Influence of artificial heating and competitive interactions on larval life history traits

Life history traits of newt larvae, Ichthyosaura alpestris and Lissotriton vulgaris, exposed to natural and artificially heated thermal conditions, and various intra- and interspecific population densities in experimental mesocosm. The data provided information on seven life-history traits, i.e. 1) larval survival rate = surviving larvae after 30 days / initial number of larvae (mean value per tank); 2) somatic growth rate (mm day-1) = (final total length - initial total length) / days of development; 3) differentiation rate = <em>e</em>ln(developmental stage attained) - ln(days of development); 4) injury rate = number of injured larvae / number of surviving larvae after 30 days development; 5) survival rate to metamorphic emergence = number of emerged individuals / number of larvae after 30 days development; 6) time to emergence = number of days between larvae entering the tank and emergence of terrestrial individuals (median value per tank); and 7) mass at emergence = body mass of emerged individuals (mean value per tank).