Developmental success of sea turtle clutches depends on incubation temperature, which also determines sex ratio of hatchlings. As global temperatures are rising, several studies have proposed mitigation strategies such as irrigation and shading to increase hatching success. Our study expands upon this research and measures the effects of using boxes with different degrees of shade coverage (50%, 80%, and 90%) on sand temperature and water content. Boxes were fully covered with fabric in 2017/2018 (top and sides) but were side open in 2018/2019. We took measurements at olive ridley (Lepidochelys olivacea) and leatherback (Dermochelys coriacea) turtle nest depths (45 and 75 cm) at Playa Grande, Costa Rica. Shading reduced temperature by up to 0.8 °C and up to 0.4 °C at 45 cm and 75 cm, respectively. There were statistically significant differences between shading and control treatments at both depths, but differences between shade treatments were only significant when using side open boxes, possibly due to air flow. Shading had no effect on water content. While the impact of using shaded boxes on temperature was low, the potential impact on primary sex ratios was large. If shading were applied to leatherback clutches, the percentage of female hatchlings could vary by up to 50%, with a maximum difference around the pivotal temperature (temperature with 1:1 sex ratio). Shading can be useful to increase hatching success, but we recommend avoiding it at temperatures within the transitional range (temperatures that produce both sexes), or using it only during the last third of incubation, when sex is already determined. As global warming will likely continue, understanding potential impact and effectiveness of mitigation strategies may be critical for the survival of threatened sea turtle populations.

海龟离合器的发育成功取决于孵化温度，孵化温度也决定了幼体的性别比。随着全球温度的升高，一些研究提出了缓解策略，例如灌溉和遮荫，以提高孵化率。我们的研究在此研究的基础上进行了扩展，并测量了使用不同阴影覆盖度（分别为50％，80％和90％）的盒子对沙子温度和含水量的影响。箱子在2017/2018年（顶部和侧面）完全用织物覆盖，但在2018/2019年侧开。我们在Olive ridley（Lepidochelys olivacea）和棱皮背（Dermochelys coriacea）哥斯达黎加普拉亚格兰德的海龟巢深度（45和75厘米）。遮光在45 cm和75 cm处分别将温度降低了0.8°C和0.4°C。在两个深度处，遮光处理和对照处理之间在统计学上均存在显着差异，但遮光处理之间的差异仅在使用侧开盒时才显着，这可能是由于空气流动造成的。阴影对水分没有影响。尽管使用阴影框对温度的影响很小，但对初次性别比的潜在影响却很大。如果将阴影应用到棱皮背式离合器上，雌性孵化的百分比可能会变化高达50％，并且在关键温度附近（性别比为1：1的温度）会有最大差异。阴影可以提高孵化成功率，但是我们建议您避免在过渡范围内的温度（会产生两种性别的温度）下使用它，或者仅在孵化的最后三分之一（已确定性别）时才使用它。随着全球变暖的可能继续，了解减缓策略的潜在影响和有效性对于受威胁的海龟种群的生存可能至关重要。