Figure 1: Study species. (IMAGE) PeerJ Caption A) Diploria labyrinthiformis, (B) Colpophyllia natans, (C) Pseudodiploria strigosa, and (D) Orbicella faveolata. Gametes collected from these species were used in a series of fertilization assays to quantify the influence of sperm concentration, gamete age, and gamete co-incubation time on IVF success. Credit Photo credits: Lars ter Horst. Usage Restrictions Credit must be given to the creator. License CC BY Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.