In the lower Nakdong catchment, which occupies a central location on the East Asian ? Australasian Flyway, 190 wetlands have been identified, and of these 82 have shown areal losses to some extent. To track the history of wetland loss in the region and evaluate them as bird habitat, 13 wetlands were...
In the lower Nakdong catchment, which occupies a central location on the East Asian ? Australasian Flyway, 190 wetlands have been identified, and of these 82 have shown areal losses to some extent. To track the history of wetland loss in the region and evaluate them as bird habitat, 13 wetlands were selected: Samrangjin, Wondong, Wolpo, Daepyeong, Jilnal, Daehak, Palak, Beongae, Jangcheok, Baksil, Jungyang and Yeondang wetland. Evaluating changes in wetland size was conducted by comparing the size of each site in the early, mid and late 20th century. As a result, most wetlands have decreased on average by about 53%; however, Wolpo wetland has lost about 98% of its original area. Comparatively, the area of Samrangjin, Hwapo, and Beongae wetlands has increased. In Samrangjin, the increase resulted from sediment accumulation, whereas in Hwapo and Beongae wetland the increase was the effect of boundary delineation between maps from different times.
Bird censuses for the 13 research sites were conducted 6 times between December 2006 and December 2007. 20,140 individuals of fifty-three bird species were observed in the 13 study sites. Some were internationally important species, such as Baikal Teal (Anas formosa) and Falcated Teal (Anas falcata). In particular, the number of observed Falcated Teal (Anas falcata) in Jangcheok and Beongae wetland, which lie in close proximity to each other, made up over 4% of the global population, showing that those sites support substantial populations of these species and therefore satisfy the Ramsar criterion necessary for the designation of internationally important wetlands. The dominant species for all 13 sites was Mallard (Anas platyrhynchos). The Shannon-Weaver diversity index for the research sites at its highest was 2.3 and its lowest was 1.3.
Correlation analysis showed that the total number of individuals was related to wetland area, and wetland area in turn was related to the number of species found within the wetland. However, the correlation between wetland area and avian diversity was low, which shows that wetland loss has influenced the avian diversity within the region.
The study has shown that a large percentage of wetland area within the lower Nakdong catchment has been degraded and lost, with the largest factor affecting the loss being farming; however, there has also been loss to industrial expansion. Because of this loss of wetland area, there has been a limited decline in diversity. This decrease in diversity underwrites the necessity of conservation of the remaining wetland area, even if it meets or does not meet the Ramsar criterion for wetland conservation.
In the lower Nakdong catchment, which occupies a central location on the East Asian ? Australasian Flyway, 190 wetlands have been identified, and of these 82 have shown areal losses to some extent. To track the history of wetland loss in the region and evaluate them as bird habitat, 13 wetlands were selected: Samrangjin, Wondong, Wolpo, Daepyeong, Jilnal, Daehak, Palak, Beongae, Jangcheok, Baksil, Jungyang and Yeondang wetland. Evaluating changes in wetland size was conducted by comparing the size of each site in the early, mid and late 20th century. As a result, most wetlands have decreased on average by about 53%; however, Wolpo wetland has lost about 98% of its original area. Comparatively, the area of Samrangjin, Hwapo, and Beongae wetlands has increased. In Samrangjin, the increase resulted from sediment accumulation, whereas in Hwapo and Beongae wetland the increase was the effect of boundary delineation between maps from different times.
Bird censuses for the 13 research sites were conducted 6 times between December 2006 and December 2007. 20,140 individuals of fifty-three bird species were observed in the 13 study sites. Some were internationally important species, such as Baikal Teal (Anas formosa) and Falcated Teal (Anas falcata). In particular, the number of observed Falcated Teal (Anas falcata) in Jangcheok and Beongae wetland, which lie in close proximity to each other, made up over 4% of the global population, showing that those sites support substantial populations of these species and therefore satisfy the Ramsar criterion necessary for the designation of internationally important wetlands. The dominant species for all 13 sites was Mallard (Anas platyrhynchos). The Shannon-Weaver diversity index for the research sites at its highest was 2.3 and its lowest was 1.3.
Correlation analysis showed that the total number of individuals was related to wetland area, and wetland area in turn was related to the number of species found within the wetland. However, the correlation between wetland area and avian diversity was low, which shows that wetland loss has influenced the avian diversity within the region.
The study has shown that a large percentage of wetland area within the lower Nakdong catchment has been degraded and lost, with the largest factor affecting the loss being farming; however, there has also been loss to industrial expansion. Because of this loss of wetland area, there has been a limited decline in diversity. This decrease in diversity underwrites the necessity of conservation of the remaining wetland area, even if it meets or does not meet the Ramsar criterion for wetland conservation.
※ AI-Helper는 부적절한 답변을 할 수 있습니다.