作 者：Zheng, XQ;Huang, LF;Huang, BQ; Lin, YQ.

影响因子：0.747

刊物名称：Acta Oceanologica Sinica

出版年份：2013

卷：32 期：6 页码：56-65

文章摘要：

Year-round investigations were carried out to address the population dynamics of amphipodAmpithoe validaand 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 thatA. validapopulation 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 ofA. validaseemed to follow that ofUlva lactucawhich is the main food resource forA. valida, indicating a strong influence of food availability onA. validapopulation dynamics. Life cycle studies in laboratory indicate thatA. validaadopted anr-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 ofA. validafrom January to March. Although temperature may also be a significant cause,A. validacould 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 ofA. validapopulation by affecting the survival, growth and reproduction of the amphipod. However, negative correlation between water temperature andU. lactucabiomass in the lagoon suggested that temperature could have indirectly affected the population dynamics ofA. validaby 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.

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