data files available upon request Variables photo_number Label: Photo Number Definition: unique id of photo Type: Nominal Missing values: None specified Variables (legacy): Treatment Label: Nitrogen Treatment Levels Definition: Varying levels of Nitrogen treatments added directly to the pitcher plants. Type: Code list Codes: Control = 4ml distilled water and 0.5ml of pitcher liquid Low Nitrogen = 3.5ml of Amonium Nitrate and 0.5ml of pitcher liquid High Nitrogen = 3.5ml of Amonium Nitrate ( triple strength) and 0.5ml of pitcher liquid Nitrogen Deprivation = 4ml of distilled water Missing values: None specified , Date Label: Date Definition: The day on which the sample was taken. Type: Date/time Date format: MM/DD/YYYY Missing values: None specified , Total pixels Label: Total pixels Definition: The number of pixels counted from a digital photograph of the selected area on the pitcher plant hood. Type: Nominal Missing values: None specified , Red pixels Label: Red pixels Definition: The number of pixels counted from a digital photograph of the selected mean area on the pitcher plant hood with a tolerance of 127 or 67. Type: Nominal Missing values: None specified , Comments Label: Comments Definition: Each treatment contained a tolerance of either 127 or 67, which was used to determine the most accurate range of red values for comparison. Type: Nominal Missing values: None specified , Plant Number Label: Plant Number Definition: The number that corresponds to plants numbered 1-30. Type: Nominal Missing values: None specified
