• Animal Systematics, Evolution and Diversity
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• 제36권4호
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• pp.354-362
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• 2020

A common snapping turtle Chelydra serpentina inhabiting North America is internationally protected as an endangered species. It is known that the individuals of common snapping turtles were imported to South Korea as pets, and after being abandoned, some inhabit the natural ecosystem of South Korea like wild animals. No genetic survey has yet been performed for the common snapping turtles imported to South Korea. Hereby, cytochrome c oxidase subunit I (COI) information, which is 594 bp long, was determined for a total of 16 C. serpentina individuals, of which one was found in nature, twelve legally imported and their descendants, and the other three were provided from the Kansas Herpetological Society, USA. The obtained data were combined with thirteen COI sequences of C. serpentina retrieved from NCBI GenBank for the subsequent population genetic analyses. The results showed that there exist five haplotypes with high sequence similarity (only three parsimoniously informative sites). In the TCS and phylogenetic analyses, all the examined C. serpentina samples coincidently formed a strong monoclade with those collected mostly from Kansas State, USA, indicating that the imported ones to South Korea are from the central North America. In addition, there found the amino acid changes and the high degree of nucleotide sequence differences between C. serpentina and C. rossignoni with some important morphological characters. It is expected that the present results could provide an important framework for systematic management and control of exotic snapping turtles imported and released to nature of South Korea.

• 수산해양교육연구
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• 제29권3호
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• pp.702-710
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• 2017

Recently, in many reptiles (14 genera of turtles in five families), common characteristics of incubation temperatures are known to determine the sexes of hatchlings in many species of turtles, including the map turtles, painted turtles and snapping turtles, emys turtle, etc. According to many researcher's reports, in general, incubation at $25^{\circ}C$ (cooler temperatures) produces all or mostly males, however, incubation at $31^{\circ}C$ (higher temperatures) or higher produces all or mostly females. Exceptionally, even cooler temperature ($20^{\circ}C$) produce females, they produced all or mostly females. Accordingly, it is well-known that incubation temperature is the sex determining agent in these turtles. However, this paper presents study of the sex ratio and nest ecology in natural spawning nest: Observations on hatching sex ratios of eggs collected from natural nests of T. sinensis are similar to a previous report of the same genus Trionyx in the soft-shelled turtles. However, this genus (or species) showed some different phenomena to other kinds of turtles such as various kinds turtles mentioned above. After collection of naturally spawned eggs (17 eggs of T. sisnensis) on the natural nests, a laboratory experiment by the constant incubation temperatures was conducted with natural fluctuating soil temperatures in the natural nest with the soft-shelled turtle, T. sinensis. And also laboratory experiments were conducted using constant incubation temperatures of $25^{\circ}C$ (cooler temp.) and $30^{\circ}C$ (higher temp.) with the turtle, T. sinensis. Exceptionally, it was confirmed that the first and second incubation temperatures can't control sex-determination in the freshwater soft-shelled turtle, T. sinensis. The sex ratio approximated 1:1 (${\chi}^2=0.06$, P>0.05 (the Ist experiment). And the sex ratio approximated 1:1 independently of incubation temperature (${\chi}^2=0.33$, P>0.05 (the 2nd experiment). Consequently, temperature has no effect on sex determination in the genus Trionyx in a soft-shelled turtle.

• Applied Microscopy
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• 제25권2호
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• pp.39-52
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• 1995

Pinealocytes in the lower vertebrate are known to have photoreceptive function. These photoreceptor cells have been characterized morphologically in various species of lower vertebrates. No such ultrastructural studies, however, were reported in fresh water turtle. The purpose of this study is to characterize the pinealocytes and the phylogenetic evoluton of these cells is discussed in terms of functional analogy. I. Light microscopy: The pineal body was divided into incomplete lobules by connective tissue septa containing blood vessels, and parenchymal cells were arranged as irregular cords or follicular pattern. In the lobules, glandular lumina were present and contained often densely stained materials. II. Electron microscopy: The pineal parenchyma had three categories of cells: photoreceptor cells, supportive cells and nerve cells. The photoreceptor cells had darker cytoplasm compared to the supportive cells, and the enlarged apical cytoplasm(inner segment) containing abundant mitochondria and dense cored vescles protruded into the glandular lumen in which lamellar membrane stacks(outer segment), dense membranous materials, and cilia were present. Some of these lamellated membrane stacks appeared to be dege-nerating while others were apparently newly formed. Constricted neck portion of the photoreceptor cells contained longitudinally arranged abundant microtubules. centrioles and cross-striated rootlets. Cell body had well developed Golgi apparatus, abundant mitochondria, dense granules($0.5{\sim}1{\mu}m$), dense cored vesicles($70{\sim}100nm$), and rough endoplasmic reticulum occasionally with dense material within its cisterna. Basal portion of the photoreceptor cells had basal processes often with synaptic ribbons, which terminate in the complicated zone of cellular and neuronal processes. Synatpic ribbons often made contact with the nerve processes and the cell processes of neighboring cells. In some instances, these ribbons were noted free within the basal process and were also present at the basal cell mem-brane facing the basal lamina. Obvious nerve endings with clear and dense cored vesicles were observed among the parenchymal cells. Photoreceptor cells of the snapping turtle pineal body were generally similar in fine structure to those of other lower verterbrates reported previously, and suggested to have both photoreceptive and secretory functions which were modulated by pinealofugal and pinealopedal nerves. The supportive cells were characterized by having large dense granules($0.3{\sim}1{\mu}m$), abundant ribosomes, well developed Golgi apparatus and rough endoplasmic reticulum. These cells were furnished with microvilli on the luminal cell surfaces, and often had centrioles, striated rootlets, abundant filaments especially around the nucleus, and scattered microtubules. Some supportive cells had cell body close to the lumen and extended a long process reaching to basal lamina, which appeared to be a glial cell. Nerve cells within the parenchyma were difficult to identify, but some large cells located basally were suspected to be nerve cells, since they had synaptic ribbon contact with photoreceptor cells.

• 한국가정과교육학회지
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• 제12권2호
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• pp.47-64
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• 2000

The purpose of this study was to search the calcium and iron rich foods in Korean people. The food sources presented in the current home economics textbooks of middle and high school were investigated. And 40 kinds of calcium and iron rich foods were selected by the quantity in 100g edible portion. one serving size and according to 1997 food supply data. Also 3 major food groups of calcium and iron supply in Korean were identified, and 10 rich foods for each food groups were selected. The results were summarized as follows. 1. The food sources of calcium 1) The food sources of calcium presented in the home economics textbooks of middle and high school are milk and dairy products. small fishes such as anchovy icefish and dried strip and green vegetables etc. 2) The calcium rich foods by 100g edible portion were in order of skim milk powder river snail sesame sea mustard. whole milk powder. snapping turtle loach sea tangle(dried) opossum shrimp and sea lettuce(dried). And the calcium rich foods by the calcium content in one serving were in order of river snail snapping turtle opossum shrimp loach spiny lobster skate skim milk powder small alaska pollack freshwater crab condensed milk whole milk powder skate ray and milk. 3) The 3 major calcium supply food groups in Korean were vegetables fish and shellfishes and milk and dairy products. 4) The calcium supply foods according to the quantity of food supply in 1997 was in order of sea mustard, milk anchovy chinese cabbage soybean skin milk powder laver shrimp welsh onion and maize. The vegetables were the important sources of calcium in Korean. 2. The food sources of iron 1) The food sources of iron which are commonly presented in the textbooks of middle and high school were meat liver egg(egg yolk) and green vegetables etc 2) The iron rich foods on the basis of the iron content in 100g edible portion were in order of surf clam marsh clam laver(dried)( sea lettuce(dried), crayfish pelilla seed little neck clam orient hard clam, venus clam, and freshwater carab. And the iron rich foods by the iron content in one serving were in order of surf clam marsh clam crayfish little neck clam orient hard clam freshwater crab venus clam hen cockle green confertii(fresh) pen shell and spiny lobster. 3) The 3 major iron supply food groups in Korean were cereals an cereal products fishes and shellfishes and vegetables. 4) The iron supply food according to the quantity of food supply in 1997 was in order of soybean sea mustard maize rice meat edible viscera laver wheat flour, pook, red pepper, egg and bovine meat.

• 한국환경생태학회지
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• 제34권5호
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• pp.396-401
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• 2020

글로벌화가 진행됨에 따라 외래생물에 대한 문제가 점점 커지고 있으며, 전 세계적인 규모로 확대되고 있다. 국내의 경우, 야생에서 서식하는 외래종 중 외래거북이 발견되는 사례가 빠르게 증가하고 있다. 1970년대 처음으로 수입된 붉은귀거북(Trachemys scripta elegans)을 포함하여, 15여 종의 외래거북이 최근 국내 야생에서 확인되었다. 게다가, 2019년 10월 15일, 광주광역시에 위치한 풍암천에서 악어거북(Macrochelys temminckii) 한 개체가 발견되었다. 외래생물 관련 문제가 커지는 시기에 큰 크기와 공격적인 성향을 가진 악어거북의 발견 사례는 큰 이슈가 되었으며, 다수의 대중매체를 통해 기사화되었다. 이에 따라 본 연구에서는 악어거북 발견 기사에 달린 댓글(의견)들을 통해 대중들이 가지고 있는 외래생물에 대한 인식을 알아보고자 하였다. 악어거북 기사에 달린 댓글은 총 1,100개였다. 그 중 342개(31.1%)가 외래생물과 연관성을 보였다. 연관성이 있었던 글(n=342) 중 외래생물이 문제가 될 것이라는 댓글은 전체의 97.7%(n=334)였다. 외래생물이 문제가 되는 이유(n=42)에는 생태계교란(n=31, 73.8%)과 공격성(n=11, 26.2%)이 포함되었다. 외래생물 침입 문제가 발생하는 원인으로는 책임감 부재(n=122, 51.7%)가 가장 많이 언급되었으며, 무분별한 수입 및 거래(n=99, 42.0%), 관련 제도 부재(n=13, 5.5%), 처리 방법의 부재(n=2, 0.8%)가 뒤를 이었다. 대중은 외래생물 문제를 해결하기 위한 방안(n=129)으로 등록제(animal registration)의 필요성(n=59, 45.7%)을 가장 많이 언급하였다. 본 연구를 통해 대중이 외래생물에 대한 심각성을 인식하고 있음을 확인할 수 있었다. 본 연구에서 확인한 외래생물에 대한 대중들의 인식과 의견은 연구자와 정부가 충분히 참고할 필요가 있으며, 추후 외래생물의 관리를 위한 정책 방향을 설정하는데 중요한 근거가 될 것이다.

• 대한지리학회지
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• 제41권3호
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• pp.283-300
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• 2006

본고는 남북경제협력 사업인 개성공단 개발사업으로 남 북한 모두에게 장소의 의미가 커진 북한 개성시의 자연경관특성을 지명을 통해 살펴본 것이다. 본 연구는 북한의 문헌분석, 탈북자와 개성공단 북한 근로자를 대상으로 한 심층면담, 그리고 두 차례의 개성 현지답사를 통해 진행되었으며, 주요한 연구 결과는 다음과 같다. 첫째, 지명에 나타난 개성지역 산지의 특성은 산지의 구성비율이 높고 산의 형태가 둥근 모양과 삿갓 모양이 많으며, 산과 하천으로 둘러싸인 곳은 잦은 안개발생과 하천침식에 의한 돌이 많은 것이 특징이다. 둘째, 지명에 나타난 개성의 하천은 모래의 양이 많고 유황이 불안정하며 일부 개풍군 및 판문군 일대의 하천은 조석의 영향을 받는 것이 특징이다. 넷째, 지명에 투영된 동 식물은 그 서식환경이 개성지역의 자연환경과 유사한 것이 특징이다. 넷째, 토양, 벼랑, 벌, 바위와 관련된 기타지명에서 토양 특히 붉은 토양과 관련된 지명은 개성의 북부 산지지역에 분포하고, 벼랑과 관련된 지명은 벼랑 발달의 원인이 되는 하천 연안에 분포하는 것이 특징이다. 그리고 평야를 의미하는 벌 관련 지명은 사천강의 지류인 서암천 연안에 분포하고, 바위 관련 지명은 산과 하천 그리고 마을이 혼재되어 있는 곳에 분포하는 것이 특징이다. 결론적으로 북한개성지역은 남북경제협력 사업이자 평화구축 프로젝트인 개성공단 개발사업과 개성관광사업으로 남 북한 모두에게 지역 자체가 차지하는 비중이 매우 크다. 하지만 개성지역이 북한 땅이기 때문에 자료접근이 어렵고 기초연구가 거의 이루어지지 않은 실정이다. 따라서 개성지명에 관한 본 연구는 지역정보를 담고 있기 때문에 향후 개성지역을 관리하고 운영하는데 기초자료를 제공할 수 있을 것으로 사려된다.