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A Comparative Study on the Buoyancy of Resting Eggs from Different Artemia Populations, with Emphasis on Its Relationships with Habitat Salinity and Biometric Characters of Resting Eggs

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Journal of Ocean University of China 2022年第6期21卷 1585-1596页

作者： ZHOU Jiaxuan HUANG Zhike GUO Yan SUN Shichun The Key Laboratory of Mariculture(Ministry of Education) and Institute of Evolution&Marine BiodiversityOcean University of ChinaQingdao 266003China Xinjiang Uygur Autonomous Region Fisheries Research Institute Urumqi 830002China

The buoyancy of Artemia resting eggs is a feature with both biological and economic *** the buoyancy of resting eggs is dependent on the specific weight of the eggs or salinity of ambient water,we suppose that habitat salinity may exert a selection pressure on resting egg buoyancy,and thereby lower habitat salinity may result in better floating capacity of resting eggs and vice *** this study,we compared the floating capacity of resting eggs from 25 Artemia *** results showed that the floating capacity of resting eggs varied greatly among different *** minimum salinity to float some eggs varied from 0 to *** salinity at which all resting eggs floated varied from 80 to *** FS_(50)(salinity with 50%eggs floating)of Zhundong and Yuncheng population was not detectable(over 50%eggs floating in distilled water),that of Kyêbxang Co population was 4.3,while the maximum value found in Dabancheng population was *** terms of the‘apparent specific weight’of resting eggs,18 populations exhibited a single-peak distribution pattern,while the other 7 populations showed a multiple-peak or non-peak *** correlations were found between FS50 and chorion thickness,and between FS_(50) and the volume percentage of the chorion in eggs,supporting a previous standpoint that shell thickness was a determinative factor for the floating capacity of resting eggs.A positive correlation was determined between FS50 and habitat *** hypothesis that habitat salinity may cause a directional selection on the buoyancy of resting eggs seems to be true.

关键词： brine shrimp cyst floating capacity shell thickness

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