• Journal of Species Research
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• 제10권4호
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• pp.364-386
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• 2021

Six species of the family Kelleriidae, including four new species, are recorded from tropical waters of the Asia-Pacific, two of them from Phuket Island, Thailand, one each from Bohol Island, Philippines and Phu Quoc Island, Vietnam, and two from Kosrae Island, Micronesia. A new genus Kelleriella is proposed to accomodate one of these new species (Kelleriella quadridens n. sp.). There are three diagnostic features of the new genus: the terminal segment of antenna is armed with one strong claw and six setae, the armature of the maxilliped endopod is reduced, and the third exopodal segment of leg 4 is armed with four spines and five setae. The other three new species are Kelleria latipes n. sp., Kelleria phuketensis n. sp., and Kelleria robusta n. sp. As diagnostic features of these new species, their caudal rami are about 2.5, 3.2, and 1.72 times longer than wide, respectively, the exopod of leg 5 of them is smooth, without any process, about 1.9, 3.7, and 2.9 times longer than wide, respectively, and armed with one spine plus one seta in Kelleria latipes and Kelleria phuketensis or with 2 setae in Kelleria robusta. Additionally, Kelleria javaensis Mulyadi, 2009 is synonymized with Kelleria regalis Gurney, 1927 and Kelleria grandisetiger Kim, 2006 is synonymized with Kelleria andamanensis Sewell, 1949, and both species are redescribed.

• Journal of Species Research
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• 제11권4호
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• pp.239-252
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• 2022

Afrolaophonte koreana sp. nov. is described from the intertidal zone of two sandy beaches on the south coast of Korea. This is the first record of the genus Afrolaophonte Chappuis, 1960 in the Northern Pacific. The new species is most similar to A. aequatorialis Cottarelli and Mura, 1981, described from the Maldives and subsequently also found in Papua New Guinea, but could be distinguished by numerous characters, including the segmentation of the third leg endopod in male, armature formula of the second leg in both sexes, length of caudal rami in both sexes, and length of some setae on the fourth leg in female. Afrolaophonte ensiger Wells and Rao, 1987 from the Andaman and Nicobar Islands is established as a junior subjective synonym of A. aequatorialis. To test previous phylogenetic hypotheses based on intuitive methods, a parsimony based cladistic analysis of 13 valid congeners is performed using 15 morphological characters and one outgroup. Only one of three previously proposed species-groups is supported with a synapomorphy, while one was clearly based on symplesiomorphies. Our current knowledge of morphology in this genus is not sufficient for postulating interspecific phylogenies, which also renders previous zoogeographical hypotheses untestable.

• Ocean and Polar Research
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• 제44권3호
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• pp.261-267
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• 2022

We derived a length-weight relationship for Calanus sinicus off Busan, Korea in spring to estimate the biomass of the C. sinicus population around Korean waters, and compared it with the previously derived equations. The developmental stages and prosome length of C. sinicus used in the relationship ranged from 1,376-1,540 ㎛ for copepodite 4 (CIV), 1,753-1,971 ㎛ for copepodite 5 (CV), and 2,160-2,283 ㎛ for adults (CVI). Dry weight and carbon content were measured from a total of 26 replicates. Length-weight relationships derived in the present study are as follows: log C = 3.342 log PL - 9.449, log DW = 3.394 log PL -9.219, where C is carbon content (㎍), DW is dry weight (㎍), and PL is prosome length (㎛). When comparing the present regression equation of length-weight for C. sinicus with the previous one, our regression equation showed an average carbon estimate to a given range of mean prosome length. The length-weight relationship of C. sinicus in the present study can be used to better estimate the biomass of the C. sinicus population in the coastal waters of Korea.

• 한국물환경학회지
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• 제39권3호
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• pp.215-222
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• 2023

Zooplankton are primary consumers in the food web connecting primary producers and predators such as small fish, playing an important role in energy transfer in aquatic ecosystems. Therefore, it is essential to understand the zooplankton community structure in material cycle and energy flow in aquatic ecosystems. Zooplankton in large rivers with a low flow rate would distribute vertically as in lakes. In this study, we collected zooplankton by surface water filtration and vertical haul method with 64 ㎛-mesh plankton net at three stations (ND-1, ND-2, ND-3) in Nakdong River fortnightly from June 2018 to December 2019. Species composition and individual densities were analyzed. All three stations showed differences in relative abundance of zooplankton groups between surface water and vertical integrated water, with the largest difference shown in the deepest station, ND-2. In vertically integrated water at ND-2, the relative abundance of rotifera was low by a maximum of 25% and that of cladocera was high by a maximum of 22% compared to surface water samples. These results indicate that surface water filtration method is not enough to represent the community structure of zooplankton compared to the vertical haul method in large rivers.

• 한국어류학회지
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• 제21권4호
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• pp.253-261
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• 2009

만경강에 서식하는 참종개와 점줄종개의 서식환경과 섭식생태를 2005년부터 2006년까지 조사하였다. 참종개와 점줄종개는 중 상류지역에 혼서하고 있었으나 미소서식지에서 참종개는 유속이 비교적 빠르고 수심 30~60 cm의 돌이 쌓인 곳에서, 점줄종개는 유속이 느리고 수심이 30~100 cm의 모래지역에서 서식하여 차이를 보였다. 두 종은 모두 주행성 어류로 3월부터 10월까지 활동기로, 11월부터 2월까지는 월동기로 나타났으며, 월동기간동안 참종개는 자갈과 돌이 쌓인 곳에, 점줄종개는 모래가 쌓인 곳에 파고 들어가 은신하였다. 참종개는 깔다구류와 수서곤충을 주로 섭식하였으며, 점줄종개는 깔다구류와 요각류, 물벼룩류를 주로 섭식하였고, 섭식률은 두 종 모두 4월과 9월에 높게 나타났으나 겨울동안은 섭식하지 않았다.

• Animal Systematics, Evolution and Diversity
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• 제34권3호
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• pp.127-142
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• 2018

A new species of Eudactylopus Scott A., 1909 is described from the southern coast of Korea. The specimens were collected using a light trap set overnight at the entrance near a pier. Eudactylopus yokjidoensis n. sp. is similar to E. andrewi Sewell, 1940 and E. spectabilis (Brian, 1923) in two key respects: similar length of proximal and distal inner setae on female P2 enp-2, and modification of two subapical setae on male P2 endopod. However, E. yokjidoensis can be differentiated from the two species by following morphological characteristics: in females, the length ratio of cephalothorax/2nd-4th thoracic somites combined is smaller in E. yokjidoensis than other two species (1 : 0.8 vs. 1 : 1); antennule has nine segments (vs. 7-segmented in E. andrewi); P2 to P4 each bears a process in medial distal margin of basis, while it is just smooth in E. spectabilis; in males; the length ratio of cephalothorax to 2nd-4th thoracic somites combined is smaller in E. yokjidoensis than other two species (1 : 0.6 vs. 1 : 1 in E. andrewi and 1 : 0.8 in E. spectabilis); and P5 exopod has a comb-like innermost seta, while it is bipinnate seta in E. spectabilis. To prove the Korean species of Eudactylopus to be new, full descriptions of both sexes are given here, and the claim is supported by distinct genetic differences between E. yokjidoensis and E. spectabilis (22.3-22.7%) in the mitochondrial gene cytochrome oxidase subunit I(mtCOI) sequence.

• Animal Systematics, Evolution and Diversity
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• 제18권2호
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• pp.233-244
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• 2002

딱정장수노벌레 (Canthocamptus)속의 mirabilis 종군에 대한 분류학적 연구의 일환으로. 극동아시아의 남부에 널리 분포하는 반달딱정장수노벌레 (C. semicircuius Kikuchi)와 남한의 중서부 지역의 구릉지대 계류에 분포하는 1신종. 고려딱정장수노벌레 (C. coreensis)를 보고한다 반달딱정장수노벌레의 한국산 표본에서는 암컷의 바깥꼬리털과 수컷의 제3다리 외지의 돌기형 가시와 같은 중요 형질에서 변이가 흔하게 나타났기에 종내변이에 대해 특기하였다. 고려딱정장수노벌레는 암컷에서 수컷모사변이형의 꼬리마디가 나타나지 않고 항문판의 투명막이 둥근모양을 유지한다는 점 등의 조상형 형질을 유지하는 반면. 수컷 제3다리 외지 제2마디의 바깥가시와 수컷 제4다리 외지 끝마디 바깥강모가 심하게 변형되는 등의 파생형질을 소유한다. 현재까지 기록된 5종의 한국산 딱정장수노벌레속 mirabilis 종군에 대한 종검색표를 작성하였다.

• 한국해양학회지
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• 제29권1호
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• pp.1-4
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• 1994

완도 해역에서 1990년 4월에서 1991년 3월까지 숙주 어류인 풀망둑을 월별 채집하 여 기생성 요각류 Acanthochondria brevicorpa를 조사하였다. 감염률은 숙주 크기와 양의 상관이었다. 기생성 요각류는 전장이 24 cm 이상되는 어류에서만 채집되었다. 숙 주가 잡히지 않아 1990년 4, 6, 7월의 자료를 얻을 수 없었음에도 불구하고 A. brevicorpa의 감염률과 감염강도에서 뚜렷한 계절변동이 나타났다. 채집된 어류 83마 리 중 34.9%가 요각류가 전혀 발견되지 않았다. 포란한 요각류는 2월과 5월 사이에 나 타났으며, 5월에 가장 많이 출현하였다. 요각류의 유생 중 CC에서 CIII 유생은 조사기 간에 1마리도 채집되지 않았으며, 3월과 5월에 CIV와 CV 유생이 약간 발견되었을 뿐이 었다. 본 연구결과에서 요각류 A.brevicorpa는 주로 봄에 생식하고, 추가적인 숙주를 포함하는 생활환을 갖는 것으로 추정되었다.

• 미생물학회지
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• 제41권3호
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• pp.157-163
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• 2005

요각류 Paracyclopina nana Acetate Kinase를 클로닝하였다. 전체 open reading frame은 1,200 bp이었으며, poly(A) signal sequence가 ORF에 내재되어 있었다. 분자계통학적 분석결과 P. nana acetate kinase 유전자는 진핵생물계 곰팡이류인 Aspegillus와 같은 branch를 형성하였고, P. nana acetate kinase가 다른 원핵미생물들의 acetate kinase와는 구별되며 fungi와 같은 branch에 존재하는 것을 확인하였다. 또한, E. coli를 이용하여 원핵세포 발현벡터를 이용한 단백질 발현 유도를 통하여 P. nana acetate kinase 단백질 분자량이 약 50 kDa에 이르는 것을 확인하였다. 이 자료는 본 요각류와 다른 생물의 acetate kinase 단백질의 생화학적 특성비교에 유용하게 쓰이리라 사료된다.

• Journal of Species Research
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• 제5권3호
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• pp.289-299
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• 2016

Extensive survey of invertebrates in Korea, led by the National Institute of Biological Resources in Incheon, continues to uncover many new and endemic species, but also elements of neighbouring faunas that were previously unknown here. Hemicyclops tanakai Itoh and Nishida, 2002 was originally described from estuarine mud-flats in Tokyo Bay, Japan. We report one male and two females from a sandy beach on Jeju Island, which represent its first record in Korea and second record ever. No morphological differences were observed between these two disjunct populations, so we expect more records of this species in Korea and Japan. Tisbe ensifer Fischer, 1860 was originally described from Madeira and later on reported from numerous other parts of the Northern Atlantic, as well as from the Indian Ocean. We report two females from a shallow littoral in Sokcho, which represents its first record in Korea and the first record in the entire Pacific Ocean. Because of morphological discrepancies reported in previous records we recognize that this species might be in reality a species complex, and we only tentatively identify our Korean specimens as T. cf. ensifer. We provide numerous light photographs of both species in addition to short descriptions, in hope that they might elucidate global problems of their zoogeography and dispersal of small marine invertebrates in general. Further samplings from Korea and other parts of the world will be necessary to test our identifications and phylogenetic relationships of Korean populations with molecular and other tools.