 Abstract, this study examined the impacts of environmental conditions on telomer length in two species of corals. It was found that the short-lived, more stress-sensitive persilipora SPP colonies had shorter telomers than the long-lived, more stress-resistant porites SPP colonies. However, both species showed similar responses to seasonal temperatures. In contrast, the long-lived porites SPP colonies were not affected by seasonal temperatures, but instead were influenced by past thermal anomalies. This suggests that the two species have different mechanisms for maintaining their telomers, with the short-lived persilipora SPP being more sensitive to environmental conditions. This research highlights the importance of understanding how environmental factors affect telomer length in order to better understand the effects of climate change on organismal performance. This article was authored by Alice Ruin, Melanie Pouse, Nadir Jirbhai, and others.