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Discovery of a putative scalloped hammerhead shark Sphyrna lewini (Carcharhiniformes: Sphyrnidae) nursery site at the Galapagos Islands, Eastern Tropical Pacific

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Abstract

Sphyrna lewini is a viviparous shark that pups in shallow coastal waters. Given dramatic declines in the S. lewini Eastern Pacific population, it is essential to identify nursery grounds that could potentially increase the resilience of adult populations. Here, we provide evidence of a putative nursery ground for S. lewini at an oceanic island in the Galapagos Marine Reserve. A fortuitous finding of hammerhead shark pups in 2017 led to a series of focused surveys from 2018 onwards, using experimental fishing, baited remote underwater videos stations (BRUVS), and acoustic telemetry, to assess presence and residency patterns of this species at Puerto Grande: a shallow bay at the island of San Cristobal. We caught 66 individuals, of which we measured 54 (mean TL = 52.13 cm). Four individuals were fitted with ultrasonic tags and were detected on an array of 14 receivers in the bay for up to 93 days, showing a high residency index of at least 89%. We actively tracked a single individual for 3 h at night and a further hour a week later. Our results suggest that Puerto Grande is a key habitat for the development of the critically endangered S. lewini.

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Acknowledgements

We thank the Galapagos National Park Services for institutional support and research permits (PC-34-17, PC-24-18, PC-13-19, and PC-64-20) that include approval for animal handling methods. Thanks to the Galapagos Science Center — Universidad San Francisco de Quito (GSC-USFQ) for institutional support. We thank the Galapagos Conservation Trust, National Marine Aquarium/Ocean Conservation Trust, The Rufford Small Grants for Nature Conservation, Prince Albert Foundation Grant through the Galapagos Conservation Trust, Galapagos Science Center POA Research Grants, and internal COCIBA Grants at USFQ for funding and support. We also thank the Fulbright Program and Monterey Bay Aquarium for the support of SJJ. The crew of the M/S Sea Quest and M/S Cormoran, Capitan Mauricio Hidalgo, provided indispensable support. Special thanks to Federico Idrovo-Bermeo, Kevin Cabrera, Henrry Vivanco, Cisne Zambrano, to all assistants, volunteers, and Galapagos National Park Wardens, for their invaluable knowledge and effort during the field and logistics.

Funding

This research was funded by the Galapagos Conservation Trust, National Marine Aquarium/Ocean Conservation Trust, The Rufford Foundation, Prince Albert II of Monaco Foundation Grant through Galapagos Conservation Trust, Galapagos Science Center POA Research Grants, and internal COCIBA Grants at Universidad San Francisco de Quito. Salvador Jorgensen was supported by the Fulbright Program and Monterey Bay Aquarium.

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YC-P participated in the fieldwork, data collection, data analysis, and is the main writer of the manuscript. ÁP and LG participated in the fieldwork, data collection, and review of the manuscript. FC and VP participated in the fieldwork and data collection. MY participated in the fieldwork and data collection and provided local information and experience. SJ provided guidance and participated in the field and data collection and review of the manuscript. DA participated in the fieldwork and data collection. DP participated in the fieldwork, data collection, and review of the manuscript. AH developed the study design, provided funding, participated in the fieldwork and data collection, provided supervision, organization, and review of the manuscript.

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Correspondence to Yasuní Chiriboga-Paredes.

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The methods used in this study were approved under research permits PC-34–17, PC-24–18, PC-13–19, and PC-64–20 and issued by the Galapagos National Park Directorate.

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Chiriboga-Paredes, Y., Palomino, Á., Goodman, L. et al. Discovery of a putative scalloped hammerhead shark Sphyrna lewini (Carcharhiniformes: Sphyrnidae) nursery site at the Galapagos Islands, Eastern Tropical Pacific. Environ Biol Fish 105, 181–192 (2022). https://doi.org/10.1007/s10641-021-01207-3

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