Germination Strategy Of Brachionus(Rotifer) Resting Eggs Under Predation Risk

Formation and germination of resting eggs are two important stages in Brachionus rotifer life history, since germination and germination patterns change due to environmental changes are resting eggs will change rotifer population dynamics have a significant impact. Allozyme technical findings confirmed the existence of a single nest mesh rotifer multi sibling species, cloning genetic composition between significantly different.However extremely little research attention, calyciflorus between same genotype clone rotifer resting eggs produced by the existence of a high variation ? In addition, in aquatic ecosystems, for the prey, the predator is an important selection pressure, but few studies have extremely concerned at the risk of predation rotifer resting eggs germination strategy. Studies have shown that resting eggs in cladocerans under predation risk by following germination strategies to improve population fitness:(1) Delay germination(by a long period of time formula germination stage to reduce the probability of encounters with predators).(2) Early germination(dormant eggs concentrated in a short time a lot of germination, to improve the survival chances of some individuals in the population). However, the risk of predation impact on rotifer resting eggs produced in the germination process rarely be concerned. In addition studies have shown that maternal effects also have a significant effect on the anti-predator strategies that can increase offspring fitness. Therefore, in this study by herbivores calyciflorus rotifer(Brachionus calyciflorus) and predatory BU's Asplanchna rotifers(Asplanchna brightwelli) these two model organisms to study under predation risk B. calyciflorus. rotifer resting eggs germination strategy and research mainly in the following aspects:(1) B. calyciflorus. rotifer resting eggs under predation risk germination strategy is how?(2) Would maternal effects influence the rotifer resting eggs germination strategy of B. calyciflorus.?(3) B. calyciflorus. rotifer resting eggs germination strategy is to improve the population's fitness will be?The results showed that:(1) Different clone speciesof the same genotype, germination in the same environment, their germination rate and germination patterns there is a high variability, and between different genotypes in different populations and germination strategies, take some explosive germination germination, and some may take two betting strategies(coefficient of variation Max = 37.89%, the coefficient of variation Min = 7.13%).(2) In addition to predation risk calyx flower no B. calyciflorus. resting eggs germination rate significantly affected(P> 0.05), but it can affect predation risk resting eggs germination mode, in the absence of predation risk, B. calyciflorus.rotifer resting egg-stage tend to germinate.and predation under risk B. calyciflorus.rotifer resting eggs tend explosive germination.However, the maternal effect forresting eggs germination strategy no significant impact.(3) The germination pattern of population fitness affect results show that: In predation risk, the germination of dormant eggs explosive population policy can improve fitness, showed higher resting egg production, and this increases fitness food at lower concentrations more significantly(BJ-a: P prey = 0.019; BJ-b: P prey = 0.018). Overall, seed germination among different clones within the same genotype have a higher policy differences, can significantly affect predation risk B. calyciflorus. rotifer resting eggs germination strategies, the performance of resting eggs germination patterns change, and maternal effect for the germination of dormant eggs policy had no effect.