洋学报（英文版）)

年 卷 期：2013年第32卷第6期

页      面：56-65页

核心收录：

学科分类：07[理学] 0713[理学-生态学] 

基　　金：Public Science and Technology Research Funds Projects of Ocean under contract No.201205009-3 Key Sci-Tech Program of Xiamen City under contract No.3502Z20102004 

主　　题：Ampithoe valida population dynamics food availability Ulva lactuca the Yundang Lagoon 

摘      要：Year-round investigations were carried out to address the population dynamics of amphipod Ampithoe val- ida and its potential regulating factors in the Yundang Lagoon （a eutrophic subtropical coastal lagoon in Xiamen City, China） from October 2007 to October 2008. The results show that A. valida population was largely composed of juveniles and reached a peak abundance （12.02× 10^3 ind./m2） in March, but sharply shrunk in July. The monthly variation pattern ofA. valida seemed to follow that of Ulva lactuca which is the main food resource for A. valida, indicating a strong influence of food availability on A. valida popu- lation dynamics. Life cycle studies in laboratory indicate that A. valida adopted an r-selected life strategy, e.g., rapid growth rate （0.216-0.302 mm/d）, consecutive breeding （4-10 times）, short reproductive rhythm （9-17 d） and huge fecundity （24-192 eggs or 6-94 juveniles per brood）, which contributed to the fast pop- ulation growth ofA. valida from January to March. Although temperature may also be a significant cause, A. valida could grow quickly and show normal reproductive traits （i.e., the timing of sexual differentiation or maturity, the reproductive rhythm, the number of broods all through its lifespan and offspring produc- tion） in temperature between 15-30~ C. Therefore, the temperature variation in the lagoon water should not account for the sharp variation of A. valida population by affecting the survival, growth and reproduction of the amphipod. However, negative correlation between water temperature and U. lactuca biomass in the lagoon suggested that temperature could have indirectly affected the population dynamics ofA. ualida by affecting its food availability. The authors conclude that, in the Yundang Lagoon, the population dynamics ofA. validawas mainly controlled by the food availability rather than water temperature.