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Population trend inferred from aural surveys for calling anurans in Korea

Title
Population trend inferred from aural surveys for calling anurans in Korea
Authors
Borzee, AmaelAndersen, DesireeJang, Yikweon
Ewha Authors
장이권
SCOPUS Author ID
장이권scopus
Issue Date
2018
Journal Title
PEERJ
ISSN
2167-8359JCR Link
Citation
PEERJ vol. 6
Keywords
Aural surveyPopulation trendEncroachmentHylidDryophytes suweonensisRepublic of Korea
Publisher
PEERJ INC
Indexed
SCIE; SCOPUS WOS scopus
Document Type
Article
Abstract
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, and we found both environmental and landscape variables to be significant factors. Encroachment was also a key factor that influenced both the decreasing number of calling individuals and the negative population dynamics, represented here by the difference in the number of calling individuals between years. Generally, most sites displayed minimal differences in the number of calling males between years, although there was a large fluctuation in the number of individuals at some sites. Finally, when adjusted for the overall population size difference between years, we found the population size to be decreasing between 2015 and 2017, with a significant decrease in the number of calling individuals at specific sites. High rate of encroachment was the principal explanatory factor behind these marked negative peaks in population dynamics.
DOI
10.7717/peerj.5568
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자연과학대학 > 생명과학전공 > Journal papers
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