2026-05-28T00:36:41Zhttps://riuma.uma.es/rest/oai/request

oai:riuma.uma.es:10630/340922026-02-03T10:50:11Zcom_10630_2254col_10630_37953

00925njm 22002777a 4500 dc Manrique-Poyato, María Inmaculada author Muñoz-Pajares, Antonio Jesús author Loreto, Vilma author López-León, María Dolores author Cabrero-Hurtado, Josefa author Martínez-Camacho, Juan Pedro author 2006 We have analysed B chromosome frequency for three consecutive years, B transmission rate at population and individual levels, clutch size, egg fertility and embryoYadult viability in a natural population of the grasshopper Eyprepocnemis plorans containing two different B chromosome variants, i.e. B2 and B24, the second being derived from the first and having replaced it in nearby populations. From 2002 to 2003 the relative frequency of both variants changed, although the differences did not reach significance. A motherYoffspring analysis showed no significant effect of any of the two B variants on clutch size, egg fertility or embryoYadult viability, but B24 was more efficiently transmitted than B2 through males from the 2002 season, which explains the observed frequency change. Controlled crosses, at individual level, showed significant drive through some females for B24 but not for B2, suggesting that this difference in transmission rate might also be important for the substitution process. The analysis of relative fitness for B2 and B24 carriers for all fitness components, as a whole, showed a significantly better performance of B24-carrying individuals, suggesting that the cumulative effect of these slight differences might contribute to the replacement of B2 by B24. Manrique-Poyato, M.I., Muñoz-Pajares, A.J., Loreto, V. et al. Causes of B chromosome variant substitution in the grasshopper Eyprepocnemis plorans . Chromosome Res 14, 693–700 (2006). https://doi.org/10.1007/s10577-006-1081-2 https://hdl.handle.net/10630/34092 10.1007/s10577-006-1081-2 Cromosomas Causes of B chromosome variant substitution in the grasshopper Eyprepocnemis plorans