Blooms of jellyfishes are perceived to have increased during the last decades causing interference with human activities of both recreational and professional type. Those blooms seem to hold correlation with human impacts and environmental changes such as overfishing, the increase of temperature, eutrophication or habitat modification. In this study we perform the first simultaneous analysis of population dynamics from three scyphozoan jellyfishes, Aurelia sp. (Linnaeus, 1758), Cotylorhiza tuberculata (Macri, 1778) and Rhizostoma pulmo (Macri, 1778). The effect of temperature, salinity, ichthyoplankton, nutrients and chlorophyll a concentration have been studied. These three species are present in the Mar Menor coastal lagoon where they show a spatial and temporal segregation of their populations and life cycles that allows them to reduce interspecific competition. Temperature and its seasonal cycle have been determined to be a key factor regulating the populations, triggering the strobilation process either by an increase in temperature (C. tuberculata) or by a decrease in it (Aurelia sp.). Such segregation has a decisive effect on the ecosystem, since it allows a continuous temporal succession of top-down control on the lagoon trophic network.

在过去的几十年中，水母的数量增加了，从而干扰了娱乐性和专业性人类活动。这些花开似乎与人类影响和环境变化有关，例如过度捕捞，温度升高，富营养化或生境改变。在这项研究中，我们进行了首次同时分析来自三种鞘脂水母Aurelia sp的种群动态。（Linnaeus，1758年），Cotylorhiza tuberculata（Macri，1778年）和Rhizostoma pulmo（Macri，1778年）。温度，盐度，浮游鱼类，养分和叶绿素a的影响已经研究了浓度。这三个物种存在于Mar Menor沿海泻湖中，在那里它们表现出种群和生命周期的时空隔离，这使它们能够减少种间竞争。温度及其季节周期已被确定为调节种群的关键因素，它通过温度升高（C. tuberculata）或温度降低（Aurelia sp 。）触发了疏松过程。这种隔离对生态系统具有决定性的影响，因为它允许对泻湖营养网进行自顶向下控制的连续时间连续性。