Analysis of variability in vertebral morphology and growth ring counts in two Carcharhinid sharks

Piercy, Andrew N.; Ford, Travis S.; Levy, Laura; Snelson, Franklin F.

doi:10.1007/978-1-4020-5570-6_18

Cited by 3 publications

(5 citation statements)

References 6 publications

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“…Vertebral region, vertebra and treatment were all treated as fixed factors. Vertebral radius was included as a covariate in the test among vertebral regions because of significant variability in vertebral morphology (Piercy et al ., ), which was confirmed using a repeated‐measures ANOVA ( F 2, 6 = 10·57, P < 0·01). Thoracic vertebrae do not vary significantly in vertebral radius within individuals ( F 3, 69 = 1·49, P > 0·05); thus, vertebral radius was not included as a covariate in models that only used thoracic vertebrae.…”

Section: Methodssupporting

confidence: 54%

“…The fact that deviations from presumed equivalency are most often attributed to differences in growth rate is of particular interest when considering equivalency among elasmobranch vertebrae. Significant axial variability in vertebral morphology and its effect on age estimates has been assessed in multiple species (Officer et al ., ;Piercy et al ., ; Natanson et al ., ). It is unknown, however, whether differences in vertebral morphology (Piercy et al ., ; Natanson et al ., ) among different regions of the vertebral column affect vertebral chemistry, though vertebral chemistry appears to be consistent within the thoracic region of the vertebral column (Tillett et al ., ; Smith et al ., ).…”

Section: Introductionmentioning

confidence: 99%

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Natural variability and effects of cleaning and storage procedures on vertebral chemistry of the blacktip shark Carcharhinus limbatus

Lewis

Patterson

Carlson

2017

Journal of Fish Biology

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Key methodological assumptions regarding the degree of natural variability and influence of sample handling and storage of elasmobranch vertebral chemistry were assessed using laser-ablation inductively coupled plasma mass spectrometry. Vertebral chemistry of juvenile blacktip sharks Carcharhinus limbatus was examined to identify whether differences existed among different regions of the vertebral column, between thoracic vertebrae of individual fish or within individual vertebrae. Additionally, the effects of bleach exposure and storage in ethanol on vertebral chemistry were compared. No significant variation in vertebral chemistry was found among different regions of the vertebral column or between thoracic vertebrae, but significant differences among transect locations within individual vertebrae were observed. The variation at all three levels appears comparable with published data on sagittal otoliths of bilaterally symmetrical teleost fishes. The experimental assessment of potential treatment effects indicated vertebral chemistry was not significantly affected by bleach or exposure to ethanol. Taken together, these results support the idea that vertebrae taken from the same region of the vertebral column can be treated as equivalent and at least certain elements remain robust to exposure to bleach and ethanol.

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Section: Methodssupporting

confidence: 54%

Section: Introductionmentioning

confidence: 99%

Natural variability and effects of cleaning and storage procedures on vertebral chemistry of the blacktip shark Carcharhinus limbatus

Lewis

Patterson

Carlson

2017

Journal of Fish Biology

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“…Removal of centra from below the first dorsal fin was not practical for fishery-dependent samples because such action would reduce the value of the shark at market. Piercy et al (2006) showed no difference in band counts for vertebrae taken from below the first dorsal fin (VIMS samples) and posterior to the chondocranium (CSFOP and NMFS samples) for Sandbar Sharks in the WNA; therefore, the use of these vertebrae for comparison was likely valid. Vertebrae were frozen and sent to the Virginia Institute of Marine Science.…”

Section: Methodsmentioning

confidence: 94%

Compensatory Growth of the Sandbar Shark in the Western North Atlantic Including the Gulf of Mexico

Romine

Musick²,

Johnson³

2013

Mar Coast Fish

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The number of Sandbar Sharks Carcharhinus plumbeus in the western North Atlantic Ocean has experienced a drastic decline since the early 1980s, reaching a minimum during the early 1990s. Catch rates in the early 1990s were a mere 25% of those during the 1980s. According to several fishery‐independent surveys, the low point in Sandbar Shark abundance followed a period of high exploitation. Growth models fit to age–length data collected from 1980 to 1983 and from 2001 to 2004 were compared to investigate potential changes in parameter estimates that might reveal compensatory responses in the Sandbar Shark population. Statistical differences were found between the model parameters for the two time periods, but the differences in growth rates were minimal. The parameters from the three‐parameter von Bertalanffy growth model for female sharks during the 1980–1983 and 2000–2004 time periods were as follows: L∞ = 188.4 and 178.3 cm FL; k = 0.084 and 0.106; and t 0 = −4.097 and −3.41. For males the growth parameters were as follows: L∞ = 164.63 and 173.66 cm; k = 0.11 and 0.11; and t 0 = −3.62 and −3.33. The estimated age at 50% maturity for female Sandbar Sharks changed from 15 years to 12.49 years between the two time periods. Received December 21, 2012; accepted March 28, 2013

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“…Most elasmobranch age studies do not indicate if band pair counts along the vertebral column were examined; however, this is an important step in determining the usefulness of the vertebrae as an aging structure. 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.…”

Section: Discussionmentioning

confidence: 99%

“…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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Analysis of variability in vertebral morphology and growth ring counts in two Carcharhinid sharks

Cited by 3 publications

References 6 publications

Natural variability and effects of cleaning and storage procedures on vertebral chemistry of the blacktip shark Carcharhinus limbatus

Natural variability and effects of cleaning and storage procedures on vertebral chemistry of the blacktip shark Carcharhinus limbatus

Compensatory Growth of the Sandbar Shark in the Western North Atlantic Including the Gulf of Mexico

Ontogenetic vertebral growth patterns in the basking shark Cetorhinus maximus

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