Large estuaries are often highly productive and biodiverse areas of ecological and economical significance. Assessing the movement behavior and space use patterns of mobile organisms in these highly dynamic areas is critical for understanding ecological dynamics within systems. Fine-scale movement data, which is useful for successful species management and conservation, is lacking for ecologically relevant species in many estuarine systems, due to the demands for fine-scale data collection methods and increased use of more passive tracking methods. Six bonnetheads (Sphyrna tiburo) and four bull sharks (Carcharhinus leucas) were tracked within the Apalachicola Bay system using active acoustic telemetry for periods up to 52 h to compare space use patterns and rates of movement across tidal and diel cycles. Tidal and diel periods had significant effects on the rate of movement (ROM) of both species, with increased ROM during crepuscular periods. Movement behavior was likely driven by a combination of optimal foraging strategies, predator avoidance, and abiotic factors. Unique movement behaviors exhibited by mature bonnetheads provide clarity for their high bycatch rates in the Gulf of Mexico shrimp trawl and should be considered during the formulation of conservation and management measures for the species. By comparing simultaneous active and passive acoustic telemetry data from bonnetheads, we determined that ROM has a negative effect on passive acoustic detection success. More investigation into the effects of environmental conditions and movement on detection efficiency is needed as passive telemetry becomes more widely used to study aquatic animal movement.

大型河口通常是具有生态和经济意义的高产和生物多样性区域。评估这些高度动态区域中移动生物的运动行为和空间使用模式对于理解系统内的生态动态至关重要。由于对精细数据收集方法的需求和更多被动跟踪方法的使用，许多河口系统中缺乏对成功管理和保护物种有用的精细运动数据。六头帽头鲨 ( Sphyrna tiburo)和四头牛鲨 ( Carcharhinus leucas)使用主动声学遥测技术在阿巴拉契科拉湾系统内跟踪长达 52 小时，以比较空间使用模式和潮汐和昼夜周期的运动速率。潮汐期和昼夜期对这两个物种的运动速率 (ROM) 有显着影响，黄昏期间 ROM 增加。运动行为可能是由最佳觅食策略、捕食者回避和非生物因素共同驱动的。成熟帽头所表现出的独特运动行为清楚地说明了它们在墨西哥湾虾拖网中的高兼捕率，在制定该物种的保护和管理措施时应予以考虑。通过比较来自发动机罩的同步主动和被动声学遥测数据，我们确定 ROM 对被动声学检测的成功有负面影响。随着被动遥测技术越来越广泛地用于研究水生动物的运动，需要对环境条件和运动对检测效率的影响进行更多调查。