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High rates of consecutive spawning and precise homing in Sakhalin taimen (Parahucho perryi)

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Abstract

The frequency of reproduction and homing success are crucial in determining the lifetime reproductive fitness of iteroparous salmonids. We examined consecutive spawning and homing by Sakhalin taimen (Parahucho perryi), one of the least-studied iteroparous salmonids. The average consecutive return rate was 69.5%, the highest ever reported for an iteroparous salmonid. The consecutive return rates were highest for large spawners, females, and individuals with active inter-tributary movements in the preceding year. We estimated tributary-scale repeat homing rates to be 50–87%, which was significantly higher than expected by chance alone. The repeat homing rates were higher for spawners that entered tributaries with more abundant spawners in the preceding year, which is consistent with the pheromone hypothesis because the abundance of spawners in a tributary is expected to correlate to the concentration of chemical homing cues emanating from offspring in the following year. These extremely high consecutive return and homing rates likely facilitated local adaptation over evolutionary time scales and have contributed to population stability in this river system. These same traits, however, may impede species recovery following habitat restoration efforts within the species historic range (e.g. dam barrier removal or improved passage) due to their limited rate of dispersal.

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Data availability

The datasets generated during this study are available from the corresponding author on reasonable request.

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Acknowledgments

We thank Sean Den Adel, Colden Rand, Nicolas Rand, Matthew Campbell, Julia McMahon, Asahi Sakuma, Marie Zahn, and Megan Whiteside for field assistance, Koichi Osanai for logistical support, and Eishige Komiyama for inspiring us to conduct this research. We also thank Kurt Fausch, Hiroshi Ueda, Olaf Jensen, and Warren Leach for technical assistance on PIT tagging. Matthew Keefer and an anonymous reviewer gave constructive comments that greatly improved the paper.

Funding

Funding for this study came from the National Geographic, Mohammed bin Zayed Conservation Fund, Ocean Park Conservation Foundation Hong Kong, and Sarufutsu Ito Conservation Council.

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Authors

Contributions

Conceived and designed the investigation: M.F. and P.S.R., performed field work: M.F. and P.S.R., analyzed the data: M.F., wrote the paper: M.F. and P.S.R.

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Correspondence to Michio Fukushima.

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Conflict of interest

The authors declare that they have no conflict of interest.

Ethics approval

Fish were collected under the Hokkaido Government permits No. 168 (2016), 201 (2017), and 191 (2018). Fish sampling protocol used in this study was approved by the Animal Care Committee of National Institute for Environmental Studies.

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Fukushima, M., Rand, P.S. High rates of consecutive spawning and precise homing in Sakhalin taimen (Parahucho perryi). Environ Biol Fish 104, 41–52 (2021). https://doi.org/10.1007/s10641-021-01052-4

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  • DOI: https://doi.org/10.1007/s10641-021-01052-4

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