Effects of population outcrossing on rotifer fitness |
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Authors: | Ana M Tortajada María José Carmona Manuel Serra |
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Institution: | 1.Institut Cavanilles de Biodiversitat i Biologia Evolutiva,Universitat de València,València,Spain |
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Abstract: | Background Outcrossing between populations can exert either positive or negative effects on offspring fitness. Cyclically parthenogenetic
rotifers, like other continental zooplankters, show high genetic differentiation despite their high potential for passive
dispersal. Within this context, the effects of outcrossing may be relevant in modulating gene flow between populations through
selection for or against interpopulation hybrids. Nevertheless, these effects remain practically unexplored in rotifers. Here,
the consequences of outcrossing on the rotifer Brachionus plicatilis were investigated. Cross-mating experiments were performed between a reference population and three alternative populations
that differed in their genetic distance with regard to the former. Two offspring generations were obtained: F1 and BC ('backcross').
Fitness of the outcrossed offspring was compared with fitness of the offspring of the reference population for both generations
and for three different between-population combinations. Four fitness components were measured throughout the rotifer life
cycle: the diapausing egg-hatching proportion, clone viability (for the clones originating from diapausing eggs), initial
net growth rate R for each viable clone, and the proportion of male-producing clones. Additionally, both the parental fertilisation proportion
and a compound fitness measure, integrating the complete life cycle, were estimated. |
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