Summary
Energy stress during the breeding season and relationships between calling activity and growth were investigated in male carpenter frogs, Rana virgatipes. This species has a prolonged breeding season of up to three months in Southern New Jersey. Monthly collections made in 1985 revealed that both dry mass and percent body lipid decreased throughout the breeding season but sharply increased at the end of the breeding season. Observations of free-living males showed that small males were more likely to gain mass than large males during the breeding season. All males gained mass at higher rates after the breeding season. A simultaneous record of calling activity and mass change was obtained for 42 males. Males called on 95% of nights, indicating that they rarely ceased their reproductive activities. Small males tended to have low calling efforts and high growth rates. When the effect of initial mass was removed, growth rate was negatively correlated with calling effort among small males. This is the first demonstration of a direct tradeoff between a reproductive activity and growth in an anuran.
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Given, M.F. Growth rate and the cost of calling activity in male carpenter frogs, Rana virgatipes . Behav Ecol Sociobiol 22, 153–160 (1988). https://doi.org/10.1007/BF00300564
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DOI: https://doi.org/10.1007/BF00300564