Accuracy Assessment of Skeletochronology in the Arizona Tiger Salamander (Ambystoma Tigrinum Nebulosum)

Eden, Christopher J.; Whiteman, Howard H.; Duobinis-Gray, Leon; Wissinger, Scott A.

doi:10.1643/0045-8511(2007)7[471:aaosit]2.0.co;2

Cited by 38 publications

(34 citation statements)

References 26 publications

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“…In these latter cases skeletochronology would lead to underestimation of the number of countable LAGs, and hence would not be an appropriate aging tool. This problem has also been reported by other skeletochronological studies of amphibians (Eden et al 2007, Wagner et al 2011. The number of LAGs detected in phalanges correlated on a 1:1 ratio between fingers and toes for four of the five species used in this study, and is an indication that the influences on annular growth and resorption/remodeling rates are approximately the same in long bones (see Table 1).…”

Section: Snoutsupporting

confidence: 69%

Crescimento do osso anular de falanges de cinco espécies de anuros neotropicais (Anura: Bufonidae: Atelopus)

Lindquist¹,

Redmer²,

Brantner³

2012

Phyllomedusa

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Annular bone growth in phalanges of five Neotropical Harlequin Frogs (Anura: Bufonidae: Atelopus). Skeletochronological studies were conducted on museum specimens representing five species of the highly threatened Neotropical genus Atelopus (Bufonidae). We detected annular bone growth (expressed as lines of arrested growth [LAGs]) patterns in each species, and this might provide insight to understand demographic constituency in future studies. In four of the five species under consideration, LAG counts in fore and hind limb bone occurred in a 1:1 ratio, indicating that bone growth was consistent within each individual. The use of skeletochronology in understanding historic and existing populations of Atelopus might assist in situ and ex situ population managers in making informed strategic conservation plans.Keywords: age estimation, demographic constituency, lines of arrested growth, skeletochronology. ResumoCrescimento do osso anular de falanges de cinco espécies de anuros neotropicais (Anura: Bufonidae: Atelopus). Estudos de esqueletocronologia foram realizados em amostras representativas de cinco espécies do gênero Neotropical altamente ameaçado Atelopus (Bufonidae). Detectamos crescimento ósseo anular (expresso em linhas de crescimento) em todas as espécies, o que pode oferecer subsídios para entender a estrutura demográfica em estudos futuros. Em quatro das cinco espécies consideradas, as contagens das linhas de crescimento nos ossos dos membros anteriores e posteriores ocorreram em uma proporção de 1:1, indicando que o crescimento do osso foi consistente dentro de cada indivíduo. O uso da esqueletocronologia na compreensão das populações históricas e atuais de Atelopus pode auxiliar os profissionais que trabalham com manejo in situ e ex situ no delineamento de planos de conservação estratégicos bem-embasados.Palavras-chave: esqueletocronologia, estimativa de idade, estrutura demográfica, linhas de crescimento.

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Section: Snoutsupporting

confidence: 69%

Crescimento do osso anular de falanges de cinco espécies de anuros neotropicais (Anura: Bufonidae: Atelopus)

Lindquist¹,

Redmer²,

Brantner³

2012

Phyllomedusa

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“…In addition, nonindependence of recapture data restricts the analysis of a relationship between age and body size (Griffiths and Brook 2005). Thus, within a recent decade, techniques for age determination in that taxon have converged on the most accurate predictor of age, skeletochronology, in which LAGs are counted in bone tissues, although inaccuracies in age estimation may occur because of endosteal resorption of the innermost LAG (Eden et al 2007). …”

Section: Study Animal and Areamentioning

confidence: 99%

“…1B). Endosteal resorption of the innermost LAG (Eden et al 2007) was not observed, and thus the periosteal bones only were counted. Inside collapse of bones occurred frequently at a 2-or 3-year ring, indicating a sharp growth of bones.…”

Section: Lines Of Arrested Growthmentioning

confidence: 99%

Age, Body Size, and Sexual Dimorphism in Size and Shape in Salamandrella keyserlingii (Caudata: Hynobiidae)

Hasumi

2010

Evol Biol

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In organisms with determinate growth, sexual size dimorphism (SSD) occurs before maturity during the developmental process of growing apart, an ontogenetic perspective on the evolution of SSD. If the direction of SSD (female-larger SSD) is known, patterns of growth can be tested with one-tailed statistical distributions. In indeterminate growing organisms as well, does SSD occur before maturity? If it occurs, whether is females' larger mean body size caused by a difference in age at maturity, age-specific size, divergent growth prior to maturity, or selection on post-maturational growth? How important is biphasic, sexual shape dimorphism (BSSD) for determinants of SSD? Biphasic characteristics are those that differ between adult aquatic-and terrestrial-phase morphs, and shape is size of a characteristic relative to body size. To address those questions, I determined age and body size based on a careful description of a growth trajectory for each sex in Salamandrella keyserlingii, using 555 independent data points from skeletochronological studies. Females reached maturity at 3-4 years of age, a year later than males that reached maturity at 2-3 years of age (mean body size: males = 57.63 mm, females = 61.70 mm; delayed sexual maturity resulted in SSD). However, SSD was highly detected before maturity (SSD index = 0.097), and females after maturity continued to grow and resulted in larger asymptotic size than males. Traits of BSSD were greater in males than in females. These results suggest that when determining SSD the difference in mean adult-body size results from the difference in age-specific size and the female-larger SSD develops to resolve intersexual ontogenetic conflict by allowing small-sized males to swell their whole body during the aquatic phase as much as large-sized females.

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“…In other study by Altunisik et al (2014) was documented, that age was not correlated with body size for the individuals. Also research study of Eden et al (2007) indicates that skeletochronological studies that do not use individuals of known age for calibration may underestimate age. On the other hand for example study of Khonsue et al (2010) concludes that skeletonchronology can be applied for ecological studies on protected species as newt.…”

Section: Discussionmentioning

confidence: 99%

The Using of Skeletochronology as a Screening Method for Age Determination of Alpine Newts (Mesotriton Alpestris): a Technical Report

Makovicky¹,

Kopecký²,

Makovický³

et al. 2015

Acta Univ. Agric. Silvic. Mendelianae Brun.

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Skeletochronology is a widely used method for age determination in amphibians. This method is based mainly on the histological examination of the fi nger bones. However, the lengths of utilized severed fi ngers have not been specifi ed in previous studies. The objective of this study was to analyse the structure of line arrested growth (LAGs) involving taking only the last two phalanges of a fi nger, and using the entire fi nger of Alpine newts (Mesotriton alpestris). Altogether 432 fi ngers were taken from four localities in the Czech Republic during the newt breeding period. The fi rst group (group A) contained fi ngers that consisted of the last two phalanges (330 samples), and the second (group B) contained complete fi ngers with all phalanges (102 samples). All fi ngers were processed using standard histological methods and stained with hematoxylin-eosin. Phalange cross-section slides were made, and the ages of the individuals were determined by the number of LAGs. From two phalanges it is determine the age of 17.87% of newts; however, age determination was successful in 49.01% of newts when using whole fi ngers. Age determination success rate diff erences between groups were signifi cant (P < 0.001). This is a histological study and it is recommended utilizing whole fi ngers in future Caudata amphibian screening age studies.

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Accuracy Assessment of Skeletochronology in the Arizona Tiger Salamander (Ambystoma Tigrinum Nebulosum)

Cited by 38 publications

References 26 publications

Crescimento do osso anular de falanges de cinco espécies de anuros neotropicais (Anura: Bufonidae: Atelopus)

Crescimento do osso anular de falanges de cinco espécies de anuros neotropicais (Anura: Bufonidae: Atelopus)

Age, Body Size, and Sexual Dimorphism in Size and Shape in Salamandrella keyserlingii (Caudata: Hynobiidae)

The Using of Skeletochronology as a Screening Method for Age Determination of Alpine Newts (Mesotriton Alpestris): a Technical Report

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