Green Sturgeon ( Acipenser medirostris ) and White Sturgeon ( A. transmontanus ) are closely related species inhabiting the San Francisco Estuary (SFE) and Sacramento River. Both spawn in the Sacramento River. White Sturgeon typically remain within SFE throughout their lives while subadult and adult Green Sturgeon make marine migrations. These broad-scale patterns are known. However, the reach-specific timing of spawning migrations is not, and little is known about seasonal movements of juveniles and subadults. We tagged 41 Green and 160 White Sturgeon with acoustic transmitters (2010–2012). Analyses also included 167 previously tagged sturgeon. Over 300 receivers deployed throughout the Sacramento River, SFE, and nearshore Pacific Coast detected movements. Adult Green Sturgeon moved quickly though SFE to their spawning reach, using the mainstem through the Delta. 5% of spawning Green Sturgeon remained on the spawning reach for over 300 days. White Sturgeon spent significantly less time in their spawning reach before exiting (32 ± 48.2 days vs. 197 ± 97.3 days) and instead selected northern Delta sloughs over the mainstem for pre-spawning migrations. Even at earlier life stages, Green Sturgeon had more marine distributions than White Sturgeon. Juveniles and subadults of both species moved between the San Francisco Bay and Delta throughout the year, but only White Sturgeon overwintered in the Delta. Additionally, we refine several life history parameters for sturgeon in California. We provide a comprehensive characterization of Green and White Sturgeon movements within the SFE and Sacramento River across life stages. These analyses will inform reach-specific management of each species.

中文翻译：

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加利福尼亚州旧金山河口和萨克拉门托河中绿鲟 (Acipenser medirostris) 和白鲟 (A. transmontanus) 的时空分布

绿鲟 (Acipenser medirostris) 和白鲟 (A. transmontanus) 是栖息在旧金山河口 (SFE) 和萨克拉门托河的近缘物种。两者都在萨克拉门托河产卵。白鲟通常一生都在 SFE 内，而亚成体和成年绿鲟则进行海洋迁徙。这些广泛的模式是已知的。然而，产卵迁徙的到达特定时间并非如此，并且对幼鱼和亚成鱼的季节性运动知之甚少。我们用声学发射器标记了 41 只绿色和 160 只白鲟鱼（2010-2012 年）。分析还包括 167 条先前标记的鲟鱼。部署在萨克拉门托河、SFE 和近岸太平洋海岸的 300 多个接收器检测到移动。成年绿鲟鱼通过 SFE 快速移动到它们的产卵范围，通过 Delta 使用主干。5% 的产卵绿鲟鱼在产卵区停留了 300 多天。白鲟在离开前在产卵区花费的时间明显更少（32 ± 48.2 天对 197 ± 97.3 天），而是选择了主要茎上的北部三角洲腐肉进行产卵前迁移。即使在生命的早期阶段，绿鲟的海洋分布也比白鲟多。两个物种的幼鱼和亚成鱼全年都在旧金山湾和三角洲之间移动，但只有白鲟在三角洲过冬。此外，我们改进了加利福尼亚鲟鱼的几个生活史参数。我们提供了 SFE 和萨克拉门托河内不同生命阶段的绿色和白色鲟鱼运动的综合特征。