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

Chiriboga-Paredes, Yasuní; Palomino, Ángela; Goodman, Lauren; Córdova, Florencia; Páez, Viviana; Yépez, Manuel; Armijos, Daniel; Pazmiño, Diana A.; Hearn, Alex

doi:10.1007/s10641-021-01207-3

Cited by 9 publications

(5 citation statements)

References 29 publications

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“…Neonates of S. lewini are known to occur across the coastlines of the ETP, particularly around the Galapagos Islands, Ecuador, Colombia, Costa Rica, and Mexico (Chiriboga-Paredes et al, 2022;Elizondo-Sancho et al, 2022;Harned et al, 2022;Rodriguez-Arana et al, 2022), with the highest frequency of neonates recorded during the summer months (Klimley, 1987;Corgos and Rosende-Pereiro, 2021). However, the origin of pupping females to each specific nursery remains uncertain, even though it has been proposed that scalloped hammerheads inhabiting the ETP could be philopatric (Hearn et al, 2010;Ketchum et al, 2014;, and that females of this species might use only one calving site per season (Daly-Engel et al, 2012).…”

Section: Discussionmentioning

confidence: 99%

“…Along the ETP, nursery areas for S. lewini have already been identified across coastal areas of the Pacific coasts of central and south America (Alejo-Plata et al, 2007;Zanella et al, 2009;Loor-Andrade et al, 2015;Quintanilla et al, 2015;Robles et al, 2015;Rodriguez-Arana et al, 2022). However, neonates have also been reported in shallow bays of the oceanic islands of Galapagos in Ecuador and Coco Island in Costa Rica (Zanella et al, 2016;Chiriboga-Paredes et al, 2022). Therefore, these oceanic ecosystems may also play an important role in early life stages, and in the connectivity of their populations.…”

Section: Introductionmentioning

confidence: 99%

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Assessment of nursery areas for the scalloped hammerhead shark (Sphyrna lewini) across the Eastern Tropical Pacific using a stable isotopes approach

Páez-Rosas,

Suarez-Moncada,

Arnés-Urgellés

et al. 2024

Front. Mar. Sci.

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The scalloped hammerhead shark (Sphyrna lewini) is one of the most iconic marine species across the Eastern Tropical Pacific (ETP), yet little is still known about its reproductive biology and the origin of their nursery areas, despite a continuous global decline in their populations. Understanding the origin of shark nurseries is a complex task; however, it is known that the obtention of resources in the first stages of life of placental sharks occurs through maternal reminiscence, thus it is possible to infer the origin of the energy that neonates accumulate during their gestation. In this study we assessed the ecological connectivity and nursery ground use by undertaking a stable isotope analysis of carbon (δ13C) and nitrogen (δ15N) in skin samples of neonates S. lewini across much of their distribution in the ETP, including the Galapagos Marine Reserve (GMR). Our isotopic mixing models revealed that the S. lewini neonates found in the GMR, have isotopic information similar to adult females inhabit in the Galapagos archipelago, suggesting that they are direct descendants of the females that inhabit the GMR. While neonates found off the continental coasts of Ecuador and Panama have isotopic signatures like those of adult females inhabiting several locations across the ETP. This work provides insight into the origin of nursery areas used by adult S. lewini that aggregate in large numbers across oceanic islands of the ETP, highlighting the value of isotopic models to generate useful information for the conservation of sharks.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Assessment of nursery areas for the scalloped hammerhead shark (Sphyrna lewini) across the Eastern Tropical Pacific using a stable isotopes approach

Páez-Rosas,

Suarez-Moncada,

Arnés-Urgellés

et al. 2024

Front. Mar. Sci.

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“…The type of bait used to arm BRUVS depends on the availability of what local fishermen catch; therefore, it is generally composed of Indigenous species. Regarding the family Clupeidae, the most common species used is Sardinops sagax [21,23,25,28,32,35,36,46,47,56,63,64,66,68,72,74,81,83,93] for the Scombridae family is Scomber scombrus [33,53,67,79] followed by "tunas" Euthynnus affinis [53], Katsuwonus pelamis [43,71], Thunnus albacares [40], Euthynnus alletteratus [42]. Bait can be composed either of a single species or of mixtures of species and/or their parts: in [88] the bait housing contained a 100 g mixture of minced pilchards (80 g), falafel (10 g) and tuna oil; in [89] baits used to attract sharks included fish scraps, cephalopods, and/or cetacean flesh and oil; in [73] the bait was composed of 500 g of Sardinella brasiliensis and barracuda viscera, Sphyraena barracuda.…”

Section: Implementing Bruvsmentioning

confidence: 99%

Studying Chondrichthyans Using Baited Remote Underwater Video Systems: A Review

Leonetti,

Bottaro,

Giglio

et al. 2024

Animals

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Cartilaginous fish face significant threats due to overfishing and slow reproductive rates, leading to rapid declines in their populations globally. Traditional capture-based surveys, while valuable for gathering ecological information, pose risks to the health and survival of these species. Baited Remote Underwater Video Systems (BRUVS) offer a non-invasive alternative, allowing for standardized surveys across various habitats with minimal disturbance to marine life. This study presents a comprehensive review of BRUVS applications in studying cartilaginous fish, examining 81 peer-reviewed papers spanning from 1990 to 2023. The analysis reveals a significant increase in BRUVS usage over the past three decades, particularly in Australia, South Africa, and Central America. The most common BRUVS configurations include benthic setups, mono-camera systems, and the use of fish from the Clupeidae and Scombridae families as bait. BRUVS have been instrumental in studying 195 chondrichthyan species, providing insights into up to thirteen different aspects of the life histories. Moreover, BRUVS facilitate the monitoring of endangered and data-deficient species, contributing crucial data for conservation efforts. Overall, this study underscores the value of BRUVS as a powerful tool for studying and conserving cartilaginous fish populations worldwide.

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“…The functions of such aggregation behaviors have been hypothesized to include reproduction (Klimley, 1987;Chaikin et al, 2020;Sims et al, 2022), feeding (De-la-Parra-Venegas et al, 2011), energy conservation, (Klimley and Nelson, 1984;Economakis and Lobel, 1998;Hight and Lowe, 2007), refuge from predators (Heupel et al, 2007;McAllister et al, 2017) and social learning (Sih et al, 2009;Brown and Laland, 2011). The formation of these aggregations can be seasonal and is often linked to environmental factors and life history stages (Rohner et al, 2013;Kajiura and Tellman, 2016), food abundance (Clua et al, 2013;Hacohen-Domenéet al, 2015), critical habitats (Oh et al, 2017;Chiriboga-Paredes et al, 2022) and reproduction (Heupel and Simpfendorfer, 2005;Reyier et al, 2008). The seasonality of these aggregation events, along with the large number of individuals at specific areas (i.e., coastal areas, productive systems) can also increase the likelihood and intensity of exposure to anthropogenic threats such as targeted fishing (Litvinov, 2006;Croll et al, 2016), bycatch (Watson et al, 2009;Hall and Roman, 2013), habitat degradation (Cattano et al, 2021), irresponsible tourism (Venables et al, 2016;Zemah-Shamir et al, 2019), boat strikes (Lester et al, 2020;Allen et al, 2021;Womersley et al, 2022) or climate change (particularly if mismatches in the timing of migration, reproduction or foraging interactions occur).…”

Section: Introductionmentioning

confidence: 99%

Manta and devil ray aggregations: conservation challenges and developments in the field

et al. 2023

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Manta and devil rays (mobulids) are filter feeding elasmobranchs with extreme K-selective life histories found circumglobally from temperate to tropical waters. Their vulnerability to fisheries exploitation, bycatch, boat collisions, entanglement and unregulated tourism is exacerbated by their aggregative behavior. Studies have identified aggregation sites around the world for all nine mobulid species, with these groupings varying from a few individuals to thousands. However, the terminology used to define these aggregations and the drivers underpinning them remain unclear, hindering the development of effective management and conservation strategies. Here, we analyze aggregation behavior for mobulid species, providing consistent definitions for grouping events and summarizing the existing research on drivers and environmental factors triggering these events. We find that aggregation behaviors facilitate socializing and key life history functions in mobulids, including feeding, courtship and mating, predation avoidance, cleaning, and thermoregulation. Conservation threats and management mitigation opportunities associated with aggregations sites include fisheries, tourism, spatial protection, and climate change. Finally, we highlight knowledge gaps for future research prioritization and developments in the field for the identification of aggregation sites, the study of aggregation size and demographics and the functions and timing of aggregations.

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

Cited by 9 publications

References 29 publications

Assessment of nursery areas for the scalloped hammerhead shark (Sphyrna lewini) across the Eastern Tropical Pacific using a stable isotopes approach

Assessment of nursery areas for the scalloped hammerhead shark (Sphyrna lewini) across the Eastern Tropical Pacific using a stable isotopes approach

Studying Chondrichthyans Using Baited Remote Underwater Video Systems: A Review

Manta and devil ray aggregations: conservation challenges and developments in the field

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