2019
DOI: 10.1111/jfb.14160
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Resource use of great hammerhead sharks (Sphyrna mokarran) off eastern Australia

Abstract: Great hammerhead sharks Sphyrna mokarran are the largest member of Sphyrnidae, yet the roles of these large sharks in the food webs of coastal ecosystems are still poorly understood. Here we obtained samples of muscle, liver and vertebrae from large S. mokarran (234-383 cm total length; L T ) caught as by-catch off eastern Australia and used stable-isotope analyses of δ 15 N, δ 13 C and δ 34 S to infer their resource use and any associated ontogenetic patterns. The results indicated large S. mokarran are apex … Show more

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Cited by 46 publications
(49 citation statements)
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“…Samples were dried at 60 • C for at least 48 h, then ground into a fine powder using a Retsch MM200 ball mill 1 . Sphyrna mokarran samples were lipid-and urea-extracted to prevent those components from affecting stable isotope values (Carlisle et al, 2016), as per the methods described in Raoult et al (2019).…”
Section: Stable Isotope Analysismentioning
confidence: 99%
See 1 more Smart Citation
“…Samples were dried at 60 • C for at least 48 h, then ground into a fine powder using a Retsch MM200 ball mill 1 . Sphyrna mokarran samples were lipid-and urea-extracted to prevent those components from affecting stable isotope values (Carlisle et al, 2016), as per the methods described in Raoult et al (2019).…”
Section: Stable Isotope Analysismentioning
confidence: 99%
“…Genetic studies on S. mokarran indicate they perform widespread migrations across territorial waters (Guttridge et al, 2017), which makes identifying their geographic range necessary to prioritize effective conservation areas. Off eastern Australia, S. mokarran is caught by bather-protection gillnets (Sumpton et al, 2011;Broadhurst and Cullis, 2020) and fisheries (Roff et al, 2018) in diminishing relative abundances from Cairns, North Queensland (∼17 • S) to Woolongong, New South Wales (NSW) (∼34 • S) (Raoult et al, 2019). Their apparent rarity off NSW has led to S. mokarran being regionally listed as Vulnerable (Rigby et al, 2019).…”
Section: Introductionmentioning
confidence: 99%
“…This species can form large aggregations of up to thousands of individuals within 200 m of the beach (Kajiura & Tellman, 2016). With a maximum length of ~2 m, C. limbatus is both an agile predator of teleost fishes, cephalopods and crustaceans (Castro, 2011; Compagno, 1984) and a prey for larger sharks, such as the great hammerhead, Sphyrna mokarran (Rüppell 1837) (Raoult et al ., 2019). Sphyrna mokarran can reach a maximum length of ~5.5 m, although adults only occasionally exceed 4 m (Castro, 2011; Compagno, 1984).…”
Section: Figurementioning
confidence: 99%
“…Despite their large size, they are often found in relatively shallow waters, such as tidal flats (<1.5 m), that are likely an important area for their feeding (Roemer et al ., 2016). The prey of S. mokarran typically includes batoids, teleosts and other sharks (Mourier et al ., 2013; Raoult et al ., 2019; Roemer et al ., 2016), so it is no surprise that S. mokarran have been spotted in and around the C. limbatus aggregations, which provide an abundance of possible prey.…”
Section: Figurementioning
confidence: 99%
“…A key assumption of SIA is that the isotopic composition of a tissue represents the dietary sources of carbon (through the δ 13 C signature) (DeNiro & Epstein, 1978) and the relative trophic position at which an organism feeds (through the δ 15 N signature) (DeNiro & Epstein, 1981). Further, SIA of tissues with different turnover rates allows for a broader temporal view of a species’ feeding habits (Raoult et al ., 2019). Previous studies suggest that for elasmobranchs, muscle tissue provides an integrated signal representative of total ingested dietary items over a year or more (Kim et al ., 2012b; Vander Zanden et al ., 2015).…”
Section: Introductionmentioning
confidence: 99%