AI Article Synopsis
- Under certain conditions, daphnids primarily reproduce asexually by producing female offspring, but switch to sexual reproduction and male offspring when environmental conditions worsen.
- Most previous research has focused on how male offspring are produced, neglecting to explore how females undergo meiosis for sexual reproduction.
- This study introduces a new method to induce meiosis in female daphnids, revealing that successful mating within a specific timeframe is crucial for the production of meiotic oocytes, while failure to mate leads to the resorption of oocytes, potentially enhancing survival during food shortages.
Article Abstract
Under favorable conditions, daphnids produce only female neonates by parthenogenesis, while they produce male neonates and start sexual reproduction when they detect cues signaling a deteriorating environment. Identifying the regulatory mechanisms of such cyclical parthenogenesis is important for understanding how organisms adapt to environments and expand their habitats. However, most previous studies using the model species and have focused on production of male offspring (sex determination), whereas the process of meiosis induction in females has not been investigated. Here, we report a simple experimental method to induce meiosis effectively in females. Through observations using the new method, we describe the process of sexual reproduction along an individual developmental time course. Meiotic oocytes are oviposited only when females mate within a certain time window, and failure to mate within that window results in subsequent resorption of oocytes, a measure that may increase resistance to starvation. These results further our understanding of regulatory mechanisms and evolutionary processes in the complicated life-history of .
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| http://dx.doi.org/10.2108/zs220010 | DOI Listing |
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