From February to April 2013, the study team studied various populations of frogs living between 2035 to 3494m above sea level in the eastern Tibetan Plateau. They located breeding ponds at various altitudes, and at each one, obtained a small sample of freshly laid egg clutches.They counted the number of eggs and weighed the clutch to determine egg weight, and approximated egg size from photographs. The data are used to estimate whether maternal investment changes at varying altitudes on the Tibetan Plateau. Investment is assessed by measuring how reproducing females allocated their energy to egg productions of size or number, all characteristics of offspring fitness. Source data on size and volume in log_10 scale have been converted to standard numeric scale.
Format
A data frame with 431 observations on the following 6 variables.
altitudeNumeric, altitude of study site in meters above sea level.
latitudeNumeric, latitude of study site measured in degrees.
clutch.sizeNumeric, estimated number of eggs in clutch.
body.sizeNumeric, length of mother frog who laid the egg clutch in cm.
clutch.volumeNumeric, volume of egg clutch in mm^3.
egg.sizeNumeric, average diameter of an individual egg to the 0.01mm.
References
Chen, W., et al. Maternal investment increases with altitude in a frog on the Tibetan Plateau. Journal of evolutionary biology 26.12 (2013): 2710-2715. https://doi.org/10.1111/jeb.12271