Energy metabolism fuels swimming and other biological processes.We compared the swimming performance and energy metabolism within and across eight freshwater fish species.Using swim tunnel respirometers,we measured th...Energy metabolism fuels swimming and other biological processes.We compared the swimming performance and energy metabolism within and across eight freshwater fish species.Using swim tunnel respirometers,we measured the standard metabolic rate(SMR)and maximum metabolic rate(MMR)and calculated the critical swimming speed(Ucrit).We accounted for body size,metabolic traits,and some morphometric ratios in an effort to understand the extent and underlying causes of variation.Body mass was largely the best predictor of swimming capacity and metabolic traits within species.Moreover,we found that predictive models using total length or SMR,in addition to body mass,signicantly in creased the explained variation of Ucrit and MMR in certain fish species.These predictive models also underlined that,once body mass has been accounted for,Ucrit can be independently affected by total length or MMR.This study exemplifies the utility of multiple regression models to assess within-species variability.At interspecific level,our results showed that variation in UcriX can partly be explained by the variation in the interrelated traits of MMR,finen ess,and muscle ratios.Among the species studied,bleak Al burn us alburnus performed best in terms of swimming performance and efficiency.By contrast,pumpkinseed Lepomis gibbosus showed very poor swimming performance,but attained lower mass-specific cost of transport(MCOT)than some rheophilic species,possibly reflecting a cost reduction strategy to compensate for hydrod yn amic disadvantages.In con elusion,this study provides insight into the key factors in fluenci ng the swimming performa nee of fish at both intra-and in terspecific levels.展开更多
基金the Spanish Ministry of Science,Innovation and Universities(projects CGL2013-43822-R and CGL2016-80820-R,AEI/FEDER/EU)and the Government of Catalonia(ref.2017 SGR 548).F.R.-G.was benefitted from a predoctoral fellowship from the University of Girona(IFUdG17).
文摘Energy metabolism fuels swimming and other biological processes.We compared the swimming performance and energy metabolism within and across eight freshwater fish species.Using swim tunnel respirometers,we measured the standard metabolic rate(SMR)and maximum metabolic rate(MMR)and calculated the critical swimming speed(Ucrit).We accounted for body size,metabolic traits,and some morphometric ratios in an effort to understand the extent and underlying causes of variation.Body mass was largely the best predictor of swimming capacity and metabolic traits within species.Moreover,we found that predictive models using total length or SMR,in addition to body mass,signicantly in creased the explained variation of Ucrit and MMR in certain fish species.These predictive models also underlined that,once body mass has been accounted for,Ucrit can be independently affected by total length or MMR.This study exemplifies the utility of multiple regression models to assess within-species variability.At interspecific level,our results showed that variation in UcriX can partly be explained by the variation in the interrelated traits of MMR,finen ess,and muscle ratios.Among the species studied,bleak Al burn us alburnus performed best in terms of swimming performance and efficiency.By contrast,pumpkinseed Lepomis gibbosus showed very poor swimming performance,but attained lower mass-specific cost of transport(MCOT)than some rheophilic species,possibly reflecting a cost reduction strategy to compensate for hydrod yn amic disadvantages.In con elusion,this study provides insight into the key factors in fluenci ng the swimming performa nee of fish at both intra-and in terspecific levels.
