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The critical stage for inducing oviparity and embryonic diapause in parthenogenetic Artemia(Crustacea: Anostraca): an experimental study

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Journal of Oceanology and Limnology 2019年第5期37卷 1669-1677页

作者： WANG Zhichao Alireza ASEM robert k. okazaki SUN Shichun Institute of Evolution & Marine Biodiversity Ocean University of ChinaQingdao 266003China College of Life Science Tarim UniversityAlar 843300China School of Life Science and Ecology Hainan Tropical Ocean UniversitySanya 572022China Department of Zoology Weber State University1415 Edvalson StreetDept 2505OgdenUT 84408-2505USA

The brine shrimp Artemia exhibits two reproductive modes: 1) oviparity, producing diapause embryos;and 2) ovoviviparity, producing free-swimming nauplii. Previous studies have suggested the existence of a critical stage that determines the reproductive mode. Physicochemical factors, such as photoperiod, temperature, and salinity, have been suggested to irreversibly aff ect the reproductive mode of oocytes during this critical stage. In this study, experiments were carried out using a photoperiod and temperature-sensitive parthenogenetic Artemia clone where maternal Artemia were shifted bidirectionally between ovoviviparity (18 h L:6 h D, 27℃) and oviparity (6 h L:18 h D, 19℃) culture conditions. In the main experiment ( Artemia shifted at six diff erent stages including the post-larva Ⅱ to adult Ⅱ), the reproductive mode of fi rst brood was converted when shifting was performed on post-larva Ⅱ and Ⅲ but was not converted when females were shifted after post-larva Ⅲ. A supplementary experiment further revealed that the reproductive mode of fi rst brood could be altered when shifting females at an "early phase of postlarva Ⅳ", characterized by a developing ovisac reaching the middle of the third abdominal segment, ventral spines, and some oocytes growing larger than the others. In both experiments, reproductive modes of the second brood were signifi cantly aff ected when the shifting was performed on post-larva Ⅳ. These results suggest that the critical stage for inducing oviparity and embryonic diapause is at the previtellogenic stage of oocytes, or at maternal "early phase of post-larva Ⅳ" for the first-brood off spring. During this stage, diff erential gene expression patterns of the two destined oocytes may be triggered by the tok.n stimuli signals received by the oocytes.

关键词： Artemia reproduction mode environmental factors diapause critical stage Anostraca

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热应激Oreohelix蜗牛的热应激蛋白和水的变化

热应激Oreohelix蜗牛的热应激蛋白和水的变化

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中国生理学会第五届比较生理学学术会议

作者：叶文博 robert k.okazaki Nicole J.Berthelemy-okazaki 上海师范大学生命与环境科学学院 Department of Zoology Weber State University Ogden UT 84408-2505 USA Department of Zoology Weber State University Ogden UT 84408-2505 USA

＜正＞在犹他州,山地蜗牛Oreohelix peripherica wasatchensis是濒危物种,它生活在落矶山脉西坡Wasatch高地的狭小范围内。另一种同属蜗牛Oreohelix strigosa则广泛分布于落矶山脉之中。它们在夏季经历高温干旱。本研究是调查在近似致...

＜正＞在犹他州,山地蜗牛Oreohelix peripherica wasatchensis是濒危物种,它生活在落矶山脉西坡Wasatch高地的狭小范围内。另一种同属蜗牛Oreohelix strigosa则广泛分布于落矶山脉之中。它们在夏季经历高温干旱。本研究是调查在近似致死温度条件下*** and ***热应激蛋白的表达和水量的变化以及壳的形态结构。

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