집쥐에 의한 슴새 번식성공률 감소

남기백,유승화,김동원,유정칠 경희대학교 한국조류연구소 2002 연구보고 Vol.8 No.1

본 조사는 2001년 6월 25일부터 30일, 8월 12일부터 17일, 10월 20~25일까지 제주도 북제주군 추자면에 위치한 사수도에서 집단 번식하는 슴새의 번식성공률을 조사하였다. 현재 사수도에는 약 4000쌍 정도의 슴새가 번식을 하는 것으로 조사되었다. 총 110개의 둥지를 관찰한 결과, 부화률은 약 15%로 나타났으며, 전체 번식성공률은 약 3%로 나타났다. 전체 번식실패률은 96.4%로 나타났으며, 번식실패 요인으로 집쥐에 의한 포식이 92.5%로 가장 높게 나타났다. 또한 포란기와 부화기에 포식률이 각각 42%, 36%로 육추기의 포식률(11%)보다 높게 나타났다. The rate of breeding success of Streaked Shearwaters (Calonectris leucomelas) was studied at Sasu-islet, in chuja-do, cheju island during 25-30 June, 12-17 August, 20-25 October 2001. The breeding population of Streaked Shearwaters at Sasu-islet is estimated to be about 4,000 pairs. This study was based on detailed observations of 110 nests dispersed over a wide range of nest habitats within colony. Hatching success was 15% (n=17), breeding success was 3% (n=3) and breeding failure was 96% (n=106). Norway Rat(Rattus norvegicus) were responsible for failure of at least 89% of all the breeding failure. The predation rates of both incubation and hatiching periods was higher than that of rearing period.

한국에 도해하는 검은머리갈매기(Larus saundersi)의 월동 현황

이기섭,박진영,이재범,김학진,유정칠 경희대학교 한국조류연구소 1999 연구보고 Vol.7 No.1

검은머리갈매기(Larus saundersi)는 그 동안 생존집단이 약 3,000개체로 추정되어온 멸종위기의 종이나, 한국에서의 월동 개체수에 대해선 현재까지 알려진 바가 없다. 본 조사는 1994년에서 1997년까지 동계기간에 실시되었다. 조사기간 동안 1994/95년 겨울에는 548개체, 1995/96년 겨울에는 1,159개체, 1996/97년에는 2,140개체가 관찰되었다. 해마다 증가하는 것으로 되어 있으나 실제는 조사면적이 확대된 데 그 원인이 있는 것 같다. 1994/97년 동계기간 동안에는 8개 조사지역에서 최대 2,425개체가 관찰되었다. 남해안에서는 조사가 광범위하게 이루어지지 않았기 때문에 월동 개체수는 이 보다 더 많을 것으로 추정되며, 종합적인 조사가 이루어진다면 전 세계의 생존집단은 6,000개체 이상이 될 것으로 사료된다. 조사지역 8곳 중에서는 순천만과 금강하구, 만경강하구에 각각 최대 500개체 이상이 도래하여 이 지역이 검은머리갈매기의 중요한 월동지임이 밝혀졌다. 성조에 대한 유조의 비율을 보면 평균 14.8%이었으나, 조사시기에 따라 변동이 있었다. 중국 리아오닝(Liaoning) 지방에서 적색 표식한 2개체가 아산만에서 관찰되었다. 최근 한국에서 새로 3개의 번식지가 발견되었으나 한국에서의 간척사업으로 인해 본 종이 계속 감소할 위기에 처해 있어 보존대책이 시급하다. Saunders's Gulls Larus saundersi are the endangered species and the world populations of the species were estimated about 3,000 individuals. The breeding sites were known at several sites in China, and the wintering areas were known in southern China, Hong Kong, Vietnam, Taiwan, Japan and Korea. Recently, the number of Saunders's Gulls was rapidly increased in Kyushu province of Japan: about 1,000 birds wintering there. One of factors affecting on the increasing population of Saunders's Gulls in Japan may be due to the destruction of the wintering habitats of Saunders's Gulls in Korea. But the wintering population of Saunders's Gulls in Korea has not been reported by now. We surveyed during the winter season of 1994~1997, and counted 548 individuals in 1994~95, 1,159 in 1995~96, and 2,140 in 1996~97. The increasing population each year may be due to the increase of survey areas each year in Korea. The peak count obtained from 8 sites was 2,425 individuals during the winter season of 1994~97. The real wintering population of Saunders's Gulls would be more than 2,425 individuals, because we did not survey many parts of southern coast although most areas of west coast were surveyed. If we estimate the world populations of Saunders's Gulls on the basis of this study and a Japanese report made in 1996(4,387 individuals), the world populations of the species may be more than 6,000 individuals. Sunchon bay, Kum river estuary, and Mankyung river estuary are major habitats supporting over 500 individuls of the wintering Saunders's Gulls every year in Korea. The ratio of juveniles to adults was averaged on 14.8% in the wintering population of Saunders's Gulls in Korea. Two individuals tagged with red colour flags were found in Asan bay, indicating that some birds wintering in Korea bred in Liaoning province of China. Breeding sites were newly found in the three reclaimed salt marshes. The major habitats of Saunders's Gulls should be set aside for nature reserves for effective protection and management, and should be turned into Ramsar sites to protect Saunders's Gulls in Korea.

Clutch-size in birds : a window of evolution?

Jeong-Chil Yoo(劉正七) 한국조류학회II 1994 한국조류학회지 Vol.1 No.1

Effect of Host Egg Color Dimorphism on Interactions Between the Vinous-throated Parrotbill (Paradoxornis webbianus) and Common Cuckoo (Cuculus canorus)

Yoo, Jeong-Chil,Lee, Jin-Won The Korean Society for Integrative Biology 2004 Korean journal of biological sciences Vol.8 No.2

To investigate the effect of host egg color dimorphism on the vinous-throated parrotbill (Paradoxornis webbianus) - common cuckoo (Cuculus canorus) interactions, we monitored breeding nests of vinous-throated parrotbills, and conducted model egg experiments, using two colors: white and blue. Of the 190 nests examined in this study, cuckoo parasitism occurred at 10 nests (8 blue and 2 white egg clutches, respectively), and only blue cuckoo eggs were found. This frequency was similar to the egg-color ratio of all host nests found (151 blue and 39 white egg clutches). Vinous-throated parrotbills showed high rejection rate towards both cuckoo eggs and model ones. There was a significant difference in rejection rates towards mimetic (blue) and non-mimetic (white) eggs in blue egg clutches. Mimetic eggs put in nests took significantly longer to be rejected than non-mimetic ones. The most common rejection method used by the hosts was egg ejection (puncture-ejection). The costs of ejecting non-mimetic eggs tended to be lower than those of ejecting mimetic eggs. These results indicate that egg-color dimorphism in this species favors the individuals having white egg clutches in terms of higher rejection rate and lower ejection costs of the parasitic eggs. This study also suggests that egg-color dimorphism of the vinous-throated parrotbill decreases the effect of cuckoo parasitism on host populations.

Some Aspects of Laying, Incubation and Hatching in the Black-tailed Gull, Larus crassirostris

Jeong-Chil Yoo(劉正七),Young-Soo Kwon(권영수) 한국조류학회II 1997 한국조류학회지 Vol.4 No.1

Some Aspects of Laying, Incubation and Hatching in the Great Reed-Warbler

Yoo, Jeong-Chil,Choi, Yu-Seong The Ecological Society of Korea 2002 Journal of Ecology and Environment Vol.25 No.4

During the breeding season of 1998, breeding ecology of the Great Reed-Warbler (Acrocephalus arundinaceus orientalis) was studied at Yangsoo-ri and Yongdam-ri of the Yangpyung-gun, Kyunggi province, Korea. Egg-weight (CV: 6.25) was more variable than either length or breadth, and breadth was the least variable of the measures. Significant variations in overall egg-weight occurred between clutches, and that more of the total variation in egg-weight and shape are due to inter-clutch variation as to intra-clutch variation when the data were pooled. The last egg tends to be larger than the remaining eggs in the clutch of the Great Reed-Warbler, suggesting the Great Reed-Warbler may adopt the brood-survival strategy. When method 3 was used, the most common incubation period is 12 days. In the Great Reed-Warbler, the length of the incubation period was related to clutch-size when method 1 (r=0.485, p<0.05) and method 2 (r=0.621, p<0.01) were employed, but not related to egg weight. The averagee number of days of hatching asynchrony was 2.5, raging 0.5~2.5. Asynchronous hatching was related to the clutch size (r=0.66, p<0.01). Hatching sequence was closely related to the laying sequence (r=0.93, p<0.001), suggesting Great Reed-Warblers incubate their eggs before clutch completion. The effect of egg weight on hatching asynchrony was found in Great Reed-Warblers (t-test, p<0.01).

진관내동 생태경관 보전지역의 조류현황(2003-2005)

유정칠 ( Jeong Chil Yoo ),최유성 ( Yu Seong Choi ) 경희대학교 한국조류연구소 2007 연구보고 Vol.10 No.1

진관내동 생태계보전지역의 조류 현황

유정칠 ( Jeong Chil Yoo ),최유성 ( Yu Seong Choi ) 한국조류학회(鳥類) 2005 논문집 Vol.2005 No.-

본 조사는 서울시가 2002년 지정한 진관내동 생태계보전지역의 조류 현황을 알아보고, 보전지역의 효과적인 관리 방안을 모색하기 위하여 실시되었다. 2003년 6월과 9월, 2004년 2월과 4월에 걸쳐 계절별로 각 1회씩 조사를 실시하였다. 관찰된 조류는 총 32종이 관찰되었으며, 계절별로는 여름(23종 77개체)에 가장 많은 종과 개체수갈 관찰되었다. 우점종은 붉은머리오목눈이(28.3%), 오목눈이(15.7%), 쑥새(13.8%), 멧비둘기(4.4%) 등이었다. 번식가능성이 있는 종은 총 25종으로 판단된다. 진관내동 생태계보전지역에서의 조류 서식에 방해가 되는 요인은 인간에 의한 침입과 서식지 훼손이 가장 큰 것으로 판단된다. The Jingwannae-dong Ecosystem Protected Area (EPA) was designated by the city of Seoul in 2002. A survey of birds in the Jingwannae-dong EPA was conducted from June 2003 to April 2004. 32 species and 159 individuals of birds were recorded in Jingwannae-dong EPA. The most dominant species was Vinous-throated Parrotbills (Paradoxornis webbianus), consisting of 45 individuals (28.3%), followed by Aegithalos caudatus (25 individuals, 15.7%), Emberiza rustica (22 individuals, 13.8%), and Streptopelia orientalis (7 individuals, 4.4%). Twenty five species of birds bred Jingwannae-dong EPA. The main disturbance factor in Jingwannae-dong EPA was destruction by landowners against designation of EPA just before the designation.

한강하류에 서식하는 조류의 분포 및 서식처 연구

유정칠 ( Jeong Chil Yoo ),권영수 ( Young Soo Kwon ) 한국조류학회(鳥類) 2005 논문집 Vol.2005 No.-

2003년 1월부터 5월까지 총 4회에 걸쳐 한강하류일대(김포대교~이산포)의 조류의 분포 및 서식 현황을 조사한 결과 총 37종 16,417개체가 관찰되었다. 종별 우점도는 청둥오리(Anas platyrhnchos)가 3,757개체(22.9%)로 가장 많았고 다음으로 큰기러기(Anser fabalis) 1,493개체(9.1%), 쇠기러기(Anser albifrons) 1,290개체(7.8%) 순이었다; 1지역(김포대교일대)에서 가장 많은 종이 관찰되었고, 5지역(사미섬 부근)에서는 가장 많은 개체수가 관찰되었다. 지역별 종 다양성 및 보편지수는 모두 김포대교 일대에서 가장 높았고 장항IC-신평IC에서 가장 낮았다. 계절별로는 2월에 종 다양성과 보편지수가 가장 높았고 반면에 3월에는 가장 낮았다. A study on the distribution and habitat of birds in Hangang river estuary was conducted from January to May 2003. The total number of birds observed was 16,450 individuals of 37 species. The dominant species were mallards (Anas platyrhnchos) which covered 22.9% (3,757 individuals) of the total number, 9.1 % (1,493 individuals) of white-fronted geese (Anser fabalis), and 7.9%(1,290 individuals) of Bean geese(Anser albifrons). In this study, the maximum number of species was recorded at the site I, and the maximum number of individuals was observed at the site 5. Species diversity(H′) and index of similarity(e(H′)) were recorded higher at site 1(vicinity of Kimpo bridge). Species diversity(H′) and index of similarity(e(H′)) were the highest in February, and the lowest in March.

암사동 생태경관 보전지역의 조류현황(2003-2005)

유정칠 ( Jeong Chil Yoo ),최유성 ( Yu Seong Choi ) 경희대학교 한국조류연구소 2007 연구보고 Vol.10 No.1