Resting eggs of the perennial copepod Eodiaptomus japonicus in Lake Biwa (Japan)

Resting eggs of the perennial copepod Eodiaptomus japonicus in Lake Biwa (Japan)
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琵琶湖(日本)多年生桡足类 Eodiaptomus japonicus 的休眠卵

DOI:
10.1080/20442041.2019.1671766
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发表时间:
2020
期刊:
影响因子:
3.1
通讯作者:
Urabe Jotaro
Urabe Jotaro
中科院分区:
环境科学与生态学3区
文献类型:
--
作者:
Liu Xin;Ban Syuhei;Beyrend Delphine;Dur Gael;Kuwae Michinobu;Makino Wataru;Urabe Jotaro

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卵休眠是桡足类生活史上的一个重要策略,它可以暂时逃避灾难性或重复性的有害事件,并确保永久定居。在琵琶湖,虽然桡足类Eodiaptomus japonicus全年占主导地位的浮游动物群落,它已被称为生产休眠蛋,但很少有人知道它的休眠。阐明了E.因此,我们收集了一个沉积物芯从琵琶湖,分离休眠卵,并进行孵化实验,以确定孵化的个体的生活史特征。我们从17厘米深的沉积物中分离出242枚卵(最大年龄为60年),虽然没有发现严格的灾难性事件,如季节性干涸,但研究结果表明,E. 日本人可能有一个“对冲”策略。17 cm以上的累积卵密度为2.5 × 104 m −2,年平均卵通量为103 m − 2/年。 在前10厘米的沉积物中,平均卵孵化成功率为17%。 在10厘米深以下没有卵孵化。 休眠卵的胚胎发育时间长于subitaneous卵,表明存在一个滞后期,直到发展恢复; 33%的孵化无节幼体蜕皮到成年,和80%的女性产生后代。这些结果表明,潜在的招聘从休眠卵在底部沉积物中,部分作为一个卵银行在这桡足类。
Egg dormancy is a key life history strategy in copepods to temporarily escape catastrophic or repetitive detrimental events and ensure permanent colonization. In Lake Biwa, although the copepodEodiaptomus japonicusdominates the zooplankton community year-round, it has been known to produce resting eggs, yet little is known about its dormancy. To clarify the nature of dormancy inE. japonicus, we collected a sediment core from Lake Biwa, isolated resting eggs, and conducted hatching experiments to determine the life-cycle traits of the hatched individuals. We isolated 242 eggs (maximum age, 60 years) from the upper 17 cm depth sediments, and although no strict catastrophic event such as seasonal drying up was found, the findings implied thatE. japonicusmight have a “bet-hedging” strategy. Accumulated egg density above 17 cm was 2.5 × 104m−2, and mean annual egg flux was 103m−2per year. Over the first 10 cm sediments, average egg hatching success was 17%. No egg hatchings were confirmed below 10 cm depth. Embryonic development times of the resting eggs were longer than those of subitaneous eggs, indicating that a lag phase existed until development resumed; 33% of hatched nauplii molted to adulthood, and 80% of females produced offspring. These results suggest potential recruitment from resting eggs in the bottom sediments, which partly serve as an egg bank in this copepod.
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