Growth-Mark Formation and Chronology of Two Neotropical Anuran Species

Marangoni, Federico; Schaefer, Eduardo Federico; Cajade, Rodrigo; Tejedo, Miguel

doi:10.1670/08-230r1.1

Cited by 24 publications

(16 citation statements)

References 13 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Although many skeletochronological studies are affected by the growth trajectory problems mentioned above, leading to false modeling, a growth curve for each sex appears to fit Bertalanffy's (1938) equation or the BertalanffyHemelaar (1988) equation when using data on 0-year metamorphs and multi-year juveniles in nonmigratory salamanders such as ovoviviparous salamandrids and terrestrial plethodontids Olgun et al 2001;Leclair et al 2006) and monthly samples in neotropical frogs (Marangoni et al 2009). In contrast, because data on 0-year metamorphs are included in the estimation of growth curves for migratory frogs or salamanders, without data on multi-year juveniles, it is impossible to fit nonlinear models (e.g., Caetano and Castanet 1993;Miaud et al 1999Miaud et al , 2000.…”

Section: Methodological Considerationsmentioning

confidence: 99%

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

Hasumi

2010

Evol Biol

View full text Add to dashboard Cite

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.

show abstract

Section: Methodological Considerationsmentioning

confidence: 99%

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

Hasumi

2010

Evol Biol

View full text Add to dashboard Cite

show abstract

“…During periods of reduced activity such as hibernation and aestivation, bone tissue apposition stops and a LAG is formed; therefore, each LAG represents one year of life, as was confirmed by mark-recapture studies (Tejedo, Reques and Esteban, 1997). LAG formation can reflect not only seasonal, but also intrinsic biological rhythms, such as one might encounter in tropical species that are active year-round without hibernation or estivation (Castanet et al, 1993;Guarino, Andreone and Angelini, 1998;Khonsue, Matsui and Misawa, 2000;Pancharatna, 2001, 2002;Morrison, Hero and Browning, 2004;Lai, Lee and Kam, 2005;Marangoni et al, 2009). Individual frogs were sexed and measured for snout to vent length (SVL) to the nearest 0.1 mm.…”

mentioning

confidence: 99%

Skeletochronological analysis of age structure in populations of four species of Malagasy poisonous frogs, genus Mantella

Jovanovic

Vences

2010

Amphib Reptilia

View full text Add to dashboard Cite

Age structure of populations of four species of endemic Malagasy frogs of the genus Mantella (M. aurantiaca, M. baroni, M. bernhardi, M. madagascariensis) was examined by skeletochronology based on 96 specimens from nine different localities.In more than half of these (57%), no lines of arrested growth (LAGs) were found, and the number of LAGs recognized in the remaining specimens was mostly one, and probably two in three specimens. It is generally considered that each LAG corresponds to one year of life; our results therefore confirm that in Mantella populations almost all specimens are in their first or second year of life.

show abstract

“…In these tropical studies it was sometimes assumed that dry/wet seasonality serves as the climatological cause for haematoxylinophilic lines of arrested growth. Recent researchers have found that in a seasonal habitat the LAGs formation may be under genetic control rather than seasonal (Marangoni et al 2009). Others have found that in yearly stable environments, LAGs could be irregular or altogether absent (Kusrini andAlford 2006, Tessa et al 2007).…”

Section: Introductionmentioning

confidence: 99%

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

Lindquist¹,

Redmer²,

Brantner³

2012

Phyllomedusa

View full text Add to dashboard Cite

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.

show abstract

Growth-Mark Formation and Chronology of Two Neotropical Anuran Species

Cited by 24 publications

References 13 publications

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

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

Skeletochronological analysis of age structure in populations of four species of Malagasy poisonous frogs, genus Mantella

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

Contact Info

Product

Resources

About