| Factors regulating population dynamics of the amphipod Ampithoe valida in a eutrophic subtropical coastal lagoon |
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| 作者姓名： | ZHENG Xinqing HUANG Lingfeng HUANG Bangqin LIN Yongqing |
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| 作者单位： | Third Institute of Oceanography, State Oceanic Administration;Key Laboratory of the Ministry of Education for Coastal and Wetland Ecosystems, Xiamen University |
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| 基金项目： | Public Science and Technology Research Funds Projects of Ocean under contract No. 201205009-3; Key Sci-Tech Program of Xiamen City under contract No. 35027.20102004. |
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| 摘 要： | Year-round investigations were carried out to address the population dynamics of amphipod Ampithoe valida 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 of A. 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 population 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 population growth of A. 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 production) 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 of A. valida by affecting its food availability. The authors conclude that, in the Yundang Lagoon, the population dynamics of A. valida was mainly controlled by the food availability rather than water temperature.
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| 关 键 词： | Ampithoe valida population dynamics food availability Ulva lactuca the Yundang Lagoon |
| 收稿时间： | 2011/12/26 0:00:00 |
| 修稿时间： | 2012/12/26 0:00:00 |
Factors regulating population dynamics of the amphipod Ampithoe valida in a eutrophic subtropical coastal lagoon |
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| ZHENG Xinqing,HUANG Lingfeng,HUANG Bangqin,LIN Yongqing.Factors regulating population dynamics of the amphipod Ampithoe valida in a eutrophic subtropical coastal lagoon[J].Acta Oceanologica Sinica,2013,32(6):56-65. |
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| Authors: | ZHENG Xinqing HUANG Lingfeng HUANG Bangqin and LIN Yongqing |
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| Institution: | 1.Third Institute of Oceanography, State Oceanic Administration, Xiamen 361005, China;Key Laboratory of the Ministry of Education for Coastal and Wetland Ecosystems, Xiamen University, Xiamen 361005, China2.Key Laboratory of the Ministry of Education for Coastal and Wetland Ecosystems, Xiamen University, Xiamen 361005, China |
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| Abstract: | Year-round investigationswere carried out to address the population dynamics of amphipod Ampithoe valida 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 (12.02×103 ind./m2) in March, but sharply shrunk in July. The monthly variation pattern of A. 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 population 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 population growth of A. 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 production) 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 of A. valida by affecting its food availability. The authors conclude that, in the Yundang Lagoon, the population dynamics of A. valida was mainly controlled by the food availability rather than water temperature. |
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| Keywords: | Ampithoe valida population dynamics food availability Ulva lactuca the Yundang Lagoon |
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