Funding information Columbia River Intertribal Fish Commission; Yakama Nation Fisheries; Confederated Tribes of the Umatilla Indian Reservation Department of Natural Resources; NSF IGERT, Grant/Award Number: #1249400 Abstract 1. Anadromous fish transport marine-derived nutrients to freshwaters during spawning migrations with potential implications for stream food webs. While many studies have explored the role of marine-derived nutrients instream ecosystems (particularly via Pacific salmonids [Oncorhynchus spp.]), relatively few have examined the spatial distribution and patchiness of non-salmonid fish carcasses or rates of transport to the riparian zone. 2. We radio-tagged and released 144 mature Pacific lamprey (Entosphenus tridentatus) prior to spawning and tracked the fate of post-spawn carcasses in two inland Columbia River basin streams to characterise spatial distribution of carcasses and marine-derived nutrient deposition. We found that 27 and 40% of lamprey that could be assigned a fate were moved into the riparian zone adjacent to stream segments exhibiting higher velocity conditions with larger substrates. Conversely, lamprey with instream fates were associated with depositional microhabitats and woody debris dams. Estimated carcass loading rates varied by more than an order of magnitude among habitats. These patterns probably reflect a combination of processes influencing the likelihood of carcass removal (e.g. by predators or scavengers, or stranding) and factors affecting the distribution of carcasses remaining within the stream. 3. Our results demonstrate substantial transport of lamprey carcasses across the stream-riparian ecotone and a non-random distribution of carcasses within streams, patterns which probably influence how resources enter stream and riparian food webs. More broadly, the results suggest local and landscape-scale hydrogeomorphic factors, along with species-specific traits and phenology, affect the distribution and potential roles of fish carrion in stream food webs.

中文翻译：

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带出你的死者：影响太平洋七鳃鳗尸体命运的因素以及向河岸和河流大栖息地的资源运输

资金信息 哥伦比亚河部落间鱼类委员会；Yakama 国家渔业；Umatilla 印第安人自然资源保护部的部落联盟；NSF IGERT，资助/奖项编号：#1249400 摘要 1. 溯河鱼类在产卵洄游过程中将海洋来源的营养物质运输到淡水，对河流食物网有潜在影响。虽然许多研究探索了海洋来源的营养物质在河流生态系统中的作用（特别是通过太平洋鲑鱼 [Oncorhynchus spp.]），但相对较少的研究检查了非鲑鱼尸体的空间分布和斑块状或运输到河岸区的速度。2. 我们在产卵前对 144 只成熟的太平洋七鳃鳗 (Entosphenus tridentatus) 进行了无线电标记和释放，并跟踪了哥伦比亚河流域两条内陆河流中产卵后尸体的命运，以表征尸体的空间分布和海洋衍生的养分沉积。我们发现可以分配命运的 27% 和 40% 的七鳃鳗被移动到靠近河段的河岸区，河段表现出更高的速度条件和更大的底物。相反，具有内流命运的七鳃鳗与沉积微生境和木质碎屑坝有关。估计的尸体装载率在不同栖息地之间的差异超过一个数量级。这些模式可能反映了影响屠体移除可能性的过程的组合（例如，通过捕食者或清道夫，或搁浅）和影响留在溪流中的屠体分布的因素。3. 我们的结果表明，七鳃鳗尸体大量穿过河流-河岸交错带，并且尸体在河流内的非随机分布，这些模式可能会影响资源进入河流和河岸食物网的方式。更广泛地说，结果表明局部和景观尺度的水文地貌因素，连同物种特异性特征和物候，影响鱼腐肉在河流食物网中的分布和潜在作用。