Residency and diel movement patterns of the endangered scalloped hammerhead <scp><i>Sphyrna lewini</i></scp> in the Revillagigedo National Park

Aldana-Moreno, Alejandro; Hoyos-Padilla, Mauricio; González‐Armas, Rogelio; Galván‐Magaña, Felipe; Hearn, Alex; Klimley, A. Peter; Winram, William; Becerril‐García, Edgar E.

doi:10.1111/jfb.14239

Cited by 17 publications

(12 citation statements)

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“…The National Park of Revillagigedo Archipelago is relevant for the conservation of sharks, rays and chimaeras (DOF, 2018) since it constitutes a refuge for threatened species caught in fisheries such as the scalloped hammerhead S. lewini and the silky shark Carcharhinus falciformis Müller & Henle 1839 (Aldana‐Moreno et al ., 2019). However, specific actions regarding research or management of chondrichthyans of the archipelago is still scarce since there are few scientific papers related to these species (Aldana‐Moreno et al ., 2019; Becerril‐García et al ., 2019). The generation of baselines, along with research involving the effects of ecotourism in habitat use and bioenergetics of elasmobranchs, should be considered since Revillagigedo Archipelago is mainly used by recreational SCUBA divers and the information regarding anthropogenic affectations is still scarce (Cisneros‐Montemayor et al ., 2020).…”

Section: Figurementioning

confidence: 99%

“…This archipelago is formed by four islands: Roca Partida, San Benedicto, Clarion and Socorro. In the recreational diving sites of these islands, approximately 400 dives were carried out using SCUBA for several scientific projects in a depth range of 10–50 m over 14 years (2006–2020; Aldana‐Moreno et al ., 2019; Becerril‐García et al ., 2019).…”

Section: Figurementioning

confidence: 99%

Section: Figurementioning

confidence: 99%

“…However, specific actions regarding research or management of chondrichthyans of the archipelago is still scarce since there are few scientific papers related to these species (Aldana-Moreno et al, 2019; Becerril-García et al, 2019). The generation of baselines, along with research involving the effects of ecotourism in habitat use and bioenergetics of elasmobranchs, should be considered since Revillagigedo Archipelago is mainly used by recreational SCUBA divers and the information regarding anthropogenic affectations is still scarce (Cisneros-Montemayor et al, 2020).Although the presence of some species such as the white shark or the bigeye thresher is rare for recreational divers, their occurrence could be linked to the use of this archipelago for feeding or as cleaning stations as has been observed in other species(Aldana- Moreno et al, 2019). Future research in this MPA should include the analysis of deep-sea chondrichthyans, as Revillagigedo Archipelago could be relevant for their habitat use and sustainable management(Cerutti-Pereyra et al, 2018).…”

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confidence: 99%

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Sharks, rays, and chimaeras of the Revillagigedo National Park: An update of new and confirmed records

Becerril‐García

Hoyos-Padilla

Henning

et al. 2020

Journal of Fish Biology

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The Revillagigedo Archipelago National Park is the largest no-take Marine Protected Area in North America and it is essential for the conservation of globally endangered marine megafauna, including cetaceans, sea birds and cartilaginous fishes. The present paper reports the occurrence of 28 chondrichthyan species, including 19 sharks, seven batoids and two chimaeras in the Revillagigedo Archipelago, comprising eight new records and a brief revision of confirmed species to date. K E Y W O R D S biodiversity, chondrichthyes, conservation, deep sea, fisheries, marine park, MPA Marine Protected Areas (MPAs) have proved to be effective for the management of oceanic and coastal ecosystems (Lester et al., 2009).

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Section: Figurementioning

confidence: 99%

Section: Figurementioning

confidence: 99%

Section: Figurementioning

confidence: 99%

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Sharks, rays, and chimaeras of the Revillagigedo National Park: An update of new and confirmed records

Becerril‐García

Hoyos-Padilla

Henning

et al. 2020

Journal of Fish Biology

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“…Pelagic sharks spend considerable periods of time on the high seas, in areas beyond national jurisdiction (Queiroz et al, 2019), where there are limited legal frameworks to protect them (Wright et al, 2019). However, electronic tagging indicates some pelagic shark species exploit their environment in predictable ways (Block et al, 2011;Lea et al, 2015;Doherty et al, 2017) or show residency to certain sites or features (e.g., Jorgensen et al, 2010;Queiroz et al, 2016;Carlisle et al, 2019;Aldana-Moreno et al, 2020) providing target areas for effective management. Yet, existing studies into pelagic shark spatial ecology are taxonomically and geographically biased.…”

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confidence: 99%

Behavior and Ecology of Silky Sharks Around the Chagos Archipelago and Evidence of Indian Ocean Wide Movement

et al. 2020

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Silky sharks (Carcharhinus falciformis) represent a major component of global shark catch, both directly and as bycatch, and populations are declining as a result. An improved understanding of their movement ecology is needed to support conservation efforts. We deployed satellite and acoustic tags (2013–2018) and analyzed historical fisheries records (1997–2009), to investigate the spatial ecology of silky sharks in the central Indian Ocean and a large Marine Protected Area (MPA; 640,000 km2) around the Chagos Archipelago. We observed high fidelity to the MPA, and a sustained diurnal association with a seamount complex, with individuals moving off at night and returning at sunrise. Yet, we also observed large-scale divergent movements in two satellite tagged individuals and documented the furthest recorded displacement distance for a satellite tagged silky shark to date, with one individual moving from the MPA to the Kenyan coast—a displacement distance of 3,549 km (track distance ∼4,782 km). Silky sharks undertook diel vertical migrations and oscillatory diving behavior, spending > 99% of their time in the top 100 m, and diving to depths of greater than 300 m, overlapping directly with typical deployments of purse seine and longline sets in the Indian Ocean. One individual was recorded to a depth of 1,112 m, the deepest recorded silky shark dive to date. Individuals spent 96% of their time at liberty within water temperatures between 24 and 30°C. Historic fisheries data revealed that silky sharks were a major component of the shark community around the archipelago, representing 13.69% of all sharks caught by longlines before the fishery closed in 2010. Over half (55.88%) of all individuals caught by longlines and purse seiners were juveniles. The large proportion of juveniles, coupled with the high site fidelity and residence observed in some individuals, suggests that the MPA could provide considerable conservation benefits for silky sharks, particularly during early life-history stages. However, their high mobility potential necessitates that large MPAs need to be considered in conjunction with fisheries regulations and conservation measures in adjacent EEZs and in areas beyond national jurisdiction.

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Genetic population dynamics of the critically endangered scalloped hammerhead shark (Sphyrna lewini) in the Eastern Tropical Pacific

Harned

Bernard

Salinas‐de‐León

et al. 2022

Ecology and Evolution

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The scalloped hammerhead shark, Sphyrna lewini , is a Critically Endangered, migratory species known for its tendency to form iconic and visually spectacular large aggregations. Herein, we investigated the population genetic dynamics of the scalloped hammerhead across much of its distribution in the Eastern Tropical Pacific (ETP), ranging from Costa Rica to Ecuador, focusing on young‐of‐year animals from putative coastal nursery areas and adult females from seasonal aggregations that form in the northern Galápagos Islands. Nuclear microsatellites and partial mitochondrial control region sequences showed little evidence of population structure suggesting that scalloped hammerheads in this ETP region comprise a single genetic stock. Galápagos aggregations of adults were not comprised of related individuals, suggesting that kinship does not play a role in the formation of the repeated, annual gatherings at these remote offshore locations. Despite high levels of fisheries exploitation of this species in the ETP, the adult scalloped hammerheads here showed greater genetic diversity compared with adult conspecifics from other parts of the species' global distribution. A phylogeographic analysis of available, globally sourced, mitochondrial control region sequence data ( n = 1818 sequences) revealed that scalloped hammerheads comprise three distinct matrilines corresponding to the three major world ocean basins, highlighting the need for conservation of these evolutionarily unique lineages. This study provides the first view of the genetic properties of a scalloped hammerhead aggregation, and the largest sample size‐based investigation of population structure and phylogeography of this species in the ETP to date.

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Residency and diel movement patterns of the endangered scalloped hammerhead Sphyrna lewini in the Revillagigedo National Park

Cited by 17 publications

References 25 publications

Sharks, rays, and chimaeras of the Revillagigedo National Park: An update of new and confirmed records

Sharks, rays, and chimaeras of the Revillagigedo National Park: An update of new and confirmed records

Behavior and Ecology of Silky Sharks Around the Chagos Archipelago and Evidence of Indian Ocean Wide Movement

Genetic population dynamics of the critically endangered scalloped hammerhead shark (Sphyrna lewini) in the Eastern Tropical Pacific

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