Population trend inferred from aural surveys for calling anurans in Korea

@article{Borze2018PopulationTI,
  title={Population trend inferred from aural surveys for calling anurans in Korea},
  author={Ama{\"e}l Borz{\'e}e and Desiree Andersen and Yikweon Jang},
  journal={PeerJ},
  year={2018},
  volume={6}
}
Amphibian populations fluctuate naturally in size and range and large datasets are required to establish trends in species dynamics. To determine population trends for the endangered Suweon Treefrog (Dryophytes suweonensis), we conducted aural surveys in 2015, 2016, and 2017 at each of 122 sites where the species was known to occur in the Republic of Korea. Despite being based on individual counts, the focus of this study was to establish population trends rather than population size estimates… 

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References

SHOWING 1-10 OF 89 REFERENCES
Description of a seminatural habitat of the endangered Suweon treefrog Hyla suweonensis
TLDR
The habitat characteristics of a seminatural site for H. suweonensis, a treefrog species endemic to Korea, have a large percentage of rice paddies with a very low percentage of urban areas, a feature consistent with findings of a previous study.
Introduced bullfrogs are associated with increased Batrachochytrium dendrobatidis prevalence and reduced occurrence of Korean treefrogs
TLDR
The presence of L. catesbeianus can now be added to the list of factors responsible for the decline of D. suweonensis populations, and the endangered Dryophytes suwe onensis displays a significantly higher Bd prevalence than the more abundant D. japonicus.
Estimating population size in the European tree frog (Hyla arborea) using individual recognition and chorus counts
TLDR
It is shown that there is no simple relationship between maximum or mean chorus size and modelled male population sizes estimated from CMR study and that population trends inferred from chorus counts are likely to be biased to an unknown extent.
Annual Surveys of Larval Ambystoma cingulatum Reveal Large Differences in Dates of Pond Residency
TLDR
This analysis suggested that the primary dates of hatching occurred in late February 2005 and early January 2006, a difference that corresponds to that seen in the residency of the latest larval stages.
Surveys of Calling Amphibians in North Dakota
Amphibians have received increased attention in recent years from the scientific community and general public alike. Many populations throughout the world have declined or have been extirpated, often
Abiotic effects on calling phenology of three frog species in Korea
TLDR
Studying the seasonal and diel calling activities of anuran species in a wetland in central Korea to determine the calling season and to evaluate the effects of abiotic factors on male calling determined R. nigromaculata to be a summer caller independent of weather.
PERSPECTIVES ON AMPHIBIAN POPULATION DECLINES: DEFINING THE PROBLEM AND SEARCHING FOR ANSWERS.
TLDR
There is a general paucity of information about natural amphibian populations under normal conditions and this information is needed to understand why declines in population number occur.
Environmental factors influencing calling in sympatric anurans
TLDR
This work examines the relationship between multiple abiotic environmental variables – specifically, air and water temperature, rainfall, barometric pressure, relative humidity and wind velocity – and the calling activity of five species in an anuran community in New Brunswick, Canada and found that each species responded to a unique combination of meteorological variables.
Variations in boldness, behavioural and physiological traits of an endangered and a common hylid species from Korea
TLDR
The correlation between the endangered D. suweonensis with a narrow ranges and depressed boldness, in comparison to the widespread and closely related D. japonicus is highlighted, making the later species more fit to its environment, allowing for faster escape and wider dispersal capabilities.
...
...