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Lactate dehydrogenase activity in two cirolanid isopods: the relationship with zonation and motility capacity on sandy beaches

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[In this paper we report lactate dehydrogenase (LDH) apparent specific activity, in two species of cirolanid isopods that inhabit exposed sandy beaches. LDH has been related to burst swimming capacity and we expected higher activities in Excirolana armata (Dana, 1852) since it occupies lower beach levels and is a stronger swimmer than Excirolana braziliensis Richardson, 1912. LDH apparent specific activity was positively correlated to the logarithm of individual wet weight (p (β = 0) < 0.05), ranging from 4.67 to 22.3 μmol min-1 g ww-1 for E. armata and 0.57 to 7.88 μmol min-1 g ww-1 for E. braziliensis. Slopes differed significantly. LDH activity is reduced at basic pH in both species. Vmax and Km for organisms of more than 0.03 g were higher in E. armata (13.36 μmol min-1 g ww-1 and 0.99 mM, respectively) than in E. braziliensis (3.26 μmol min-1 g ww-1 and 0.17 mM, respectively). These results support the positive allometry of anaerobic enzymatic activity/weight at specific level, and suggest that distribution patterns in these organisms could be related to the physiology of locomotion., In this paper we report lactate dehydrogenase (LDH) apparent specific activity, in two species of cirolanid isopods that inhabit exposed sandy beaches. LDH has been related to burst swimming capacity and we expected higher activities in Excirolana armata (Dana, 1852) since it occupies lower beach levels and is a stronger swimmer than Excirolana braziliensis Richardson, 1912. LDH apparent specific activity was positively correlated to the logarithm of individual wet weight (p (β = 0) < 0.05), ranging from 4.67 to 22.3 μmol min-1 g ww-1 for E. armata and 0.57 to 7.88 μmol min-1 g ww-1 for E. braziliensis. Slopes differed significantly. LDH activity is reduced at basic pH in both species. Vmax and Km for organisms of more than 0.03 g were higher in E. armata (13.36 μmol min-1 g ww-1 and 0.99 mM, respectively) than in E. braziliensis (3.26 μmol min-1 g ww-1 and 0.17 mM, respectively). These results support the positive allometry of anaerobic enzymatic activity/weight at specific level, and suggest that distribution patterns in these organisms could be related to the physiology of locomotion.]

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