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Tracking repeat spawning anadromous fish migrations over multiple years in a fragmented river suggests philopatry and sex-linked variation in space use

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Abstract

There is limited knowledge of how philopatry influences the spatial ecology of iteroparous anadromous species during their spawning migrations, but this knowledge is important in understanding population responses to interventions such as river reconnection. Here, acoustic telemetry was applied to twaite shad Alosa fallax and hybrids (n = 184) during their freshwater spawning migration, enabling quantification of philopatry across spawning migrations and assessment of the factors affecting space use. Tagged fish moved a median of 7 km day−1. Their migration routes were tortuous (median ratio of total distance moved/upstream extent = 2.8), and included multiple upstream/downstream direction changes (median = 27) over a median freshwater movement distance of 247 km. Females occupied larger core areas than males, but previous spawning experience, body length, tagging status, and introgression with A. alosa did not predict core area size. Seventy-one fish returned a year after tagging, with a median freshwater residency of 33 days. Between years, intra-individual similarity in space use was significantly greater than inter-individual similarity, providing strong evidence of philopatry. These results provide insights into how spawning philopatry and phenotype influence riverine space use in a threatened anadromous species, and have implications for river reconnection efforts.

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Data from this study will be made available upon reasonable request.

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Acknowledgements

The authors acknowledge funding for the purchase of acoustic tags from the UK Department for Environment, Food and Rural Affairs (DEFRA). PD was supported by a match-funded PhD grant from the ‘Unlocking the Severn’ project (Heritage Lottery Fund, Grant/Award Number: HG/15/04573, LIFE Nature Programme Grant/Award Number: LIFE15/NAT/UK/000219), and Bournemouth University. In addition, we acknowledge the expertise of Natalie Angelopolous during the tagging process, as well as the planning and logistical support from staff of the Environment Agency, Natural England, Severn Rivers Trust, and Canal and Rivers Trust, and permission from the landowner at Maisemore Weir. The SNP genotyping was performed at the PGTB (https://doi.org/10.15454/1.5572396583599417E12) with the help of Laure Dubois and Erwan Guichoux.

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Conceived and designed the field experiments: JDB, ADN, JRD, CC, RV, JRB, and PD. Conducted fieldwork: JDB, ADN, JRB, CC, JRD, and PD. Conducted genetic extraction and analysis: OL, SS, PD, DA. Conducted telemetry analysis: PD. Wrote the article: PD. Edited the article: JDB, DA, JRB, ADN, JRD, CC, OL, SS and RV.

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Correspondence to Peter Davies or Jonathan D. Bolland.

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Davies, P., Britton, J.R., Andreou, D. et al. Tracking repeat spawning anadromous fish migrations over multiple years in a fragmented river suggests philopatry and sex-linked variation in space use. Aquat Sci 86, 34 (2024). https://doi.org/10.1007/s00027-024-01048-z

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  • DOI: https://doi.org/10.1007/s00027-024-01048-z

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