"Family" Identifier for one of five Ciona intestinalis families (Ci2, Ci3, Ci4, Ci5, Ci6) "Replicate" Identifier for the technical replciate of each family at each sulfide concentration "concentration" Sulphide treatment for sulphide concentration (0, 10, 25, 50, 20 uM sulfide) "success" Number of developed individuals counted for the replicate "total" Total number of individuals counted for the replicate "hatching.prop" success/total