• 한국수산과학회지
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• 제55권2호
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• pp.171-182
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• 2022

The habitat degradation caused by large-scale reclamation leads to devastating impacts, such as fine sediment and mud shrimp Upogebia major settlement on Manila clam Ruditapes philippinarum aquaculture in the eastern Cheonsu Bay tidal flats, Republic of Korea. Despite these impacts, there is a lack of studies on the influence of fine sediments on tidal flats that constitute key mud shrimp habitats. This study provides information on the seawater-sediment environment and the influence of dissolved inorganic nitrogen (DIN) fluctuations depending on mud shrimp burrow hole density. Additionally, it discusses countermeasures for Manila clam habitat management. The results show that mean DIN effluxes in areas with a high-density of burrow holes were up to 4 times (0.12 mmol m^-2 d^-1) higher than those in sites of low-density (0.03 mmol m^-2 d^-1) within the Saho and Songhak-ri tidal flats. To manage interference within the competition zone of Songhak-ri tidal flat, it is important to utilize the settlements of spawning season in all three dimensions. Consequently, additional studies in other tidal flats are essential and research in zones where mud shrimps and juvenile clams coexist will help to determine the priorities in the efficient management of clam aquaculture.

• Animal Systematics, Evolution and Diversity
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• 제25권2호
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• pp.205-207
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• 2009

The specimens of Peregrinamor ohshimai, an ecto-commensal species to Upogebia major, were collected from the mudflat of Chilcheondo Is., Geoje-si, Gyungsangnam-do, Korea and diagnostic characters of P. ohshimai were analyzed. The genus Peregrinamor is reported in Korean fauna for the first time.

• 수산해양기술연구
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• 제55권4호
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• pp.310-319
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• 2019

Although mud shrimp (Upogebia Major) provides benefits on the tidal flat ecosystem, it is causing the mass mortality of Manila clam (Tapes philippinarum) and large economic loss to the aquaculture farmer due to spreading in the entire coastal clam farm area of the West Sea of Korea. In this study, a mud shrimp blocking box for cultivating clam was tested to prevent the mud shrimp from invading the habitat of the clam. To determine the effect of the blocking box, the growth characteristics of the clams under various culture conditions were investigated. The shell length, total weight, condition index, the presence of mud shrimp in the box, and the soil decay in the box were examined according to whether the clams were raised in the box or in natural state, whether the box is covered with a net or not and the gap size of the box. As a result, no significant differences in shell length, total weight, and condition index were found between the clam grown in the box and the natural state (P>0.05) without any evidence of invading of mud shrimp to the box. In addition, the soil inside the box was in good condition, not decayed. Therefore, using the mud shrimp blocking box, mud shrimp can be prevented from propagating to the habitat of the clam, thereby contributing to the normal production of the clam and thus to restoring the clam farming.

• 한국해양학회지:바다
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• 제28권4호
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• pp.143-157
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• 2023

본 연구는 바지락과 쏙의 서식 구역이 대비되는 보령 주교 갯벌의 인위적인 환경 영향에 의한 저서동물 군집 특성을 확인하였다. 조사 기간 내 대형저서동물은 총 55종이 출현하였으며, 평균 서식밀도는 338 ind./m², 생체량은 212.2 gWWt/m²이었다. 출현 종수는 상부(27종)에서 하부(37종)로 갈수록 증가하였고, 우점종은(상부: 둥근가시사자머리참갯지렁이, 중부: 고리버들갯지렁이, 하부: 바지락) 조위별로 다르게 나타났다. 집괴분석과 다차원척도법을 이용한 상위 10종의 저서동물 군집구조는 하부의 바지락 어장과 쏙 서식공 밀도가 높은 중부 정점 중심의 두 그룹으로 나뉘며, 특정 생물 종의 영향을 반영하였다. 쏙 서식 공간의 퇴적물 입도 조성은 변동 폭이 컸으나 연간 유지되었으며, 분급은 2.1 𝜑로 낮아져 같은 입자로 구성된 비율이 증가하였다. 특히, 중부는 인위적인 영향이 높음에도 고리버들갯지렁이가 우점하고, 쏙 서식공 밀도와의 연관성을 보여 이는 종간 상호작용에 기인하는 것으로 판단된다.

• Animal Systematics, Evolution and Diversity
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• 제29권2호
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• pp.152-159
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• 2013

As a result of continuous taxonomic studies on the Korean crabs, two varunid crabs, Hemigrapsus takanoi Asakura and Watanabe, 2005 and Sestrostoma toriumii (Takeda, 1974), are newly reported from Korean waters. Hemigrapsus takanoi, as a sibling species of H. penicillatus, has not been recognized in Korean waters, and this species occurs in the sympatric habitat with H. penicillatus in the Korean peninsula. Sestrostoma toriumii (Takeda, 1974) is associated with thallassinid Upogebia major (De Haan, 1841) and echiuran Urechis unicintus (Von Drache, 1881) as the case of S. balssi (Shen, 1932). The Korean S. toriumii showed smaller size than those mentioned in the original description. Their illustrations and pictures are provided with descriptions, and the distributions of these species in the Korean peninsula are also provided.

• 한국해양학회지:바다
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• 제26권3호
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• pp.167-182
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• 2021

본 연구는 충남 보령 학성리 갯벌 조간대에서 대형저서동물의 시·공간적 분포 및 군집구조를 파악하고, 환경요인에 따른 군집구조 변동을 알아보고자 하였다. 현장조사는 2016년-2017년에 계절별로 9개 정점에서 캔코어(13 cm × 22 cm × 30 cm)를 이용하여 각 정점마다 3회 반복 채취 수행하였다. 퇴적환경은 전반적으로 니질 함량이 60% 이상이었으며, 유기물 함량은 평균 2.3%이었다. 대형 저서동물은 총 79종이 출현하였고, 평균서식밀도는 611 ind./m², 평균생물량은 64.1 gWWt/m²이었다. 상위 우점종은 니질 갯벌에 서식하는 고리버들갯지렁이(Heteromastus filiformis), 칠게(Macrophthalmus japonicus)와 쏙(Upogebia major)이며, 서식밀도는 각각 297 ind./m²(48.6%), 62 ind./m²(10.1%), 42 ind./m²(6.9%)으로 나타났다. 집괴분석으로 분류된 3개의 정점군은 물리·화학적인 환경요인 보다는 생물상호 작용과 우점종 출현비율 등으로 구분되었으며, nMDS 분석으로 살펴본 대형저서동물 군집은 계절적 변동양상을 보였다.