Polymorphism in stem females and successive parthenogenetic generations in Brachionus calyciflorus Pallas |
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Authors: | Xu Wang Yin Cui Juan Niu |
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Institution: | (1) MOE Key Laboratory for Biodiversity Science and Ecological Engineering, College of Life Sciences, Beijing Normal University, Beijing, 100875, P. R. China |
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Abstract: | We have described the polymorphism in the hatchlings of resting eggs and the morphological variations between the stem females
hatched from resting eggs and their successive parthenogenetic generations in the rotifer Brachionus calyciflorus. We hatched resting eggs of B. calyciflorus in two different culture mediums: unconditioned medium (IOM) and Asplanchna-conditioned (ACM). The hatching rate of resting eggs in IOM and ACM were 32.5% and 28.5%, respectively, and showed no significant difference. Stem females hatching from these resting eggs
had three morphotypes (unspined, single short-spined, and two short-spined) and over 80% of these females were spineless ones.
Moreover, the frequency of each morphotype stem females showed similar tendency in IOM and ACM. The production of a variety of morphotypes among stem mothers—rather than all unspined as has been previously reported
for this species—may be regarded as a form of bet-hedging in this population of B. calyciflorus. Phenotypic changes in morphology between the stem females hatched from resting eggs and their successive parthenogenetic
generations in B. calyciflorus were found. The possible mechanisms, responsible for high proportion of spineless phenotype at early generations from resting
eggs and increased spined phenotype in successive parthenogenetic generations, were discussed in the article. |
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Keywords: | Rotifer Resting egg Stem females Morphotype Parthenogenetic generations Spine |
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