Most of the studies on sea turtle nesting activity nowadays are focused on the impacts of climate change. However, there is a lack of studies gathering knowledge about the influence of coastal vulnerability to erosion and settlement to assess sea turtle nesting. This study aims to verify the influence of coastal erosion vulnerability over sea turtle nesting in five Brazilian Northeast beaches, in Pernambuco state, at Ipojuca coast. The main analyzed parameters were the urban settlement, coastal erosion indicators and the conservation status of the dunes by assessing shoreline change rates, backshore extension, vegetation cover and beaches morphodynamics associated aspects. Spearman’s rank correlation coefficient and tests of Kruskal–Wallis, Mann–Whitney, Shapiro–Wilk and Levene were employed as a set of statistical analyses. The results state that Eretmochelys imbricata is the predominant species that nests at the Ipojuca coast (93.2% of nesting females). There is a significant difference in the number of nests among the studied beaches (Kruskal–Wallis; p = 0.004). A strong and positive correlation between the backshore width and the number of nests was verified (Spearman’s rank correlation, rs = 0.881; p = 0.0002). The results indicate the preference for nesting on wave-dominated beaches, where the coastal reefs are absent and there is a well-developed backshore, mainly due to the lower urban settlement in these areas. Thus, efforts focused on preserving nesting beaches, especially those under high urbanization, are a key factor for sea turtle preservation.

目前关于海龟筑巢活动的大多数研究都集中在气候变化的影响上。然而，缺乏研究收集关于海岸脆弱性对侵蚀和沉降的影响的知识，以评估海龟筑巢。本研究旨在验证海岸侵蚀脆弱性对伊波茹卡海岸伯南布哥州五个巴西东北海滩的海龟筑巢的影响。通过评估海岸线变化率、后岸扩展、植被覆盖和海滩形态动力学相关方面，主要分析参数是城市聚落、海岸侵蚀指标和沙丘的保护状况。斯皮尔曼等级相关系数和 Kruskal-Wallis、Mann-Whitney、Shapiro-Wilk 和 Levene 的检验被用作一组统计分析。结果表明Eretmochelys imbricata是在 Ipojuca 海岸筑巢的主要物种（93.2% 的筑巢雌性）。研究的海滩之间的巢穴数量存在显着差异（Kruskal-Wallis；p = 0.004）。证实了后岸宽度与巢穴数量之间存在很强的正相关（Spearman 等级相关性，rs = 0.881；p = 0.0002）。结果表明，人们更喜欢在波浪主导的海滩上筑巢，那里没有沿海珊瑚礁，后岸发达，这主要是由于这些地区的城市定居点较低。因此，努力的重点是保护筑巢海滩，尤其是那些在高海拔地区的海滩。 城市化是海龟保护的关键因素。