Life-History Traits of Plethodon Cinereus in the Northern Parts of Its Range: Variations in Population Structure, Age and Growth

Leclair, Maria Helena; Levasseur, Marc; Leclair, Raymond

doi:10.1655/0018-0831(2006)62[265:ltopci]2.0.co;2

Cited by 26 publications

(26 citation statements)

References 69 publications

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“…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

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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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Section: Methodological Considerationsmentioning

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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“…We used the average of each variable for the 10 yr prior to the historic and current salamander surveys as the predictor. We used a decadal average to more accurately capture average climates experienced by surveyed populations throughout the lifetime of adults (up to 8-9 yr, Leclair et al 2006). Lotter (1975) conducted his surveys from 1971-1973, so we used a decadal average of 1962-1971; for current surveys we used 2005-2014.…”

Section: Predictor Variablesmentioning

confidence: 99%

Salamander morph frequencies do not evolve as predicted in response to 40 years of climate change

et al. 2018

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The global climate is changing rapidly, yet biotic responses remain uncertain. Most studies focus on changes in species ranges or plastic responses like phenology, but adaptive evolution could be equally important. Studying evolutionary responses is challenging given limited historical data and a poor understanding of genetically variable traits under selection. We take advantage of a historical dataset to test for an adaptive response to climate change in a widespread, polymorphic amphibian, the eastern red‐backed salamander Plethodon cinereus. We resurveyed color morph frequencies across New England to test for an adaptive shift in response to climate change. We modeled historical and present‐day morph proportions as a function of climate and tested the accuracy of predictions both within and across different time periods. Our models showed moderate accuracy when predicting morph frequencies within time periods, but poor accuracy across time periods. Despite substantial changes in climate and significant relationships between morph frequency and climate variables within periods, we found no evidence for the predicted shift in morph frequencies across New England. The relationship between climate and color morph frequencies is likely more complex than originally suggested, potentially involving the interplay of additional factors such as microclimate variation, land use changes, and frequency‐dependent selection. Model extrapolation and changes in the correlation structure of climate variables also likely contributed to poor predictive ability. Evolution could provide a means to moderate the effects of climate change on many species. However, we often do not understand the direct links between climate variation, traits, and fitness. Therefore, forecasting climate‐mediated evolution remains an ongoing and important challenge for understanding climate change threats to species.

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“…Indeed, many ectotherms living at high altitudes or latitudes exhibit shorter activity seasons than conspecifics or congeneric species living in more thermally favorable environments (Goldberg, 1974;Ibargü engoytía and Casalins, 2007). Reduction in the length of the activity season can in turn affect the reproductive characteristics of many ectotherms (McCoy and Hoddenbach, 1966;Tinkle et al, 1970;Leclair et al, 2006). For instance, a shortened annual activity period has been correlated with delayed vitellogenesis, spermiogenesis, age at first reproduction, and decreased female reproductive frequency (Saint Girons, 1957;McCoy and Hoddenbach, 1966;Goldberg, 1974;Martin, 2002).…”

Section: Introductionmentioning

confidence: 99%

Timing of reproduction of a cold desert viperid snake from North America, the Great Basin rattlesnake (Crotalus lutosus)

Glaudas

Goldberg

Hamilton

2009

Journal of Arid Environments

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Life-History Traits of Plethodon Cinereus in the Northern Parts of Its Range: Variations in Population Structure, Age and Growth

Cited by 26 publications

References 69 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)

Salamander morph frequencies do not evolve as predicted in response to 40 years of climate change

Timing of reproduction of a cold desert viperid snake from North America, the Great Basin rattlesnake (Crotalus lutosus)

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