期刊论文详细信息
Marine Ecology Progress Series
Effect of hydrostatic pressure on eggs of Neocalanus copepods during spawning in the deep-layer
Akio Shimizu1  Tsuneo Ono1  Tatsuki Toda1  Tomoko Yoshiki1 
关键词: Hydrostatic pressure;    Neocalanus;    Egg hatching success;    Spawning depth;   
DOI  :  10.3354/meps09092
学科分类:海洋学与技术
来源: Inter-Research
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【 摘 要 】

ABSTRACT: We examined the effect of hydrostatic pressure on copepod eggs to test the hypothesis that eggs of calanoid copepods can develop, hatch, and be successfully recruited under the environmental pressure at which they are released. To explore this hypothesis, the pressure tolerance of eggs of the deep-sea-spawning copepods Neocalanus cristatus, N. plumchrus, and N. flemingeri was examined and compared with that of Calanus sinicus, which shows egg hatching success that decreases with increasing pressure. The duration of egg development and the hatching success of Neocalanus copepods were measured at 4°C under hydrostatic pressures of 1, 10, 50, and 100 atm. Neither the egg development time nor hatching success rates were affected by pressure. This implies that eggs of Neocalanus spp. are adapted to a wide pressure range even though reproduction occurs in a high-pressure environment. Both Neocalanus spp. and C. sinicus live over wide depth ranges throughout their lifetimes—from the ocean surface to depths of greater than 1000 m—by undergoing ontogenetic vertical migration. However, during early life stages such as the egg and nauplius stages, C. sinicus is exposed only to a narrow pressure range, from 1 to about 10 atm. In contrast, Neocalanus copepods are exposed to a wide pressure range from deep to surface layers during their early life stages. Therefore, the pressure tolerance of the eggs of calanoid copepods appears to be related to the depth range experienced in the early life stages.

【 授权许可】

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