Using bomb radiocarbon analyses to validate age and growth estimates for the tiger shark, Galeocerdo cuvier, in the western North Atlantic

Kneebone, Jeff; Natanson, Lisa J.; Andrews, Allen H.; Howell, W. Huntting

doi:10.1007/s00227-008-0934-y

Cited by 53 publications

(80 citation statements)

References 22 publications

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“…Furthermore, Natanson et al (2008) reported a difference in growth band counts along an individual vertebral column in the basking shark, a phenomenon that was conspicuous in large sharks and also affects longevity estimates. Therefore, longevity estimates should be validated using techniques such as bomb radiocarbon chronology and tag-recapture analyses (Smith et al 2003;Francis et al 2007;Kneebone et al 2008).…”

Section: Age Estimationmentioning

confidence: 99%

Age, growth and genetic status of the white shark (Carcharodon carcharias) from Kashima-nada, Japan

Tanaka¹,

Kitamura²,

Mochizuki³

et al. 2011

Mar. Freshwater Res.

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Abstract. The white shark, a top predator inhabiting the world's oceans, is an endangered species. However, knowledge of its life-history traits and population structure is still limited. We hypothesised that life-history traits would vary among populations because the species' various habitats are diverse and change through time. Age was estimated by counting growth bands in the centra of white sharks caught in Japan. The von Bertalanffy growth parameters were estimated at L N ¼ 455 cm TL, k ¼ 0.196 year À1 and t 0 ¼ À1.92 years for males and L N ¼ 607 cm TL, k ¼ 0.159 year À1 and t 0 ¼ À1.80 years for females. The growth rate to maturity was higher than that known for individuals from California and South Africa. Male sharks matured at 310 cm TL at 4 years of age and females began to mature at ,450 cm TL and 7 years. The D-loop-region sequences of mitochondrial DNA extracted from Japanese white sharks and GenBank datasets from sharks of California, Australia, New Zealand and South Africa indicate that Japanese white sharks form a monophyletic clade separate from the populations of other regions. The results suggest that unique life-history traits of Japanese white sharks may be caused by genetic differences.

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Section: Age Estimationmentioning

confidence: 99%

Age, growth and genetic status of the white shark (Carcharodon carcharias) from Kashima-nada, Japan

Tanaka¹,

Kitamura²,

Mochizuki³

et al. 2011

Mar. Freshwater Res.

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“…Consistency in location of vertebral sampling is important not only for calculating the relationship between vertebral dimension and body length (Natanson et al 2006, Piercy et al 2006) but also for comparison of band pair count. Though many studies have shown that band pair counts are consistent along the vertebral column (Natanson et al 2002, Joung et al 2004, Kneebone 2005, Bishop et al 2006, Piercy et al 2006 unpubl. data), the results of those studies that do show a difference highlight the need to examine band pair counts along the column of every species aged.…”

Section: Discussionmentioning

confidence: 99%

Ontogenetic vertebral growth patterns in the basking shark Cetorhinus maximus

Natanson¹,

Wintner²,

Johansson³

et al. 2008

Mar. Ecol. Prog. Ser.

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Age and growth of the basking shark Cetorhinus maximus (Gunnerus) was examined using vertebral samples from 13 females (261 to 856 cm total length [TL]), 16 males (311 to 840 cm TL) and 11 specimens of unknown sex (376 to 853 cm TL). Vertebral samples were obtained worldwide from museums and institutional and private collections. Examination of multiple vertebrae from along the vertebral column of 10 specimens indicated that vertebral morphology and band pair (alternating opaque and translucent bands) counts changed dramatically along an individual column. Smaller sharks had similar band pair counts along the length of the vertebral column while large sharks had a difference of up to 24 band pairs between the highest and lowest count along the column. Our evidence indicates that band pair deposition may be related to growth and not time in this species and thus the basking shark cannot be directly aged using vertebral band pair counts.

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“…Despite tiger sharks having a global distribution, vertebral ageing studies of the species have thus far been conducted in Hawaii (De Crosta et al, 1984), the western North Atlantic (Kneebone et al, 2008), the Gulf of Mexico , and off the east coast of South Africa (Wintner and Dudley, 2000). Tiger shark growth has also been assessed through the use of mark-recapture methods in Hawaii (Meyer et al, 2014), western North Atlantic (Natanson et al, 1999;Kneebone et al, 2008), Western Australia (Wirsing et al, 2006), and off Brazil (Afonso et al, 2012), although low rates of recapture and a lack of representation of the species' full size range are generally limiting features of these studies (Meyer et al, 2014).…”

Section: The Tiger Shark (Galeocerdo Cuvier )mentioning

confidence: 99%

“…Tiger shark growth has also been assessed through the use of mark-recapture methods in Hawaii (Meyer et al, 2014), western North Atlantic (Natanson et al, 1999;Kneebone et al, 2008), Western Australia (Wirsing et al, 2006), and off Brazil (Afonso et al, 2012), although low rates of recapture and a lack of representation of the species' full size range are generally limiting features of these studies (Meyer et al, 2014). Despite the ageing methods used, modelled estimates of the growth coefficient, k, and asymptotic total length, L ∞ , appear to be markedly different for tiger sharks in different regions of the world.…”

Section: The Tiger Shark (Galeocerdo Cuvier )mentioning

confidence: 99%

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The biology and ecology of the tiger shark (Galeocerdo cuvier) on the east coast of Australia

Holmes¹

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The tiger shark (Galeocerdo cuvier) (Péron and Lesueur 1822) is the largest of the carcharhinids, with a circumglobal distribution in both tropical and warm temperate coastal and pelagic waters. In the western Pacific, G. cuvier movements are wide-ranging, encompassing the east coast of Australia and south Pacific Islands.Throughout the region, G. cuvier is exposed to a range of commercial, recreational, artisanal and illegal foreign fishery impacts, as both a target and by-product species.Listed as 'near threatened' on the International Union for Conservation of Nature (IUCN) Red List, suitable long term species-specific catch, catch rate and biological data are seldom available for large shark species like G. cuvier, particularly where historical commercial fishery logbook reporting has been poor.Shark control programs targeting large sharks along Australia's east coast have been in operation for over 60 years, using relatively standardised fishing gear in nearshore waters all year round, with historical catch and effort data recorded by shark contractors. Historical catch, catch rate and biological data collected through the Queensland Shark Control Program (QSCP) since 1993 were investigated, which revealed significant declines (p < 0.05) in catch rates of G. cuvier at some tropical and all sub-tropical locations along the Queensland coast. Significant temporal declines in the average size of G. cuvier also occurred at four of the nine locations analysed (p < 0.05), which could be indicative of fishing reducing abundance in these areas. Interannual variability in catches at each location was considerable and warranted careful interpretation with respect to estimating population abundance from these data.Investigation into the spatial and temporal movements of tiger sharks, and how their abundances fluctuate in relation to environmental influences, provided a basis for determining the factors driving this variability.Tiger shark movements were recorded using PAT Mk-10 and SPOT5 electronic tags to investigate G. cuvier spatial dynamics, site fidelity and habitat use off the east coast of Australia. Of the 18 tags deployed, 15 recorded information on depth and/or temperature, and horizontal movements, with tracking times ranging between four and 408 days. Horizontal movements were characterised by combinations of resident and transient behaviour that coincided with seasonal changes in water temperature, with summer migrations from sub-tropical Queensland waters to the southern temperate iii waters of New South Wales (NSW) to exploit the seasonally warm and prey abundant waters. While the majority of movement activity was focused around the continental slope, large-scale migration was evident with one individual moving from offshore Sydney, Australia, to New Caledonia (≈ 1800 km) in 48 days. Periods of tiger shark residency outside of Australia's fisheries management zones highlighted the potential vulnerability of the species to unregulated fisheries, and the importance of crossjurisdictional arrangemen...

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Using bomb radiocarbon analyses to validate age and growth estimates for the tiger shark, Galeocerdo cuvier, in the western North Atlantic

Cited by 53 publications

References 22 publications

Age, growth and genetic status of the white shark (Carcharodon carcharias) from Kashima-nada, Japan

Age, growth and genetic status of the white shark (Carcharodon carcharias) from Kashima-nada, Japan

Ontogenetic vertebral growth patterns in the basking shark Cetorhinus maximus

The biology and ecology of the tiger shark (Galeocerdo cuvier) on the east coast of Australia

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