• Title/Summary/Keyword: Chydoridae

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Redescdption of Two Chydorid Species of Genus Leydigia Kurz, 1875 (Branchiopoda, Anomopoda, Chydoridae) from Korea (한국산 넓은배물벼룩속 씨물벼룩류 2종의 재기재)

  • Yoon, Seong-Myeong;Kim, Won
    • The Korean Journal of Zoology
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    • v.36 no.3
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    • pp.380-390
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    • 1993
  • The freshwater cladocerans collected from the riverside of Han-gang and from the ricefields at Kojedo were identified as Leydigia leydigi (Schoedler, 1863) and L. ciliata Gauthier, 1939. These two species are redescrihed with illustrations. This is the first report of the chydorid species belonging to the genus Leydigia from Korea.

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Microcrustacean Community Dynamics in Upo Wetlands: Impact of Rainfall and Physiochemical Factor on Microcrustacean Community (우포늪의 미소갑각류 군집 동태: 강우량 및 이화학적 요인이 미소갑각류 군집 분포에 미치는 영향)

  • Choi, Jong-Yun;Kim, Seong-Ki;La, Geung-Hwan;Jeong, Kwang-Seuk;Kim, Hyun-Woo;Kim, Tae-Kyu;Joo, Gea-Jae
    • Korean Journal of Ecology and Environment
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    • v.45 no.3
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    • pp.340-346
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    • 2012
  • The relationships between environmental factors and the dynamics of the microcrustacean community, including planktonic or epiphytic cladocerans and copepods, were studied at Upo Wetlands from 2001 to 2010. Among 10 identified cladoceran taxon, epiphytic cladocerans (Alona, Camptocercus, Simocephalus, Diaphanosoma, Sida) and planktonic cladocerans (Bosmina, Ceriodaphnia, Daphnia, Moina, Scapholeberis) showed distinctive patterns in appearance throughout the year. Overall, epiphytic cladocerans were more abundant during the aquatic plant development season (May to Nov.), planktonic cladocerans were similarly distributed throughout the seasons, but showed a lower density than epiphytic cladocerans. The seasonal changes in copepods abundance showed a similar seasonal pattern when compared to epiphytic cladocerans. Planktonic cladocerans showed no significant relationship to rainfall and physico-chemical factors, while epiphytic cladocerans exhibited a distinct relationship with rainfall and water temperature (n=120, p<0.01), and a negative relationship with pH and conductivity (n=120, p<0.05). Among the epiphytic cladocerans, the Alona and Diaphanosoma showed a distinctive correlation with environmental factors, and their density was affected by rainfall and water temperature (n=120, p<0.01). Copepods had a positive relationship with rainfall (n=120, p<0.01) and water temperature (n=120, p<0.05). In conclusion, changes in rainfall and water temperature can affect the seasonal changes of microcrustacean community and abundance in Upo Wetlands.

Pre-Monsoon Dynamics of Zooplankton Community in the Yongwol West River Tributary (갈수기 영월 한반도지형 습지 주변 유수역의 동물플랑크톤 군집 동태)

  • Kim, Saywa
    • Korean Journal of Environmental Biology
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    • v.33 no.3
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    • pp.330-337
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    • 2015
  • Pre-monsoon dynamics of zooplankton community were investigated in Yongwol West River tributary; wetland shaped Korean Peninsula. Zooplankters were collected at three sites (stn 1: Yongwol West River, stn 2: Pyungchang River, stn 3: Jucheon River) monthly during the period between March and July 2014 except April. Totally 58 taxa of zooplankton occurred, consisting of 27 species of rotifer, 18 species of cladoceran, eight species of copepod, four kinds of aquatic insect larvae and one nematod. Lotic cladocerans of Alona spp. belonging to Chydoridae occurred frequently while typical lentic ones of Bosmina spp. and Daphnia spp. were not distributed, then sampling sites may be located in lotic waters. Zooplankton abundance recorded as $4,451-8,011indiv{\cdot}m^{-3}$ in Jucheon River but never exceeded $500indiv{\cdot}m^{-3}$ in other rivers. In Yongwol West River, dominant taxa were aquatic insect larvae from March through June and succeeded to cladocerans and copepods in July. Similar succession was observed in Jucheon River where aquatic insect larvae dominated in March and changed to cladocerans and copepods from May with high abundance. No such succession of zooplankton community was detected in Pyunchang River. Species diversity indices were the highest in Yongwol West River except in March. High values of dissolved oxygen ($9.0-11.0 mg{\cdot}liter^{-1}$) may show the characteristics of mountain streams. Water temperature increased gradually from $10.1^{\circ}C$ to $27.9^{\circ}C$ and pH varied within generally high range between 7.9-8.9, respectively. High value of pH seems to be derived from lime stone mines and cement factories around the studied area.