Effect of parental hypoxic exposure on embryonic development of the offspring of two serpulid polychaetes: Implication for transgenerational epigenetic effect |
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| Authors: | JYS Leung SG Cheung JW Qiu PO Ang JMY Chiu V Thiyagarajan PKS Shin |
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| Institution: | 1. Department of Biology and Chemistry, City University of Hong Kong, Hong Kong, China;2. State Key Laboratory in Marine Pollution, City University of Hong Kong, Hong Kong, China;3. Department of Biology, Hong Kong Baptist University, Hong Kong, China;4. School of Life Sciences, Chinese University of Hong Kong, Hong Kong, China;5. School of Biological Sciences, The University of Hong Kong, Hong Kong, China |
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| Abstract: | Sperm production and motility, fecundity, and egg size, complexity and viability of serpulid polychaetes Hydroides elegans and Hydroides diramphus after 2-week treatment to hypoxia (2 mg O2 l−1) was compared with those under normoxia (6 mg O2 l−1). Despite reduced fecundity, the effect of parental hypoxic exposure on gamete quality was not discernible for both species. However, regardless of their subsequent dissolved oxygen environment, eggs spawned by H. elegans after hypoxic exposure were found to have lower fertilization success, slower embryonic development and a significantly higher yield of malformed embryos than those with a parental normoxic treatment. In contrast, neither fertilization success nor rate of embryonic development was affected for H. diramphus. The results implied that hypoxia was a potential stress reducing the recruitment of H. elegans through non-adaptive epigenetic effect, whereas H. diramphus was a more tolerant species to survive hypoxic events. |
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| Keywords: | Hypoxia Serpulid polychaetes Gametes Fertilization success Embryonic development Epigenetic effect |
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