Reproductive periodicity, localised movements and behavioural segregation of pregnant Carcharias taurus at Wolf Rock, southeast Queensland, Australia

Bansemer, Carley; Bennett, Michael B.

doi:10.3354/meps07741

Cited by 81 publications

(77 citation statements)

References 10 publications

(49 reference statements)

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“…Likewise, male sharks .2 m L t were considered mature, 1.5-2 m L t as subadults and those ,1.5 m L t as juvenile. The size (L t ) of individual sharks was estimated by eye for all four PID surveys and through subsequent analysis of high-resolution images, including those of sharks measured using laser photogrammetry (Bansemer and Bennett 2009;Rohner et al 2011). Accuracy of measurements was assessed to be about AE5%.…”

Section: Photographic-identification (Pid) Surveys and Study Sitesmentioning

confidence: 99%

“…Many female sharks bore mating scars or were obviously pregnant, characterised by markedly distended flanks. However, external recognition of pregnancy was first noticeable from late February (Bansemer and Bennett 2009). To describe the distribution of pregnant and non-pregnant sharks, all individuals seen with mating scars only, seen with mating scars and subsequently observed to be pregnant, or only seen when pregnant were included as 'pregnant sharks'.…”

Section: Photographic-identification (Pid) Surveys and Study Sitesmentioning

confidence: 99%

“…Within Australia, a combination of anecdotal reports from fishers and SCUBA divers, catch records of shark-control programs in Queensland (Qld) and New South Wales (NSW), and passive acoustic-and archival-telemetry and conventional tag-recapture studies have suggested that C. taurus moves northward in the Austral autumn and winter, with a southward movement in spring and summer (Reid and Krogh 1992;Pollard et al 1996;Otway and Burke 2004;Bruce et al 2005), contrary to the pattern of movement in southern Africa (Bass et al 1975;Dicken et al 2006Dicken et al , 2007 and southern America (Lucifora et al 2002). However, this paradigm has been challenged by the demonstration that mating occurs in more northern waters in late spring-early summer, with pregnant C. taurus individuals aggregating at Wolf Rock, Qld (25854.630 0 S, 153811.800 0 E), until about mid-winter, and males leaving the region before the end of summer (Bansemer and Bennett 2009).…”

Section: Introductionmentioning

confidence: 98%

“…The pattern of movements of C. taurus in eastern Australian waters is probably influenced by maturity, sex (Pollard and Smith 2000) and pregnancy status of individual sharks, the latter because females of this species have been shown to exhibit a biennial or triennial reproductive cycle (Bansemer and Bennett 2009). Here, we utilise photo-identification (Bansemer and Bennett 2008, 2010 to determine the timing, magnitude and direction of movement of C. taurus.…”

Section: Introductionmentioning

confidence: 99%

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Sex- and maturity-based differences in movement and migration patterns of grey nurse shark, Carcharias taurus, along the eastern coast of Australia

Bansemer

Bennett

2011

Mar. Freshwater Res.

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Abstract. Photo-identification techniques were used to investigate temporal and spatial distributions of Carcharias taurus (Rafinesque, 1810) in relation to maturity, sex and pregnancy status at 19 sites along Australia's eastern coastline. Of 931 individual sharks identified between 2004 and 2008, 479 were female (271 mature, 208 immature) and 452 male (288 mature, 164 immature). Mature, non-gravid females and mature males were mostly observed in the southern to central parts of this species range, along the eastern coast of Australia, in early summer to early winter. These sharks subsequently moved northward, and mating occurred in late spring to early summer in waters off the coast of northern New South Wales and southern Queensland. Pregnant C. taurus aggregated at Wolf Rock in southern Queensland, at the most northerly part of their known range, from late summer to early winter. These sharks subsequently migrated south to pup in central and southern waters of their range in late winter to late spring. Immature sharks of both sexes moved less than mature sharks, showed no synchronised migration patterns, and were mostly restricted to central and southern waters. The improved understanding of sex-and maturity-based migration of C. taurus provided here should facilitate a conservation strategy appropriate for this species in Australian waters.

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Section: Photographic-identification (Pid) Surveys and Study Sitesmentioning

confidence: 99%

Section: Photographic-identification (Pid) Surveys and Study Sitesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Sex- and maturity-based differences in movement and migration patterns of grey nurse shark, Carcharias taurus, along the eastern coast of Australia

Bansemer

Bennett

2011

Mar. Freshwater Res.

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“…Knowledge on their population dynamics is often limited due to a lack of information on their habitat use within the geographical areas they occupy and traverse (Stevens 2010). For such species, predictable aggregations at specific sites provide unique opportunities to assess population sizes, distribution patterns and, potentially, movement patterns of these otherwise elusive fishes (e.g., Dudgeon et al 2008;Bansemer and Bennett 2009;Holmberg et al 2009). …”

mentioning

confidence: 99%

Population dynamics of the reef manta ray Manta alfredi in eastern Australia

et al. 2014

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The reef manta ray Manta alfredi aggregates at several sites along the east coast of Australia. Photographic identification and mark-recapture methods were used to report on the site affinity, size and structure of this population of M. alfredi. A total of 716 individuals were identified in 1982-2012, including 636 at Lady Elliot Island (LEI), southern Great Barrier Reef. Over 60 % of individuals identified were resighted at least once during the study period. Multiple resightings within and among years imply a high degree of site affinity by individuals to aggregation sites. One individual was sighted 11 times at LEI over a 30-yr period. The sex ratio of this population was significantly biased towards females (1.2:1 female-tomale ratio), and females were more commonly resighted than males. Robust design population models were used to estimate the population size of the winter aggregation at LEI over a 4-yr period. The models estimated up to 456 (95 % CI 399-535) M. alfredi individuals in the population within one winter season and a high annual apparent survival. This study demonstrated that waters around LEI form a key aggregation site for a large portion of the M. alfredi population in east Australian waters.

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Reconstructing the history of the sand tiger shark (Carcharias taurus) in the Mediterranean Sea

Bargnesi

Gridelli²,

Cerrano

et al. 2020

Aquatic Conservation

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Sharks are globally exposed to several anthropogenic threats, which, in many cases, have severely reduced their distribution and have impacted populations. In the Mediterranean Sea, because of its long history of exploitation and the relatively short span of scientific monitoring, reconstructing shark baselines is challenging. Many vulnerable species declined in population abundance and geographic distribution before it was possible to adequately track these changes. Consequently, for many of these species, current conservation assessments are now suffering from a severe case of shifting baseline syndrome, whereby their historical occurrence in the area is questioned. The sand tiger shark (Carcharias taurus) is one of these cases. Characterized by high philopatry, restricted home range, and low interchange between populations, its Mediterranean population may have been severely impacted by the high historical fishing pressure in the region before scientific monitoring began. In this study, the history of the abundance and distribution of C. taurus in the Mediterranean Sea was reconstructed through a comprehensive search of occurrence records in the literature and in museum collections. Between 1810 and 2008, 31 occurrence records and 54 publications provided information on the presence of the species in the area. These records were sparse but systematic over time and indicated occurrence hot spots in the south‐western Mediterranean Sea and in the eastern Adriatic Sea. The presence of ten sightings of juveniles from a total of 18 sightings with length information suggested local parturition. Habitat and extinction models indicate that the area has suitable oceanographic conditions for the occurrence of the species and that the species cannot be considered extinct in the Mediterranean Sea. Our study suggests that there is still hope for the recovery of the species and underlines the crucial role of historical investigations to reconstruct the history of large elasmobranchs in the Mediterranean Sea.

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Reproductive periodicity, localised movements and behavioural segregation of pregnant Carcharias taurus at Wolf Rock, southeast Queensland, Australia

Cited by 81 publications

References 10 publications

Sex- and maturity-based differences in movement and migration patterns of grey nurse shark, Carcharias taurus, along the eastern coast of Australia

Sex- and maturity-based differences in movement and migration patterns of grey nurse shark, Carcharias taurus, along the eastern coast of Australia

Population dynamics of the reef manta ray Manta alfredi in eastern Australia

Reconstructing the history of the sand tiger shark (Carcharias taurus) in the Mediterranean Sea

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