旋转海豚(Stenellalongrostris亚种。)占据了几个夏威夷群岛的近岸水域。由于他们的行为模式和遗传隔离,他们容易受到人为威胁。它们的发生和行为都有很好的描述,然而,缺乏关于它们的丰度和存活率的数据阻碍了最佳的保护行动。使用基于设计的照片识别调查,这项研究估计了丰度,表观存活率,通过多态开放稳健设计(MSORD)和POPAN建模,将旋转海豚从O'ahu的Wai'anae海岸迁移。八个季节性野外季节,(两个冬天,spring,夏天,和秋季)每个都包括对研究区域的六次调查,连续两年完成。从最佳拟合模型得出的季节性丰度估计值范围为140(±36.8SE,95%CI84-232)至373(±60.0,95%CI273-509)个体,在冬季最低。MSORD估计的存活率为0.95(±0.02SE),并且是马尔可夫式的临时移民模式。POPAN模型估计超种群规模为633(±78SE,95%CI492-798),反映了在整个研究期间使用研究区域的个体海豚的总数。对O\'ahu和毛伊努伊地区周围和之间的环岛和岛间海豚运动的其他研究可能会揭示O\'ahu/4群岛种群的季节性运动模式和总体丰度。这项工作代表了评估这些高度暴露的海豚的丰度和存活率的首次系统标记-重新捕获工作,为保护和管理提供有价值的见解。
Spinner dolphins (Stenella longirostris subsp.) occupy the nearshore waters of several Hawaiian Islands. Due to their constrained behavioral pattern and genetic isolation, they are vulnerable to anthropogenic threats. Their occurrence and behavior are well-described, yet a lack of data on their abundance and survival rates hinders optimal conservation action. Using design-based photo-identification surveys, this study estimated the abundance, apparent survival, and emigration of spinner dolphins off the Wai\'anae Coast of O\'ahu through multi-state open robust design (MSORD) and POPAN modelling. Eight seasonal field seasons, (two winter, spring, summer, and autumn) each comprised of six surveys of the study area, were completed during two consecutive years. Seasonal abundance estimates derived from the best fitting model ranged from 140 (± 36.8 SE, 95% CI 84-232) to 373 (± 60.0, 95% CI 273-509) individuals and were lowest during winter seasons. The MSORD estimated a survival rate of 0.95 (± 0.02 SE) and a Markovian pattern of temporary emigration. POPAN modelling estimated a super-population size of 633 (± 78 SE, 95% CI 492-798), reflecting the total number of individual dolphins that used the study area during the entire study period. Additional research on circum- and inter-island dolphin movements around and between O\'ahu and the Maui Nui region may shed light on both seasonal movement patterns and overall abundance for the O\'ahu/4-Islands stock. This work represents the first systematic mark-recapture effort to assess the abundance and survival rates of these highly exposed dolphins, providing valuable insights for conservation and management.