Hideaki Nishizawa

1 Introduction The greenhouse effect plays a fundamental role in maintaining habitable conditions on Earth. However, increases in atmospheric greenhouse gas concentrations driven by human activities have enhanced this effect, leading to accelerated global warming. Without effective mitigation, global temperatures are projected to rise substantially (up to 2.7°C) by the end of the century, increasing the frequency and intensity of thermal extremes and posing risks to biodiversity (IPCC 2023).

Abstract Conservation efforts have led to substantial recovery of green turtle (Chelonia mydas) populations globally, yet over- or intensive grazing by these megaherbivores is now degrading seagrass ecosystems. We assessed the impacts of turtle-driven grazing and its feedback on turtle nutritional status and growth at Kume Island, Japan, through a comprehensive study conducted between autumn 2023 and spring 2025.

Conflicts of Interest The authors declare no conflicts of interest. References 1980. “Physiological and Ecological Aspects of Gas Exchange by Sea Turtle Eggs.” American Zoologist 20: 575–583. https://doi.org/10.1093/icb/20.3.575. 1997. “ The Nest Environment and the Embryonic Development of Sea Turtles.” In The Biology of Sea Turtles, edited by P. L. Lutz and J. A. Musick, 83–106. CRC Press. , , and . 2020. “Climate Change and Green Sea Turtle Sex Ratio—Preventing Possible Extinction.” Genes 11, no. 5: 588.