9 Works

Data from: Dispersal propensity in Tetrahymena thermophila ciliates – a reaction norm perspective

Frank Pennekamp, Katherine A. Mitchell, Alexis Serge Chaine, Nicolas Schtickzelle & Alexis Chaine
Dispersal and phenotypic plasticity are two main ways for species to deal with rapid changes of their environments. Understanding how genotypes (G), environments (E) and their interaction (genotype and environment; G x E) each affects dispersal propensity is therefore instrumental for predicting the ecological and evolutionary responses of species under global change. Here we used an actively dispersing ciliate to quantify the contributions of G, E, and G x E on dispersal propensity, exposing 44...

Data from: Relative density and dispersion pattern of two southern African Asteraceae affect fecundity through heterospecific interference and mate availability, not pollinator visitation rate

Caroli De Waal, Bruce Anderson & Allan G. Ellis
1. Since co-flowering plants often share pollinators, their fecundity is likely affected by pollen transfer within and among plant species. Changes in pollinator visitation rates (e.g. through facilitation or competition for pollinators) are usually thought to exert the predominant influence on plant fecundity. However, the transfer of conspecific relative to heterospecific pollen between individuals may also play an important role. Indeed the relative importance of these determinants of fecundity is expected to depend on the...

Data from: Selfing ability and dispersal are positively related, but not affected by range position, across multiple species of southern African Asteraceae

Caroli De Waal, James G. Rodger, B. Anderson & Allan G. Ellis
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...

Data from: Ecological impacts of invasive alien species along temperature gradients: testing the role of environmental matching

Josephine C. Iacarella, Jaimie T. A. Dick, Mhairi E. Alexander & Anthony Ricciardi
Invasive alien species (IAS) can cause substantive ecological impacts, and the role of temperature in mediating these impacts may become increasingly significant in a changing climate. Habitat conditions and physiological optima offer predictive information for IAS impacts in novel environments. Here, using meta-analysis and laboratory experiments, we tested the hypothesis that the impacts of IAS in the field are inversely correlated with the difference in their ambient and optimal temperatures. A meta-analysis of 29 studies...

Data from: Evidence for shifts to faster growth strategies in the new ranges of invasive alien plants

Michelle R. Leishman, Julia Cooke & David M. Richardson
Understanding the processes underlying the transition from introduction to naturalisation and spread is an important goal of invasion ecology. Release from pests and pathogens in association with capacity for rapid growth are thought to confer an advantage for species in novel regions. We assessed leaf herbivory and leaf-level traits associated with growth strategy in the native and exotic ranges of 13 invasive plant species from 256 populations. Species were native to either the Western Cape...

Data from: Estimating the effect of plantations on pine invasions in protected areas: a case study from South Africa

Matthew M. McConnachie, Brian W. Van Wilgen, David M. Richardson, Paul J. Ferraro & Aurelia T. Forsyth
1. Protected areas (PAs) are a key intervention for conserving biodiversity and ecosystem services. A major challenge for PAs is the control of invasive non-native plants that spread into PAs from surrounding sources such as forestry plantations. The links between invasions and different source populations are poorly understood, making it difficult to apportion responsibilities for control costs. 2. We estimated the effect of plantations of invasive pines (Pinus species) on the spread of these trees...

Data from: Postglacial climate changes and rise of three ecotypes of harbor porpoises, Phocoena phocoena, in western Palearctic waters

Michaël C. Fontaine, Kathleen Roland, Isabelle Calves, Frederic Austerlitz, Friso P. Palstra, Krystal A. Tolley, Sean Ryan, Marisa Ferreira, Thierry Jauniaux, Angela Llavona, Bayram Öztürk, Ayaka A. Öztürk, Vincent Ridoux, Emer Rogan, Ursula Siebert, Marina Sequeira, Gísli A. Vikingsson, Asunción Borrell, Johan R. Michaux & Alex Aguilar
Despite no obvious barriers to gene flow in the marine realm, environmental variation and ecological specializations can lead to genetic differentiation in highly mobile predators. Here, we investigated the genetic structure of the harbor porpoise over the entire species distribution range in western Palearctic waters. Combined analyses of ten microsatellite loci and a 5,085 bases-pairs portion of the mitochondrial genome revealed the existence of three ecotypes, equally divergent at the mitochondrial genome, distributed in the...

Data from: Positive selection of deleterious alleles through interaction with a sex-ratio suppressor gene in African buffalo: a plausible new mechanism for a high frequency anomaly

Pim Van Hooft, Ben J. Greyling, Wayne M. Getz, Paul D. Van Helden, Bas J. Zwaan & Armanda D. S. Bastos
Although generally rare, deleterious alleles can become common through genetic drift, hitchhiking or reductions in selective constraints. Here we present a possible new mechanism that explains the attainment of high frequencies of deleterious alleles in the African buffalo (Syncerus caffer) population of Kruger National Park, through positive selection of these alleles that is ultimately driven by a sex-ratio suppressor. We have previously shown that one in four Kruger buffalo has a Y-chromosome profile that, despite...

Data from: Intraspecific divergence and convergence of floral tube length in specialized pollination interactions

Bruce Anderson, Petra Ros, T. J. Wiese & Allan G. Ellis
Floral tubes are often thought to be a consequence of adaptive specialization towards pollinator morphology. We explore floral tube length evolution within Tritoniopsis revoluta (Iridaceae), a species with considerable geographical tube length variation. We ask whether tube lengths of T. revoluta populations are associated with pollinator proboscis lengths, whether floral divergence occurs in the presence of different pollinators and whether floral convergence occurs between distantly related populations pollinated by the same pollinator. Finally, we ask...

Registration Year

  • 2014

Resource Types

  • Dataset


  • Stellenbosch University
  • French National Centre for Scientific Research
  • South African National Biodiversity Institute
  • University of Liège
  • University of Pretoria
  • Queen's University Belfast
  • University of Notre Dame
  • Scientific Services
  • University of Veterinary Medicine Hanover
  • Marine Research Foundation