Limited information exists about the temporal residency patterns of marine predators, especially at the individual level. Temporal partitioning of resources can reduce intra-specific competition, but this has seldom been examined in predators in marine ecosystems. Here, we used 8 years of acoustic telemetry data from 27 receivers deployed in a large coastal embayment to examine the temporal residency of 51 Port Jackson sharks (Heterodontus portusjacksoni), during their breeding season. We found that the residency lengths of male and female Port Jackson sharks on breeding reefs differed throughout the breeding season, with males showing longer residency at the start of the season and females showing longer residency at the end of the season. Port Jackson sharks also showed a 24-h or diel periodicity in their detection patterns. Although the majority of individuals were nocturnal, a small proportion of sharks was detected more frequently during the day, possibly to reduce competition for resources. Surprisingly, there was no difference in the sex ratio nor the size of diurnal and nocturnal individuals. This study provides long-term insight into the temporal residency patterns of mesopredatory sharks at a breeding site and, more broadly, our results highlight the importance of studying temporal variation at the individual level in movement ecology studies.

关于海洋捕食者的时间居住模式的信息有限，尤其是在个体层面上。资源的时间划分可以减少种内竞争，但是很少在海洋生态系统的捕食者中对此进行检查。在这里，我们使用了来自27个接收器的8年声遥测数据，这些接收器部署在一个大型沿海隔离区内，以检查51个杰克逊港鲨鱼（Heterodontus portusjacksoni），在繁殖季节。我们发现，整个繁殖季节，雄性和雌性杰克逊港鲨鱼在繁殖礁上的居留时间都不同，雄性在本赛季开始时显示较长的居留时间，而雌性在本赛季结束时显示较长的居留时间。杰克逊港鲨鱼的检测方式也显示出24小时或diel周期性。尽管大多数人是夜行性行为，但白天白天发现鲨鱼的频率更高，这可能会减少对资源的竞争。令人惊讶的是，性别比和昼夜个体的大小均无差异。这项研究提供了对中生鲨鱼在繁殖地点的暂时居留模式的长期洞察，更广泛地说，