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Geographic variation in thermal sensitivity of jumping performance in the frog Limnodynastes peronii

Robbie S. Wilson^*

Physiological Ecology Laboratory, Department of Zoology, The University of Queensland, St Lucia, QLD 4072, Australia

View larger version (54K): [in a new window]   Fig. 1. (A) A striped marsh frog (Limnodynastes peronii) (photograph courtesy of E. Meyer). (B) Distribution of striped marsh frogs along the eastern regions of Australia. Symbols indicate sites where adult animals were collected. (C) Seasonal changes in average nightly temperature at four of the study sites (Australian Bureau of Meteorology).

View larger version (26K): [in a new window]   Fig. 2. Thermal sensitivity of (A) maximum take-off velocity (Umax) and (B) maximum jump distance (DJ), for adult striped marsh frogs (Limnodynastes peronii) from five populations across a wide geographic range. The relationship between temperature and each parameter of jumping performance was significantly different amongst the populations (two-way repeated-measures ANOVA) (P<0.05). Values are means ± S.E.M. (Melbourne, N=12; Gippsland, N=24; Brisbane, N=22; Eungella, N=13; Proserpine, N=14).

View larger version (18K): [in a new window]   Fig. 3. Thermal sensitivity of (A) maximum jumping force (Fmax), (B) maximum jumping acceleration (Amax) and (C) maximum instantaneous jumping power (Pmax) for adult striped marsh frogs (Limnodynastes peronii) from five populations across a wide geographic range. The relationship between temperature and both parameters of jumping performance was significantly different amongst the populations (two-way repeated-measures ANOVA) (P<0.05). Values are means ± S.E.M. (See Fig. 2 for N values.)

View larger version (26K): [in a new window]   Fig. 4. Thermal sensitivity of contact time on the platform during a jump (TC) for adult striped marsh frogs (Limnodynastes peronii) from five populations across a wide geographic range. The relationship between temperature and TC was significantly different amongst the populations (two-way repeated-measures ANOVA) (P<0.05). Values are means ± S.E.M. (See Fig. 2 for N values.)

View larger version (15K): [in a new window]   Fig. 5. Thermal sensitivity of maximum jump distance (DJ) for metamorph striped marsh frogs (Limnodynastes peronii) raised under identical conditions in the laboratory from the cool-temperate Gippsland and lowland tropical Proserpine population. Thermal sensitivity of DJ differed significantly between the two populations (two-way repeated-measures ANOVA) (P<0.05). Values are means ± S.E.M. (Gippsland, N=19; Proserpine, N=13).