• Title/Summary/Keyword: water spider habitat

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Survey and Analysis of Insect Species in the South Korea Habitat (Yeoncheon) of the Water Spider, Argyroneta aquatica (연천군 물거미 서식지의 곤충상 조사 및 군집분석)

  • Kang, Juwan;Park, Taechul;Park, Junyeong;Kim, Jihun;Jeong, Youngmoon;Park, Jung-Joon
    • Korean Journal of Environmental Biology
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    • v.35 no.4
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    • pp.476-491
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    • 2017
  • The water spider (Argyroneta aquatica), a rare member of its species, is one of the few insects known to live under water all over the world. In Korea, the water spider can be found only in the Eundae-ri, Yeoncheon, Gyeonggi province, where they are designated as a natural monument. However, loss of habitat is obvious, as the Eundae-ri wetland undergoes hydrarch succession. Loss of habitat has a direct impact on the water spider population. Thus protective measures for the water spider are needed to preserve the water spider habitat. In this study, a sweeping and visual survey of insect species was conducted in the water spider habitat from May to September 2015. The characteristics of each one of the different insect species and the community features were analyzed in this study. A total of 3,929 insects representing 276 species from 13 orders collected for the analysis. The most frequently collected insects from the Order Hemiptera represented 24.2% of total species and 82.3% of the total number of insects. Community analyses showed dominance, diversity, evenness, and richness indices of 0.23, 2.27, 0.41, and 31.2, respectively. Compared with the previous survey data, these results showed that reduction of the spider's wetland habitat caused the most commonly collected insects to adapt and spread to the surrounding terrestrial environment.

Hydrological Properties of the Water Spider Habitat in Yeoncheon (연천 은대리 물거미 서식지의 수문적 특성)

  • Yang, Jae-Hyuk
    • Journal of The Geomorphological Association of Korea
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    • v.26 no.1
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    • pp.107-119
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    • 2019
  • In recent years, the drying of the water spider habitat has been progressing rapidly. This is the primary cause of extreme climatic events in 2014/2015 with overall reduction in annual precipitation, but impermeable clayey layer formed in the superficial formation also plays an important role. The clayey layer is a critical factor in the formation of wetlands on a well-drained lava plateau, but paradoxically, it restricts the connection with ground water, increasing the instability of the water balance and making it precipitation-dependent structure. In addition, construction of roads/drainways has also caused drying of wetlands by blocking or rapidly spilling surface water/sheet flow. Therefore, to keep the wetlands sustainable, it should increase the flow into the wetlands by removing the road/drainways and floodgates installed to reduce the outflow.

Distribution of Vegetation and Geomorphology Characteristics of the Water Spider(Argyroneta aquatica) Habitat in the Jeongok Lava Plateau, Central Korea (전곡 용암대지 물거미 서식지의 지형특성과 식생 분포)

  • Lee, Min Boo;Lee, Sang Young
    • Journal of The Geomorphological Association of Korea
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    • v.24 no.4
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    • pp.57-73
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    • 2017
  • The formation of the lava dam of the paleo lake blocked the entrance to the Chatancheon River on the Jeongok lava plateau and it suddenly transformed the terrestrial ecosystem into the aquatic one by the overflow. The spiders in the lava dam adapted in the wetland and evolved into water spiders that could survive by forming bubble houses. Since then, the lava dam was connected to the present Hantangang River due to the dissection and the lake became a terrestrial environment, a small area of marsh composed of primarily clay soil layer. Change in water level of the habitat and thus the extension of the terrestrial area made the species a endangered now. This study carried out frequency of occurrence, degree of wetness and plant habitats of the vascular plant in the water spider habitat. As a result of this study, total 180taxa are of 55 (30.6%) wetland plant groups and of 113 (62.8%) upland plant groups except facultative plant groups. Among the wetland plant groups, the Isachne globosa community occupied the largest area, where the water spiders were most observed. The result of this study, the classification and the types of vascular plant species, would provide useful information for the sustaining healthy wetland ecosystem and the restoration of the habitat for the water spiders.

Geomorphological Characteristics of the Water Spider Habitat in Yeoncheon (연천 은대리 물거미 서식지의 지형적 특성)

  • Yang, Jae-Hyuk
    • Journal of The Geomorphological Association of Korea
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    • v.25 no.4
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    • pp.77-88
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    • 2018
  • Wetlandsis developing on the lava plateau in Eundae-ri, even though there are no majorstreams into this area. As a result of drilling, 1~2m clay layer is founded under the superficial formations of the wetland, which are the main reasons for formation of the wetlands by limiting vertical drainage. The clay layer's Granulometry/XRD show very different characteristics from in situ weathering of basalt, and since 2~3cm of sand layer exist within the profile, the clay layer seems to be supplied and deposited from outside through surface/sheet flows. To keep the wetlands sustainably, the supply of water into the wetlands has to be increased by restoring the surface/sheet flow which is limited or deformed by pavement road.

Management Strategies and the Relationship between Argyroneta aquatica and Environmental Factors in Aquatic Ecosystem (천연기념물 물거미(Argyroneta aquatica)와 수생태 환경 요인과의 관계와 관리 방안)

  • Jeong, Heon Mo;Kim, Hae Ran;Cho, Kyu Tae;Lee, Seungyeon;You, Young Han;Hong, Seungbum
    • Korean Journal of Ecology and Environment
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    • v.52 no.2
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    • pp.136-142
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    • 2019
  • Water spider(Argyroneta aquatica) inhabits only a small size wetland in Eundae-ri, Yeoncheon-gun. In this study to investigate environmental factors influencing on population of A. aquatica, we analyzed the relationship between density of A. aquatica and various physicochemical and biological factors. Density of A. aquatica increased with small habitat area and high $NH_4$ and electric conductivity. The relationship between density of A. aquatica and prey or predator was low but the water spider decreased with density of Pomacea canaliculata. And density of A. aquatica was not related to the coverage of emergent plant. However density of A. aquatica decreased as the increase of floating plant and increased as the increase of submerged plant. These results indicated that aquatic plants are important in the habitat environment of A. aquatica. Therefore we suggest necessity of management strategies for the invasive species, P. canaliculata which is a notorious predator of aquatic plants.