Abstract: In order to investigate the effects of reproductive status on the survival fitness of ovoviviparous fish, the resting metabolic rate (RMR) and faststart escape performance of guppy (Poecilia reticulata) before and after parturition were examined. In addition, the relationships between the preparturition RMR and fecundity, and the parameters of preparturition faststart escape performance and fecundity were also determined. The preparturition RMR was found to be significantly higher than the postparturition RMR (P<0.05), whereas no difference was detected in faststart escape performance before and after parturition (P>0.05). The fecundity was positively related to the preparturition RMR (P<0.05), but had no correlation with the parameters of preparturition faststart  escape performance (P>0.05). The results indicated that the reproduction of guppy increased energy burden. However, as the survival fitnessrelevant parameter, the faststart escape performance was not affected by the reproductive status. These characteristics were hypothesized to be related to the evolutionary strategy of this species.

Key words: reconstruction, tree ring width, climate change, NDVI, Larix chinensis