Diapause Induction in
            <i>Daphnia</i>
            Requires Two Stimuli

Stross, R. G.; Hill, Jeanne C.

doi:10.1126/science.150.3702.1462

Cited by 190 publications

(110 citation statements)

References 13 publications

(2 reference statements)

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“…Under favorable environmental conditions, female daphnids produce diploid eggs that develop without fertilization. When stimulated by food deprivation or other environmental cues, the daphnids produce males and haploid eggs that must be fertilized to develop (14,15). The endogenous factors that regulate male production are not known; however, we have never observed the production of male offspring in response to testosterone exposure.…”

Section: Discussionmentioning

confidence: 83%

Embryotoxicity of the Alkylphenol Degradation Product 4-Nonylphenol to the Crustacean Daphnia magna

LeBlanc¹,

Mu²,

Rider³

2000

Environmental Health Perspectives

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Section: Discussionmentioning

confidence: 83%

Embryotoxicity of the Alkylphenol Degradation Product 4-Nonylphenol to the Crustacean Daphnia magna

LeBlanc¹,

Mu²,

Rider³

2000

Environmental Health Perspectives

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“…Yet, these differences in conditions reflect the natural situation, and hence, are part of the background selective environment against which differences in egg type composition evolved. Given that only suboptimal conditions trigger the formation of resting eggs (Stross & Hill, 1965), it would be artificial to compare both egg types in females that experienced identical, near optimal conditions. First, the multi-generational mixture of dormant eggs is expected to generate a larger interegg variability in biochemical content in dormant eggs.…”

Section: Discussionmentioning

confidence: 99%

Biochemical adaptation for dormancy in subitaneous and dormant eggs of Daphnia magna

et al. 2007

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Daphnia can reproduce through subitaneous and dormant eggs. The production of dormant eggs is induced by stimuli associated with deteriorating growth conditions, and enable Daphnia populations to survive temporarily harsh environmental conditions. Dormant eggs are expected to have developed special biochemical adaptations to bridge this long unfavourable period, but little comparative biochemical data are available for dormant and subitaneous eggs. We compared levels of the following molecules between subitaneous and dormant eggs: (a) triglycerides, which are the most abundant energy storage molecules in Daphnia, (b) glycerol, a cryoprotectant also involved in energy storage, and (c) the heat shock protein Hsp60, a molecular chaperone that may assist in maintaining protein structural integrity and inhibiting cell metabolism during diapause. Unexpectedly, no difference in triglycerides content between egg types was found. As expected, dormant eggs contained more glycerol and relatively more Hsp60 than subitaneous eggs. The biochemical composition of dormant eggs can therefore be seen as an adaptation to the harsh environmental conditions these eggs encounter.

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“…Water from separate, high-density cultures was used to provide a crowding cue to the females to induce ephippial production (Stross & Hill 1965). Any live young or males were removed from the beakers, and all ephippia produced were collected, opened and scored for the presence of eggs.…”

Section: Methodsmentioning

confidence: 99%

DNA transposon dynamics in populations ofDaphnia pulexwith and without sex

et al. 2010

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We investigate the role of recombination in transposable element (TE) proliferation in the cyclical parthenogen, Daphnia pulex. Recombination provides a mechanism by which the rate of both TE gain and loss can be accelerated, a duality that has long intrigued many biologists interested in the influence of sex on mutation accumulation. We compared TE loads among populations of D. pulex where sex occurs regularly (cyclical parthenogens or 'sexuals') with those in which the ability to reproduce sexually has been completely lost (obligate 'asexuals') for six different families of DNA transposons. Transposon display assays showed that sexuals have more TEs than asexuals, contrary to the expectations under Muller's ratchet but consistent with the idea that sex facilitates TE spread. Sexuals also exhibit higher insertion site polymorphism among lineages, as predicted because recombination accelerates rates of loss and gain. Asexuals, however, have proportionally more singletons (loci occupied in a single isolate), which differs from previous studies where selfing and outcrossing were used as a proxy for high and low recombination. Our multi-element survey reveals that the impact of sex on TE proliferation is consistent among different Class II TE families and we discuss the genomic consequences of different reproductive strategies over long time periods.

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Diapause Induction in Daphnia Requires Two Stimuli

Cited by 190 publications

References 13 publications

Embryotoxicity of the Alkylphenol Degradation Product 4-Nonylphenol to the Crustacean Daphnia magna

Embryotoxicity of the Alkylphenol Degradation Product 4-Nonylphenol to the Crustacean Daphnia magna

Biochemical adaptation for dormancy in subitaneous and dormant eggs of Daphnia magna

DNA transposon dynamics in populations ofDaphnia pulexwith and without sex

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