Biodiversity and conservation of sharks in Pacific Mexico

Saldaña-Ruiz, Luz E.; García‐Rodríguez, Emiliano; Pérez‐Jiménez, Juan Carlos; Tovar-Ávila, Javier; Rivera-Téllez, Emmanuel

doi:10.1016/bs.amb.2019.08.001

Cited by 12 publications

(7 citation statements)

References 59 publications

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Section: Discussionmentioning

confidence: 99%

“…Given the scarce knowledge of the species in the northeastern Pacific, future management actions should consider migration timing. In addition to the current understanding of the high coastal residency time, identifying the coastal areas used by young smooth hammerhead sharks should be set as priority (Gallagher & Klimley, 2018; Nagelkerken et al, 2015; Saldaña‐Ruiz et al, 2019). Although shark landings are dominated by small‐size artisanal fisheries in the studied region, medium‐size and large‐size fisheries targeting offshore ecosystems (occupied by larger smooth hammerhead sharks) have increased over the years (Sosa‐Nishizaki et al, 2020).…”

Section: Discussionmentioning

confidence: 99%

“…different sizes selected by the gear regardless of its mesh size; Braccini et al, 2022). This calls for stringent regional management like spatial closures for fisheries in the form of ‘Fishing Refuge Zones’ under the Mexican jurisdiction (Diario Oficial de la Federación, 2014; Saldaña‐Ruiz et al, 2019; Sosa‐Nishizaki et al, 2020).…”

Section: Discussionmentioning

confidence: 99%

“…To what extent such large-scale fisheries could, in the future, overcome the fishing effort of coastal ecosystems will also be important Braccini et al, 2022). This calls for stringent regional management like spatial closures for fisheries in the form of 'Fishing Refuge Zones' under the Mexican jurisdiction (Diario Oficial de la Federación, 2014; -Ruiz et al, 2019;Sosa-Nishizaki et al, 2020).…”

Section: Discussionmentioning

confidence: 99%

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Mercury isotope clocks predict coastal residency and migration timing of hammerhead sharks

Besnard

Lucca

Shipley

et al. 2023

Journal of Applied Ecology

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1. The management of migratory taxa relies on the knowledge of their movements.Among them, ontogenetic habitat shift, from nurseries to adult habitats, is a behavioural trait shared across marine taxa allowing resource partitioning between life stages and reducing predation risk. As this movement is consistent over time, characterizing its timing is critical to implement efficient management plans, notably in coastal areas to mitigate the impact of fisheries on juvenile stocks.2. In the Mexican Pacific, habitat use of the smooth hammerhead shark (Sphyrna zygaena) is poorly described, while the species is heavily harvested. Given the large uncertainties associated with the timing of out-migration from coastal nursery grounds to offshore waters prior to reproductive maturity, a more precise assessment of smooth hammerhead shark movements is needed.3. Photochemical degradation of mercury imparts mass-independent isotope fractionation (Δ 199 Hg) which can be used to discriminate between neonate coastal shallow habitats and the offshore deep foraging patterns of late juveniles. Here, we present the application of muscle Δ 199 Hg as molecular clocks to predict the timing of ontogenetic habitat shifts by smooth hammerhead sharks, based on their isotopic compositions at the initial and arrival habitats and on muscle isotopic turnover rate. 4. We observed decreases in Δ 199 Hg values with shark body length, reflecting increasing reliance on offshore mesopelagic prey with age. Coastal residency estimates indicated that smooth hammerhead sharks utilize coastal resources for 2 years prior to offshore migration, suggesting a prolonged residency in these ecosystems. 85 0.31 ± 0.20 115 (112-118) 390 (382-396)

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

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Mercury isotope clocks predict coastal residency and migration timing of hammerhead sharks

Besnard

Lucca

Shipley

et al. 2023

Journal of Applied Ecology

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“…The members of the Carcharhinidae family include around 12 genera and 50 species, distributed worldwide in both tropical and temperate marine waters. This study focused on 25 carcharhinid sharks that inhabit the waters of Mexico and other areas of the world (Castro, 2011;Saldaña-Ruiz et al, 2019). Of these, 16% are categorized as vulnerable (VU), 52% as near threatened (NT), 16% as data deficient (DD) and 4% as not evaluated (NE) by the International Union for Conservation of Nature (IUCN, 2020).…”

Section: Introductionmentioning

confidence: 99%

Evaluation of Shifts in the Potential Future Distributions of Carcharhinid Sharks Under Different Climate Change Scenarios

et al. 2022

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Climate change is currently considered one of the main phenomena affecting marine species through expansion or contraction of their distribution. Being ectothermic organisms, sharks of the family Carcharhinidae could be highly susceptible to the effects of climate change. These sharks are of great ecological importance, which is reflected in their role in the integrity of coastal and oceanic ecosystems as top predators that act to maintain the stability of the food chain, as well as providing economic value through fishing, consumption, and ecotourism. Currently, their populations are threatened by fishing pressure and anthropogenic activities, including meeting the demand for shark fins. Despite the ecological and economical importance of carcharhinid sharks, knowledge regarding how they are impacted by climate change remains scarce. Ecological niche modeling is a tool that allows analysis of future potential distributions under different climate change scenarios and could contribute to future planning activities and improved conservation outcomes for sharks. We generated models in Maxent in order to predict the potential geographic distribution of 25 carcharhinid sharks that inhabit Mexican waters, projecting this onto future climate change scenarios (RCP2.6, RCP4.5, RCP6.0, and RCP8.5) to calculate the potential losses and gains in their distribution areas by the year 2050. The greatest shifts in suitable areas were observed for the sharks Triaenodon obesus (gained area) and Carcharhinus porosus (lost area). Overall, under all four RCP future scenarios, six species presented gains in suitable area and 19 species presented losses. The greatest loss of suitable area for carcharhinid sharks was found with RCP8.5; however, under this high-emissions global warming scenario, seven species actually showed an increase in distribution area. Our results therefore indicate that climate change could reduce suitable areas for most of the species by 2050. Assessment of the distribution of shark species under climate change is urgently required in order to prioritize conservation efforts toward the most vulnerable species and to ensure the natural function of marine ecosystems, thus maintaining the important ecosystem services they provide to human society.

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The Espiritu Santo Island as a critical area for conserving batoid assemblage species within the Gulf of California

González-González

Mejía‐Falla

Navia³

et al. 2021

Environ Biol Fish

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Biodiversity and conservation of sharks in Pacific Mexico

Cited by 12 publications

References 59 publications

Mercury isotope clocks predict coastal residency and migration timing of hammerhead sharks

Mercury isotope clocks predict coastal residency and migration timing of hammerhead sharks

Evaluation of Shifts in the Potential Future Distributions of Carcharhinid Sharks Under Different Climate Change Scenarios

The Espiritu Santo Island as a critical area for conserving batoid assemblage species within the Gulf of California

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