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의암호 (衣岩湖) 패류에 (貝類) 관한 연구 (5) - 칼조개 ( Lanceolaria acrorhyncha ) 의 생식시기에 관한 조직학적 연구 -
권오길,박갑만 ( Oh Kil Kwon,Gap Man Park ) 한국하천호수학회 1985 생태와 환경 Vol.18 No.3·4
Authors have studied the size of eggs, the seasonal gonad changes, the spawning season and the demibranchs morphology of Lanceolaria acrorhyncha in the Lake Uiam. These researches were studied during the period from April 1983 to September 1984. The results of these investigations were summarized as follows; Mean diameter of the eggs was gradually increased from March (311 ㎛) to November and the mean diameter of maximum and minimum egg size was 282㎛ and 71㎛, respectively. The gonad in the female was filled with the connective tissue and the egg-sacs from March to November. The egg-sac was constricted after discharging of eggs and the connective tissue was gradually increased. The outer demibranchs of females served as marsupial(gravid) pouch. And the secondary water-tubes remain after discharging of the glochidia, and the central water-tubes served as ovisacs only in the primary water-tubes. The marsupial demibranchs lacked the divided system. The size of the marsupial demibranchs on the spawning seasons was increased three times.
담수삿갓조개(Pettancylus nipponicus)의 산란(産卵)과 발생(發生)에 관(關)한 연구(硏究)
권오길,이준상,박갑만,Kwon, Oh-Kil,Lee, Jun-Sang,Park, Gap-Man 한국패류학회 1986 The Korean Journal of Malacology Vol.2 No.1
Pettancylus nipponicus (freshwater limpet) collected from the Lake Choon Cheon were cultrued in aquarium and studied in the respects of an egg deposition and the developmental characters of cleavage. The species were collected only in the Lake Uiam and Choon Cheon and easily sampled on the debris like vinyls and cans. Those smooth surfaces were suitalble substrata for attaching. P. nipponicus, about 4 mm in adult, deposited an egg in one calcareous egg-capsule on the aquarium walls, while many eggs are surrounded in a jelly-like egg-envelope in the most gastropods. And another special features was that an egg-capsule was consisted of two valves and the suture was opended as hatching. A diameter of its egg was $55{{\mu}m}$ and the length of an egg capsule was $620{{\mu}m}$ and $510{{\mu}m}$ in long and short diameter, respectively. It took about 8 hours from beginning cleavage to 16-cell stage and about one year to become an adult.
의암호산(衣岩湖産) 재첩 (Corbicula fluminea)의 산란(産卵)과 발생(發生)에 관(關)한 연구(硏究)
권오길,이준상,박갑만,Kwon, Oh-Kil,Lee, Jun-Sang,Park, Gap-Man 한국패류학회 1986 The Korean Journal of Malacology Vol.2 No.1
Corbicula fluminea, one of the 2 species in the family Corbiculidae living in the Lake Uiam, was used as an experimental material and the embryonic development and the structure of glochidia of this species were investigated. This freshwater mussels was oviparous, but some ovoviviparous: incubated their youngs in the inner-demibranchs or outer-demibranchs, however, chiefly used the inner-demibranchs as brood-pouch. The average time required from a fertilized egg to two-cell stage, veliger stage, and glochidium was 76 minutes, 3 hours, and 17 hours, respectively, The mean size of glochidium was $168{\mu}m$ in shell height, $195{\mu}m$ in shell lengh, $114{\mu}m$ in hinge legth and the form of glochidium was D-type and had no hooks or hooklets for attaching to fish like Unioidae.
남(南)·북한강(北漢江) 담수산(淡水産) 패류(貝類)의 분포상(分布相)에 관(關)한 연구(硏究)
권오길,조동현,박갑만,이준상,Kwon, Oh Kil,Cho, Dong Hyun,Park, Gap Man,Lee, Jun Sang 한국패류학회 1985 The Korean Journal of Malacology Vol.1 No.1
The investigation of freshwater molluscs in the South Han River was carried out from 1984 and in 1985. The authors selected 12 stations and collected freshwater snails and mussels. We here publish the catalogue of molluscs in South and North Han River. The catalogue of molluscs in the South Han River is as follows; two classes, four orders, six families including twenty species(Semisulcospira coreana, Semisulcospira globus, Semisulcospira gottschei, Semisulcospira forticosta, Parafossarulus manchouricus, Gabbia misella, Radix auricularia coreana, Austroppepleaollura, Limnoperma lucustris, Lamprotula gottschei, Lanceolariaacrorhyncha, Unio douglasiae, Unio sp, Solenaia triangulalis, Anodonta fukudai, Anodonta woodiana, Corbicula felnouilliana, Corbiculafluminea, Corbicula sp).
의암호의 (衣岩湖) 패류에 (貝類) 관한 연구 (6) - 수정또아리 , Polypylis hemisphaerula 의 산란과 발생에 관한 연구 -
권오길,이준상,박갑만 ( Oh Kil Kwon,Jun Sang Lee,Gap Man Park ) 한국하천호수학회 1986 생태와 환경 Vol.19 No.1·2
Polyplis hemisphaerula (Planorbidae) collected from the rice field and the pond near the Ch`unch`o^˘n City was used as material for researching on the egg deposition and cleavage. The samples were transfered to the aquaria controlled at 28℃ and many characters of the species were studied for three years from 1983. The shell height and width of the adult were 1. 5 mm and 5. 2 mm, respectively. In a certain occassion the method of removement was floating on the waters as Radix. The eggs were surrounded by an egg envelope made up of the jelly-like substances and an average number of the fertilized eggs contained in an envelope was 4. 2 counted 119. The mean time required from two-cell stage to four-cell stage, from 4 to 8, 8 to 16-cell was seventeen minutes respectively and the hatching period was about 4.5 days.
의암호의 (衣岩湖) 패류에 (貝類) 관한 연구 (7) - 의암호산 (衣岩湖産) 재첩 ( Corbicula fluminea ) 의 생식소와 반새에 관한 연구 -
권오길,이준상,박갑만 ( Oh Kil Kwon,Jun Sang Lee,Gap Man Park ) 한국하천호수학회 1987 생태와 환경 Vol.20 No.1
Corbicula fluminea, one of two species in the family Corbiculidae living in the Lake Uiam was used as an experimental material. This research was done in order to identify and describe the visceral sex, the demibranch morphology, and the seasonal gonad activity. The sexuality of C. fluminea was male, male-hermaphrodite (with a preponderance of testicular tissue over ovarian tissue), hermaphrodite (with approximately equal amount of male and female gonadal tissue), female-hermaphrodite (with a preponderance of the ovarian tissue), and female. The non-marsupial demibranch (namely, outer 2 in females and femalehermaphrodite, two in males and male-hermaphrodites) was divided by the secondary septa that produced secondary watertubes, resulting in triparitite organization. But, the outerdemibranch of all kinds has exhibited feebly the triparitite organization. In this species larvae were produced over two extended time periods, one in spring (oviparity) and one in fall (ovoviviparity).