Opportunistic camera surveys provide insight into discrete foraging behaviours in nurse sharks (Ginglymostoma cirratum)

Parton, Kristian J.; Doherty, Philip D.; Parrish, Mark D.; Shearer, Philip; Myrick, Keith; Shipley, Oliver N.; Gallagher, Austin J.

doi:10.1007/s10641-022-01366-x

Cited by 5 publications

(2 citation statements)

References 68 publications

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“…SeaGIS EventMeasure software http://www.seagis.com.au), it is possible to estimate different morphometric parameters such as snout-to-first dorsal fin length, dorsal fin-to-precaudal length, fork length (FL), precaudal length (PCL) and total length (TL) [54]. Furthermore, BRUVS provide detailed insights into fish behavior, including inter and intraspecific interactions [16], behavioral change [70], foraging behaviors [77].…”

Section: Informing Conservation Initiativesmentioning

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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Section: Informing Conservation Initiativesmentioning

confidence: 99%

Studying Chondrichthyans Using Baited Remote Underwater Video Systems: A Review

Leonetti,

Bottaro,

Giglio

et al. 2024

Animals

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show abstract

“…While coastal coral reef ecosystems are the focus ( Floros, Samways & Armstrong, 2004 ; Floros, Schleyer & Maggs, 2013 ; Schleyer et al, 2018 ), there is a lack of similar attention on soft sediment areas, which can be valuable to elasmobranchs, particularly to bottom-dwellers ( Pennino et al, 2013 ; Pierce, Scott-Holland & Bennett, 2011 ; Vaudo & Heithaus, 2009 ; Vaudo & Heithaus, 2012 ). For instance, sandy habitats provide sharks with foraging and reproduction areas, and offer juvenile rays important nursery areas ( Martins et al, 2020 ; Parton et al, 2023 ). Thus, understanding the importance of different habitats for shark and ray species can inform conservation management strategies ( Knip, Heupel & Simpfendorfer, 2012 ; White et al, 2015 ).…”

Section: Introductionmentioning

confidence: 99%

Seasonal changes characterise the shark and ray assemblages in a subtropical shallow sandy habitat in the iSimangaliso Wetland Park, South Africa

Ferreira

Alberts²,

Smith³

et al. 2023

PeerJ

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Understanding how environmental drivers influence shark and ray spatial and temporal patterns can provide crucial knowledge for their evidence-based protection and long-term monitoring. However, information on which drivers of variation are most important for elasmobranch communities on soft sediments is limited. Using baited remote underwater stereo-video systems (stereo-BRUVs), we investigated how seasonal and environmental variables affected the elasmobranchs of the iSimangaliso Wetland Park marine protected area (MPA) in South Africa (SA). In total, 11 species were identified from 48 sites between 12 m and 33 m water depth in a sandy habitat. While species richness was similar across seasons, the total abundance of elasmobranchs recorded was higher in winter than summer. The species assemblage composition varied significantly between seasons, with the Human’s whaler shark Carcharhinus humani prevalent in summer and the Critically Endangered whitespotted wedgefish Rhynchobatus djiddensis more abundant during winter. Most species were sighted throughout the entire depth range, but rays were more common in shallower waters (< 25 m depth), while C. humani and R. djiddensis were more common in the deeper depth zone of this study. This research provides baseline information about this previously unexplored sandy habitat for elasmobranchs in a site of regional and global significance. Records of species of conservation concern in the sampling area highlight the importance of protecting sand environments within an MPA.

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Histological comparison of shark dermis across various ecomorphologies

Schuitema,

Motta,

Gelsleichter

et al. 2024

The Anatomical Record

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The integument plays essential roles in the structural support, protection, and hydrodynamic capability among fishes. Most research on shark skin has focused on the external epidermal layer, while the larger dermis anchoring the dermal denticles has been mostly ignored. Shark dermis is composed of two layers, the upper stratum laxum and the lower stratum compactum, holding supportive collagen and elastic fibers. There may be morphological and compositional differences in the dermis across various species of sharks that could relate to their different swimming modes and ecologies. The goal of this study was to characterize and describe the dermis among three shark species, Ginglymostoma cirratum, Sphyrna mokarran, and Isurus oxyrinchus, each representing a different swimming mode. Histological characterizations were performed at 16 locations along the body of each shark; variables such as dermal thickness, abundance of collagen and elastic fibers, and fiber size were quantified. Results showed G. cirratum has the thickest skin overall, and the largest fiber size for both collagen and elastic fibers, with overall patterns of increased amounts of collagen fibers and decreased amount of elastic fibers. At the opposite end of the spectrum, I. oxyrinchus showed the thinnest dermis along the flank region, with overall patterns of increased elastic fibers and decreased collagen fibers. These findings may challenge our original assumptions of a rigid body in fast moving sharks and a more flexible body in slower moving sharks and highlight the diversity of the shark integument.

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Opportunistic camera surveys provide insight into discrete foraging behaviours in nurse sharks (Ginglymostoma cirratum)

Cited by 5 publications

References 68 publications

Studying Chondrichthyans Using Baited Remote Underwater Video Systems: A Review

Studying Chondrichthyans Using Baited Remote Underwater Video Systems: A Review

Seasonal changes characterise the shark and ray assemblages in a subtropical shallow sandy habitat in the iSimangaliso Wetland Park, South Africa

Histological comparison of shark dermis across various ecomorphologies

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