Age structure and growth rates of two Korean salamander species (<i>Hynobius yangi</i>and<i>Hynobius quelpaertensis</i>) from field populations

Lee, Jung-Hyun; Min, Mi‐Sook; Kim, Sang Woo; Baek, Hae-Jun; Lee, Hang; Park, Daesik

doi:10.1080/19768354.2010.525810

Cited by 8 publications

(5 citation statements)

References 31 publications

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“…Under the assumption that all adult age classes experience equivalent survival rates, age structure data are decreasing geometric series (Seber, 1986 ) from which the interval survival rate may be estimated (Chapman & Robson, 1960 ; Jensen, 1985 ). The approach has been widely used in fisheries research, with several applications to amphibians aged by skeletochronology (Lee et al, 2010 ; Miaud et al, 2000 ). The approach of Scroggie ( 2012 ) allows survival rate to be modeled as a function of covariates using a linear equation and logistic link function.…”

Section: Methodsmentioning

confidence: 99%

Age structure of amphibian populations with endemic chytridiomycosis, across climatic regions with markedly different infection risk

Turner

Heard

Hall

et al. 2022

Ecology and Evolution

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Threatening processes, such as disease, can drive major changes in population demographics of the host. Chytridiomycosis, caused by the fungal pathogen Batrachochytrium dendrobatidis ( Bd ), has led to the decline of at least 500 amphibian species across the globe and has been shown to truncate host age structure by lowering adult survival rates. This results in heavy reliance on annual recruitment and the inability to recover in the event of periodic recruitment failure. We used skeletochronology to determine the age structure, growth, and survival rates of populations of an endangered amphibian, Litoria raniformis , with endemic chytridiomycosis, across two climatically disparate regions in south‐eastern Australia: semi‐arid and temperate. Contrary to predictions, populations in the semi‐arid region (in which chytrid prevalence is substantially lower due to high temperatures) displayed a more truncated age structure than populations in the temperate study regions. Maximum recorded age was only two years in the semi‐arid region compared with up to four years in the temperate region. Wetland hydroperiod and average seasonal air temperature were correlated with age, and males had a slightly higher survival rate than females (0.31 for males and 0.27 for females). Despite the previously documented differences in chytrid prevalence between the two climatic regions, water availability and wetland hydroperiods appear the over‐riding determinants of the age structure and survival rates of L. raniformis . Targeted management which ensures water availability and improves survival of 1‐year‐old frogs into their second and third breeding season would reduce the impact of stochastic events on L. raniformis , and this may be true for numerous frog species susceptible to chytridiomycosis.

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Section: Methodsmentioning

confidence: 99%

Age structure of amphibian populations with endemic chytridiomycosis, across climatic regions with markedly different infection risk

Turner

Heard

Hall

et al. 2022

Ecology and Evolution

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“…However, the data collected here cannot be compared with living animals, or collections relying on other fixatives. Tissue (leg or tail muscle) was extracted from each individual for species identification with molecular tools and all sequences are already available in the literature [ 42 , 52 , 53 , 54 , 55 , 57 ].…”

Section: Methodsmentioning

confidence: 99%

“…To assess the patry status of each individual—here defined as sympatric or allopatric—independently of the presence of samples from the location belonging to two clades, we reconstructed the range of each species. To do so, we used all datapoints with molecular identification available from the literature [ 42 , 52 , 53 , 54 , 55 , 57 ]. However, some datapoints were not precise enough to be used for range reconstruction, and we only used datapoint with at least 2 km accuracy, resulting in a sample size such as: H. leechii = 107; H. quelpaertensis = 31; H. unisacculus = 5; H. yangi = 29; H. notialis sp.…”

Section: Methodsmentioning

confidence: 99%

Disentangling the Impacts of Speciation, Sympatry and the Island Effect on the Morphology of Seven Hynobius sp. Salamanders

Borzée

Min

2021

Animals

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Closely related individuals from different areas can see their morphologies change based on differences between clades, but also ecological variables such as the island effect or sympatry. This is the case of salamanders, which have adapted to a broad range of ecological niches, ranging from underground dwellers in xeric landscape to tropical arboreal habitats. On the Korean Peninsula, salamanders from the Hynobius clade are widespread on the mainland and islands, with several partially sympatric clades and candidate species. Currently, seven lineages have been identified based on mtDNA, four of them matching named species and three others for which the species status remains untested. While the morphology of Korean Hynobius is known to be variable between genetically segregated clades, we hypothesise that (1) the candidate species are morphologically different, and that (2) the island effect and (3) the sympatric status have significant impacts on the morphology of individuals within the genus. Here we measured 329 Hynobius salamanders from all seven clades, in areas of sympatry and allopatry, and on islands and on the mainland (Graphical Abstract A). We determined that the island effect had a significant impact on the morphology of the genus, with mainland individuals generally displaying a broader range of morphology than islandic individuals (Graphical Abstract B). We also determined that sympatry had an impact on morphology, with the sizes of individuals from clades in sympatric areas diverging from each other (Graphical Abstract C). Finally, we demonstrated that all seven clades have significantly different morphologies, and we described the three candidate species that had already been isolated based on mtDNA and microsatellite data: Hynobius notialis sp. nov., Hynobius geojeensis sp. nov. and Hynobius perplicatus sp. nov. We conclude that looking at morphology alone would be misleading about the true diversity of Hynobius species, and species in general, because of the island and patry effects.

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“…Similar to other parts of the world, many Korean salamanders and anurans have also been investigated with skeletochronology [ 18 , 19 , 20 , 21 , 22 , 23 , 24 , 25 ]. Unfortunately, most of these studies with skeletochronology on Korean amphibians have not been able to identify the IVL.…”

Section: Introductionmentioning

confidence: 99%

Confirmation of the Applicability of Skeletochronology and Estimating the Age Structure of Kaloula borealis (Microhylidae: Anura) at Lake Sihwa, South Korea

Rahman

Lee

Park

et al. 2022

Biology

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Despite having some limitations, the use of skeletochronology—age determination by counting lines of arrested growth (LAGs)—in amphibians is increasing. The main limitation of using skeletochronology is identifying the innermost visible line (IVL) and counting the exact number of LAGs. Thus, we tested its applicability to Kaloula borealis, a class II endangered amphibian in South Korea. We reared juveniles in the lab to investigate the process of bone formation. This confirmed the development of one LAG each year. Hence, our study validates skeletochronology for the age determination of this species and recommends it for others that show similar growth patterns. Furthermore, the comparison of threshold diameters with the IVL of wild individuals confirmed no LAG1 resorption. The average age of males and females in this population was 2.75 ± 1.05 and 3.64 ± 3 years, respectively. We estimated sexual maturity at 2 years with rapid growth up to that stage in both sexes. We found a female-dominated sexual size dimorphism. This study offers accurate information on the life history traits and age structure of K. borealis that may help to evaluate population dynamics in other areas, identify vulnerable life stages and sites, assess the causes of population decline, and set conservation priorities.

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Age structure and growth rates of two Korean salamander species (Hynobius yangiandHynobius quelpaertensis) from field populations

Cited by 8 publications

References 31 publications

Age structure of amphibian populations with endemic chytridiomycosis, across climatic regions with markedly different infection risk

Age structure of amphibian populations with endemic chytridiomycosis, across climatic regions with markedly different infection risk

Disentangling the Impacts of Speciation, Sympatry and the Island Effect on the Morphology of Seven Hynobius sp. Salamanders

Confirmation of the Applicability of Skeletochronology and Estimating the Age Structure of Kaloula borealis (Microhylidae: Anura) at Lake Sihwa, South Korea

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