Annual spawning migrations by Pacific salmon can provide substantial subsidies to nutrient‐limited freshwater and riparian ecosystems, which can affect the abundance, diversity, and physical characteristics of plant and animal species in these habitats. Here, we provide the first investigation of how salmon subsidies affect reproductive output in plants, focusing on a common riparian shrub, salmonberry (Rubus spectabilis). We studied 14 streams with a range of spawning salmon densities on the central coast of British Columbia, Canada. We determined the effects of chum (Oncorhynchus keta), pink (O. gorbuscha), and total salmon spawning density on the number of fruits per shrub, number of seeds per fruit, fruit weight, and estimated sugar content (° Brix) of salmonberry fruits. We found that the number of fruits per salmonberry shrub increased with increasing salmon density. However, we found no effect of salmon density on the number of seeds per fruit, fruit weight, or sugar content. The effect of salmon density was species‐dependent; the number of fruits per shrub increased with chum salmon density but was not affected by pink salmon density. This could be because chum salmon occur at higher densities and are transferred from water to land at higher rates than pink salmon in our study area. Higher salmonberry fruit production could lead to a larger input of salmonberry fruits to coastal food webs. These results demonstrate how salmon can cross ecological boundaries and influence reproductive output of terrestrial species.

中文翻译：

---

鲑鱼的产卵密度影响鲑鱼的果实产量（Rubus spectabilis）

太平洋鲑鱼每年的产卵迁徙可为营养有限的淡水和河岸生态系统提供大量补贴，这可能会影响这些生境中动植物种类的丰度，多样性和物理特征。在这里，我们将首次研究鲑鱼补贴如何影响植物的繁殖产量，重点研究常见的河岸灌木鲑鱼（Rusus spectabilis）。我们研究了加拿大不列颠哥伦比亚省中部海岸的14条不同产卵鲑鱼密度的溪流。我们确定了chum（Oncorhynchus keta），粉红色（O. gorbuscha）的效果。），以及鲑鱼的总产卵密度，取决于每种灌木的果实数，每种果实的种子数，果实重量以及鲑鱼果实的估计糖含量（°白利糖度）。我们发现，随着鲑鱼密度的增加，每个鲑莓灌木的果实数量增加。但是，我们发现鲑鱼密度对每个果实的种子数，果实重量或糖含量没有影响。鲑鱼密度的影响取决于物种。每个灌木的果实数量随密宗鲑鱼密度的增加而增加，但不受粉红鲑鱼密度的影响。这可能是因为在我们的研究区域内，密宗鲑鱼的密度更高，并且以比粉红鲑鱼更高的比率从水中转移到陆地。沙棘果产量较高可能会导致将沙棘果更多地输入沿海食物网。