Data from: Selfing ability and dispersal are positively related, but not affected by range position, across multiple species of southern African Asteraceae
de Waal, Caroli, Stellenbosch University
Rodger, James G., Stellenbosch University
Anderson, B., Stellenbosch University
Ellis, Allan G., Stellenbosch University
Published Mar 12, 2014 on Dryad.
Cite this dataset
de Waal, Caroli; Rodger, James G.; Anderson, B.; Ellis, Allan G. (2014). Data from: Selfing ability and dispersal are positively related, but not affected by range position, across multiple species of southern African Asteraceae [Dataset]. Dryad. https://doi.org/10.5061/dryad.fp023
Dispersal and breeding system traits are thought to affect colonization success. As species have attained their present distribution ranges through colonization, these traits may vary geographically. Although several theories predict associations between dispersal ability, selfing ability and the relative position of a population within its geographic range, there is little theoretical or empirical consensus on exactly how these three variables are related. We investigated relationships between dispersal ability, selfing ability and range position across 28 populations of 13 annual, wind-dispersed Asteraceae species from the Namaqualand region of South Africa. Controlling for phylogeny, relative dispersal ability – assessed from vertical fall time of fruits – was positively related to an index of autofertility – determined from hand-pollination experiments. These findings support the existence of two discrete syndromes: high selfing ability associated with good dispersal and obligate outcrossing associated with lower dispersal ability. This is consistent with the hypothesis that selection for colonization success drives the evolution of an association between these traits. However, no general effect of range position on dispersal or breeding system traits was evident. This suggests selection on both breeding system and dispersal traits acts consistently across distribution ranges.
Namaqualand annual Asteraceae fruit set and fruit fall-times
This file contains fruit set for hand pollination experiments and fall times for achenes, including sample size and standard deviation