Capture–mark–recapture (CMR) studies on marine turtle nesting beaches provide data on reproductive periodicity that inform population trends and models. Annual survival is estimated from observations of remigration, the return of females in subsequent nesting seasons. However, a significant proportion of tagged females are never encountered remigrating in many studies, presumably due to weak nest site fidelity (NSF). We employed a genetic CMR approach based on subpopulation-scale clutch sampling to conduct a 5-year evaluation of inter-seasonal recapture rates and NSF for Northern Recovery Unit loggerhead turtles (Caretta caretta). Of 1770 females genetically tagged from Georgia through Maryland in 2010, 1156 (65%) remigrated between 2011 and 2015. Inter-seasonal NSF, measured as shifts in median latitude nesting locations between years, was highly variable among individuals but strong overall (mean: 15.08 (± 44.61) km, median: 1.84 km). Among three focal beaches with nocturnal tagging projects, 69 of 173 females (40%) remigrated onsite whereas 115 (66%) were detected overall. Regional genetic sampling therefore yielded significantly higher inter-seasonal recapture rates, which may improve precision in future survival analyses. However, despite sampling ~ 1000 km with high annual detection probabilities (p* ≥ 0.94), 35% of 2010-females were not detected remigrating. Several non-exclusive hypotheses to explain these remaining “missing” remigrants should be considered: longer remigration intervals, imperfect detection within the study area, emigration to Florida, anthropogenic mortality, and natural mortality or senescence. This genetic tagging approach can be applied over large spatial scales where nesting densities permit, better characterizing inter-seasonal dispersal.

关于海龟筑巢海滩的捕获－标记－捕获（CMR）研究提供了繁殖周期的数据，可为种群趋势和模型提供信息。每年的生存是根据移徙的观察估计的，在随后的筑巢季节中雌性返回。但是，在很多研究中，绝大部分未标记的雌性动物从未移徙，这可能是由于巢位保真度弱（NSF）。我们采用了基于亚种群规模离合器采样的遗传CMR方法，对北方恢复单位的龟（Caretta caretta）进行了为期5年的季节间捕获率和NSF评估。）。在2010年从佐治亚州到马里兰州进行基因标记的1770名女性中，有1156名（65％）在2011年至2015年之间移民。季节间NSF（以年中中纬度巢穴位置的变化来衡量）在个体之间变化很大，但总体上很强（平均值： 15.08（±44.61）km，中位数：1.84 km）。在三个带有夜间标记项目的重点海滩中，有173名女性中有69名（40％）移居现场，而总体上发现了115名（66％）。因此，区域遗传采样产生了明显更高的季节间重新捕获率，这可能会提高未来生存分析的准确性。但是，尽管采样了〜1000 km，并且具有很高的年度检测概率（p*≥0.94），未检测到35％的2010年女性正在迁移。应该考虑几种非排他性的假设来解释这些剩余的“失踪”移民：更长的移民间隔，研究区域内的检测不完善，移民到佛罗里达，人为死亡率以及自然死亡率或衰老。这种遗传标记方法可以在嵌套密度允许的较大空间尺度上应用，可以更好地表征季节间的扩散。