The effect of lake sediment on the hatching success of Daphnia ephippial eggs

Radzikowski, Jacek; Sikora, Anna; Ślusarczyk, Mirosław

doi:10.4081/jlimnol.2016.1345

Cited by 3 publications

(2 citation statements)

References 47 publications

(77 reference statements)

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“…Due to the semi-permanent nature of our study pond, it would be advantageous for some Daphnia to emerge spontaneously, either as a response to better make use of a mild off-season or because they may not receive the correct cue to terminate dormancy. If individuals do not hatch out for a period of time, there is also the risk of being buried in sediment, which drastically decreases the rate of ephippial hatching (Radzikowski et al, 2016). As individuals produced are also sexually recombinant, early hatchers may add necessary genetic diversity to a mostly clonal population late in the season in permanent ponds.…”

Section: Discussionmentioning

confidence: 99%

Maternal control of spontaneous dormancy termination inDaphnia pulex

Porter

Gutierrez

Barnard‐Kubow

et al. 2022

Preprint

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This study examined maternal influence and life-history consequences of diapause termination timing in Daphnia pulex. We raised clonal isolates of D. pulex in mesocosms and observed hatching rates prior to and after exposing embryos to a cold shock. A substantial proportion of individuals hatched early, prior to the cold shock. We found that siblings from the same ephippium were more likely than expected by chance to emerge at the same time, even after dissection and separation, suggesting the presence of a maternal effect that influences diapause duration. We also found that for individuals who emerged early, the time to first reproduction was significantly delayed, and individuals produced fewer resting embryos in subsequent generations. We suggest that early diapause termination may be driven by maternal effects to generate offspring that emerge from dormancy at different times.

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Section: Discussionmentioning

confidence: 99%

Maternal control of spontaneous dormancy termination inDaphnia pulex

Porter

Gutierrez

Barnard‐Kubow

et al. 2022

Preprint

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“…Even a thin sediment layer may form a barrier for exephippial embryos. Ephippia that remain at the sediment surface have a higher chance to terminate diapause when favorable conditions return to the water column than ones buried in sediments (Radzikowski et al ). Large quantities of ephippia may reside endlessly in lake sediments unless some external power (burrowing animals, gas bubbles, etc.)…”

Section: Discussionmentioning

confidence: 99%

Light quantity, not photoperiod terminates diapause in the crustacean Daphnia

Ślusarczyk

Flis

2018

Limnology & Oceanography

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While light controls dormancy occurrence in various groups of organisms, it may play different roles in its initiation and termination. Seasonally changing photoperiod is frequently used to announce cyclical events and trigger diapause initiation in advance of seasonal changes. A similar role for photoperiod has often been uncritically extended to diapause termination. In the present study we investigated the role of photoperiod and light quantity in diapause termination of resting eggs of a freshwater crustacean. In a few tests, a cohort of resting eggs of Daphnia magna were incubated under various light conditions. A short‐day photoperiod appeared as successful as a long day or artificial one in reactivating resting eggs. The hatching proportion was more related to total light energy applied than to its temporal pattern. The hatching proportion increased asymptotically from 0% reported after 6 h of light exposition or shorter, to 32% after 48 h of total light period of moderate intensity (55 μmol m−2 s−1). Longer light exposition did not increase hatching success considerably. A 15 times lower light intensity (3.5 vs. 55 μmol m−2 s−1) applied for a given period of time (96 h) resulted in a 3 times lower hatching success. Our results challenge the common opinion of the decisive role of photoperiod in diapause termination and support the alternative light‐energy threshold hypothesis. It seems that the resting eggs of D. magna do not monitor seasonal changes of the photoperiod but reactivate after completion of the refractory period and accumulation of a certain amount of light energy dose.

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