Movements of three female silky sharks (<i>Carcharhinus falciformis</i>) as tracked by satellite-linked tags off the Caribbean coast of Cuba

Hueter, Robert E.; Tyminski, John P.; Amargós, Fabián Piña; Morris, John; Abierno, Alexei Ruiz; Angulo, Jorge; Fernández, Noel López

doi:10.5343/bms.2017.1162

Cited by 12 publications

(16 citation statements)

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“…increases in metabolic rates are not met with higher food intake (Pistevos et al, 2015), and this risk will be heightened should environmental perturbations concurrently influence prey availability and abundance. However, the thermal tolerance of requiem and mackerel sharks (Francis and Stevens, 2002;Last and Stevens, 2009;Corrigan et al, 2018;Hueter et al, 2018;Young and Carlson, 2020) may enable them to cope with changing temperatures.…”

Section: Discussionmentioning

confidence: 99%

Future Distribution of Suitable Habitat for Pelagic Sharks in Australia Under Climate Change Models

et al. 2020

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Global oceans are absorbing over 90% of the heat trapped in our atmosphere due to accumulated anthropogenic greenhouse gases, resulting in increasing ocean temperatures. Such changes may influence marine ectotherms, such as sharks, as their body temperature concurrently increases toward their upper thermal limits. Sharks are high trophic level predators that play a key role in the regulation of ecosystem structure and health. Because many sharks are already threatened, it is especially important to understand the impact of climate change on these species. We used shark occurrence records collected by commercial fisheries within the Australian continental Exclusive Economic Zone (EEZ) to predict changes in future (2050-2099) relative to current (1956-2005) habitat suitability for pelagic sharks based on an ensemble of climate models and emission scenarios. Our predictive models indicate that future sea temperatures are likely to shift the location of suitable shark habitat within the Australian EEZ. On average, suitable habitat is predicted to decrease within the EEZ for requiem and increase for mackerel sharks, however, the direction and severity of change was highly influenced by the choice of climate model. Our results indicate the need to consider climate change scenarios as part of future shark management and suggest that more broad-scale studies are needed for these pelagic species.

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Section: Discussionmentioning

confidence: 99%

Future Distribution of Suitable Habitat for Pelagic Sharks in Australia Under Climate Change Models

et al. 2020

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“…We report that tagged silky sharks displayed patterns of diel vertical migration, oscillatory diving behavior and spent > 99% of their time in the top 100 m of the water column, while also diving to depths of greater than 300 m. Our findings are therefore broadly consistent with observations of silky sharks in the Pacific (Musyl et al, 2011b;Hutchinson et al, 2019). Yet, we also observed much deeper dives, with one individual recorded to a depth of 1,112 m, the deepest recorded dive for the species (previously reported at 640 m; Hueter et al, 2018). The vertical distribution and diving behavior of pelagic predatory fishes is typically driven by the need to optimize prey encounter rates and energy expenditure, while remaining within preferred environmental conditions (i.e., temperature, oxygen) (Carey et al, 1990;Klimley et al, 2002;Meyer et al, 2009;Andrzejaczek et al, 2019).…”

Section: Discussionmentioning

confidence: 50%

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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“…The results of the geolocation analyses for S5, B1 and B2 were considered unrepresentative of the horizontal movements exhibited by the three rays and are consequently not presented. Typical geolocation accuracy for both the X‐Tag and MiniPAT are ±1° latitude, ±0.5° longitude but PSAT estimates of geolocation using light‐based methods can be associated with large margins of error in cases where there is not much overall tag displacement (Braun et al ., 2015; Brunnschweiler et al ., 2010; Hueter et al ., 2018; Omori & Fisher, 2017), as was the case for B2 and S5. For B1, although it clearly moved over deep water (see below), the late report confounded the pop‐off location and thus confidence in the track was low.…”

Section: Resultsmentioning

confidence: 85%

First insights into the vertical habitat use of the whitespotted eagle ray Aetobatus narinari revealed by pop‐up satellite archival tags

Brewster

Cahill

Burton

et al. 2020

Journal of Fish Biology

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The whitespotted eagle ray Aetobatus narinari is a tropical to warm‐temperate benthopelagic batoid that ranges widely throughout the western Atlantic Ocean. Despite conservation concerns for the species, its vertical habitat use and diving behaviour remain unknown. Patterns and drivers in the depth distribution of A. narinari were investigated at two separate locations, the western North Atlantic (Islands of Bermuda) and the eastern Gulf of Mexico (Sarasota, Florida, U.S.A.). Between 2010 and 2014, seven pop‐up satellite archival tags were attached to A. narinari using three methods: a through‐tail suture, an external tail‐band and through‐wing attachment. Retention time ranged from 0 to 180 days, with tags attached via the through‐tail method retained longest. Tagged rays spent the majority of time (82.85 ± 12.17% S.D.) within the upper 10 m of the water column and, with one exception, no rays travelled deeper than ~26 m. One Bermuda ray recorded a maximum depth of 50.5 m, suggesting that these animals make excursions off the fore‐reef slope of the Bermuda Platform. Individuals occupied deeper depths (7.42 ± 3.99 m S.D.) during the day versus night (4.90 ± 2.89 m S.D.), which may be explained by foraging and/or predator avoidance. Each individual experienced a significant difference in depth and temperature distributions over the diel cycle. There was evidence that mean hourly depth was best described by location and individual variation using a generalized additive mixed model approach. This is the first study to compare depth distributions of A. narinari from different locations and describe the thermal habitat for this species. Our study highlights the importance of region in describing A. narinari depth use, which may be relevant when developing management plans, whilst demonstrating that diel patterns appear to hold across individuals.

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Movements of three female silky sharks (Carcharhinus falciformis) as tracked by satellite-linked tags off the Caribbean coast of Cuba

Cited by 12 publications

References 0 publications

Future Distribution of Suitable Habitat for Pelagic Sharks in Australia Under Climate Change Models

Future Distribution of Suitable Habitat for Pelagic Sharks in Australia Under Climate Change Models

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

First insights into the vertical habitat use of the whitespotted eagle ray Aetobatus narinari revealed by pop‐up satellite archival tags

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