지원사업
학술연구/단체지원/교육 등 연구자 활동을 지속하도록 DBpia가 지원하고 있어요.
커뮤니티
연구자들이 자신의 연구와 전문성을 널리 알리고, 새로운 협력의 기회를 만들 수 있는 네트워킹 공간이에요.
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Developmental process and characteristics of eggs of the geoduck clam, Panope japonica are reporting in this study. Eggs and sperm were excised from gonad, artificially fertilized in an aquarium, reared under various temperature regimes, and record the larval period and the time need to reach a certain larval stage from fertilization.
Unfertilized eggs of P. japonica appeared to be oval with a mean diameter of 70 ㎛ and they became spherical after fertilization. The eggs of P. japonica can be classified as demersal. At a constant water temperature of 11℃, it took 4 hours form fertilization to become four-cell stage, two days to become trochophore larvae, three days to become D-shape larvae, twenty-three days to become umbo stage, and thirty-six days to become fully grown veliger ready for settlement.
A negative correlation was observed between the water temperature and the larval period of P. japonica. From fertilization to D-shape larvae, it took five days at 8℃, while it was only two days to become D-shape larvae at 17℃.
Time required to D-shape larvae from fertilization was proportional to temperature, and the relationships were expressed as follows :
To 8-cell stage, 1/t=0.0209 w-0.1167 (r=0.9967)
To blastula stage, 1/t=0.0055 w-0.0192 (r=0.9825)
To trochophore stage, 1/t=0.0034 w-0.0155 (r=0.9907)
To D-shape larvae stage, 1/t=0.0014 w-0.0023 (r=0.9843)
(t, time in hours ; w, water temperature)
Biological minimum temperature for egg development was calculated as 3.82℃ in average.
Unfertilized eggs of P. japonica appeared to be oval with a mean diameter of 70 ㎛ and they became spherical after fertilization. The eggs of P. japonica can be classified as demersal. At a constant water temperature of 11℃, it took 4 hours form fertilization to become four-cell stage, two days to become trochophore larvae, three days to become D-shape larvae, twenty-three days to become umbo stage, and thirty-six days to become fully grown veliger ready for settlement.
A negative correlation was observed between the water temperature and the larval period of P. japonica. From fertilization to D-shape larvae, it took five days at 8℃, while it was only two days to become D-shape larvae at 17℃.
Time required to D-shape larvae from fertilization was proportional to temperature, and the relationships were expressed as follows :
To 8-cell stage, 1/t=0.0209 w-0.1167 (r=0.9967)
To blastula stage, 1/t=0.0055 w-0.0192 (r=0.9825)
To trochophore stage, 1/t=0.0034 w-0.0155 (r=0.9907)
To D-shape larvae stage, 1/t=0.0014 w-0.0023 (r=0.9843)
(t, time in hours ; w, water temperature)
Biological minimum temperature for egg development was calculated as 3.82℃ in average.
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UCI(KEPA) : I410-ECN-0101-2009-529-015349630