Growth cycle of the marbled newt (Triturus marmoratus) in the Mediterranean region assessed by skeletochronology

Jakob, Christiane; Seitz, Alfred; Crivellì, Alain J.; Miaud, Claude

doi:10.1163/15685380260462329

Cited by 29 publications

(20 citation statements)

References 18 publications

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“…Misinterpretation of LAGs is common when they are not strongly expressed (i.e., clearly defined and stained) (Castanet and Smirina 1990) and double lines, probably formed due to temporary, shortterm ecological factors (i.e., very high temperatures, very dry conditions, variations in food availability, etc.) in the environment (Jakob et al 2002), could be interpreted as two LAGs. Second, unexpectedly we observed a high degree of bone remodeling (i.e., scalloped surfaces and deposition of endosteal bone) in most samples.…”

Section: Discussionmentioning

confidence: 99%

Age estimation through skeletochronology and mark-recapture of free-living Liolaemus leopardinus (Squamata: Liolaemidae) from Chile

Santoyo-Brito

Fox

Núñez³

2018

Phyllomedusa

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Age estimation through skeletochronology and mark-recapture of free-living Liolaemus leopardinus (Squamata: Liolaemidae) from Chile. Age determination is a crucial component of ecological studies. Researchers have relied on different methods and techniques, for example mark-recapture, body size, and skeletochronology, to assess the age of free-ranging individuals. We used all three methods to estimate the age structure of a population of Liolaemus leopardinus, a highly social and saxicolous lizard species endemic to the temperate region of central Chile. This high-elevation and secretive species is considered threatened and, although efforts have been made to reveal more specific details about the species' natural history, crucial details of its biology are still unknown. Our goal was to associate the number of Lines of Arrested Growth (LAGs) to snout-vent length (SVL) and use LAGs as an age estimation proxy on free-ranging individuals. For the skeletochronology analyses, a combination of toe-clips was collected when each subject was first captured in 2012-2013. SVL for all captured individuals was recorded during two different field seasons (austral spring to fall of 2011-2012 and 2012-2013). SVL data were also available for 10 individuals initially collected and permanently marked in 2005 (one juvenile and nine adults) and recaptured in 2011-2012. Three of those 10 subjects were captured again in 2012-2013. Our results revealed the formation of LAGs in L. leopardinus and a high degree of bone remodeling in both juveniles and adults. This bone remodeling combined with the high rapprochement in peripheral LAGs on the samples of the oldest lizards suggest that phalangeal bones are not suitable for age determination in this species. On the other hand, our mark-recapture results allowed us to assign individuals to four different age-classes when a subject's SVL was associated with activity periods and recaptures. Individuals of L. leopardinus are long-lived and their lifespan can exceed a decade. Female lizards become sexually mature at three to four years of age.Keywords: bone, body-length, high-altitude, lifespan, lines of arrested growth, lizards. 102Phyllomedusa -17(1), June 2018 Resumo Estimativa etária por meio de esqueletocronologia e marcação-e-recaptura de Liolaemus leopardinus (Squamata: Liolaemidae) do Chile. A determinação etária é um componente crucial de estudos ecológicos. Pesquisadores tem usado diferentes técnicas e métodos como marcação-erecaptura, tamanho do corpo e esqueletocronologia, para avaliar a idade de indivíduos na natureza. Usamos esses três métodos para estimar a estrutura etária de uma população de Liolaemus leopardinus, uma espécie de lagarto saxícola, altamente social e endêmica da região temperada do centro do Chile. Essa espécie secretiva de grandes altitudes é considerada ameaçada, e apesar dos esforços para descobrir detalhes específicos sobre a sua história natural, detalhes cruciais de sua biologia permanecem desconhecidos. Nosso objetivo foi associar o número de Linha...

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Section: Discussionmentioning

confidence: 99%

Age estimation through skeletochronology and mark-recapture of free-living Liolaemus leopardinus (Squamata: Liolaemidae) from Chile

Santoyo-Brito

Fox

Núñez³

2018

Phyllomedusa

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“…These double LAGs are caused by unpredictable ecological factors such as very high temperatures, very dry conditions, variations in food availability, and other occasional environmental changes (Jakob et al, 2002;Guarino and Erismis, 2008). Iğdır has a semiarid continental climate with hot dry summers, and cold snowy winters, and is the driest city in Turkey (total yearly precipitation of 260.3 mm) close to the borderline of the arid climate that nevertheless does not exist in Turkey (www.dmi.gov.tr, Iğdır Observation Station, 1970.…”

Section: Discussionmentioning

confidence: 99%

Age structure and body size of the Strauch’s racerunner, Eremias strauchi strauchi Kessler, 1878

Altunışık¹,

Gül²,

Özdemır³

et al. 2013

Turk J Zool

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“…Annual deposition of skeletal growth marks has been demonstrated for known-age Kemp's ridley Lepidochelys kempii and loggerhead Caretta caretta turtles (Snover & Hohn 2004), as well as for bonemarked (Snover et al 2011), tagged, and known-age green turtles (Goshe et al 2010). However, due to the potential for occurrence of supplemental (nonannual) marks resulting from other factors impacting growth (Jakob et al 2002, Snover & Hohn 2004, Olgun et al 2005, validation of deposition frequency for each study population is preferred.…”

Section: Age Estimationmentioning

confidence: 99%

Population characteristics, age structure, and growth dynamics of neritic juvenile green turtles in the northeastern Gulf of Mexico

Avens

Goshe²,

Harms³

et al. 2012

Mar. Ecol. Prog. Ser.

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Characterization of a population of green turtles inhabiting the northeastern Gulf of Mexico was made possible by the mortality of a subset of > 4500 sea turtles that stranded during a mass cold stunning event in Florida, USA, during January 2010. In total, 434 dead, stranded green turtles Chelonia mydas were evaluated through necropsy and skeletochronological analysis to characterize morphology, sex, body condition, disease status, age structure, and growth patterns. Standard straightline carapace lengths ranged from 18.1 to 78.5 cm (mean ± SD = 36.3 ± 10.4 cm) and did not significantly differ from those of stranded green turtles that survived this event. Prevalence of fibropapilloma (FP) was low, at 6%, and sex ratio was significantly biased toward females (2.45F:1M). Age estimates ranged from 2 to 22 yr (mean ± SD = 9 ± 4 yr) and female age distribution was significantly greater than that of males. Mean stage durations, as calculated through sum mation of size class-specific growth rates and fitting smoothing spline models to length-at-age data, were similar and ranged from 17 to 20 yr. Generalized additive models and generalized additive mixed models were used to assess the potential influence of discrete and continuous covariates on growth rates. Somatic growth was significantly influenced by size, age, and calendar year; however, no effect of sex, FP status, or body condition was found. Increased understanding of population parameters will improve population models for the species and can also serve as a reference for assessing potential effects of the 2010 Deepwater Horizon oil spill in the Gulf of Mexico. 458: 213-229, 2012 mation was recently emphasized in the aftermath of the April 20, 2010, Deepwater Horizon (DWH) MC-252 oil spill in the Gulf of Mexico during initiation of efforts to assess the effects to sea turtles of this catastrophic event (Bjorndal et al. 2011, Crowder & Heppell 2011. However, collection of these data is made difficult by deficiencies in the ability to assess sea turtle populations in an unbiased manner (Heppell et al. 2003). Population characterizations based on nesting beach studies, while prevalent due to the relative accessibility of the females on the beach, are necessarily focused in their scope (NRC 2010). In-water studies are often restricted to limited geographic areas (Bjorndal & Bolten 2000) and the proportion of individuals available to be sampled can be influenced by stage-and population-specific partitioning of habitat use (Musick & Limpus 1997, Plotkin 2003 and sex-specific behavior (Wibbels 2003). In addition, the time frames over which data collection must occur to adequately assess population parameters for these generally slow-to-mature, long-lived species are daunting (Heppell et al. 2003). OPEN PEN ACCESS CCESSMar Ecol Prog SerLife history data obtained from dead, stranded sea turtles can be informative, but often need to be interpreted with caution given the general lack of information regarding cause of death (natural vs. anthropogenic) (NRC 2...

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Growth cycle of the marbled newt (Triturus marmoratus) in the Mediterranean region assessed by skeletochronology

Cited by 29 publications

References 18 publications

Age estimation through skeletochronology and mark-recapture of free-living Liolaemus leopardinus (Squamata: Liolaemidae) from Chile

Age estimation through skeletochronology and mark-recapture of free-living Liolaemus leopardinus (Squamata: Liolaemidae) from Chile

Age structure and body size of the Strauch’s racerunner, Eremias strauchi strauchi Kessler, 1878

Population characteristics, age structure, and growth dynamics of neritic juvenile green turtles in the northeastern Gulf of Mexico

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