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Influence of density and predators on metamorphic size in Rhinella schneideri tadpoles raised in mesocosm conditions

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Abstract

Amphibians exhibit extreme plasticity in the timing of metamorphosis, and several species respond to water availability, accelerating metamorphosis when their ponds dry. We analyzed the plasticity of the developmental response to water volume in Rhinella schneideri tadpoles. We raised tadpoles in mesocosm. Covariation between body size at metamorphosis and timing of development was positive. Nevertheless, the first approximately 53% of the metamorphoses finishing the cycle required between 34 and 56 days, and the covariation between body size at metamorphosis and timing of development was negative. For these tadpoles, the larval density and the presence of predators did not significantly affect their mass to metamorphosis. Nevertheless, predators affected time to metamorphosis. For the remainder of the tadpoles that reached metamorphosis at > 56 days, the relationship between body size at metamorphosis and timing of development was positive. For these tadpoles, larval density was important for mass at metamorphosis and presence of predators was also important for time to metamorphosis. Two dominant features were observed: (i) approximately 53% of metamorphs had morphological features similar to individuals developing in desiccating ponds, and (ii) the other individuals had morphological characteristics comparable to metamorphs developing in an unchanging environment.

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  1. Centro de Ecología Aplicada del Litoral (CECOAL-CONICET), Ruta 5, Km 2.5, Corrientes, Argentina, C.P. 3400

    Arturo I. Kehr & Valeria I. Gómez

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  1. Arturo I. Kehr
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  2. Valeria I. Gómez
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Correspondence to Arturo I. Kehr.

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Kehr, A.I., Gómez, V.I. Influence of density and predators on metamorphic size in Rhinella schneideri tadpoles raised in mesocosm conditions. Biologia 69, 1417–1424 (2014). https://doi.org/10.2478/s11756-014-0438-9

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