The column headings in the excel file 'Rivulus life history data' are described below. River: The river where the Rivulus hartii were collected Community: The community designation where the Rivulus hartii were collected, HP = high predation site, RG = Rivulus/guppy site, and RO = Rivulus-only site Slope: Refers to the slope of the Northern Range Mountains (either north or south) that the river drains Length: Total length (mm) of fish Weight: Wet weight (g) of fish Number_eggs: Number of mature eggs Egg_wt: Average wet weight of mature egg (mg) Reproductive_allotment: Percentage of body weight devoted to reproduction. Calculated as (total dry weight of reproductive tissue / somatic dry weight) x 100 Repro_tissue_wt: Total dry weight of reproductive tissue (mg) Log_no_eggs: Logarithmic transformation of Number_eggs Log_repro_tissue_wt: Logarithmic transformation of Repro_tissue_wt Sqrt_Repro_allotment: Square root transformation of Reproductive_allotment Comments: Indicates outlier individuals