File:Daphnia Ephippia.jpg
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Summary
DescriptionDaphnia Ephippia.jpg |
Eesti: Fotol on näha kiivrik perekonda kuuluva vesikirbu püsimuna. Püsimunad on munad mis tekkivad kui veekogus elutingimused halvenevad, nt tuleb talv. Kirbud moodustavad püsimunad ja need lastakse veekogu põhja, need võivad seal olla aastakümneid või isegi aastasadu, kui elutingimused paranevad, tõusevad munad pinnale ja nendest kooruvad uued kirbud.
English: Ephippia (singular: ephippium) are winter or dry-season eggs of the various species of small crustacean in the order Cladocera (within the Branchiopoda); they are provided with an extra shell layer, which preserves and protects the resting stages inside from harsh environmental conditions until the more favorable times, such as spring, when the reproductive cycle is able to take place once again. Ephippia are part of the back of a mother carrying them until they are fully developed. After molting, the ephippium stays in the water, or in the soil of dried puddles, small ponds, and vernal pools. The resting stages are often called eggs, but are in fact embryos with arrested development. Ephippia can rest for many years before the embryo resumes development upon an appropriate hatching stimulus. |
Date | |
Source | Own work |
Author | Janek Lass |
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This file was uploaded as part of Wiki Science Competition 2023. |
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7,762,792 byte
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19 April 2023
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Date/Time | Thumbnail | Dimensions | User | Comment | |
---|---|---|---|---|---|
current | 06:07, 19 November 2023 | 5,160 × 3,434 (7.4 MB) | Janeklass | Uploaded own work with UploadWizard |
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Date and time of data generation | 19:15, 19 April 2023 |
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File change date and time | 19:34, 19 April 2023 |
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Date metadata was last modified | 22:34, 19 April 2023 |
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