The Role of Propagule Pressure, Genetic Diversity and Microsite Availability for Senecio vernalis Invasion

Erfmeier, Alexandra; Hantsch, Lydia; Bruelheide, Helge
February 2013
PLoS ONE;Feb2013, Vol. 8 Issue 2, p1
Academic Journal
Genetic diversity is supposed to support the colonization success of expanding species, in particular in situations where microsite availability is constrained. Addressing the role of genetic diversity in plant invasion experimentally requires its manipulation independent of propagule pressure. To assess the relative importance of these components for the invasion of Senecio vernalis, we created propagule mixtures of four levels of genotype diversity by combining seeds across remote populations, across proximate populations, within single populations and within seed families. In a first container experiment with constant Festuca rupicola density as matrix, genotype diversity was crossed with three levels of seed density. In a second experiment, we tested for effects of establishment limitation and genotype diversity by manipulating Festuca densities. Increasing genetic diversity had no effects on abundance and biomass of S. vernalis but positively affected the proportion of large individuals to small individuals. Mixtures composed from proximate populations had a significantly higher proportion of large individuals than mixtures composed from within seed families only. High propagule pressure increased emergence and establishment of S. vernalis but had no effect on individual growth performance. Establishment was favoured in containers with Festuca, but performance of surviving seedlings was higher in open soil treatments. For S. vernalis invasion, we found a shift in driving factors from density dependence to effects of genetic diversity across life stages. While initial abundance was mostly linked to the amount of seed input, genetic diversity, in contrast, affected later stages of colonization probably via sampling effects and seemed to contribute to filtering the genotypes that finally grew up. In consequence, when disentangling the mechanistic relationships of genetic diversity, seed density and microsite limitation in colonization of invasive plants, a clear differentiation between initial emergence and subsequent survival to juvenile and adult stages is required.


Related Articles

  • Genetic diversity and population structure of the mistletoe Tristerix corymbosus (Loranthaceae). Amico, Guillermo; Vidal-Russell, Romina; Aizen, Marcelo; Nickrent, Daniel // Plant Systematics & Evolution;Jan2014, Vol. 300 Issue 1, p153 

    The genetic structure of a plant species is influenced by life-history traits, geographical range and ecological interactions that shape gene flow. We examined the genetic structure of the South American mistletoe Tristerix corymbosus using random amplification of polymorphic DNA. This species...

  • Echeandia novogaliciana and E. crudeniana (Anthericaceae): Two new species from western Mexico. Rodríguez, Aarón; Ortiz-Catedral, Luis // Brittonia;Sep2013, Vol. 65 Issue 3, p345 

    Echeandia novogaliciana and E. crudeniana are described from western Mexico. Echeandia novogaliciana is known from three populations, one in the state of Nayarit and two in Zacatecas. Likewise, E. crudeniana is known from two populations in the municipality of Bahía de Banderas, Nayarit. For...

  • Genetic diversity of pioneer populations: the case of Nassauvia argentea (Asteraceae: Mutisieae) on Volcán Lonquimay, Chile. Green, Emily; Tremetsberger, Karin; Jiménez, Alejandra; Gómez-González, Susana; Stuessy, Tod; Baeza, Carlos; López, Patricio // Plant Systematics & Evolution;Jan2012, Vol. 298 Issue 1, p109 

    Colonising populations do not always exhibit founder effects. Common explanations are high levels of immigration and/or reproduction, but few empirical tests have been done. We measured genetic diversity of Nassauvia argentea in terms of variation and divergence of plant populations that have...

  • Morphological variation, genetic diversity and genome size of critically endangered Haberlea (Gesneriaceae) populations in Bulgaria do not support the recognition of two different species. Petrova, Galya; Dzhambazova, Teodora; Moyankova, Daniela; Georgieva, Desislava; Michova, Antoaneta; Djilianov, Dimitar; Möller, Michael // Plant Systematics & Evolution;Jan2014, Vol. 300 Issue 1, p29 

    Haberlea is one of the few Gesneriaceae genera that has entered Europe. It is a highly endangered genus and red-listed in Bulgaria. Two species, H. rhodopensis and H. ferdinandi- coburgii, have been described to occur in Bulgaria, but this has never been addressed systematically. Here, we used...

  • Patterns of allozyme diversity in several selected rare species in Korea and implications for conservation.  // Biodiversity & Conservation;Mar2003, Vol. 12 Issue 3, p529 

    Presents an analysis of population genetic structure to fully evaluate the impact of rarity on genetic variation in the case of some endemic plants that appear to be adapted to a narrow set of environmental conditions with limited genetic diversity. Listed as endangered species in Korea, only...

  • Population structure and genetic diversity of Prunus scoparia in Iran. Mehdigholi, Kazem; Sheidai, Masoud; Niknam, Vahid; Attar, Farideh; Noormohammadi, Zahra // Annales Botanici Fennici;Oct2013, Vol. 50 Issue 5, p327 

    Over 30 Prunus species and taxa below the rank of species are known from Iran. These wild taxa provide an enlarged gene pool and may be considered a valuable germ-plasm source for breeding cultivated almonds. The present study is a genetic diversity analysis of six P. scoparia populations using...

  • Genetic variability and divergence among Italian populations of common ash (Fraxinus excelsior L.). Diana Ferrazzini; Ignazio Monteleone; Piero Belletti // Annals of Forest Science (EDP Sciences);Mar2007, Vol. 64 Issue 2, p159 

    The level of genetic variation throughout the Italian range of common ash (Fraxinus excelsior L.) was estimated using six microsatellite markers. High levels of allelic diversity was detected. The levels of expected heterozygosity for each of the populations ranged from 0.726 to 0.871, with an...

  • Old-Growth Platycladus orientalis as a Resource for Reproductive Capacity and Genetic Diversity. Zhu, Lin; Lou, Anru // PLoS ONE;Feb2013, Vol. 8 Issue 2, p1 

    Aims: Platycladus orientalis (Cupressaceae) is an old-growth tree species which distributed in the imperial parks and ancient temples in Beijing, China. We aim to (1) examine the genetic diversity and reproductive traits of old-growth and young populations of P. orientalis to ascertain whether...

  • An experimental study of the S-Allee effect in the self-incompatible plant Biscutella neustriaca. Leducq, Jean-Baptiste; Gosset, Célia Chantal; Poiret, Matthieu; Hendoux, Frédéric; Vekemans, Xavier; Billiard, Sylvain // Conservation Genetics;Apr2010, Vol. 11 Issue 2, p497 

    Homomorphic self-incompatibility (SI) evolved in many plant families to enforce selfing avoidance, and is controlled by a single multiallelic locus (the S-locus). In a fragmented landscape, strong variation in population size and in local density is expected to cause strong variation in allelic...


Read the Article


Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics