• Title/Summary/Keyword: inhabitation

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Changes in Chemical Property of Soil Affected by Termites (Reticulitermes speratus kyushuensis Morimoto) in Korea (국내 흰개미(Reticulitermes speratus kyushuensis Morimoto)에 의한 토양의 화학적 특성 변화)

  • Seong, Se Ha;Kim, Keun Ki;Hong, Chang Oh;Park, Hyean Cheal
    • Journal of Environmental Science International
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    • v.26 no.6
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    • pp.789-795
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    • 2017
  • Termites (Isoptera) are classified into approximately 3,106 species. In Korea, only one species has been identified, which is Reticulitermes speratus kyushuensis Morimoto. The termite, a social insect, is known to play an important role in nutrient cycling of the ecosystem, although some species of termites are well-known pests attacking wooden structures or any plant materials. However, there is a lack of research about termites in Korea, including aspects such the taxonomy, physiology, and ecology of termites. This study was carried out to provide valuable basic data on the ecological role of termites in an ecosystem in Korea for the future studies. For the experiments, soil and termite samples were randomly collected from Mt. Hwajang located in Jikdong-ri, Eonyang-eup, Ulju-gun, Korea between October 5 and 30, 2015. Analysis results showed that there were no significant differences in soil chemical properties between the soil samples just after air-drying and one year elapsed without any treatment. The treated soil with termites showed significantly higher than the soil without termite treatment. Chemical properties of total nitrogen, organic matter, available phosphate, pH, Calcium(Ca), Potassium(K) and Magnesium(Mg) in soil treated with termites were $1.11{\pm}0.3gkg^{-1}$, $43.3{\pm}12.4gkg^{-1}$, $27.4{\pm}2.9mgkg^{-1}$, $4.56{\pm}0.2$, $0.82{\pm}0.2cmol_ckg^{-1}$, $3.18{\pm}1.4cmol_ckg^{-1}$, $1.73{\pm}1.1cmol_ckg^{-1}$, respectively. The values of soil property of without termite treatment were $0.56{\pm}0.1gkg^{-1}$, $30.5{\pm}3.1gkg^{-1}$, $24.0{\pm}4.7 mgkg^{-1}$, $4.09{\pm}0.1$, $0.71{\pm}0.2cmol_ckg^{-1}$, $2.88{\pm}1.5cmol_ckg^{-1}$, $1.30{\pm}0.7cmol_ckg^{-1}$, respectively. These results suggest that inhabitation of termites could improve soil chemical properties in an ecosystem.

Effects of Artificial Vegetation Island on Fish Fauna (인공수초섬이 어류상에 미치는 영향)

  • Byeon, Myeong-Seop;Park, Hae-Kyung;Jeon, Nam-Hui;Choi, Myeong-Jae;Kong, Dong-Soo
    • Korean Journal of Ecology and Environment
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    • v.40 no.1
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    • pp.103-109
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    • 2007
  • To investigate the effects of artificial vegetation island (AVI) on fish distribution, we compared fish fauna from artificial vegetation island (AVI) area, which installed in 2000, natural vegetation area (NVA) and vegetation-free area (VFA) at Kyungan Stream area of Lake Paldang from Jul. to Nov., 2005. Results showed that 11 families 23 genera 24 fish species were distributed in the AVI and NVA. Squalidus japonicus coreanus, a small-size fish which generally lives at the downstream, dominated absolutely in the individual numbers. However, only 6 families 11 genera 12 species of fishes caught at the VFA, and dominant fishes were Hemibarbus labeo and Erythroculter erythropterus, a medium to large-size migratory fishes which live in mid-depth of water column. The dominance index was high at the AVI (0.778) and NVA (0.868), whereas the diversity index and evenness index were high at the VFA. Fish distribution at AVI was similar to that of the NVA in numbers of species, indicating that the AVI could playa role as spawning and inhabitation zone to a variety of fishes. We believe that AVI may be used for a restoration of the damaged and disturbed littoral ecosystem.

Seasonal Variations of Water Quality in the Coastal Sea of Jungmun Resort Complex in Jeiu Island (제주도 중문관광단지 연안해역 수질의 계절변동)

  • Jang Seung-Min;Choi Young-Chan
    • Journal of the Korean Society for Marine Environment & Energy
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    • v.5 no.2
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    • pp.3-18
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    • 2002
  • This study has been carried out to find the water Quality in coastal sea of fungmun area, southern Jeju Island. In-situ observations and water sampling had been made every month from July 1997 to June 2000. The distributions of water temperature and salinity over the study area have been 13.8~27.0℃ and 30.0~34.7‰, respectively. Salinity is showed low salinity from June to September (rainy season) because of rain. Tsushima Warm Waters (TWW) as ≥15℃ and ≥34‰ influence the adjacent sea around Jeju Island all year round. Yangtse Coastal Waters (YCW) influence the surface layer around Jeju from June to September and so strong stratification (termocline, halocline) resulted at the depth of between 20~30m at outer-sea. However the stratification does not happen even in summer at inner-sea, which seem to be caused due to vertical mixing by wind, waves and tides. A water mass of high value of water temperature and salinity (respectively 14.1~17.7℃, 33.9~34.1‰) stayed at the lower layer in outer-sea all the year round. It is probably formed by mixing between TWW and YSBCW(Yellow Sea Bottom Cold Water). The mean value of DO was the lowest in summer and the highest in winter. COD and TH were the highest in summer and the lowest in winter. However, TP showed the lowest value in summer season, because the mean value of N/P ratio was over 16. The mean of N/P ratio was under 16 in other seasons. The phosphate would be a limiting factor in the growth of phytoplanHon in summer. Nitrate would be a limiting factor in other seasons. Distribution of chlorophyll a did not show any seasonal change in the study period, but especially increased during April and May in the first year(1998) and the second year(1999) all over the study area, which suggested that phytoplankton inhabitation distributed widely in the study area. The space averaged values were the highest for TIN in rainy season and lower for TP in rainy season than in other seasons. It suggests that river runoff influences the inner-sea.

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Monitoring Vegetation Changes after Constructing the Vegetation-mat Measures for Greening in Embankment - A Case Study of Tancheon, Seongnam - (호안 녹화용 매트 시공 후 식생변화 모니터링 - 성남시 탄천을 중심으로 -)

  • Lee, Soo-Dong;Kang, Hyun-Kyung;Jang, Han-Sol
    • Korean Journal of Environment and Ecology
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    • v.24 no.3
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    • pp.302-317
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    • 2010
  • In this study, not only to present the management plan but also to verify the effectiveness for a area of improving the landscape and the area of creating the base of bio-inhabitation in Tancheon stream concrete embankment where were practised the vegetation-mat measures for greening via monitoring i.e. restoration progress. The results of monitoring, there were a total of 41 taxa, 18 families, 38 species, 3 varieties in 2006, moreover in the 2007, there were a total of 59 taxa, 19 families, 56 species, 3 varieties and in the period 2008, 64 taxa, 29 families, 59 species, 8 varieties. Therefore, these site has increased the plant spaces year by year. The distribution of vegetation characteristics shows that Miscanthus sacchariflorus and Pennisetum alopecuroides expands their influence in the area of applying the construction method. Those area appears a diversity of native species by the stream deposition at the flood. Thus, its condition is very soundly ecological health and eco-friend. At present, native species have been dominant, however, disturbed species and invasive species can be expected to increase dramatically in the future. Therefore, it is necessary to a long-range monitoring and management for maintaining an environmentally sound aquatic ecosystem. On this area refer to mix the river vegetation of primary succession and disturbed vegetation. For that reason, the method of constructing the vegetation-mat measures for greening in embankment does not need to remove the concrete and can install a coir-mat on the top. It leads to improve the landscape, moreover, it was analysed the such dramatic changes in the vegetation species richness by providing continuous the plant growth basis have a impact on in bio-diversity.

The Environmental Characteristics and Vegetation Structures of Kirengeshoma Koreana Habitats (나도승마 서식지의 환경적 특성과 식생구조)

  • Cho, Seon-Hee;Kim, Dae-Woo;Kang, Sang-Ho;Jeong, Yeo-Hong;Lee, Sung-Jae;Kim, Joon-Sun
    • Journal of Korean Society of Forest Science
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    • v.102 no.3
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    • pp.446-454
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    • 2013
  • The present study investigated the biological agents and environmental conditions of the habitats of the Kirengeshoma koreana, a class 2 endangered species class according to the South Korean Ministry of Environment (MOE), elucidated the structural characteristics of the forest stands in the habitats with the importance value and the diversity index, conducted comparative analysis of the factors, and explored their relationship with environmental factors. According to the results of direction analysis of natural habitats of the Kirengeshoma koreana, the direction was distributed to the north or the northeast, and the slope amounted to $15-40^{\circ}$, thus demonstrating that the slope has little effect. In addition, the results showed that the distribution of Kirengeshoma koreana populations dramatically increased starting in areas at least 600 m above the sea level and that the relative light intensity was 3.79% on an average. Most populations were native to gorges and crevices between rocks so that they mainly tended to inhabit areas that could see soil loss in times of precipitation. In addition, a considerable number of the populations were close to hiking trails as well, thus leading to concerns about their artificial destruction. The soil of layer a in the main growth space of the Kirengeshoma koreana was analyzed and turned out to be strongly acidic, measuring pH 4.45-4.89 (average: 4.68). All investigation sections were typical natural broad-leaved tree areas, and, judging from the fact that the Kirengeshoma koreana was most likely to appear in colonies of the Mongolian oak tree (Quercus mongolica Fisch. ex Ledeb.), the Mongolian oak tree seems to be the species of tree that has the greatest effect on the inhabitation of the Kirengeshoma koreana.

User′s Effects on Avifauna in Chiak Mountain National Park (치악산 국립공원의 이용객이 야생조류의 서식에 미치는 영향)

  • 김준선;김갑태;공영호;고상현
    • Korean Journal of Environment and Ecology
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    • v.2 no.1
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    • pp.37-49
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    • 1988
  • This study was conducted to investigate the user's effects on the avifauna in Chiak Mountain National Park. The survey was carried over 5 districts which were 3 main trail (valley) by line transect method from May to October 1988. The observed birds were 44 species and 613 individuals. these consist of 22 species for residents, 13 species for summer visitor, 5 species for winter visitor and 4 species for passage migrant. The average density of birds was 2.96 ea/ha, and main dominant species were Panus minar, Paradoxomis webbiana fulvicanda, Panus palustris hellmayri and Parus ater amurensis in order. The observed frequency of wild-birds was 6.77 times/km in average. No. of species, species diversities and observed frequency were lower in main trail of high user's density than sub trail and closed trail, especially in summer. But similarity indices were affected by inhabitation environments than user's density. Therefore, from now, in Chiak Mountain National Park management, the enjoyment oriented activities will be regulated and the control of trail use on main trail are necessary during breeding periods for wild birds protection.

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Habitat Suitability Assessment of the Saemangeum Lake Area for Eurasian Otter(Lutra lutra) and Correlation Analysis with Spatial Variables (새만금호 일대 수달의 서식적합성 평가 및 공간변수와의 상관성 분석)

  • Shin, Hwa-Yong;Shin, Gee-Hoon;Han, Sung-Yong;Rho, Paikho;Lee, Joon-Woo
    • Journal of Environmental Impact Assessment
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    • v.29 no.4
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    • pp.298-306
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    • 2020
  • This study was conducted to examine the impact of the correlation between habitat suitability of the Saemangeum lake area for otters and spatial variables (watersides, wetlands, farmlands, urban areas, roads, etc.) on the inhabitation of otters. As a result of the habitat suitability analysis, it was found that 380grids of 1097 grids (34.6%) studied are most suitable and suitable, whereas 413 grids of 1097 grids (37.7%) of the total are marginal and unsuitable. Comparatively analyzing otter traces data against for each spatial variable in the Saemangeum area revealed that the distance to the road or man-made areas is directly proportional to the number of otter traces, while more traces of otters were found areas close to waters. Despite the impact from the internal construction of Saemangeum lake, there found 2 to 6 times more otter traces in the area farthest from the urban areas and roads compared to the area nearest to the urban areas and roads. Thus, when restoring habitats for otters, a minimum of 500(m) distance to roads or urban areas, which can be considered as a threat to the habitats, must be secured.

Comparison of Digestive Organ and Body Composition among the Cultured, Wild and Released Fish, 1-Year Black Sea Bream (Acanthopagrus schlegeli) (양식, 방류 및 자연산 감성돔 1년어의 소화기관 및 체성분 비교)

  • JI Seung Cheol;Yoo Jin Hyung;JEONG Gwan Sik;MYEONG Jeong Gu;LEE Si Woo;GO Hyeon Jeong
    • Korean Journal of Fisheries and Aquatic Sciences
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    • v.37 no.6
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    • pp.462-468
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    • 2004
  • In order to evaluate adaptation to the environment in released fish, digestive organ and body composition were compared among 1-year old cultured (CUL), released (REL) and wild (WIL) Black Sea Bream, Acanthopagrus schlegeli. Hepatosomatic index (HSI) of the REL was significantly lower than those of the CUL and WIL fish, but intestine weight index (IWI) of REL was significantly higher than those of the CUL and WIL fish. There were no significant differences in stomach weight index (SWI) and condition facto. (CF) among those different fish groups. The number of pyloric caeca of the REL and WIL fish were 4, but the $30{\%}$ of CUL fish was 3 counts. The moisture content of whole body in the WIL fish was significantly higher than the CUL and REL fish, but significant lowest in the crude lipid of whole body. The content of moisture and crude protein of dorsal muscle were no significant differences among the CUL, REL and WIL fish, but crude lipid content of WIL fish was significantly lower than the CUL and REL fish. Moisture content of CUL fish in the liver was significantly lower than the REL and WIL fish, and crude lipid was significant lowest in the WIL fish. Amino acid content of dorsal muscle in the WIL fish was highest in the total amino acid, EAA and E/A ratio, and CUL fish was highest EAA and E/A ratio in liver. EPA content in dorsal muscle of WIL fish was lower than CUL and REL fish, and the REL fish was highest in DHA content of the fatty acid. EPA content in liver of WIL fish was lower than CUL and REL fish, and DHA content in REL and WIL fish was highest and lowest. Crude protein content of CUL and WIL fish in the scale was significantly higher than REL fish, but there were no significant differences in contents of crude lipid and ash. Ca and P of scale were formed most of mineral and content of P in CUL fish was significantly higher than those of REL and WIL fish. There were no significant differences in Mg, K, Na and S of scale, but CUL fish was significantly lower than REL fish in C1. The results suggest that difference of digestive organs and body composition concluded it from differences of inhabitation environment and feed formulations.

A Survey on the Present Condition of Winter Birds in the estuary of Nakdong River (낙동강하구(洛東江河口)의 겨울새 현황조사(現況調査))

  • Ryu, Hwan Jeang;Kim, Jai Saing
    • Journal of Korean Society of Forest Science
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    • v.63 no.1
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    • pp.1-8
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    • 1984
  • These surveys were conducted to estimate the winter bird population inhabiting in the estuary of Nakdong River by unit distances, by unit times, by sections and by observation points. The results were summarized as follows: 1) A total of 70,032 birds were observed, which composed of 82 species under 27 families. 2) An average of 2,103.06 individuals per kilometer was observed and 23,344.00 individuals per hour. Anatidae showed the most dominance (65.13% of the total), followed by Scolopacidae(14.55%), and Laridae(7.28%). 3) The present population by areas were observed as follows; 61.8% of the total in the tideland and swamp, 31.9% in the surface of water, and 6.4% in the air and land, respectively. 4) Among the five sections, the greatest population was observed in section 3 which figured 22,852 individuals (30.0%), and the least in section 4 (9.8%). 5) In this observation point, six species such as Anas platyrhynchos, Tadorna tadorna, Anser albifrons, Aythya ferina, Calidris alpina and Larus crassirostris were the most dominant birds inhabiting which reached 83.1% of the total.

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Study on Community Structure of Benthic Macro-Invertebrates Inhabiting in an Urban Restoration Stream, Gongchon-cheon, in Incheon City (인천시 도시복원하천 공촌천의 저서성대형무척추동물의 군집 구조에 관한 연구)

  • Song, Yeong-Ju;Ju, Yong-Don;Park, Bo-Sun;Lee, Hee-Jo;Chae, Do-Young;Kim, Jong-Myung;Bae, Yang-Seop
    • Journal of Wetlands Research
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    • v.16 no.4
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    • pp.371-378
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    • 2014
  • The subject of this study is the Gongchon-cheon which is one of the largest streams in Incheon and is closely related to lives of citizen. Comparative analysis is made on the changes of the environment and the ecological condition of Gongchon-cheon after the stream naturalization construction which is completed in July 2009. From the results of the survey, 32 species in 2004, 22 species in 2009 and 46 species in 2010 have been recorded. The number of the species decreased from 2004 to 2009 due to the disturbance of the river environment, and it increased in a short time from 2009 to 2010 because of the recovery of the environment. It demonstrates the stream naturalization construction providing enough environments (dikes and rapids) for the benthic macro invertebrates. The result of the present study is similar with the river's biology index, ESB index, and KSI index, and also it is similar with the pattern of the appearance, which illustrates that the species decreased during the naturalization construction, and increased after the stabilization since the finish of the naturalization construction, and it has been confirmed that the naturalization construction provides the better environment for the inhabitation of organisms.