• Title/Summary/Keyword: Introduced species

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Analysis Growth Characteristics of the Introduced Species Revegetated on the Highway Cut-slopes (고속도로 비탈면 녹화용 도입초종의 생육특성 분석)

  • 우보명;오구균;김봉년;조영채;전기성
    • Journal of the Korean Institute of Landscape Architecture
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    • v.26 no.1
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    • pp.12-20
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    • 1998
  • This study was carried out from June 1996 to November 1997 to analyze the growth characteristics of the introduced species revegetated on highway cut-slopes. The number of revegetation measures type surveyed were fourteen such as seed-spraying measures, block-sod pitching measures, and hydro-seeding measures with seed-fertilizer-soil materials. The introduced species for revegetation measures were mostly Festuca arundinancea(cool season grass), Eragrostic curvula(warm season grass), Lolium perenne(cool season grass), Dactylis glomerata(cool season grass), Poa pratensia(cool season grass). The species diversity index of the upper part on highway cut-slopes were greater than that of the middle part and lower part. The growth of introduced species was good on north-facing cut-slope than the others and that was flourish in temperate north forest zone. Also, the introduced species seemed to decrease or disappear, while the ratio of native woody and herb species which were in mature stage seemed to increase.

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Seasonal Variation of Reproductive Characters in Two Introduced Species of Taraxacum (두 외래종 민들레 번식 특성의 계절적 변이)

  • 강혜순;최유미
    • The Korean Journal of Ecology
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    • v.21 no.5_1
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    • pp.457.2-486
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    • 1998
  • Ecological success of introduced species is frequently attributed to the reproductive characters of those species. We examined the relationship between both flowering season and plant size and reproductive characters in two introduced species of Taraxacum, e.g., T. officinale and T.laevigatum. Seventy six plants of T. officinale and 23 plants of T. laevigatum were randomly tagged from a population at the sungshin Women's University in April of 1997. The size and number of vegetative characters such as rosette diameter, leaf number, and the largest leaf length and width were measured for each plant at the onset of flowering. The infructescence was collected continually from each plant before seed dispersal from April to August of 1997. The number of infructescence per plant, and seed number and total seed weight per infructescence were measured. Mean individual seed weight per infructescence was also obtained. T. officinale possessed larger sized, but smaller number of, leaves than T. laevigatum, thereby resulting in no significant difference in total leaf area. There was a trend that vegetatively larger plants in both of these species produced reproductive characters larger in size or greater in number, except for seed number and total seed weight per infructescence in T. laevigatum. All reproductive characters examined in T. officinale decreased toward the end of flowering season. In T. laevigatum, infructescence number per plant also declined during a flowering season: however, mean seed number per infructescence increaed toward the end of flowering season with no significant seasonal change in the total seed weight per infructescence. T. officinale produced on average about twice as many seeds per plant as T. laevigatum during a growing season. These two Taraxacum species produced quite small seeds in size compared to the endemic species, exhibiting a far better dispersal ability of introduced species. These data demonstrate that most reproductive characters decline in size and number in both species during a long flowering period, but the two species appear to employ different strategies to achieve reproductive success in disturbed habitats.

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Current status of alert alien species management for the establishment of proactive management systems in Korea

  • Son, Seung Hun;Jo, A-Ram;Kim, Dong Eon
    • Journal of Ecology and Environment
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    • v.45 no.4
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    • pp.237-254
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    • 2021
  • Background: Some of the introduced alien species introduced settle, multiply, and spread to become invasive alien species (IAS) that threaten biodiversity. To prevent this, Korea and other countries legally designate and manage alien species that pose a risk to the environment. Moreover, 2160 alien species have been introduced in South Korea, of which 1826 animals and 334 plants are designated. The inflow of IAS can have negative effects such as ecosystem disturbance, habitat destruction, economic damage, and health damage to humans. To prevent damage caused by the inflow of IAS in advance, species that could potentially pose a risk to the environment if introduced in South Korea were designated as alert alien species (AAS). Results: The designation criteria were in accordance with the "Act on the Conservation and Use of Biological Diversity" and the "Regulations on the Ecological Risk Assessment of AAS and IAS" by the National Institute of Ecology. The analysis result of risk and damage cases indicated that mammals affect predation, competition, human economic activity, virus infection, and parasite infection. Birds have been demonstrated to affect predation, competition, human economic activity, and health. It was indicated that plants intrude on the ecosystem by competing with native species with their high-population density and capacity to multiply and cause allergic inducement. Interestingly, 300 species, including 25 mammals, 7 birds, 84 fishes, 28 amphibians, 22 reptiles, 1 insect, 32 spiders, 1 mollusk, 1 arthropod, and 99 plants, are included in the list of AAS. Conclusions: AAS designation plays a role in preventing the reduction of biodiversity by IAS in South Korea and preserving native species. Moreover, it is determined to provide considerable economic benefits by preventing socio-economic losses and ecological damage.

Vascular plants of Poaceae (II) new to Korea: Holcus mollis L. and Aira elegantissima Schur

  • Cho, Yanghoon;Kim, Jonghwan;Lee, Byoungyoon
    • Journal of Species Research
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    • v.6 no.2
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    • pp.171-176
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    • 2017
  • Recent herbarium reexamination and field studies yielded two monocotyledonous plant taxa of the family Poaceae that could be documented in the national inventory list of species of Korea. These species, collected from Jeollabuk-do and Gyeongsangnam-do, were introduced and naturalized in Korea. Two species were identified as Holcus mollis L. and Aira elegantissima Schur. We provided the descriptions and descriptive photos of these species. Keys to the newly recorded species and related taxa were also provided.

Korean Names of Foreign Shells Introduced to Korea (국내도입 외래 연체동물 패각의 우리말 이름)

  • Lee, Jun-Sang;Min, Duk-Ki
    • The Korean Journal of Malacology
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    • v.23 no.1
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    • pp.105-154
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    • 2007
  • We have investigated introduced foreign molluscs into Korea since 1993. A total of 2,338 species of 157 families were investigated. Among them, 2,013 species of 106 families were gastropods, 307 species of 44 families were bivalves, nine species of two families were scaphopods, and nine species of four families in cephalopods. 2,128 species were newly given Korean name.

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Introduced Molluscan species to Korea (국내 유입 외래 연체동물)

  • Lee, Jun-Sang;Lee, Yong-Seok;Min, Duk-Ki
    • The Korean Journal of Malacology
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    • v.26 no.1
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    • pp.45-49
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    • 2010
  • Up until now, we have identified 17 exotic species of Mollusca in Korea. These include Achatina (Lissachatina) fulica, Limax flavus, Limax marginatus, Deroceras reticulatum, Hawaiia minuscula, Zonitoides yessoensis, Zonitoides arboreus, Physa acuta, Pomacea canaliculata, Pomacea insularus, Crepidula (Crepidula) onyx, Mytilus galloprovincialis, Xenotrobus securis, Perna viridis, Argopecten irradians irradians, Pinctada fucata, and Pinctada margaritifera. Among them Achatina (Lissachatina) fulica, Pomacea canaliculata, Pomacea insularus, Argopecten irradians irradians, Pinctada fucata, and Pinctada margaritifera were intentionally introduced, whereas remainings were unintentionally introduced into Korean fauna. These foreign species can be divided into three groups on the basis of their habitats: A. fulica, L. flavus, L. marginatus, D. reticulatum, H. minuscula, Z. yessoensis, and Z. arboreus in terrestrial habitat; P. acuta, P. canaliculata, and P. insularus in fresh water; and C. onyx, M. galloprovincialis, L. fortuneikikuchii, P. viridis, A. irradiansirradians, P. fucata, and P. margaritifera in sea water. Taxanomically, 11 species belong to Gastropoda, whereas 6 species are classified to Bivalvia.

Study of Freshwater Fish Fauna and Distribution of Introduced Species of Mankyeong River, Korea (만경강의 담수어류 및 외래어종의 분포)

  • Lee, Wan-Ok;Kim, Kyeong-Hwhan;Kim, Jong-Hwa;Hong, Kwan-Eui
    • Korean Journal of Ichthyology
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    • v.20 no.3
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    • pp.198-209
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    • 2008
  • During studies of the fish fauna and communities of Mankyeong River, which flows to the Yellow Sea, 14 families in 44 genera and 63 species of freshwater fishes were caught. Zacco platypus (27.7%) was the dominant species and Z. koreanus (11.3%) the subdominant species in this river. Twenty-three species of Korean endemic fishes appeared, and two of these, Pseudopungtungia nigra and Liobagrus obesus, represented endangered Korea species. Community structure of each branch stream was stable, showing appropriate dominant species: Z. koreanus in Jeonju Stream, Z. platypus in Kosan and Soyang Streams, and Carassius auratus in Mankyeong main stream. Three introduced species appeared: C. cuvieri, Micropterus salmoides, and Lepomis macrochirus. Among these introduced species, M. salmoides expanded its territory from midstream to downstream because of its strong carnivorous tendency and it favoring of lentic waters. This distribution of M. salmoides affected the number and distribution of small native freshwater fishes, especially those in the subfamily Acheilognathinae.

An inventory of alien mammals for ecological risk assessment in South Korea (생태계위해성평가 기반 마련을 위한 한국 도입 외래 포유류 목록 구축)

  • Park, Su-Gon;Lee, Do-Hun
    • Korean Journal of Environmental Biology
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    • v.38 no.1
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    • pp.165-178
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    • 2020
  • This study investigated the exotic mammals introduced to Korea to present the basic data necessary for ecological risk assessment and the establishment of an alien species management database. For this purpose, a list of alien mammals introduced to Korea was established by investigating alien mammals introduced for zoo exhibits purposes, alien mammals in breeding environments traded between individuals, and alien mammals introduced into nature. A total of 163 taxa were identified as alien mammals introduced to Korea. There were 139 taxonomic groups of ornamental alien mammals, including 11 orders, 44 families, 129 species and 10 subspecies; 28 taxonomic groups of alien mammals traded between individuals, including five orders and 19 families; and eight taxonomic groups of alien mammals introduced into nature, including four orders, seven families, seven species, and one subspecies. For the effective management of alien mammals introduced to Korea, it is important to collect basic information, such as a list of all species introduced, their populations, and introduced areas. It is also necessary to apply proactive management policies according to the degree of potential risk by preemptively evaluating the ecological risks that may arise from the introduction of alien species into natural ecosystems. For the eight taxonomic groups of Capra hircus, Cervus nippon taiouanus, Felis catus, Myocastor coypus, Oryctolagus cuniculus, Ondatra zibethicus, Ovis aries, and Rattus norvegicus identified to be introduced into the natural ecosystem of Korea, the provision of proliferation control measures at the national level, continuous monitoring of changes in diffusion trends, and immediate response based on the degree of change are required.

Floral Changes During Three Years After Cheonggyecheon Restoration (청계천 복원 후 3년간 식물상 변화)

  • Kim, Hyeong-Guk;Koo, Bon-Hak
    • Journal of the Korean Society of Environmental Restoration Technology
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    • v.13 no.6
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    • pp.107-115
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    • 2010
  • This study was surveyed to identify changes of flora during three years after restoration in Cheonggyecheon stream. There are four sections in Cheonggyecheon. One and two sections are upper streams and three and four sections are down streams. It was surveyed 328 species in 2006. In 2007 and 2008, 446 and 444 species were found, respectively. This result shows that Cheonggyecheon is unstable initial condition in restored stream ecosystem. Naturalized species were 58 species in 2006 and it was respectively 61 and 63 species in 2007 and 2008. Hazard species of ecosystem were three common species during survey period. In appearance of flora per section, three and four sections constituted by natural sites such as point bars, wide flood plains, riffles and ponds, marshes, etc. were surveyed more species than one and two constructed by concrete materials and narrow flow channel. Recently, as time goes by, introduced species are being increased. And succession has mainly been progressed by one year or binary herbs and perennial herbs. Compared with other restored streams, Cheonggyecheon showed more flora than Yangjaecheon and Anyangcheon. It is judged owing to length of surveyed site, various planted species and area of inhabitation space. To manage restored stream ecosystem, monitoring is essential. Further, because change of vegetation after restoration in Cheonggyecheon is very important, continuous monitoring about Flora and Naturalized species and Hazard species of ecosystem is also very important.

Molecular Classification of the Genus Grateloupia (Halymeniaceae, Rhodophyta) in Korea

  • Lee, Ju-Il;Kim, Hyung-Geun;Geraldino, Paul John L.;Hwang, Il-Ki;Boo, Sung-Min
    • ALGAE
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    • v.24 no.4
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    • pp.231-238
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    • 2009
  • The genus Grateloupia is the largest with more than 96 currently recognized species in the family Halymeniaceae, but morphological features of the genus are highly homoplasious making species identification difficult. In this study, we analyzed rbcL gene from 34 samples collected in Korea and compared the haplotypes of Korean species with those already published. The rbcL tree confirmed the occurrence of eight species in Korea: G. asiatica, G. catenata, G. divaricata, G. elliptica, G. imbricata, G. lanceolata, G. subpectina, and G. turuturu. All, except G. asiatica and G.catenata, been introduced from their native northeastern Asian waters to Australasian, European, and North American waters. The introduced haplotypes of G. lanceolata in Europe and North America were absent in Korea, while haplotype sharing of G. turuturu in Korea and Europe was common. Further sampling will show a source population of each introduced species and also provide a correct list of Grateloupia from Korea, including the other remaining 11 species of the genus.