Off spring of aged mothers of rotifer Brachionus calycifl orus shows lower sexual propensity than their elder siblings under crowded conditions
- 23 Downloads
Maternal eff ects are one of the most interesting topics in evolutionary ecology as they can aff ect the rate of evolution and population dynamics by phenotypic manipulation of off spring related to fi tness. At present, studies examining the interaction between maternal environment eff ects and maternal age (birth order) eff ects are scarce. We designed an experiment to reveal whether environmentally induced maternal manipulation works equally on off spring across birth orders in rotifer Brachionus calyciflorus. In the experiment, newborn amictic mothers (F0 ) were cultured parallelly in low (LD) and high (HD) population density. Off spring (F1 ) of young (YF0 ) and old mothers (OF0 ) in both LD and HD groups were cultured under a crowded condition and the mixis ratios of both F 1 and F 2 were examined. Results show that F1 from HD-YF0 had a signifi cantly higher mixis ratio and those amictic ones produced daughters (F2 ) with higher mixis ratio in response to crowding than those from HD-OF0. In contrast, no such diff erences among F1 siblings were found in the LD-F 0 group. Therefore, the eff ect of maternal age on the sexual propensity of the off spring can be aff ected independently by the maternal population density.
Key wordrotifer Brachionus calyciflorus sexual propensity birth order eff ect maternal environment mixis ratio
Unable to display preview. Download preview PDF.
- Bernardo J. 1996. The particular maternal effect of propagule size, especially egg size: patterns, models, quality of evidence and interpretations. Integr. Comp. Biol., 36 (2): 216–236, https://doi.org/10.1093/icb/36.2.216.Google Scholar
- FACHB–2016 (Freshwater Algae Culture Collection of the Institute of Hydrobiology). 2016. SE (Brostol’s solution) medium. http://algae.ihb.ac.cn/Products/ProductDetail. aspx?product=3.Google Scholar
- Gilbert J J. 2007. Induction of mictic females in the rotifer Brachionus: oocytes of amictic females respond individually to population–density signal only during oogenesis shortly before oviposition. Freshw. Biol., 52 (8): 1 417–1 426, https://doi.org/10.1111/j.1365–2427.2007.01782.x.CrossRefGoogle Scholar
- Lints F A, Hoste C. 1977. The Lansing effect revisited. II—Cumulative and spontaneously reversible parental age effects on fecundity in Drosophila melanogaster. Evolution, 31 (2): 387–404, https://doi.org/10.1111/j.1558–5646.1977. tb01020.x.Google Scholar
- Serra M, Snell T W, King C E. 2004. The timing of sex in cyclically parthenogenetic rotifers. In: Moya A, Font E eds. Evolution: From Molecules to Ecosystems. Oxford University Press, Oxford. p.135–146.Google Scholar