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Population energetics and food limitation in two sympatric species of ranidella anura


, : Population energetics and food limitation in two sympatric species of ranidella anura. Proceedings of the Royal Society of Victoria 99(1-2): 1-12

Two species of anuran amphibians, Randiella signifera and R. parinsignifera, are broadly sympatric in south-eastern Australia. The energetics of sympatric populations of breeding males were evaluated over four years of study. Although areal population respiration and consumption of food in choruses are as great as in populations of hemothermic vertebrates, the localisation of indivduals means that these anuran populations contribute relatively little to energy flow compared with birds or mammals. The ratio of production to respiration in populations of anurans should be intermediate between the analogous ratios in birds and in salamanders, Somatic energy reserve contribute relatively little to energy requirements, so the feeding at breeding sites is essential to finance observed reproductive activity. Standardised measures of reproductive expenditure reveal that males of these species of Ranidella expend about as much on annual reproduction as do females of a variety of small reptiles and amphibians. Comparisons of food avaibility and food requirements indicate that food limitation is likely is to occur in sympatric populations of these species of Ranidella. Despite this, neither food nor microhabitat segregation occurs.

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