Multi-year movements of adult and subadult bull sharks (Carcharhinus leucas): philopatry, connectivity, and environmental influences

Rider, Mitchell J.; McDonnell, Laura H.; Hammerschlag, Neil

doi:10.1007/s10452-021-09845-6

Cited by 16 publications

(12 citation statements)

References 60 publications

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“…These restricted movements likely contributed to the higher predictability and slightly lower entropy scores observed in bull shark trajectories (in comparison to tiger sharks or great hammerheads). Given that bull sharks are generally found in shallow, coastal waters (Ortega et al 2009, Rider et al 2021) the deeper waters between these habitats may reduce bull shark dispersal. Similar residency patterns were also reported by Carlson et al (2010) who attributed this pattern to bull sharks remaining in regions of higher productivity over long periods.…”

Section: Discussionmentioning

confidence: 99%

Comprehensive analytical approaches reveal species‐specific search strategies in sympatric apex predatory sharks

et al. 2021

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Animals follow specific movement patterns and search strategies to maximize encounters with essential resources (e.g. prey, favourable habitat) while minimizing exposures to suboptimal conditions (e.g. competitors, predators). While describing spatiotemporal patterns in animal movement from tracking data is common, understanding the associated search strategies employed continues to be a key challenge in ecology. Moreover, studies in marine ecology commonly focus on singular aspects of species' movements, however using multiple analytical approaches can further enable researchers to identify ecological phenomena and resolve fundamental ecological questions relating to movement. Here, we used a set of statistical physics‐based methods to analyze satellite tracking data from three co‐occurring apex predators (tiger, great hammerhead and bull sharks) that predominantly inhabit productive coastal regions of the northwest Atlantic Ocean and Gulf of Mexico. We analyzed data from 96 sharks and calculated a range of metrics, including each species' displacements, turning angles, dispersion, space‐use and community‐wide movement patterns to characterize each species' movements and identify potential search strategies. Our comprehensive approach revealed high interspecific variability in shark movement patterns and search strategies. Tiger sharks displayed near‐random movements consistent with a Brownian strategy commonly associated with movements through resource‐rich habitats. Great hammerheads showed a mixed‐movement strategy including Brownian and resident‐type movements, suggesting adaptation to widespread and localized high resource availability. Bull sharks followed a resident movement strategy with restricted movements indicating localized high resource availability. We hypothesize that the species‐specific search strategies identified here may help foster the co‐existence of these sympatric apex predators. Following this comprehensive approach provided novel insights into spatial ecology and assisted with identifying unique movement and search strategies. Similar future studies of animal movement will help characterize movement patterns and also enable the identification of search strategies to help elucidate the ecological drivers of movement and to understand species' responses to environmental change.

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Section: Discussionmentioning

confidence: 99%

Comprehensive analytical approaches reveal species‐specific search strategies in sympatric apex predatory sharks

et al. 2021

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“…Although C. leucas is a very common species in some regions, especially in the tropics, for many regions very little is known about its habitats (castro et al 1999). The habitat use of C. leucas has only been intensively investigated in a few regions, for example in the coastal regions of the northern Gulf of Mexico (BlackBurn et al 2007;simPfendorfer et al 2005;froeschke et al 2010a;heuPel et al 2010;Bethea et al 2015;matich et al 2017b;Plumlee et al 2018;matich et al 2020b;rider et al 2021). Investigations by froeschke et al (2010a) have shown that C. leucas (immatures up to 170 cm TL) distributions in estuaries along the Texas coast were most strongly influenced by water parameters such as salinity and temperature, which may be the most determining factors shaping the distribution and abundance of C. leucas in low salinity environments.…”

Section: Aspects Of Habitat Use and Distribution Of Carcharhinus Leucas With Comments On Limiting Factors The Impact Of Natural Events Anmentioning

confidence: 99%

“…In this context, elliott et al (2007) pointed out that in viviparous fish species it is a classical survival strategy to retain the brood in a location with the highest level of protection. Moreover, evidence of reproductive philopatry in C. leucas has been provided (Batcha & reddy 2007;tillett et al 2012;laurraBaquio-alvarado et al 2019;rider et al 2021), whereby adult female individuals show fidelity to a particular nursery and/or breeding site. This emphasises the importance of rivers, river mouths, lakes, estuaries and lagoons as critical nursery and breeding areas for C. leucas, and the importance of a sustainable management of shark fisheries in these coastal inshore ecosystems.…”

Section: Introductionmentioning

confidence: 99%

Synopsis of global fresh and brackish water occurrences of the bull shark Carcharhinus leucas Valenciennes, 1839 (Pisces: Carcharhinidae), with comments on distribution and habitat use

Gausmann¹

2021

Integrative Systematics: Stuttgart Contributions to Natural His

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No. WC Toponym Country (State) References LHS Comments F Neuse River [35.10°N, -76.50°E] USA (NC) schwartz (1995, 1997, 2012); southern fried science (2011); BanGley et al. (2018a, 2018b) Juv Ad Tributary of the Pamlico Sound (No. 9). schwartz (1995) reported C. leucas at New Bern in summer F Cape Fear 14 inteGrative systematics No. WC Toponym Country (State) References LHS Comments F Pearl River-System [30.18°N, -89.57°E]

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“…Moreover, capture‐based fisheries survey methods can have strong intrinsic vulnerability biases to survey gears (Young et al, 2019), and their use as survey methods are highly impactful and therefore unsuitable for protected areas. Meanwhile, passive acoustic monitoring (e.g., Rider et al, 2021) and satellite tracking of tagged individuals (e.g., Queiroz et al, 2019; Vedor et al, 2021) are capable of providing extremely detailed information on space use but, typically, they can only be used for a small number of individuals within a population. In the case of passive acoustic monitoring, it is only possible within the spatial context of a proximate hydrophone (acoustic receiver) array (Lea et al, 2016).…”

Section: Introductionmentioning

confidence: 99%

Environmental DNA captures elasmobranch diversity in a temperate marine ecosystem

et al. 2022

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Many sharks, skates, and rays (elasmobranchs) are highly threatened by the activities of commercial fisheries, and a clear understanding of their distributions, diversity, and abundance can guide protective measures. However, surveying and monitoring elasmobranch species can be highly invasive or resource-intensive, and utilization of non-invasive environmental DNA-based methods may overcome these problems.Here, we studied spatial and seasonal variation in the elasmobranch community of the Western English Channel using environmental DNA (eDNA) collected from surface and bottom waters periodically over an annual cycle (2017)(2018). In total we recovered 13 elasmobranch species within eDNA samples, and the number of transformed eDNA reads was positively associated with species (hourly) catch data resolved from 105-year time series trawl data . These results demonstrate the ability of eDNA to detect and semi-quantitatively reflect the prevalence of historically dominant and rare elasmobranch species in this region. Notably, eDNA recorded a greater number of species per sampling event than a conventional trawl survey in the same area over the same sampling years (2017)(2018). Several threatened species were recovered within the eDNA, including undulate ray, porbeagle shark, and thresher shark. Using eDNA, we found differences in elasmobranch communities among sampling stations and between seasons, but not between sampling depths. Collectively, our results suggest that non-invasive eDNA-based methods can be used to study the spatial and seasonal changes in the diversity and abundance of whole elasmobranch communities within temperate shelf habitats. Given the threatened status of many elasmobranchs in human-impacted marine environments, eDNA analysis is poised to provide key information on their diversity and distributions to inform conservationfocused monitoring and management.

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Multi-year movements of adult and subadult bull sharks (Carcharhinus leucas): philopatry, connectivity, and environmental influences

Cited by 16 publications

References 60 publications

Comprehensive analytical approaches reveal species‐specific search strategies in sympatric apex predatory sharks

Comprehensive analytical approaches reveal species‐specific search strategies in sympatric apex predatory sharks

Synopsis of global fresh and brackish water occurrences of the bull shark Carcharhinus leucas Valenciennes, 1839 (Pisces: Carcharhinidae), with comments on distribution and habitat use

Environmental DNA captures elasmobranch diversity in a temperate marine ecosystem

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