• Animal Systematics, Evolution and Diversity
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• 제38권4호
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• pp.205-213
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• 2022

A new free-living marine nematode, Chaetonema longicorpus sp. nov., was discovered in a subtidal benthic habitat around the Uljin nuclear power plant in the East Sea. Chaetonema longicorpus sp. nov. differs from other Chaetonema species in its very long body length, relatively long cephalic setae, long and narrow buccal cavity, bottle-shaped amphideal fovea, short spicules, only one pre-cloacal seta instead of a pre-cloacal supplement, and conspicuous ventral swelling at the middle of the tail. Herein, we provide a taxonomic description and illustrations of this new species using differential interference contrast microscopy. Furthermore, an illustrated pictorial key to all valid species, including the new species and comparative tables on the biogeographical and morphological characteristics of the genus Chaetonema, are provided.

• 한국환경생태학회지
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• 제27권3호
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• pp.357-368
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• 2013

본 연구는 한반도 풍혈지 식생에 대하여 ZM학파의 식물사회학적 방법을 통해 식물군락의 특성을 밝히고 풍혈지의 보전 및 관리에 필요한 기초자료를 제공을 목적으로 수행되었다. 풍혈지는 지하에 저온층이 존재하는 크고 작은 바위들의 집적지로서, 지표면에 열려진 공극으로부터 자연적인 냉풍이 불어 나와 국소적으로 저온환경이 형성된 지역이다. 63개 식생조사 자료를 이용하여 풍혈지의 식물군락을 구분한 결과, A. 굴참나무-한들고사리군락, B. 신갈나무-박달나무군락, B-1. 졸참나무-가는잎쐐기풀하위군락, B-2. 마가목-인가목조팝나무하위군락, B-3. 털댕강나무-개병풍하위군락, B-4. 전형하위군락의 2개 군락 4개 하위군락으로 구분되었다. DCCA분석 결과, 굴참나무, 쥐똥나무, 느티나무, 분꽃나무 등을 구분종으로 하는 굴참나무-한들고사리군락은 신갈나무, 쉬땅나무, 함박꽃나무, 당단풍나무, 민둥인가목 등을 구분종으로 하는 신갈나무-박달나무군락보다 온량지수와 강수량이 많은 지역과 높은 상관관계를 나타냈다. 인가목조팝나무, 마가목, 흰인가목, 산앵도나무, 산겨릅나무, 퍼진고사리, 전나무을 구분종으로 하는 마가목-인가목조팝나무하위군락과 구분종을 가지고 있지 않은 전형하위군락은 다른 하위군락에 비하여 높은 해발과 많은 강수량 지역에 분포하였으며, 당조팝나무, 털댕강나무, 개병풍, 산토끼고사리, 북분취, 일본잎갈나무 등을 구분종으로 하는 털댕강나무-개병풍하위군락은 인간활동에 의하여 일광 노출이 많은 지역에 분포하였다.

• 대한본초학회지
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• 제29권6호
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• pp.133-140
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• 2014

Objectives : Paemo is a phlegm-resolving drug with cold properties and classified 5 kinds which come from 11 species of original plant. All the more, according to literature record, 20 species of original plant were used. As a natural result, these are easily to confuse and there are a lot of counterfeit product. So we are to present a differential standard of Paemo. Methods : It was planed a differential standard form through outer appearance of the original plant and outer appearance in the form of each medicines which was collected local market or field for 11 species which is listed in Korea or China pharmacopeia. Results : It was possible to distinguish the orignal plant between Fritillaria and Bolbostemma through its stem shape. In Fritillaria of original plant, it was possible to distinguish through its width of leaf, number of leafy bracts, color and position of flower and shape of leaf apex. In outer appearance in the form of each medicines, there are difference in color and texture of medicine between Fritillaria and Bolbostemma and there are difference in size, shape, size of inner and outter fleshy leaf of bulb, pattern of surface and apex of fleshy leaf of bulb among 10 Fritillaria species. Conclusions : This study presents various differences in the outer appearance of the original plant and the outer appearance in the form of each medicines among Paemo. It will be helpful to further applied research.

• Journal of Plant Biology
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• 제34권4호
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• pp.341-347
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• 1991

The character and differential species of Abies koreana community, a subalpine coniferous forest, on Mt. Hall a and its vegetation unit were reviewed, based on literature published up to date. Song and Nakanish (1985a) originally described Saso-Abietetum koreanae Song et Nakanishi 1985 for the community. At that time, we were fully justified in establishing the nomenclature. Nevertheless, against this nomenclature, Yim and Kim (1990) made a objection, and it was renamed as what is called Saso quelpaertensi-Abietetum koreanae (Song et Nakanishi) corr. Yim et Kim 1990. In their previous study(Yim et al., 1990) being the root of the nomenclature, however, they did not study on the full layers containing the moss layer of bryophyte and lichen for the stratification of the Abies koreana community, in spite of the importance of the species of moss layer for the selection of character and differential species of vegetation units belonging to Vaccinio-Piceetea Br.-Bl. 1939, and also the floristic composition from their study was not compared with that of the vegetation units of the subalpine coniferous forests in Korea Peninsula, Japan, Maritime Province of Siberia and Northeast China. Among the four character species selected by them, it is clear that Maianthemum bifolim and Lonicera maackii are species no having the characteristic value from the phytosociological viewpoint. Besides, Sasa quelpaerthensis described in their nomenclature is a synonym of S. palmata (Suzuki, 1978). Therefore, their nomenclature is invalid and comes under a contravention (Infringement of Priority) to the Code of Phytosociological Nomenclature (Barkman et al., 1986). Saso-Abietetum koreanae was amply justified also by author's recent study (Song, 1991)examined throughout the range of subalpine coniferous forest in Korea. With the discussion of justification of Saso-Abietetum koreanae, a association discussion was brought in the present review.

• 한국환경생태학회지
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• 제29권5호
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• pp.791-802
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• 2015

백두대간 조침령-신배령 구간의 응복산을 대상으로 2012년 4월부터 2013년 8월까지 영구조사구를 설치하여 조사하였다. 총 25개소($20{\times}20cm$)의 산림식생조사 자료를 토대로 Z-M식물사회학적 방법에 의해 식생유형 분류를 수행하였다. 그 결과, 최상위 수준에서 신갈나무군락군이 분류되었으며, 군락단위에서는 난티나무군락과 물개암나무군락으로 세분화 되었다. 난티나무군락은 철쭉군과 산딸기군으로 나누어지며, 산딸기군은 다시 태백제비꽃소군과 줄딸기소군으로 분류되어 총 4개의 식생단위로 분류되었다. 사면의 해발고에 따른 중요치는 교목층에서 신갈나무의 중요치가 높게 나타났으며, 아교목층에서는 당단풍이 높게 나타났다. 따라서 향후 교목층에서 신갈나무가 아교목층에서는 당단풍나무로 유지될 것이다. 종 다양성 분석결과 식생 단위 3에서 0.974로 가장 높게 나타났으며, 식생단위1에서 0.725로 가장 낮게 나타났다. 종간연관 분석 결과 크게 4개의 유형으로 구분되었고, 이는 식생단위의 식별종 및 표징종과 일치하는 경향이었다. 특히 그룹 I은 철쭉의 식별종과 일치하는 경향이었으며, 그룹 III은 물개암나무군락에서 주로 출현하는 식물종으로 이루어진 그룹으로 나뉘어졌다.

• Kyungpook Mathematical Journal
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• 제48권3호
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• pp.515-527
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• 2008

We investigate a three species food chain system with a Holling type IV functional response and impulsive perturbations. We find conditions for local and global stabilities of prey(or predator) free periodic solutions by applying the Floquet theory and the comparison theorems.

• Journal of applied mathematics & informatics
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• 제27권5_6호
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• pp.1097-1107
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• 2009

In this paper, three species stage-structured predator-prey model with time delayed and periodic constant impulsive perturbations of predator at fixed times is proposed and investigated. We show that the conditions for the global attractivity of prey(pest)-extinction periodic solution and permanence of the system. Our model exhibits a new modelling method which is applied to investigate impulsive delay differential equations. Our results give some reasonable suggestions for pest management.

• ALGAE
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• 제25권3호
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• pp.121-131
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• 2010

Thalassiosira species were collected from October 2007 to January 2009 in an attempt to better understand species diversity of the genus Thalassiosira in Korean coastal waters. A total of 5 Thalassiosira species (T. concaviuscula, T. oceanica, T. partheneia, T. simonsenii and T. nanolineata) were identified here. Most species in this study were of small size, and 5 species were recorded for the first time in Korean coastal waters. Using a scanning electron microscope (SEM), we described distinctive characteristics of fine structure that proved to be important diagnostic characteristics for the identification of each species. The most important diagnostic characteristics for Thalassiosira species identification were the marginal strutted processes, the position of labiate processes, and the areolation. The differential characteristics of the species studied were: T. concaviuscula has a double layered external tubes on the marginal strutted processes; T. oceanica shows marginal ridges that are interlinked between the marginal strutted processes; the valve face of T. partheneia is fairly convex and its labiate process is positioned midway between two strutted processes; T. simonsenii is characterized by two labiate processes and somewhat coarse areolae; and, T. nanolineata has several central strutted processes and linear areolation.

• Kyungpook Mathematical Journal
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• 제48권3호
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• pp.503-514
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• 2008

We investigate a three-species food chain system with Lotka-Volterra functional response and impulsive perturbations. In [23], Zhang and Chen have studied the system. They have given conditions for extinction of lowest-level prey and top predator and considered the local stability of lower-level prey and top predator eradication periodic solution. However, they did not give a condition for permanence, which is one of important facts in population dynamics. In this paper, we establish the condition for permanence of the three-species food chain system with impulsive perturbations. In addition, we give some numerical examples.

• 환경생물
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• 제37권3호
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• pp.396-405
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• 2019

A new species of free-living marine nematode is described from intertidal sediments of the East Sea, Korea. Phanoderma koreense sp. nov. is characterized by the presence of well-developed pharyngeal and cephalic capsule, six inner labial sensilla present as minute papillae around with circular groove, long and slender spicules with 4-5 serrated distal end, located at the base of the precloacal supplement, a series of eight to nine stout and short setae on the ventral cloacal region and conico-cylindrical tail with two pairs of blunt setae. In this study, we provide taxonomic descriptions and illustrations of a new species by differential interference contrast microscope and a pictorial key to the valid species of Phanoderma Bastian, 1865. This is the first record of the genus Phanoderma in the East Sea, Korea.