两种鲑鱼的产卵栖息地特征与河流大小的重叠：纵向物种更替的 redd 叠加假说,Canadian Journal of Fisheries and Aquatic Sciences

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两种鲑鱼的产卵栖息地特征与河流大小的重叠：纵向物种更替的 redd 叠加假说
Canadian Journal of Fisheries and Aquatic Sciences ( IF 1.9 ) Pub Date : 2023-02-15 , DOI: 10.1139/cjfas-2022-0237
Daisuke Togaki ₁ , Ayaka Sunohara ₁ , Mikio Inoue ₁

Affiliation

加拿大渔业和水产科学杂志，印刷前。
Redd 叠加，由一个后来的产卵者在前一个产卵者的 redd 上产卵，降低了前一个产卵者的繁殖成功率。因此，在redd叠加频繁发生的溪流中，晚产卵物种比早产卵物种具有竞争优势。我们假设上游较小的河道由于产卵栖息地的可用性较低而具有较高的 redd 叠加潜力，从而为晚产卵物种提供竞争优势，以解释本地 masu 鲑鱼（Oncorhynchus masou ishikawae）被非原生白斑点鲑 (Salvelinus leucomaenis)（晚产卵鱼）特有于日本河流的小上游。我们检查了 (1) 产卵栖息地的可用性和 (2) 在具有不同渠道大小的溪流中两个物种之间的产卵栖息地特征重叠。结果表明，(1) 上游的栖息地可用性随着河道尺寸的减小而减少，(2) 小河道中两个物种的产卵栖息地特征高度重叠，而大河道中两个物种的产卵栖息地特征显着不同，支持我们的假设. 我们的结果为鲑鱼竞争优势的纵向变化提供了新的视角。而在较大的通道中，这两个物种之间存在显着差异，支持我们的假设。我们的结果为鲑鱼竞争优势的纵向变化提供了新的视角。而在较大的通道中，这两个物种之间存在显着差异，支持我们的假设。我们的结果为鲑鱼竞争优势的纵向变化提供了新的视角。

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Overlap in spawning habitat characteristics between two salmonids in relation to stream size: redd superimposition hypothesis on longitudinal species replacement

Canadian Journal of Fisheries and Aquatic Sciences, Ahead of Print.
Redd superimposition, spawning on a previous spawner's redd by a later spawner, reduces reproductive success of the previous spawner. Therefore, in streams where redd superimposition frequently occurs, late-spawning species have a competitive advantage over early-spawning species. We hypothesised that smaller channels of upper reaches would have higher potential of redd superimposition owing to lower availability of spawning habitat, thereby providing a competitive advantage to late-spawning species, to explain a displacement of native masu salmon (Oncorhynchus masou ishikawae) by non-native white-spotted char (Salvelinus leucomaenis) (late spawner) specific to small upper reaches in a Japanese river. We examined (1) the availability of spawning habitat and (2) overlap in spawning habitat characteristics between the two species in streams with different channel size. The results showed that (1) the habitat availability decreased upstream as channel size decreased, and (2) characteristics of spawning habitat highly overlapped between the two species in small channels, whereas those differed significantly between the two species in larger channels, supporting our hypothesis. Our results provide a new perspective on longitudinal changes in competitive advantages in salmonids.

更新日期：2023-02-16

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