Complex effects of food abundance on the salinity tolerance of Brachionus plicatilis
Due to the complexity of the marine environment,the status of some ecological factors often fluctuates.To elucidate whether the tolerance of Brachionus plicatilis to differential salinity levels changes under different food abundance conditions,this study combined five salinity levels(3,5,20,30,and 45)with different abundances of Phaeocystis globosa to simulate a series of diverse food conditions experienced by rotifers in their natural envi-ronment and recorded the changes in rotifer life history parameters.The results showed that except for survival time,the developmental time and reproductive capacity of rotifers were significantly affected by the interaction between salinity and food abundance.At all salinity levels,when the abundance of P.globosa was low,the time required for rotifer development and maturation was significantly prolonged,and reproductive capacity was significantly inhib-ited.However,this limiting effect was exponentially recovered to normal values at their respective salinity levels with an increased abundance of P.globosa.Regardless of food conditions,at a salinity level of 20,the first repro-duction time of rotifers was the shortest,and the total offspring was the highest,followed by treatment at a salinity level of 30.Rotifers in the other three salinity levels(3,5,and 45)were significantly negatively affected,and an increase in food abundance could,to some extent,alleviate the negative effects of low and high osmotic environ-ments on rotifer reproduction.Considering the life history parameters of rotifers under different salinity levels and abundances of P.globosa,a trade-off was evident between the lifespan and reproduction of rotifers,and this trade-off was more pronounced at suitable salinity levels(20 and 30).These findings have important guiding sig-nificance for accurately evaluating the comprehensive performance of zooplankton in changing environments.
Brachionus plicatilisPhaeocystis globosasalinityfood abundancelife history
万方数据
维普
