Resting eggs of the perennial copepod Eodiaptomus japonicus in Lake Biwa (Japan)
Resting eggs of the perennial copepod Eodiaptomus japonicus in Lake Biwa (Japan)
复制标题
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
中科院分区:
文献类型:
--
作者:
Liu Xin;Ban Syuhei;Beyrend Delphine;Dur Gael;Kuwae Michinobu;Makino Wataru;Urabe Jotaro
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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DOI:
--
发表时间:
1995
期刊:
影响因子:
--
作者:
L. M. In;S. K. Rice;P. Schuepp
通讯作者:
P. Schuepp
影响因子:
2.5
作者:
N. Marcus
通讯作者:
N. Marcus
影响因子:
2.1
作者:
E. Castro;John A. Williams
通讯作者:
John A. Williams
DOI:
--
发表时间:
1972
期刊:
影响因子:
--
作者:
S. M. Marshall;A. Orr
通讯作者:
A. Orr
影响因子:
2.8
作者:
B. Santer
通讯作者:
B. Santer