Porites is a major reef building coral genus within coral reef ecosystems, and massive Porites are known to be comparatively resistant to changes in water temperature and pH, and to other environmental disturbances. Pink pigmentation response has often been reported in massive Porites. In this study, around Okinawa, Japan, we not observed only pink but also purple pigmentation response on massive Porites. As there have been few ecological studies investigating the prevalence of these pigmentation responses, we examined their frequency on massive Porites around Okinawajima Island, and attempted to clarify what factors potentially affect pigmentation responses More than 30 Porites colonies at each of 17 sites were examined between February to April 2015. On the basis of images, pigmentation response patterns, pigmentation response occurrence levels, and the presence of epibionts, algae, and other species of coral, were also recorded for each colony. The prevalence of pink coloration was 42% higher than purple coloration. At two sites (Odo and Oujima) the prevalence and levels of pigmentation response were approximately half than at all other sites (SIMPROF, p<0.01). In addition, there were significant positive correlations between epibionts and pigmentation response. It may be possible that pink and purple coloration are fundamentally different phenomena, although the physiological mechanisms of purple coloration have not been clarified.

多孔岩是珊瑚礁生态系统中建立珊瑚的主要珊瑚礁属，众所周知，大量的多孔岩对水温和pH的变化以及其他环境干扰具有相对的抵抗力。粉红色色素沉着反应经常在大量的多孔陶瓷中被报道。在日本冲绳县的这项研究中，我们不仅观察到了大块的多孔体上的粉红色而且还观察到了紫色的色素沉着反应。由于很少有过生态研究调查这些色素沉着反应的发生率，我们考察了大量的频率滨周围Okinawajima岛，并试图澄清哪些因素可能影响色素沉着应对超过30张滨在2015年2月至2015年4月期间，检查了这17个地点中每个地点的菌落。根据图像，还记录了每个菌落的色素沉着反应模式，色素沉着反应发生水平以及表皮动物，藻类和其他珊瑚的存在。粉色的患病率比紫色的患病率高42％。在两个地点（大户和大岛），色素沉着反应的发生率和水平约为所有其他地点的一半（SIMPROF，p <0.01）。此外，表皮动物与色素沉着反应之间存在显着的正相关。尽管尚未弄清楚紫色的生理机制，但粉红色和紫色可能是根本不同的现象。