The effect of temperature on rate of egg and larval development in populations of Argia vivida Hagen (Odonata: Coenagrionidae) from habitats with different thermal regimes

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Abstract
The hypothesis was tested that isolated populations of Argia vivida living in habitats with different thermal regimes would show similar rates of egg and larval development when reared at any constant temperature. Eggs from three populations developed and hatched normally over the temperature range 12.5–32.5 °C, but development rates at 15 and 20 °C were faster in a population from a habitat with daily and annual fluctuations in temperature (Deep Creek, Idaho) than in a population from a more stable geothermal regime (Banff, Alberta), which were in turn faster than in a population from a geothermal site with damped annual fluctuations (Albert Canyon, British Columbia). However, differences between slope or intercept values for the regressions of development time on temperature from the three sites were not statistically significant. Growth rates for Deep Creek larvae were also generally higher than for Banff larvae at all temperatures in all instars, but few of these differences were statistically significant. An estimate of 2600 degree-days above 11.25 °C for completion of egg and larval development leads to prediction of a 1-year life cycle at Banff, a 2- or 3-year life cycle at Deep Creek, and a 3-year life cycle at Albert Canyon.

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