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- W2364373566 abstract "Larval development was observed and morphological characteristics at each developmental period were described in complete inter-specific,diallel cross and corresponding reciprocal cross in sea urchins Strongylocentrotus intermedius(Si) and S. nudus(Sn)(Si♀ × Si♂,Sn♀ × Sn♂,Si♀ × Sn♂,Sn♀ × Si♂). The rates of fertilization,hatching,and deformity and growth at each period were monitored in the offsprings from the self propagation and hybridization exposed to 18,22,26,and 30 ℃. The results showed that there was significantly lower fertilization rate in inter-specific hybrids than intra-specific offsprings(P 0. 05) without significant difference in hatching rate between intra-specific offsprings and inter-specific offsprings at 18 ℃(P 0. 05). Larval hybrids blended morphological traits of both species. The fertilization rate and hatching rate were found to be significantly affected by temperature(P 0. 05),the maximum fertilization rate and hatching rate in S. intermedius at 22 ℃and the optimal temperature of 18 ℃ for S. nudus. In heterogeneous Si♀ × Sn♂,however,the maximal fertilization rate was observed at 22 ℃ and the maximal hatching rate at 18 ℃. During the larval development period,temperature showed significantly effect on the deformity rate and growth of the sea urchins( P 0. 05),the optimal temperature of 18 ℃ for all sea urchin larvae. The minimal deformity and the least growth were found in echinopluterus with four-arms in Si♀ × Sn♂,and the mid-deformity rate and growth were observed in the echinopluterus with six and eight arms between inter-specific cross groups,the maximal deformity in the echinopluterus with eight arms. Due to the maternal effects,the Si♀ × Sn♂ offsprings were able to tolerant high temperature in the early embryonic development stages,but showed poor growth along with development period owing to gradual decrease in the maternal effects. The paternal heterosis was gradually reflected in growth." @default.
- W2364373566 created "2016-06-24" @default.
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- W2364373566 date "2014-01-01" @default.
- W2364373566 modified "2023-09-24" @default.
- W2364373566 title "Development and heat responses of larvae self propagated and hybridized from sea urchins Strongylocentrotus intermedius and S. nudus" @default.
- W2364373566 hasPublicationYear "2014" @default.
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