Honors College Thesis
 

Toad Populations Decreasing in South Korea

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https://ir.library.oregonstate.edu/concern/honors_college_theses/0p096881h

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  • Massive die-offs of Bufo bufo gargarizans were observed in May 2008 in Mangwal Gee, Korea. To find out the causes for this disaster several different elements were examined: pH, total nitrogen, dissolved oxygen (DO), and dissolved heavy metal, suspension, introduced species, habitat change, disease, temperature changes, and precipitation and humidity. After checking pH, total nitrogen, dissolved oxygen, and heavy metal, the quality of water appeared to be acceptable for toads. No introduced species were found which could kill or compete with toads. Even though there were environment changes surrounding Mangwal Gee, thanks to government efforts the condition of the pond has not changed for years. The pathogenic chytrid fungus, Batrachochytrium dendrobatidis responsible for amphibian population declines worldwide was not found. The average temperature was little higher, and precipitation was lower compared to last 30 years, however there was no evidence found to indicate as a cause of mass die-off.
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