When some of the call properties show negative correlation with temperature . Is it necessary to perform temperature correction of such properties ? What are the steps involved in the correction.
Platz and forester, 1988 gives the formula D14 = Damb - (Tamb. -14.0) (-0.0974) . Can we apply our desired temperature here (Eg. 20 °C ? Or is there any better way to perform this correction
Dear Vineeth,
that may depend on the scope of your research. If you are only describing acoustic parameters of a frog call I would suggest you perform no corrections at all, but state the exact environmental temperature at the time the recording was done. If you are doing a comparative study you will have to take into account that call parameters may also change depending on the number of calling males, the time of the night and another series of abiotic and biotic factores you will not be able to control. Until recently there was no review on, let's call it "good practices in call descriptions", but fortunately that has changed now. You may want to ckec out: http://www.mapress.com/j/zt/article/view/zootaxa.4251.1.1
Hi Vineeth,
In the paper
Narins PM (1995) Temperature dependence of auditory function in the frog. In: Advances in Hearing Research (GA Manley, GM Klump, C Köppl, H Fastl, H Oeckinghaus eds.) World Scientific Publishers, Singapore 198-206, the authors present examples of how temperature afects frog call parameters. The following is one example from this paper of how to calculate the effect of a 10 degree C temperature change (the thermal Q10) for a frequency shift of s octaves:
In all frog species tested to date, increasing the temperature results in an upward shift in the CF and a concomitant reduction in CF-threshold of the tuning curves for fibers innervating the amphibian papilla (low- and mid-frequency fibers). In contrast, basilar papilla (high-frequency) fibers appear to have temperature-independent CFs and CF-thresholds.
Temperature induced shifts of CFs varied from 0.08 octaves/degree C for low-frequency fibers to no CF shift for high-frequency BP fibers. The frequency shift/degree C may be expressed as a thermal Q10 dB value to simplify comparisons with other temperature- dependent processes (Eatock and Manley,1981). The thermal Q10 for a frequency shift of s octaves may be calculated by:
Q1O = e**s (10/delta T)ln2 where ** means "raised to the power of."
Hope this is useful,
Peter
PS- If you want just want to compare frog calls recorded at different temperatures, then it is useful to shift all the temporal parameters to a common temperature (say 20 degrees C) for a valid comparison.
- Badges
- Science topic