Aim: Phenotypic plasticity is known as the capacity to change in response to different environmental conditions and if these changes imply reversible transformations, it is known as phenotypic flexibility. This plasticity includes changes in behavior, physiology, morphology, growth, life history and demography. Developmental constraints may place a limit on the degree of plasticity that can evolve in a species such as Pelophylax ridibundus, which breeds only in ephemeral ponds with a variable hydroperiod. Methodology: The presence of Euphlyctis ehrenbergii tadpoles as a competitor depressed Pelophylax ridibundus growth, particularly under low food conditions.
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