Golfo Dulce: critical habitat and nursery area for juvenile scalloped hammerhead sharks Sphyrna lewini in the Eastern Tropical Pacific Seascape

Zanella, Ilena; López-Garro, Andrés; Cure, Katherine

doi:10.1007/s10641-019-00907-1

Cited by 20 publications

(16 citation statements)

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“…Esta crítica situación está relacionada con los grandes rangos de movimiento de esta especie. Los estudios de telemetría en la región han demostrado que los tiburones martillo se mueven por todo el POT, entre las islas oceánicas (Bessudo et al, 2011), los montes submarinos (Chávez et al, 2020) y las zonas costeras para tener a sus crías (Quintanilla et al, 2015;Salinas-de-León et al, 2017;Bessudo y Ladino, 2019;Zanella et al, 2019). Esto resalta la necesidad de implementar corredores biológicos protegidos entre las islas del POT (Grüss et al, 2011;Migramar, 2016) y la importancia de identificar y proteger las áreas de crianza de las especies.…”

Section: Resultsunclassified

“…This critical situation is related to the large ranges of movement of this species. Telemetry studies in the region have proved that hammerhead shark move around the whole ETP, between oceanic islands (Bessudo et al, 2011), submarine mountains (Chávez et al, 2020), and coastal areas to have their offspring (Quintanilla et al, 2015;Salinas-de-León et al, 2017;Bessudo and Ladino, 2019;Zanella et al, 2019). This highlights the necessity of implementing protected biologic corridors between the ETP's islands (Grüss et al, 2011;Migramar, 2016) and the importance of identifying and protecting the breeding areas of the species.…”

Section: Conclusionesmentioning

confidence: 99%

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Volumen 50, numero 1

2021

Bol. Investig. Mar. Costeras

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Section: Resultsunclassified

Section: Conclusionesmentioning

confidence: 99%

Volumen 50, numero 1

2021

Bol. Investig. Mar. Costeras

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“…sardines) have been shown to increase the numbers of sharks in coastal waters (e.g. (Chapman et al ., 2009; Speed et al ., 2010; Bangley et al ., 2018; Zanella, López-Garro and Cure, 2019)). Mobulid rays appear to have very limited usage of coastal habitats, occurring only at aggregation spots of upwelling around islands or seamounts.…”

Section: Discussionmentioning

confidence: 99%

“…There is substantial evidence that elasmobranchs rely on habitat near the continental shelf, with neonates and juveniles showing usage of core nursery grounds and site-attached coastal movements (Stevens et al ., 2005; Garla et al ., 2006; Kinney and Simpfendorfer, 2009). Recent studies have brought to light the unsustainable level of fishing pressure on shark and ray populations in the ETP (Chávez, 2007; Clarke et al ., 2018; Zanella, López-Garro and Cure, 2019).…”

Section: Introductionmentioning

confidence: 99%

Identifying nearshore nursery habitats for sharks in the Eastern Tropical Pacific from fisheries landings and interviews

Angarita¹,

Villate²,

Díaz³

et al. 2021

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The Eastern Tropical Pacific (ETP) comprising the coasts of Costa Rica, Panama, Colombia and Ecuador, represents an area of high marine biodiversity that supports productive fisheries, and acts as an important migratory corridor for many marine species. Despite its biological importance, the ETP is understudied and lacks sufficient data for science-based fisheries management and conservation decision-making. The aim of this study is to consolidate understanding of the current and historical distribution of sharks and mobulid rays in the ETP. We used interviews of coastal community stakeholders to document traditional knowledge of shark and mobulid ray species and distributions. We also analysed small-scale fisheries landings data, where available, to quantify local exploitation patterns and the importance of sharks and rays in small-scale fisheries catches. All shark species landed in the dominant nearshore gillnet fishery show very low mean individuals weights (<5 kg), indicating that the fisheries are dominated by juveniles, captured . Aside from smooth-hounds (Mustelus spp.), the scalloped hammerhead shark, Sphyrna lewini, is the most frequently landed shark species in the region by weight and number, with peaks in abundance between April - July. From 132 interviews in 51 communities across the three countries, and landings data from two small-scale fisheries sites, we identified 41 sites in 12 broad geographical zones as important shark nursery habitats. Of these sites, 68% were associated closely with large mangrove systems of the ETP, highlighting the importance of this habitat for shark life history. No patterns were seen in the occurrence or distribution of mobulid rays in coastal areas. Marine protected areas and responsible fishing zones cover 37% of identified nursery habitats in the ETP, 30% in Costa Rica, 48% in Panama and 30% in Colombia. These findings provide an important indicator of conservation status of sharks in the ETP, and allow for prioritising and informing the work still to do.

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“…RI was defined as the number of days a bull shark was detected within the receiver array, divided by the number of days monitored (i.e. number of days from the tagging date to the last date detections were received for all transmitters) (Espinoza, Farrugia, & Lowe, 2011;Papastamatiou, Friedlander, Caselle, & Lowe, 2010;Zanella, López, & Cure, 2019); RI values range from 0 to 1, with a value of 1 indicating the highest possible residency at the receiver array. The average number of detections per individual tagged shark throughout a daily cycle was plotted using 'ggplot' and 'plyr' packages in R version 3.6.3 (R Development Core Team R, 2014).…”

Section: Discussionmentioning

confidence: 99%

Residency of bull sharks, Carcharhinus leucas (Carcharhiniformes: Carcharhinidae), at San Pedrillo Islet in Islas Murciélago, North Pacific of Costa Rica

López-Garro

Zanella

2021

Rev. Biol. Trop.

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Introduction: The bull shark, Carcharhinus leucas, is particularly vulnerable to anthropogenic actions because of its permanence in coastal ecosystems; populations depletion is registered in different places around the world. Aggregations of bull sharks have been reported in the North Pacific of Costa Rica, at Islas Murciélago, within the Guanacaste Conservation Area. Objective: To study the residency of bull sharks at San Pedrillo islet, Islas Murciélago. Methods: During the study period (June 2013 to February 2015) we used passive telemetry to tag 10 bull sharks. Results: All the sharks tagged were females, they were detected on 59 798 occasions by the acoustic receiver deployed in San Pedrillo. Acoustic signals from tagged sharks were received for a total period of 1 to 229 days (mean = 73.9 ± 71.3 days), with the last detections occurring on 9 January 2015. The Residency Index for each tagged shark across the entire monitoring period ranged from 0.41 to 1.00. The bull shark activity showed a significant pattern throughout the day at the receiver that specifically corresponded with the daily light cycle. Conclusions: This study concludes that San Pedrillo is an aggregation site (cleaning station) for bull sharks (C. leucas), possibly related to reproduction and not feeding behaviors.

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Golfo Dulce: critical habitat and nursery area for juvenile scalloped hammerhead sharks Sphyrna lewini in the Eastern Tropical Pacific Seascape

Cited by 20 publications

References 30 publications

Volumen 50, numero 1

Volumen 50, numero 1

Identifying nearshore nursery habitats for sharks in the Eastern Tropical Pacific from fisheries landings and interviews

Residency of bull sharks, Carcharhinus leucas (Carcharhiniformes: Carcharhinidae), at San Pedrillo Islet in Islas Murciélago, North Pacific of Costa Rica

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