DOI: 10.5061/dryad.1jp26
title: Data from: Role of propagule pressure in colonization success: disentangling the relative importance of demographic, genetic and habitat effects

description: High propagule pressure is arguably the only consistent predictor of
 colonization success. More individuals enhance colonization success
 because they aid in overcoming demographic consequences of small
 population size (e.g. stochasticity and Allee effects). The number of
 founders can also have direct genetic effects: with fewer individuals,
 more inbreeding and thus inbreeding depression will occur, whereas more
 individuals typically harbour greater genetic variation. Thus, the
 demographic and genetic components of propagule pressure are interrelated,
 making it difficult to understand which mechanisms are most important in
 determining colonization success. We experimentally disentangled the
 demographic and genetic components of propagule pressure by manipulating
 the number of founders (fewer or more), and genetic background (inbred or
 outbred) of individuals released in a series of three complementary
 experiments. We used Bemisia whiteflies and released them onto either
 their natal host (benign) or a novel host (challenging). Our experiments
 revealed that having more founding individuals and those individuals being
 outbred both increased the number of adults produced, but that only
 genetic background consistently shaped net reproductive rate of
 experimental populations. Environment was also important and interacted
 with propagule size to determine the number of adults produced. Quality of
 the environment interacted also with genetic background to determine
 establishment success, with a more pronounced effect of inbreeding
 depression in harsh environments. This interaction did not hold for the
 net reproductive rate. These data show that the positive effect of
 propagule pressure on founding success can be driven as much by underlying
 genetic processes as by demographics. Genetic effects can be immediate and
 have sizable effects on fitness.
description: Hufbauer_etal_bemisia_manip1These are the data from the first experiment described in the paper, with one host plant (cabbage), and a factorial manipulation of founding population size and genetic background. Data were in excel, and I saved them as a comma delimited file. Column headings are: breeding (inbred or outbred), size (4 or 20), found (number of Bemisia removed after the oviposition period), success (0, 1: did the founders reproduce?), adults (# of adults found), fem (number of females found), propfem (proportion of females), rootadults (square root of the number of adults + 1), R (the net reproductive rate: number of adults found/number put in initially), rootR (the square root of R+1)Hufbauer_etal_bemisia_manip2These data correspond to the second experiment described in the paper - fully factorial with host plant, genetic background, and founding population size. Column headings are: number (identifier of the experimental unit), size (16 or 4), plant (tobacco or cabbage), breeding (inbred or outbred), success_larvae (were larvae produced, 1 or 0), success_adults (were adults produced, 1 or 0), larvae (number of), growthratelarv (larvae/size), adults (numbers of adults), R (adults/size, the net reproductive rate), devtime (development time in days), larval survival (proportion of larvae that reached adulthood), presence of females (1, 0)Hufbauer_etal_bemisia_manip3These data correspond to the third experiment described in the paper - fully factorial with host plant and founding population size. Column headings are: number (identifier of the experimental unit), plant (tobacco or cabbage), size (grande ou petite), size (16 or 4), date, success_larvae (were larvae produced, 1 or 0), success_adults (were adults produced, 1 or 0), larvae (number of), adults (numbers of adults), growthratelarv (larvae/size), growthrateadults (adults/size, the net reproductive rate R), larvsurv (proportion of larvae that reached adulthood), sex ration (proportion females), presence of females (1, 0)