• Ocean and Polar Research
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• 제29권1호
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• pp.81-86
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• 2007

Abandoned fishing nets served Little Tern(Sterna albifrons) chicks as cover on a sandy island on Ganwol Lake, Hongsung-gun, Chungcheongnam-do, Korea. Chicks were incidently caught in $2.5cm{\times}2.5cm$ mesh sized nets and died of dehydration and exhaustion. Three adults died when they were caught by abandoned fishing net during parental care period in $2.5cm{\times}2.5cm$ mesh sized nets. Whereas $0.7cm{\times}0.7cm$ mesh sized nets did not affect the chicks' or adults' survival. Overlapped nets with several layers were more dangerous for chicks than were spread nets with a single layer. Dead chicks and adults were found to have been entangled by wing and neck. In this study, wing and nape(head+bill) of dead chicks were longer than those of live chicks. To improve the survival rate of Little Tern chicks at Ganwol Lake, abandoned fishing nets must be removed before the breeding season.

• Journal of Ecology and Environment
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• 제31권1호
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• pp.37-43
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• 2008

We analyzed soil characteristics, soil seed banks, and plant communities in a small islet in Ganwol Lake from May 2005 to August 2006 to examine the forces driving plant settlement on sand bars and the effects of plant settlement patterns on nesting sites of little terns (Sterna albifrons). The soil nutrients contents in a site where the feces of wintering birds accumulate (N: 15.4 mg/kg, P: 10.5 mg/kg, LOI: 0.51 %, pH: 6.8) and a site where organic sediments accumulate (N: 20.7 mg/kg, P: 16.4 mg/kg, LOI: 0.40%, pH: 6.6) were much higher those of a control site which was not affected by bird feces and organic sediments (N: 4.1 mg/kg, P: 5.4 mg/kg, LOI: 0.41%, pH: 6.7). However, a seed bank was formed only on the site with accumulated organic sediments. Plant settlement was accelerated by feces from wintering birds and organic sediment accumulation on sand bars in Ganwol Lake. The percentage of area disturbed by human activities increased from 0.2% in May 2005 to 13.9% in August 2006, and the percentage of annual communities increased from 27.5% to 43.3%, but the percentage of open area decreased from 55.2% to 28.0% from May 2005 to August 2006. These increases in disturbed area and annual communities decreased the open area for breeding of little terns. The enlargement of P. communis and T. angustata communities was suppressed by irregular flooding. These results provide useful information for the management of little tern breeding sites for conservation purposes.

• Journal of Ecology and Environment
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• 제29권6호
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• pp.545-550
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• 2006

2003$\sim$2005년의 쇠제비갈매기 Sterna albifrons의 번식기 동안 충남 홍성군 간월호의 번식군집에서 총 10개의 과산란수의 둥지(nest with supernormal clutch)와 7개의 이종 알 혼합 둥지(nests with mixed species clutch, 쇠제비갈매기와 흰물떼새의 알이 혼합된 둥지)가 관찰되었다. 쇠제비갈매기의 알 회수 행동은 한 배 산란수와 관계없이 두 번째 알 산란 이후 높은 빈도를 보였다. 알 회수 행동은 모든 포란 단계에서 매우 높은 빈도로 나타났다. 쇠제비갈매기는 둥지에서 약 15 cm 떨어진 알에 대하여 높은 알 회수 행동 비율을 보였으나 35$\sim$55 cm의 거리에서 급격히 감소하였고 60 cm 거리에서는 알 회수 행동이 나타나지 않았다. 쇠제비갈매기는 알의 종류 및 크기와 관계없이 둥지 인근에 배치된 알들을 자신의 둥지로 편입시키는 행동을 보였다. 본 조사 결과는 쇠제비갈매기의 알 회수 행동이 과산란수의 둥지 및 이종 혼합 둥지를 생성할 가능성이 있음을 시사한다.

• 한국동물학회:학술대회논문집
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• 한국동물학회 1997년도 한국생물과학협회 학술발표대회
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• pp.103.2-103
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• 1997

No Abstract, See Full Text

• 생명과학회지
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• 제19권11호
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• pp.1611-1616
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• 2009

본 연구는 1990년대 중 후반기(1995년, 1996년, 1998년)와 2000년대 중반기(2004년, 2005년)에 조사한 쇠제비갈매기의 번식에 관한 자료를 분석하여 낙동강 하구의 최남단에 위치하고 있는 신자도와 도요등에서의 쇠제비갈매기(Little Tern Sterna albifrons)의 번식 상황의 변화를 알아보고자 수행하였다. 신자도에서는 1995년에 쇠제비갈매기의 둥지 638개를 조사하였는데, 한배 산란 수는 평균 2.48개이었고, 1996년에는 총 106 둥지를 조사하였는데, 한배 산란 수는 2.35개이었으며, 2004년에는 총 94 둥지를 조사하였는데 한배 산란 수는 평균 2.16개이었다. 2005년에는 총 456 둥지를 조사하였는데 한배산란 수는 평균 2.53개 이었고, 4년간의 한배 산란 수에는 통계적으로 유의한 차이가 있었다(p<0.001). 도요등에서는 1998년에 총 263 둥지를 조사하였고 한배 산란 수는 평균 2.18개이 었고, 2004년에는 총 1,023 둥지를 조사하였는데 한배 산란수는 평균 2.33개이었으며, 2005년에는 총 1,123 둥지를 조사하였는데 한배 산란 수는 평균 2.52개 이었다. 3년간의 한배 산란수에는 통계적으로 유의한 차이가 있었다(p<0.001). 신자도에서의 쇠제비갈매기의 부화 성공률은 54.5%이었으며, D형 둥지와 A형 둥지에서 높았고 C형 둥지에서 낮았다. 부화 실패 요인으로서는 범람이 가장 큰 요인이었으며 특히 C형 둥지에서 그러하였다. 도요등에서의 부화 성공률은 73.2%이었으며, D형 둥지와 A형 둥지에서 높았고 C형 둥지에서 낮았다. 부화 실패요인으로서는 범람이 가장 큰 요인이었으며 특히 C형 둥지에서의 영향이 컸다. 낙동강 하구의 사주는 앞으로도 많은 변화가 예상되지만, 쇠제비갈매기 등의 번식지로서의 기능을 다하기 위해서는 포식자의 퇴치와 사주의 육화 방지와 모래가 있는 나대지를 유지하기 위하여 갈대제거 등 지속적인 관리가 절실히 요구된다.

• 한국환경과학회지
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• 제25권5호
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• pp.615-623
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• 2016

Bird species (BS) of the Nakdong River estuary (NRE) were selected to suggest conservation and management strategies, taking habitats and major threats into consideration. Five BS (Cygnus spp., Calidris alpina, Sterna albifrons, Fulica atra, and Anser fabalis) were selected following analysis of their dominance, national importance, seasonality, taxonomic group, and distribution within the NRE. The BS comprise two winter birds, one summer, one passage bird, and one resident bird. They can also be classified into four taxonomic groups: two under ducks and geese (Anatidae), and one each under gulls (Laridae), shorebirds (Scolopacidae), and diving birds (Rallidae). The results show that BS could be a useful tool in guiding estuary management because their habitats are clearly distinct, and include important areas of the NRE. A reduction of feeding and resting places-such as tidal flats, Scirpus planiculmis habitat, and agricultural farmland-and climate change are major threats to BS, therefore countermeasures to such threats should be considered in future estuary management plans.

• 한국환경과학회지
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• 제32권12호
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• pp.943-953
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• 2023

This study analyzed the ecological characteristics of the wetland protection area at tthe Nakdong River through vegetation and biota surveys, which showed that brackish water meets fresh water, a unique ecological environment has been created, biodiversity is high, and diverse habitats are distributed. Eleven plant communities, including four woody communities and seven grass communities, are distributed along the coast, and a total of 514 species, including 11 endangered wildlife species, were identified in terms of species diversity. Among them, the species diversity of the Eulsuk-do area was found to be relatively higher than that of other Barreir Islands areas. The presence of a population of Sterna albifrons on Sinja-do and a population of Eremias argus on Jinwo-do, an area outside the boundaries of the wetland protection area, confirmed the conservation value of the wetlands and the need to expand the boundaries of the wetland protection area. It is judged that this information can be used as basic information for a systematic conservation and management plan for the wetland protection area at the Nakdong River Estuary and as basic data to support the establishment of a policy.